State of Delaware 2004 Combined Watershed Assessment Report (305(b)) and Determination for the Clean Water Act Section 303(d) List of Waters Needing TMDLs
Department of Natural Resources and Environmental Control February 25, 2005 Revised August 4, 2005
State of Delaware 2004 Combined 305(b) Report and 303(d) List
Preface The State of Delaware 2004 Combined Watershed Assessment Report (305(b)) and Determination for the Clean Water Act Section 303(d) List of Waters Needing TMDLs provides a statewide assessment of surface water and ground water resources, highlights Delaware’s initiatives in water resources management and pollution control and provides a list of waters that need TMDLs to meet water quality standards. The document fulfills the reporting requirements set forth under Sections 305(b) and 303(d) of the Federal Clean water Act of 1977, as amended in 1981 and 1987, and is organized in accordance with federal Environmental Protection Agency’s (EPA) guidance documents. This document summarizes statewide water quality assessments, provides an overview of major initiatives and concerns on a statewide basis, and lists waters needing TMDLs. Tables are provided which show the result of water quality analysis and designated use support findings for data from the period of September 1998 through August 2003. There are three appendices to the report. Appendix A is the data provided by citizen monitoring programs. Appendix B contains comments and responses to the Tentative Determination for the State of Delaware 2004 Clean Water Act Section 303(d) List of Waters Needing TMDLs. Appendix C is the 2003 Nutrient Management Commission Annual Report. Assessments for the Delaware River and Bay are completed by the Delaware River Basin Commission (DRBC).
State of Delaware 2004 Combined 305(b) Report and 303(d) List
Table of Contents
Preface......
Part I: Executive Summary...... 1
Water Quality Monitoring ...... 3 Wetlands in Delaware ...... 7 Bacteria (Pathogen Indicators)...... 7 Nutrient Enrichment ...... 7 Fish Consumption Advisories...... 13 National Methylmercury Fish Consumption Advisory ...... 13 General Changes or Trends in Water Quality...... 13 Ground Water Quality...... 14 Future Needs and Activities to Improve Environmental Quality of the State ...... 14 Programs to Correct Impairments ...... 21
Part II :Background ...... 25
State Atlas...... 27 Summary of Classified Uses ...... 28 Nonpoint Source Pollution Control Program ...... 29
Part III: Surface Water Assessments and TMDL List...... 31
Chapter 1 Monitoring Programs...... 33 Chapter 2: Assessment Methodologies and Summary Data...... 45 Summary Data Tables ...... 69 Chapter 3: Rivers/Streams, Estuaries and Lakes Water Quality Assessments and List of Waters needing TMDLs ...... 77 Table III-4 Station Summary Statistics ...... 77 Table III-5: Segment Use Support ...... 117 Table III-6: 2004 303(d) List ...... 125 Chapter Four: Public Health/Aquatic Life Concerns ...... 159
Part IV Ground-Water Assessment ...... 165
IV.1 Ground-Water Assessment Overview...... 167
IV.2 Factors affecting Ground-Water Availability ...... 168
Part V: Wetlands Assessment...... 211
Introduction ...... 213 Functions and Values of Wetlands ...... 213
Appendices...... 219
2 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Part I: Executive Summary
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State of Delaware 2004 Combined 305(b) Report and 303(d) List
Executive Summary As recently as 1975, Delaware routinely experienced serious water pollution and public health problems as a result of the discharge of untreated sewage and wastes. Since then, as a result of voluntary efforts, regulatory actions, and significant private and public investments in wastewater treatment facilities, localized improvements in water quality have been achieved. The need for additional cleanup and pollution prevention continues. The focus of water quality management has shifted from point source discharges (end-of-pipe) to decreased stream flows and nonpoint source problems, such as urban and agricultural runoff, erosion, and sedimentation. Unaddressed, these problems lead to poor habitat conditions for fish and other aquatic life, decreased enjoyment of our surface waters for recreation, and unhealthy conditions for those surface waters upon which we rely for drinking water supply and other domestic uses.
Water Quality Monitoring The DNREC recognizes the need to use its personnel and financial resources efficiently and effectively. To that end, surface water quality monitoring is conducted in a manner that focuses available resources on the Whole Basin Management concept. The Whole Basin Management Program in Delaware operates on a 5-year rotating basis. This new approach enables the DNREC to comprehensively monitor and assess the condition of the State environment with due consideration to all facets of the ecosystem. Elements of the State's specific Surface Monitoring Program include: TMDL-Related Monitoring General Assessment Monitoring Toxics in Biota Monitoring Toxics in Sediment Monitoring Biological Assessment Monitoring
Delaware Rivers and Lakes Delaware has classified more than 2,509 miles of rivers and streams, and 2,954 acres of lakes and ponds that have been classified using a rating system called for in the Federal Clean Water Act. The classification system is keyed to a management program designed to protect uses of the waters (referred to as "designated uses") for such purposes as drinking water supply, recreation, and the propagation of fish, aquatic life and wildlife. These designated uses serve as Delaware's water quality goals for specific watersheds. In order to protect those uses, a comprehensive set of chemical, biological, and habitat standards have been promulgated. Designated uses and standards are embodied in the State of Delaware Surface Water Quality Standards as amended on July 11,2004. The Department of Natural Resources and Environmental Control has found that 94% of Delaware’s rivers and streams do not fully support the swimming use and 65% do not fully support the fish and wildlife use. Most of these waters do not meet the standards because of nonpoint source pollution impacts.
3 Ponds and lakes in Delaware exhibit many of the same problems as rivers and streams. However, ponds and lakes also serve as "catch basins" for a variety of pollutants that are washed from the land and the air into these water bodies. Two indicators which show the tendency for lakes and ponds to accumulate pollutants are fish consumption advisories due to toxic substances in the fish, and the extent of nutrient enrichment. Nutrient enrichment can lead to excessive weed and algae growth, reduced water clarity, and decreases in population of aquatic life and wildlife. The department has found that 68% of Delaware’s fresh water ponds and lakes do not fully support the swimming use and 24% do not fully support the fish and wildlife use.
4 100 100
80 80
60 60
40 40
20 20
0 0 use support specific with % Segments % Segments with specific use support use specific with % Segments Primary Aquatic Life Water Supply Indust. Water Primary Aquatic Life Indust. Water Secondary ERES Agricult. Water Secondary ERES Shellfish Designated Use Designated Use
Fully Supporting Partially Supporting Not Supporting Fully Supporting Partially Supporting Not Supporting
Rivers Estuaries
100 100
80 80
60 60
40 40
20 20 Percent of Use Support 0 % Segments with specific use support use specific with Segments % 0 Primary Aquatic Life Water Supply Indust. Water Primary Aquatic Life Indust. Water Secondary ERES Agricult. Water Secondary ERES Designated Use Designated Use
Fully Supporting Partially Supporting Not Supporting Fully Supporting Partially Supporting Not Supporting
Lakes Shorelines
Figure I-1 Designated Use Support for Waters of the State (2004)
State of Delaware 2004 Combined 305(b) Report and 303(d) List
Wetlands in Delaware Wetlands have many important functions and values to society. They provide fish and wildlife habitat, help maintain water quality, and provide indirect socioeconomic values such as flood and storm water damage protection. With the implementation of federally mandated regulations known as Total Maximum Daily Loads (TMDLs) to reduce pollutants into water bodies, wetland preservation is considered one of the most important strategies for achieving the pollution reduction efforts necessary to meet water quality standards. Wetlands comprise a significant portion of Delaware’s water resources covering over 300,000 acres (about 470 square miles or 23%) of the state. Throughout the state a wide diversity of wetland types occur including both tidal and nontidal wetlands. While some wetlands are directly connected or adjacent to other surface waters such as salt marshes and floodplains, others occur as isolated areas surrounded by uplands such as forested flats and Delmarva Bays. Preserving the abundance, quality, diversity and proportion of different types of wetlands in the landscape is essential to protecting the natural resources and waters of Delaware. Currently the State of Delaware is actively working in each of these areas to protect our high quality wetland resources and restore degraded systems on the watershed scale.
Bacteria (Pathogen Indicators) As the name implies, "indicator bacteria" are indicators of pathogenic (disease causing) bacteria and viruses. Sources of indicator bacteria (enterococcus and coliform) are widespread. The sources of most concern are those of human origin such as raw or inadequately treated sewage. Wildlife and animal operations such as feedlots can also be significant sources of indicator bacteria, although they represent less of a risk to human health compared to human wastes. High levels of bacteria pose an increased risk of illness to shellfish consumers, swimmers, and others who may come in contact with contaminated waters. Approximately 94% of Delaware's rivers and streams, 87% of ponds and lakes, and 59% of estuarine waters (not including the Delaware River and Bay) were found to have bacteria concentrations above the levels considered acceptable for primary contact recreation (swimming, bathing, and water skiing). Many of Delaware's estuarine and tidal waters exhibited bacteria levels above those considered safe for the harvesting and consumption of shellfish. Waters most impacted include the tidal tributaries of the Delaware Bay and portions of Delaware's Inland Bays.
Nutrient Enrichment Eutrophication of surface waters is a natural process, spanning hundreds to thousands of years, resulting from natural erosion and the breakdown of organic material. Over these extended periods many lakes and ponds under natural conditions would be expected to fill in with sediments and organic materials, eventually becoming marshes and meadows. Lakes and ponds in various stages of eutrophication are considered a natural feature of Delaware's environment. Activities linked to soil erosion, domestic waste disposal (on-site septic systems), and runoff, can greatly increase the rate and amount of nutrients reaching lakes and ponds, accelerating the eutrophication process. Characteristic symptoms of nutrient enriched water bodies include murky green waters or nuisance plant growth. Delaware waters are generally considered to be impacted
7 by nutrients (nitrogen and phosphorus). 90th percentile concentrations of total nitrogen and total phosphorus in Delaware waters are shown in figures 1-2 and 1-3.
8 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Figure 1 - 2
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State of Delaware 2004 Combined 305(b) Report and 303(d) List
Figure 1 - 3
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State of Delaware 2004 Combined 305(b) Report and 303(d) List
Fish Consumption Advisories Toxic substances such as Polychlorinated Biphenyls (PCB's), metals and pesticides persist in the environment and accumulate in the flesh of fish. The Department of Natural Resources and Environmental Control and the Department of Health and Social Services issued updated fish consumption advisories for twenty one waterbodies in the State during March of 2004. See the table in Section III, Chapter 4 and Figure III-6.
National Methylmercury Fish Consumption Advisory On January 12, 2001, EPA and the Food and Drug Administration (FDA) issued concurrent national fish consumption advisories recommending restricted consumption of freshwater coastal and marine species of fish due to methylmercury contamination. EPA’s advisory targeted women of childbearing age and children who may be consuming noncommercial freshwater fish caught by family or friends. The advisory specifically recommends that women who are pregnant or could become pregnant, women who are nursing a baby, and their young children, should limit consumption of freshwater fish caught by family and friends to one meal per week unless the state health department has different advice for the specific waters where the fish are caught. For adults, one meal is six ounces of cooked fish or eight ounces uncooked fish; for a young child, one meal is two ounces of cooked fish or three ounces of uncooked fish.
General Changes or Trends in Water Quality As a result of water quality protection programs that are in place in Delaware, surface water quality in general has remained fairly stable in spite of increasing development and population growth. Impacts to waters are generally the result of past practices or contamination events, activities that are not regulated nor otherwise managed, or changes that are occurring on a larger regional scale. For example, air pollutants from sources outside of Delaware contaminate Delaware's surface waters via rainfall. Improvements in water quality have been documented in localized areas where a discharge was eliminated or better treatment installed. Basin-wide water quality improvements in waters that are being impacted by historical contamination and nonpoint pollution sources are very difficult to detect over a short period of time. Targeted monitoring over long time periods (years) is necessary in order to detect changes. Although Delaware's surface water quality may not have changed significantly over the last several years, there have been many improvements made in watershed assessment approaches and methodologies. Additionally, many water quality criteria are stricter as a result of amendments to the State's Water Quality Standards. Therefore, we have become more proficient at identifying water quality problems and, at the same time, are calling for higher quality waters. The stability of Delaware’s surface water quality is likely the result of increased efforts to control both point and nonpoint sources of pollution. In addition to the significant investments in wastewater treatment technologies previously mentioned, many private business interests are investing in practical and cost-effective nonpoint source pollution control practices (Best Management Practices) on farms, residential developments, and commercial and industrial sites. Likewise, public agencies such as the Delaware Department of Transportation are investing
13 revenues in improved storm water management practices and wetlands creation to mitigate the impacts of maintenance and new highway construction activities.
Ground Water Quality Ground water provides an abundant, high-quality, low-cost supply of water for residents of the State of Delaware. The latest records indicate that more than 40 billion gallons of water were withdrawn in 1995 from ground water sources, a 25% increase from the 1990 withdrawal of 32 billion gallons. The domestic needs of approximately two-thirds of the State's population are met with ground water provided by both public and private wells. Most of the water used for agriculture, Delaware's largest industry, and self-supplied industrial use, is also derived from ground water sources. These figures will be updated during the next reporting cycle once the next USGS water use values have been compiled. Ground water in Delaware is a relatively vulnerable resource due to the State's shallow water table and high soil permeability. The shallow unconfined aquifer is the most vulnerable to contamination and has been made unusable in many localized areas. If ground water resources are improperly managed or inadequately protected, many of the advantages previously mentioned may be lost. Contaminants in ground water originate from anthropogenic sources such as domestic septic systems, landfills, underground storage tanks, agricultural activities, chemical spills and leaks, and many other sources and activities. As population and industrialization of the State continues the standards of purity of ground water are more frequently exceeded over larger areas of the State. The deeper confined aquifers in the State are also susceptible to contamination. This is because all but one of the confined aquifers in Delaware subcrops beneath the unconfined aquifer and all aquifers receive recharge from leakage from overlying aquifers. Consequently, contamination of the ground water in the surficial unconfined aquifer could eventually affect ground-water quality of the underlying confined aquifers. Studies in southern New Castle County have demonstrated the long-term susceptibility of these deeper aquifers where they subcrop beneath the unconfined surficial aquifer. The Department is responsible for taking appropriate action to eliminate existing ground water contamination problems and reduce the likelihood of future ground water contamination. This is being accomplished by both regulatory programs (e.g., Underground Injection Control, Underground Storage Tank, RCRA, etc.) and non-regulatory programs (e.g., Pollution Prevention, Non-point Source, etc.). In the previous three 305 (b) reports, the summaries of basin assessments for ground water were included. These included those for the Piedmont Basin, Inland Bays/Atlantic Ocean Basin, and the Chesapeake Bay Basin. DNREC is drafting the remaining basin report, namely that for the Delaware River and Bay Basin. That report should be available for inclusion in the next 305 (b) report. In addition, DNREC has begun updating the Piedmont Basin Assessment Report.
Future Needs and Activities to Improve Environmental Quality of the State The State of Delaware will continue to focus on nonpoint source pollution problems such as urban and agricultural runoff, erosion and sedimentation and ground water contamination. The Department of Natural Resources and Environmental Control will emphasize pollution prevention, education, and both voluntary and regulatory efforts to improve the quality of surface
14 State of Delaware 2004 Combined 305(b) Report and 303(d) List
and ground water resources. Additional research and assessment efforts will be necessary to better understand the response of aquatic systems to certain pollutants. Additionally, because of the relationship of stream flow to ecological health, the development of a surface water withdrawal/minimum stream flow maintenance policy is a priority. Improved assessment and management of biological health and physical habitat quality are also priorities. The health of Delaware’s aquatic systems and ground water resources will be assessed and managed within the framework of the Department of Natural Resources and Environmental Control’s Whole Basin Management Program. This program calls for the Department, in partnership with other governmental entities, private interests, and all stakeholders, to focus its resources on specific watersheds and basins (groups of watersheds) within specific time frames. Five basins and 45 watersheds have been delineated (see figure I-4 entitled “Delaware Drainage Basins and Watersheds”). The Whole Basin Management activities in the State started within the Piedmont Basin in 1996, and were followed by the Chesapeake Basin in 1997, the Inland Bays in 1998 and the Delaware Bay Drainage Basin started in 1999. Similar activities have begun for the Delaware Estuary. In addition to the planning and preliminary assessment steps, Whole Basin Management will include intensive basin monitoring, comprehensive analyses, management option evaluations, and resource protection strategy development. Public participation and ongoing implementation activities will occur throughout the Whole Basin Management process. The chart entitled “Whole Basin Management Plan Process and Timeline” details the steps and milestones.
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State of Delaware 2004 Combined 305(b) Report and 303(d) List
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State of Delaware 2004 Combined 305(b) Report and 303(d) List
Programs to Correct Impairments
State of Delaware Total Maximum Daily Load Program (TMDL) Section 303(d) of the Federal Clean Water Act (CWA) requires States to develop a list of water bodies for which existing pollution control activities are not sufficient to attain applicable water quality standards (303(d) List) and to develop Total Maximum Daily Loads (TMDLs) for pollutants of concern. A TMDL sets a limit on the amount of a pollutant that can be discharged into a waterbody such that water quality standards are met. The State of Delaware is operating under a court-approved Consent Decree to establish TMDLs for all impaired streams on the State's 1996 303(d) list by the year 2006. So far, the State has established TMDLs for the following watersheds: Appoquinimink River Watershed. The TMDL for the Appoquinimink River Watershed was established in January 1998. The Appoquinimink River TMDL requires the reduction of discharged nutrients and oxygen consuming matters from point and nonpoint sources in the watershed. Nanticoke River and Broad Creek Sub-basin. The TMDL for the Nanticoke River and Broad Creek Sub-basin was established in December 1998. The Nanticoke River and Broad Creek TMDL requires that Biological Nutrient Removal (BNR) technology be employed for wastewater treatment at four large treatment plants in the sub-basin. In addition, it requires that nonpoint sources of nutrients (nitrogen and phosphorous) be reduced by 30 to 50 percent. Indian River, Indian River Bay, and Rehoboth Bay. The TMDL for the Indian River, Indian River Bay, and Rehoboth Bay was established in December 1998. The TMDL requires the systematic elimination of all point sources of nutrients in the sub-basin. Furthermore, it requires that nonpoint sources of nutrients (nitrogen and phosphorous) be reduced by 40 to 85 percent Zinc TMDL for the White Clay Creek. The TMDL for zinc in the White Clay Creek was established in November of 1999. This TMDL specifies the maximum amount of zinc that can be released to the Creek from the now defunct NVF Newark facility. Zinc TMDL for the Red Clay Creek. The TMDL for zinc in the Red Clay Creek was established in December of 1999. This TMDL specifies the maximum amount of zinc that can be discharged to the Creek from the NVF Yorklyn facility. Christina River Sub-basin. A low-flow nutrient and dissolved oxygen TMDL was established in January 2001 for the entire Christina River sub-basin in Delaware, Pennsylvania, and Maryland. The TMDL requires the reduction of discharged nutrients and oxygen consuming matters from several point source facilities in the sub-basin. Murderkill River Watershed. A nutrient and dissolved oxygen TMDL for the Murderkill River Watershed was established in December 2001. The Murderkill River TMDL requires reduction of discharged nutrients and oxygen consuming matters from point source facilities in the watershed. In addition, it requires that nonpoint sources of nutrients (nitrogen and phosphorous) be reduced by 30 to 50 percent.
21 In addition to the above-established TMDLs, Delaware DNREC is planning to develop TMDLs for oxygen consuming compounds, nutrients, and bacteria for the remaining watersheds within the State according to the following schedule:
Year Watershed 2004 Little Assawoman Bay, the tributaries and ponds of the Indian River, Indian River Bay, and Rehoboth Bay High-flow TMDL for the Christina River sub-basin Shellpot Creek Naamans Creek 2005 Choptank River Chester River Marshyhope Creek Pocomoke River 2006 St. Jones River Broadkill River Army Creek Blackbird Cedar Creek Dragon Run Leipsic River Little River Mispillion River Red Lion Smyrna River
Pollution Control Strategies Pollution Control Strategies (PCSs) are plans to achieve the pollutant and nutrient load reductions delineated by Total Maximum Daily Loads (TMDLs). They describe the specific actions that are needed to achieve water quality standards and provide a schedule for implementing those actions. PCSs are being developed for four watersheds: Inland Bays (Rehoboth Bay, Indian River and Bay, and Little Assawoman Bay); Nanticoke River and Broad Creek; Murderkill River; and, Appoquinimink River. The PCSs, for these watersheds, are being recommended by diverse groups of citizens (including government officials) called Tributary Action Teams (TATs). These TATs work with the Department’s Whole Basin Management Teams and other experts during the process of formulating the PCSs. The Inland Bays Tributary Action Team, convened by the Center for the Inland Bays, has worked diligently in providing the Department with two sets of recommendations for their PCS. This Team, facilitated by Bill McGowan of the Cooperative Extension, and Joe Farrell, of Delaware Sea Grant, is closest to submitting a final recommended PCS. The Appoquinimink River Tributary Action Team, convened by members of the Appoquinimink School District, has also worked hard to educate their community while formulating a draft recommended PCS. The Team created a speaker's bureau that made presentations on water
22 State of Delaware 2004 Combined 305(b) Report and 303(d) List
quality for community group meetings. They currently have a monthly column in the Middletown Transcript and are close to submitting their first draft PCS. The Cooperative Extension Service convened the Nanticoke watershed’s TAT. This group of concerned residents will be striving to make their recommendations by the end of the 2002. In the Murderkill River watershed, the Division of Water Resources teamed with the Division of Parks and Recreation to convene the Murderkill TAT at Killens Pond State Park. This Team, formed in 2001, actually began its work before the promulgation of the Murderkill TMDL in December 2001. They have scheduled two public forums for 2002—one in May and another in August.
Delaware Nonpoint Source Control Program The Delaware Nonpoint Source Program administers a competitive grant made possible through Section 319 of the Clean Water Act. The grant provides funding for projects designed to reduce nonpoint source (NPS) pollution in Delaware. NPS pollution may be defined as any pollution that originates from a diffuse source (such as an open field or a road) and is transported to surface or ground waters through leaching or runoff. Reduction of NPS pollution may often be achieved through incorporation of specific best management practices (BMPs) into project workplans. Projects may target any source of NPS pollution, but most frequently involve agriculture, silviculture, construction, marinas, septic systems, and hydromodification activities. Proposals are reviewed and evaluated, and those which are determined to meet specific requirements are eligible for funding. All projects must include matching funding from a non- Federal source totaling at least 40 percent of the overall project cost. In addition to funding projects that achieve reductions in NPS pollution, the Delaware NPS Program is committed to addressing the issue through educational programs, publications, and partnerships with other organizations working to reduce NPS pollution in Delaware. More information and annual reports are available online at this url: http://www.dnrec.state.de.us/dnrec2000/Divisions/Soil/NPS/index.htm
Delaware Riparian Buffer Initiative Local, State, and Federal governments across the country have recognized the benefits of riparian buffers, including protection of water quality, preservation of flood plains, wetlands, and other important wildlife habitats. Because riparian buffers provide so many different benefits, they can be used to serve many purposes. Grassed or tree-lined buffers at the edge of farm fields trap sediment and filter pesticides and fertilizer. Buffers in urban environments slow stormwater runoff from roads and parking lots. And buffers everywhere offer food and habitat for wildlife, as well as recreational opportunities for people. The Delaware Riparian Buffer Initiative developed a Watershed level suite of tools for prioritizing areas for riparian buffers. This GIS Planning module was developed through a series of workshops and meetings taking input from Conservation Districts, NRCS, Delaware Department of Agriculture, USFWS, and DNREC staff, facilitated by the Delaware Coastal Programs. This resulted in criteria to identify Very High, High, Medium and Low Priority areas to target for riparian buffers based upon both water quality and wildlife considerations. The four main functions of this GIS Planning Module are:
23 • Identify riparian and vegetated wetland areas within a watershed that have or do not have vegetated buffers • Review the connectivity between riparian areas and plan for riparian corridors • Prioritize targeting for riparian buffers • Mapping function to a standard layout design.
Delaware Nutrient Management Commission The Nutrient Management Act established a 19-member commission that is charged to develop, review, approve, and enforce regulations governing the certification of individuals engaged in the business of land application of nutrients and the development of nutrient management plans. The members of this commission come from many different backgrounds and professions. The Delaware Nutrient Management Commission’s official mission is: “To manage those activities involving the generation and application of nutrients in order to help improve and protect the quality of Delaware’s ground and surface waters, sustain and promote a profitable agricultural community, and to help meet or exceed federally mandated water quality standards, in the interest of the overall public welfare. The mission of The Delaware Nutrient Management Commission is to: • Consider establishing critical areas for voluntary and regulatory programs. • Establish Best Management Practices to reduce nutrients in the environment. • Develop educational and awareness programs. • Consider incentive programs to redistribute nutrients. • Establish the elements and general direction of the State Nutrient Management Program. • Develop nutrient management regulations. The complete 2003 Nutrient Management Commission annual report is included as an appendix to this document.
24 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Part II :Background
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State of Delaware 2004 Combined 305(b) Report and 303(d) List
Background This report on Delaware's water quality has been prepared pursuant to the requirement set forth in the Federal Clean Water Act of 1977 and the 1981 and 1987 amendments of Section 305(b), which require each state to prepare and submit to Congress a description of the water quality of all navigable waterways within the State on a biennial basis. The information contained herein applies to the period of September 1998 through August 2003. Water quality assessments contained in this report were based on information available at the time of assessment. All basin assessments were prepared by the Delaware Department of Natural Resources and Environmental Control, Division of Water Resources.
State Atlas Table 2.1 provides a brief summary of statistics regarding population and waterbody sizes for Delaware. The waterbody sizes listed in the table were obtained from a Geographic Information System (GIS) data layer that was recently developed to index state’s stream waters with the U.S. EPA’s Reach File 3 network of streams. Table 2.1 State Atlas State Population 783,600 State Surface Area 1981 square miles Number of Basins 5 Number of Watersheds 45 Total Number of Stream and River Miles 2509 Number of Perennial River Miles 1778 Number of Intermittent Stream Miles 405 Number of Ditches and Canals 326 Number of Border Miles 87 Acres of Lakes/Reservoirs/Ponds 2954 Square Miles of Estuarine Waters 841 Number of Ocean Coastal Miles 25 Acres of Freshwater Wetlands 226,530 Acres of Tidal Wetlands 127,338 1. U.S. Census Bureau, 2000 Census of Population, Public Law 94-171 Redistricting Data File. 2. Surface area for Delaware River Zone 5 and Delaware Bay provided by the Delaware River Basin Commission (DRBC), 1994 -1995 305(b) Report. For purposes of this report, Delaware reports on the Inland Bays and DRBC reports on the Delaware River and Bay.
27 Summary of Classified Uses The State of Delaware Surface Water Quality Standards (as amended July 2004) contains the following Designated Use categories: • Public Water Supply (PS) • Industrial Water Supply (IS) • Primary Contact Recreation (PCR) • Secondary Contact Recreation (SCR) • Fish, Aquatic Life, and Wildlife (FISH,WL) • Cold Water Fish - Put and Take (CWF) • Agricultural Water Supply (AS) • Exceptional Recreational or Ecological Significance (ERES) • Harvestable Shellfish Waters (SFH) EPA recognizes that each state may have different designated use categories and definitions. In order to improve reporting consistency and interpretation of assessment information on the national level, EPA has recommended the use of the following designated use categories for reporting purposes: • Fish Consumption • Shellfishing • Aquatic Life Support • Swimming • Secondary Contact Recreation • Drinking Water Supply • Agriculture Delaware has applied EPA's categories in reporting designated use support on the following basis: • Fish Consumption is assessed based on whether a fish advisory exists for a waterbody; • Aquatic Life Support is equivalent to Delaware's Fish, Aquatic Life, and Wildlife designated use; • Shellfishing is equivalent to Delaware's Harvestable Shellfish Waters designated use; • Swimming is equivalent to Delaware's Primary Contact Recreation designated use and also includes water skiing; • Secondary Contact is equivalent to Delaware's Secondary Contact Recreation designated use and includes activities such as boating;
28 State of Delaware 2004 Combined 305(b) Report and 303(d) List
• Drinking Water Supply is equivalent to Delaware's Public Water Supply designated use; • Agriculture is equivalent to Delaware's Agricultural Water Supply designated use. For this report, the attainment of the Clean Water Act goal of fishable waters is primarily based on Aquatic Life Support and Fish Consumption. Less than full support or attainment of either the Aquatic Life Support or Fish Consumption infers that the fishable goal of the Clean Water Act is not fully supported. Less than full support of the Swimming or Primary Contact Recreation designated use infers that the swimmable goal of the Clean Water Act is not fully supported. Delaware's Exceptional Recreational or Ecological Significance (ERES) designation is applied to special State waters that are accorded a higher level of protection than other waters. Section 5 of the State of Delaware Surface Water Quality Standards (July 2004) contains specific criteria for ERES waters. All the State's waters are designated for Primary Contact Recreation and for Fish, Aquatic Life, and Wildlife purposes.
Nonpoint Source Pollution Control Program The Nonpoint Source Management Program is a dynamic and open-ended program intended to facilitate and promote statewide efforts to manage nonpoint source pollution. The following goals guide the program: • The NPS Program will support the identification and quantification of those problems that are caused specifically by nonpoint source pollution through assessment updates. • The NPS Program will be implemented and updated to realistically reduce nonpoint source pollution in a cost-effective manner. • The NPS Program will address nonpoint source pollution through a program that balances education, research, technical assistance, financial incentives, and regulation. • The NPS Program will follow a non-degradation policy in areas where surface and ground waters meet state water quality standards and a policy to realistically improve water quality in areas that do not meet these standards. • The NPS Program will continue to use the coordinated approach for implementation and maintain an open-ended framework to incorporate new initiatives. In Delaware, the lead agency for the development and implementation of the Nonpoint Source (NPS) 319 Program is the Department of Natural Resources and Environmental Control (DNREC), Division of Soil and Water Conservation. The NPS program is required to develop an annual list of Environmental Indicators and to provide yearly progress reports to EPA on the accomplishment of stated goals and objectives. Delaware's NPS Program will distribute the 1999 Annual Report in April 2000. Delaware revised the NPS Management Plan document in 1999. It was subsequently approved by EPA in November, 1999. The Management Plan provides direction for the implementation of nonpoint source initiatives for 1999 through 2004. Delaware will strive to assure effective and efficient use of financial resources by leveraging funds with other programs and by targeting NPS priority issues and areas.
29 The NPS Program Staff has developed program milestones/objectives that focus staff resources on critical issues and areas. These priority issues have been identified in the Management Plan,1999 and Assessment Report, 1995 as well as other assessment processes such as the 305(b) Report and the Whole Basin Preliminary Assessment process. The specific "Milestones for Implementation" that will guide the NPS Program staff for the next five years are as follows: Commit NPS 319 funds (20% max. allowed) to Total Maximum Daily Load (TMDL) development. Support implementation of TMDL Pollution Control Strategies in the Inland Bays and Nanticoke Watersheds. Commit NPS Staff Resources to Whole Basin Management Initiatives. Develop criteria for expanded uses of the State Revolving Fund. Implement new technologies and best management practices associated with expanded uses. Establish Environmental Indicators. Use indicators for tracking/assessing environmental improvement Provide input and technical support to DNREC water quality assessment prioritization such as the Unified Watershed Assessment List and 305(b) List. Nutrients: Agriculture - Provide technical and financial support for alternative uses of manure, distribution of manure, and on-farm conservation planning. Seek mass balance of nutrients in the state and regionally. Urban - Develop baseline data for urban Loadings Provide technical support for Conservation Reserve Enhancement Program (CREP), Confined Animal Feeding Operations (CAFOs), and the Coastal Nonpoint Source Pollution Program . Hydromodification: Agriculture - Support expanded research/implementation of Best Management Practices (BMPs) to prevent nutrient and sediment transport by agricultural drainage ways. Urban - Advance research and implementation of improved storm water management techniques to maintain the stability of streams and rivers and prevent further environmental degradation. Provide public education on the benefits of riparian corridors and the protection of existing corridors. Information and Education - Promote public outreach on NPS issues by use of the DNREC web page, Annual Report, NPS display, fact sheets, presentations and public service announcements.
30 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Part III: Surface Water Assessments and TMDL List
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State of Delaware 2004 Combined 305(b) Report and 303(d) List
Part III: Surface Water Assessments
Chapter 1 Monitoring Programs
Surface Water Monitoring Programs Water quality and biological data for Delaware's surface waters are collected under Delaware's Ambient Surface Water Quality Monitoring Program and Biological Monitoring Program within DNREC. Several active citizen monitoring programs have also been developed throughout Delaware that augment the data collected by DNREC. These programs are discussed below. The DNREC recognizes the need to use its personnel and financial resources efficiently and effectively. To that end, surface water quality monitoring is conducted in a manner that focuses available resources on the Whole Basin Management concept. The Whole Basin Management Program in Delaware operates on a 5-year rotating basis. This new approach enables the DNREC to comprehensively monitor and assess the condition of the State environment with due consideration to all facets of the ecosystem. Elements of the State's specific Surface Monitoring Program include: • TMDL-Related Monitoring • General Assessment Monitoring • Toxics in Biota Monitoring • Toxics in Sediment Monitoring • Biological Assessment Monitoring • TMDL Related Monitoring Section 303(d) of the Clean Water Act (CWA), as amended by the Water Quality Act of 1987, requires States to identify those waters within their boundaries that are water quality limited, to prioritize them, and to develop a Total Maximum Daily Load (TMDL) for pollutants of concern. A water quality limited water is a waterbody in which water quality does not meet applicable water quality standards, and/or is not expected to meet applicable standards, even after application of technology-based effluent limitations for Publicly Owned Treatment Works (POTW) and other point sources. Delaware DNREC has developed a list of water quality limited waters (303(d) List) and is planning to complete TMDLs for all segments on the 1996 list over a ten-year period. The TMDL development schedule is coordinated with the Department’s Whole Basin Management Program. The TMDL related monitoring is designed to provide the necessary information to develop, calibrate, and verify hydrodynamic and water quality models and/or to support the existing models. The Department uses the hydrodynamic and water quality models as management tools for establishing total maximum daily loads; for allocating loads between point and nonpoint
33 sources of pollutants; and for monitoring progress toward achieving water quality goals and standards.
General Assessment Monitoring The General Assessment Monitoring Network (GAMN) provides for routine water quality monitoring of surface waters throughout Delaware. Each station is monitored for conventional parameters such as nutrients, bacteria, dissolved oxygen, pH, alkalinity, hardness, and metals. The data from this monitoring is entered into the EPA's STORET database, is reviewed and then analyzed in assessing the water quality condition of each water body system. Figure III-1 is a map of active STORET stations used for this report.
34 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Figure 3 - 1
35
State of Delaware 2004 Combined 305(b) Report and 303(d) List
Annual Toxics in Biota Monitoring The Annual Toxics in Biota Monitoring provides for screening level surveys and intensive surveys for toxic contaminants in fish/shellfish. Provision is also made to revisit waters where fish consumption advisories have been issued in the past to determine if contaminant levels in fish are increasing or decreasing over time. Intensive surveys are planned and conducted in areas where contamination has been detected in screening level surveys.
Toxics in Sediment Monitoring The purpose of the Toxics in Sediment program is to obtain baseline information regarding the levels of various toxics in the sediments of waters throughout the State. The program is designed to complement the Annual Toxics in Biota Monitoring.
Biological Assessment Monitoring The assessment of the quality of surface waters utilizes a multi disciplinary approach involving physical, chemical, and biological measures. The biological monitoring program is a major tool used by the Department to assess the conditions of surface waters. It includes the assessment of indigenous biological communities and physical habitats of streams, ponds, estuaries and wetlands. The goal of the program is to establish numeric biological criteria in State water quality standards to complement both existing chemical criteria and other assessments focused on fish tissue monitoring and bioassay testing. Standard methods have been developed and tested for assessing the biological community and habitat quality of nontidal streams, and draft numeric criteria are under development. Efforts over the next few years will focus on the development of methods for assessing estuaries and ponds and for assessing the quality and quantity of wetlands
Coordination/Collaboration
Delaware Center for the Inland Bays The Delaware Center for the Inland Bays was established as a nonprofit organization in 1994 under the Inland Bays Watershed Enhancement Act (Chapter 76 or Del. C. S7603). The mission of the Center for the Inland Bays is to oversee the implementation of the Inland Bays Comprehensive Conservation and Management Plan and to facilitate a long-term approach for the wise use and enhancement of the Inland Bays watershed by conducting public outreach and education, developing and implementing conservation projects, and establishing a long-term process for the preservation of the Inland Bays watershed. The goals of the Center for the Inland Bays are: To sponsor and support educational activities, restoration efforts, and land acquisition programs that lead to the present and future preservation and enhancement of the Inland Bays watershed. To build, maintain, and foster the partnership among the general public; the private sector; and local, state, and federal governments, which is essential for establishing and sustaining policy, programs, and the political will to preserve and restore the resources of the Inland Bays watershed.
37 To serve as a neutral forum where Inland Bays watershed issues may be analyzed and considered for the purposes of providing responsible officials and the public with a basis for making informed decisions concerning the management of the resources of the Inland Bays watershed. The establishment of the Center was the culmination of more than 20 years of active public participation and investigation into the decline of the Inland Bays and the remedies for the restoration and preservation of the watershed. A key element of this progression was the publication of a Decisions for Delaware: Sea Grant Looks at the Inland Bays (1983) and the participation by Sea Grant researchers and outreach personnel in the problem-solving process. The last six years of this work were accomplished as part of the National Estuary Program. The National Estuary Program, established under the Clean Water Act and administered by the U.S. Environmental Protection Agency (EPA), provided approximately $2 million to study the Inland Bays, characterize and set priorities for addressing the environmental problems in the watershed, and develop a Comprehensive Conservation and Management Plan (CCMP) to protect and restore the bays. The underlying theme of the program is that a collaborative, consensus-building effort involving citizens; private interests; organized groups; and federal, state, and local governments is essential to the successful development and implementation of the CCMP. Recently completed through a highly successful participatory effort, the Inland Bays CCMP has now been approved by Governor Thomas Carper and the EPA. Funding is provided by the EPA, the State of Delaware and private donations.
Delaware Nature Society During its 38-year history, the Delaware Nature Society has established itself within the state and region as a key provider of natural history information and a reasoned voice on environmental issues. With natural resource education as a central focus, the Nature Society offers educational programs and materials relevant to local, regional, and national issues, for all age groups and audiences. Each year, the Society makes 74,000 contacts through its members, school, and public programs. The natural resource protection and preservation activities of the Delaware Nature Society are furthered through its cooperative relationship with the Delaware Department of Natural Resources and Environmental Control (DNREC), various public agencies, and private industry. Although all Delaware Nature Society programs are designed to encourage environmental stewardship, our Watershed Stewardship programs, which include Stream Adoption, Technical Monitoring, Backyard Habitat, and Soil Stewardship, engage citizens statewide in water resources protection. Stream Adoption Stream Adoption educates individuals, families, scout and school groups about stream ecology, the threats to stream health, and their individual role in protecting water quality. Introductory training workshops provide a hands-on stream monitoring experience through the use of three survey methods. Workshop participants then have the opportunity to utilize these skills by adopting a stream, monitoring it on a regular basis, and submitting data sheets to the Nature Society and DNREC. In 2002, Nature Society staff provided 22 workshops and presentations reaching 471 individuals. Currently, 70 stream segments are “adopted” in 19 watersheds statewide. The Nature Society
38 State of Delaware 2004 Combined 305(b) Report and 303(d) List offers Stream Adopters one-on-one technical assistance and support through our statewide Watershed Team Leader volunteer corps. Volunteers logged 459 hours last year through the Stream Adoption program. Technical Monitoring The Nature Society’s Technical Monitoring program is recognized as a national example of the acceptance and use of volunteer data by the State and the Environmental Protection Agency (EPA). Technical Monitoring was developed to supplement the State’s monitoring efforts in other locations by providing reliable baseline values for several different chemical and physical parameters. The monthly sampling frequency, strategic site selection, and rigorous quality assurance and control measures allow for more subtle trend analysis. Parameters that are being monitored include visual appearance, depth, temperature, pH, dissolved oxygen, nitrates, phosphates, alkalinity, conductivity and flow. Technical Monitoring data has been collected at 30 locations within the Christina River Basin since 1995. This data is currently being incorporated into a non-point source pollution water quality model used by DNREC and the US Geological Survey for the Delaware – Pennsylvania Total Maximum Daily Load (TMDL) effort for the Upper Christina Watershed. In addition, the data has been published in the Nature Society’s State of the Christina Basin Watershed reports available online at www.delawarenaturesociety.org. In 2002, Technical Monitoring volunteers logged 498 hours. By leveraging $25,000 over the next five years, the Nature Society is expanding the Technical Monitoring program to the Mispillion Watershed. In cooperation with DNREC, five monitoring locations have been established to provide supplementary data for the 2005 Mispillion TMDL effort. To date, volunteers have been trained for three sites, including a Milford High School science class. Backyard Habitat Backyard Habitat, launched in September 2001, allows individuals to certify their properties or residences as Backyard Habitat sites if they provide food, cover, water, and places for wildlife to raise their young on the property. By adopting practices beneficial to wildlife such as landscaping with native plants and limiting use of pesticides, participants help to improve local water quality by reducing their reliance on products that contribute to non-point source pollution. The Nature Society offers homeowners interested in Backyard Habitat certification free, one-on- one technical assistance through our trained Habitat Stewards volunteer corps. To date, the Nature Society has certified 62 properties, comprising approximately 70 acres ranging from urban to suburban reserve across all three Delaware counties. Of these 62 certified properties, 32 homeowners have indicated the complete elimination of all chemical pesticides, 17 represent riparian landowners who have allowed vegetated buffers to grow on their property, and 51 individuals have directed their downspouts away from impervious areas to reduce stormwater runoff. Soil Stewardship Since 1998, the Delaware Nature Society has partnered with developers and homebuilders through the Soil Stewardship Agreement, a voluntary partnership to help reduce sediment pollution during site construction. The Agreement was developed in cooperation with several
39 public agency partners and has received official endorsement from DNREC, the Delaware Department of Transportation, and New Castle County. This year, 8 developers registered 10 sites under the Soil Stewardship Agreement. These sites include high-density residential developments and custom home sites, representing 343 building units. Following up on his pledge to enroll appropriate DelDOT projects in Soil Stewardship, Secretary Hayward directed his agency to include 2 key DelDOT projects in the program this year. Nature Society staff provided weekly erosion and sediment control inspections for Rt. 202/141 Blue Ball Properties Phase I and the reconfiguration of the Rt. 100/141 intersection, leading up to the Tyler McConnell bridge construction.
Becks Pond Work Group Becks Pond is one of only two public ponds located in heavily-populated New Castle County. The pond is owned by the Delaware Division of Fish & Wildlife, DNREC, but leased to New Castle County’s Community Services Section (NCC). The location of this pond, within an hour’s drive of 75% of the State’s population, has resulted in heavy use of the pond by anglers (Martin and Whitmore 2000); Becks Pond has been the most heavily-fished pond in Delaware on an area basis (642 angler trips per acre). Heavy development has occurred in the watershed, much of it prior to the Delaware Stormwater Management Act of 1991, resulting in an increase in urbanized land-use from 17% in 1981 (Ritter) to 38.3% by 1994 (Duffield Associates). Historically, management by the Division of Fish & Wildlife (DFW) has focused on maintaining the pond fish populations to support the heavy demand for recreational angling opportunities. Warmwater fishes such as largemouth bass, black crappie, bluegill, and chain pickerel supported the sport fishery, with the largemouth bass being the primary target. Active management, initiated with the promulgation of restricted bag and size limits in 1984, resulted in substantial recovery of the fish populations. However, poor water quality has limited improvements to the sport fishery and impacted other water-based recreational activities. A County park was established adjacent to the pond during the early 1970s to provide swimming and picnicking areas, in addition to fishing and boating activities. Total attendance for the swimming area exceeded 10,000 in 1987 (Duffield Associates 1994). However, high levels of Enterococcus bacteria and poor water clarity resulted in the periodic closures of the swimming area. The closure became permanent by 1990, so use of the pond by non-anglers has declined (Duffield Associates 1994). The DFW considered this heavily-fished pond to be a high priority and initiated the formation of a Becks Pond Work Group in March, 2000 to summarize available data, determine data gaps, obtain needed information, and formalize a work plan for the Pond. The Group consists of state, federal, and county agencies in addition to anglers and shoreline residents. Activities undertaken since 2001 included: Collection of data on summer bacteriological levels for a decision about the future possibility of swimming in the pond. Measurements of stormwater inputs (total suspended solids, BOD, and CBOD) from Belltown Run and two branches of Salem Run. Deployment of remote dataloggers to sample mid-depth water quality parameters (DO, pH, temperature) at two sites in the pond for analysis of the diurnal DO pattern.
40 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Bathymetric survey of the lower third of the pond to determine the volume of soft sediments. The major findings of the Work Group to date are: The presence of an anoxic area that occurs in the lower portion of Becks Pond during the summer months is not due to algal activity. It is driven by sediment oxygen demand due to historical deposition of organic material. Counts of Enterococcus bacteria remain above the standard for primary contact recreation at some times. Historical and current turbidity levels in the pond are a result of silt deposited in the pond that becomes resuspended following storm events. A fish consumption advisory for all finfish harvested from the pond was posted in 1999. The contaminants of concern were PCBs and mercury. Discussions within the Work Group have suggested some corrective measures to be taken for the improvement the water quality within this pond. The approach should be two-pronged, to include limiting the continued input of sediment with its associated bacteria and nutrients, and devising a strategy to remove or inactivate the accumulated soft sediment within the pond. An Action Plan is currently being developed. Improvements of facilities in and around the pond as a result of the formation of this Work Group have included: Replacement of old dam boards to allow the water to reach historical levels. Replacement of the boat ramp. Construction of two gazebos for use by park visitors. Development of an emergency water adjustment plan between the DFW and NCC for a proactive response to the threat of major storm events. Development of a better working relationship among the various governmental agencies and community users of the pond. The lower parking lot was repaved and a bio-swale installed to collect road run-off. A concrete curb was constructed along the edge of the parking area between the boat ramp and dam to direct run-off away from the pond.
Literature Cited: Duffield Associates. 1994. Phase I diagnostic/ feasibility study for Becks Pond. EPA Region III, Philadelphia. EPA Grant s-003588-01-1. Martin, C.C. and W. H. Whitmore. 2000. Survey of Delaware fishing activity by licensed anglers during 1998. Annual Report Federal Aid in Fisheries Restoration Project F-41-R-11. Delaware Division of Fish and Wildlife, Dover.
41 Ritter, W. F. 1981. Survey and classification of Delaware’s public lakes. Report Prepared for the Division of Fish and Wildlife, DE Department of Natural Resources and Environmental Control, Dover. Citizen’s Monitoring Programs in Delaware
Citizens Monitoring Programs in Delaware In recent years, many citizens' groups have been formed nationwide in response to the growing concerns about degraded water quality. Delaware was one of the first states to initiate citizens' water quality monitoring program of streams to augment fixed monitoring by state agencies. The involvement of citizens in collecting data and making observations on their streams results in an educated public with an appreciation for their watersheds and awareness of pollution threats to vital resources. Data and observations collected by citizens with a strong sense of environmental stewardship will contribute to the long-term success of environmental strategies. Delaware has four programs that use citizens to monitor water quality. The Delaware Nature Society in cooperation with DNREC established Delaware Stream Watch in 1985. The Inland Bays Citizen Monitoring program was established in 1990 as part of the Inland Bays Estuary Program. Concerned citizens of the City of Seaford in cooperation with DNREC founded the Nanticoke Citizen Monitoring Program in 1991. The Adopt A Wetland Program initiated in May 1993 by the Division of Water Resources and later transferred to the division of Fish and Wildlife.
Inland Bays Citizen Monitoring Program The Inland Bays Citizen Monitoring Program is managed by the University of Delaware Sea Grant Marine Advisory Service (SGMAS) through an MOU with DNREC, Division of Water Resources. The progam was established in 1991. The goals of the Inland Bays Citizen Monitoring Program are: 1) to collect verifiable water quality data to be used to support public policy decisions with regard to the management of the Inland Bays and 2) to increase public awareness and support for the protection and management of these aquatic resources through public participation. About 30 citizen monitors make observations at 25 sites encompassing the Inland Bays watershed, evaluating dissolved oxygen, surface water and air temperature, salinity, secchi depth and water depth. Additional site observations include weather, tides and the abundance of macroalgae in near-shore waters. Volunteers collect samples on a weekly basis from mid-April to mid-October, and every two weeks otherwise, if weather permits. Rainfall data are collected daily at three designated locations in the watershed. Volunteers complete data collection sheets and send them to SGMAS for data entry. Volunteer data are reviewed for errors and entered by the field coordinator into a Microsoft Excel spreadsheet on a microcomputer. Twice a month, volunteers collect water samples from 17 sites that are transferred to College of Marine Studies (CMS) laboratories for analysis of dissolved inorganic nitrogen (nitrate, nitrite and ammonium), dissolved inorganic phosphorous (orthophosphate), chlorophyll a, and total suspended solids using standard laboratory methods. Six times from April through October, volunteers collect water samples from six sites that are transferred to the DNREC Shellfish Program for analysis of fecal coliform bacteria.
42 State of Delaware 2004 Combined 305(b) Report and 303(d) List
The sampling methodology used in this program has been approved by the U.S. Environmental Protection Agency and has been published under the title Quality Assurance Project Plan for the Inland Bays Citizen Monitoring Project. Quality Assurance is maintained by holding group Quality Assurance/Quality Control (QA/QC) sessions at six month intervals. Sessions are conducted as needed for individual volunteers. The Citizen Monitoring Program has been successful at forging partnerships with data users, most notably State and local governments. The data is an integrated component of the Inland Bays Monitoring Plan. Citizen data has 1) supported the siting of submerged aquatic vegetation test plots, and 2) has been utilized in the Hydrodynamic and Water Quality model used to calculate Total Maximum Daily Loads (TMDL), or to predict tidal flushing from a proposed artificial inlet. Volunteers have participated in several cooperative mini-projects in which the data they collected was used to support research conclusions made by DNREC and CMS scientists. Citizen concern about pathogens in the water and adverse health effects prompted the addition of fecal coliform testing in 1992. The data has been used to support the opening of shellfish beds in the Inland Bays. Citizen monitors have also been involved in monitoring the growth and survival of clams and oysters to support the development of a shellfish management plan. Community concern about water quality in the canal systems of South Bethany prompted the town council to initiate a community-based study in 1995 to support the development of a stormwater management plan. Project benefits include 1) improved understanding of water quality dynamics, 2) sense of “ownership” of the study by the community and interest in improving water quality through better management practices, 3) cooperation among resource agencies and community leading to trust and ongoing relationships. The Sea Grant Program Manager provides oversight and coordination of the Program. A field coordinator is employed on a one-half time basis. The management team is responsible for data management and analysis, public education, quality assurance, volunteer recruitment, management and training of volunteers, daily operations of the project, conducting training sessions and field workshops, writing summary reports, and writing grant proposals to support additional mini-projects. Funding for the project is through a line-item in the DNREC budget. CMS provides office, laboratory and classroom space, laboratory equipment and technical support. DNREC provides technical advisors for program initiatives, and assistance with training and field sessions. The annual budget is approximately $37,000.
Data Interpretation and Communication Delaware has converted its older Waterbody System (WBS) database to the new EPA provided Assessment Database (ADB). The ADB is a Microsoft Access© database that generated the summary Use Assessment tables in this report. Over the last several years, the Department has been using internal resources and an EPA contractor to georeference waters of the State. The Department uses the resultant products to provide data and information to its constituents.
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State of Delaware 2004 Combined 305(b) Report and 303(d) List
Chapter 2: Assessment Methodologies and Summary Data
2004 Assessment, Listing and Reporting Methodologies Pursuant to Sections 303(d) and 305(b) of the Clean Water Act
General Provisions All readily available data and information for the period of September 1, 1998 through August 31, 2003 will be considered for the assessment of most designated uses. For waters of Exceptional Recreational or Ecological Significance (ERES), data from calendar years 1993- 2002 years will be assessed for trends. Given that adequate water quality data may not be available in all cases, determinations of use attainment will be made with an abundance of caution.
Data Quality and Quantity For parameters with seasonal regulatory values, only data from the period of interest will be used. For example, dissolved oxygen is regulated based on June to September averages; Therefore, only data collected from June to September during the period September 1, 1998 through August 31, 2003 will be considered against the criterion. Data from the Department of Natural Resources and Environmental Control’s (DNREC’s) Environmental Laboratory Section (ELS) will be considered for use if it is collected and analyzed in accordance with the DNREC ELS Quality Assurance Project Plan. For data from sources other than the DNREC ELS, the Department will consider the quality controls used in collection and analysis to determine if it will be appropriate for use in this assessment. Data will be considered readily available if it is in an electronic format that can be imported into or exported from a modern spreadsheet or database program like Microsoft Excel, Access or Quattro Pro. Data that is only available on paper will be considered on a case by case basis given the limited resources available to the Department to convert such data to the more usable electronic format. The Department routinely collects water quality samples at over 200 stations throughout the State, generally four times per year in the March to October time period. That data makes up the bulk of the data available for use in 305(b) assessments. The Department considers data from the most recent five-year period, thus, at each station, there are usually data from 20 sampling dates. Some stations are in place for a more limited time period and have smaller data sets. Other readily available data and reports are requested in advance of each assessment from parties outside of the Department and used when they are made available. In addition to electronic mail requests from specific organizations, a notice will be published in the Delaware State News and the News Journal. For the 2004 assessment, the Department will consider data and information received on or before January 2, 2004 from the following sources: Reports prepared in 2002 to satisfy Clean Water Act (CWA) Sections 305(b), 303(d) and 314 and any updates;
45 The most recent Section 319(a) nonpoint source assessment; Reports of ambient water quality data including State ambient water quality monitoring programs, citizen volunteer monitoring programs, complaint investigations, and other readily available data sources (e.g., EPA’s Storage and Retreival System (STORET), the United States Geological Survey, and research reports), and data and information provided by the public; Reports relative to dilution calculations or predictive models; Water quality management plans; Superfund Records of Decision; and Safe Drinking Water Act source water assessments. Fish and shellfish advisories Restrictions on water sports or recreational contact
Coordination with Delaware River Basin Commission (DRBC) The DRBC does 305(b) assessments every two years for the Delaware River and Delaware Bay. Delaware will incorporate the most recent use attainment determinations made by DRBC for the shared waters of the Delaware River and Delaware Bay into its 2004 303(d) list. Delaware expects to work cooperatively with the DRBC, member states and stakeholders to develop and implement TMDLs in waters of the River and Bay that the DRBC determines to be impaired.
Use of Environmental Protection Agency Integrated Assessment Guidance On July 21, 2003, the EPA published “Guidance for 2004 Assessment, Listing and Reporting Requirements Pursuant to Sections 303(d) and 305(b) of the Clean Water Act.” The guidance is available on the internet at this URL: http://www.epa.gov/owow/tmdl/tmdl0103/text.html. The core recommendation of the guidance is to categorize all waters of the state according to the following five categories: Category 1: All designated uses are met; Category 2: Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met; Category 3: Insufficient data to determine whether any designated uses are met. Either no data is available or some data is available, but it is insufficient to make a determination Category 4: Water is impaired or threatened but a TMDL is not needed; 4A: All TMDLs for this segment have been completed and EPA approved. Class 4A waters have all necessary TMDLs approved, but one or more impairments exist, despite the approved TMDLs. 4B: Other required control measures are expected to result in the attainment of WQSs in a reasonable period of time 4C: The impairment or threat is not caused by a pollutant Category 5: Water is impaired or threatened and a TMDL is needed for at least one pollutant or stressor
46 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Each of Delaware’s segments and uses will be assigned to the appropriate category and then ‘rolled up’ into a final categorization for the segment. For the final categorization, the highest category number from the applicable use determinations will be assigned to each segment. For example, if a hypothetical segment has a Category 1 determination for aquatic life use support based on average dissolved oxygen, a Category 3 determination for primary contact use, and a Category 5 determination for aquatic life use support based on the dissolved oxygen minimum criteria, then the segment would be given an overall categorization of category 5. In this case, DNREC would pursue the collection of additional enterococcus data in order to assess the primary contact use and establish a schedule for developing a TMDL in order to meet the minimum dissolved oxygen criteria. Dissolved Oxygen (DO) Aquatic Life Use Support (ALUS) The following three types of DO data are potentially available for analysis: Grab samples analyzed using the Winkler Method; Field measurements taken by personnel using handheld DO probes; and Continuous monitoring data collected using multiparameter monitoring systems that are typically deployed for one to two weeks before data is uploaded. In order to get a more accurate picture of dissolved oxygen and other water quality parameters, the Department continues to increase its use of continuous monitoring equipment. To determine ALUS with regard to Dissolved Oxygen (DO), the following methodology will be used to compare measured DO concentrations to two different standards, the minimum at all times and growing season daily average concentrations. Note that average criteria are for June to September, the minimum is a year round criterion. Except for the Lewes-Rehoboth Canal, average DO concentrations are considered to be met if less than 10% of the data indicate average DO levels below the criteria of 5.0 mg/l for marine waters and 5.5 mg/l for fresh waters. Except for the Lewes-Rehoboth Canal, the statewide minimum DO concentration for surface waters is 4.0 mg/l at any time. Stations are judged to be in compliance with this criterion if the minimum is not violated by more than 1% of continuous monitoring data and no more than two station daily averages are below the minimum. Lewes-Rehoboth Canal data is assessed against the June to September 3.0 mg/l average and 2.0 mg/l minimum at any time. Assessment of Average DO Criteria Attainment: If sampling events occurred on at least ten different days during the period September 1, 1998 through August 31, 2003 for each station, attainment of the DO average criteria will be assessed using the method that follows. Stations with fewer than ten different sampling days will be considered to have insufficient data. For purposes of DO compliance with the seasonal daily average in a segment, available continuous monitoring data will first be averaged on a daily basis for each station. Each continuous monitoring daily average will be averaged with other DO data that might be available for that day at each station. If no continuous data is available, then the average of grab sample data and field measurements (as available) will be computed for each station for each day. Any type of sample (continuous, grab or field measurement) will be considered to be representative for that station at the time of collection. Once the daily average for each station (station daily average, SDA) has been determined, the SDAs for each station will be pooled and the upper
47 confidence limit (UCL) of the nonparametric 10th percentile confidence interval will be determined using methods described in Section 3.7 of Helsel and Hirsch . That UCL will be compared to the applicable standard. If the UCL is above the applicable average criteria for all stations in a segment, the segment will be considered to be fully supporting (Category 1) for the DO average portion of ALUS. If the UCL from any station in a segment is below the applicable average, the segment will be considered not fully supportive of the aquatic life use (Category 5) Formally stated, the following hypotheses will be tested: H0: at the 90% Confidence level, X10 ≥ Standard H1: at the 90% Confidence level, X10 < Standard Where X10= Non parametric estimate of the 10th percentile of available data. Assessment of Minimum DO Criteria Attainment: Attainment of the DO minimum criteria will be assessed based on all available data (note that ten samples in 5 years are not needed for the comparison to the minimum). For stations for which no continuous DO monitoring data are available, two or more SDAs in five years below the applicable minimum will be sufficient evidence to show that the aquatic life use is not supported (Category 5). To determine if the minimum criterion has been attained, available continuous monitoring data from June 1st to September 30th of each calendar year will be pooled on an annual basis for each station. The UCL of the first percentile of the data will be calculated and compared to the minimum criteria in the same manner as the average comparison above for each year of the applicable five previous years. One or more years in which the upper confidence limit of the first percentile is below the minimum will be sufficient to determine that aquatic life use is not fully supported in the segment (Category 5). See the flow chart below for a graphical depiction of the dissolved oxygen assessment process.
48 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Nutrient Enrichment Assessment From an areal perspective, nutrient overenrichment is the leading cause of water quality impairment in Delaware. While nutrients are essential to the health of aquatic ecosystems, excessive nutrient loadings to surface water can lead to an undesirable proliferation of aquatic weeds and algae, which in turn can result in oxygen depletion and associated impacts to fish and macroinvertebrate populations. Excessive aquatic plant growth can also preclude or seriously curtail water dependent activities such as fishing and boating when plant densities become so great that uses are not physically possible. For tidal portions of the Indian River, Rehoboth Bay and Little Assawoman Bay watersheds, the water quality criterion for dissolved inorganic nitrogen is a seasonal average of 0.14 mg/l as N, and for dissolved inorganic phosphorus a seasonal average of 0.01 mg/l. For those stations where sampling events occurred on at least ten different days during the period September 1, 1998 through August 31, 2003, the lower confidence limit (LCL) of the nonparametric estimate of the tenth percentile of the available data for each station will be compared to the above values to assess attainment of desired nutrient levels in these waters. Segments with one or more stations whose LCL is above the criteria will be considered to be not fully supporting the aquatic life use (Category 5). For the remaining waters of the State, the Department has been using total nitrogen and total phosphorus levels listed in the chart below to make ALUS decisions. These target values were developed in order to implement the narrative provisions in the Surface Water Quality Standards. For those stations with sampling events on at least ten different days during the five-year assessment period, the LCL of the nonparametric estimate of the tenth percentile of the available data for each station will be compared to the moderate values shown in the table below. Segments with one or more stations whose LCL is at or above the “moderate” values listed below will be considered to be not fully supporting the aquatic life use (Category 5). Formally stated, the following hypotheses will be tested: H0: at the 90% Confidence level, X90 ≤ Minimum Moderate Value H1: at the 90% Confidence level, X90 > Minimum Moderate Value Where X90= Non parametric estimate of the 90th percentile of available data Categories of Nutrient Concentrations Nutrient Total Nitrogen Total Phosphorus Chlorophyll-a Range (mg/l) (mg/l) (ug/l) Low < 1.0 < 0.05 < 10 Moderate 1.0 - 3.0 0.05 - 0.10 10 – 50 High > 3.0 > 0.10 > 50
49 The following conditions will also result in segments being listed in Category 5: There were documented cases of nuisance algal blooms or excessive macrophyte growth. These cases violate Section 4.1 (a)(iii) of Delaware’s Standards which require waters of the State to be free from substances that may result in a dominance of nuisance species; Detailed, site-specific monitoring studies indicated a strong linkage between nutrient levels and indicators of eutrophication such as high chlorophyll-a concentrations, extreme daily variation in dissolved oxygen levels, and high sediment oxygen demand; or For ERES waters, a long-term trend analysis indicates a statistically significant increase in nutrient levels over time. Such increases are inconsistent with the short-term goal of “holding the line” on water quality in ERES waters. Such increases are also inconsistent with the long- term goal of restoring those waters, to the extent feasible, to their natural state.
50 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Assessment of Aquatic Life Use Support Using Biology and Habitat Data Delaware’s 2004 Section 303(d) List will use biological and physical habitat to assess aquatic life use attainment. The data analyses performed for the 2004 Watershed Assessment Report incorporate the results of biology and physical habitat assessments conducted at 332 nontidal stream sites in Delaware from 1991 to 1996 and other more recent assessments. The biology and physical habitat assessments document extensive degradation in Delaware’s nontidal streams. The approach for listing waters on Delaware’s 2004 303(d) list considers both biological data and physical habitat data as indicators of impairment. Whether a segment is classified as fully, partially, or not supporting aquatic life uses based on the habitat and biological data depends on the degree to which conditions at a sampled location deviate from a “reference” condition, where the “reference” condition represents the least disturbed ecological condition. The thresholds that were used to separate the various use support categories are presented in Tables 1 and 2. Table 1. Thresholds for Biological Degradation Fully Supporting 68 - 100% of Reference Partially Supporting 34 - 67% of Reference Not Supporting 0 - 33% of Reference Table 2. Thresholds for Physical Habitat Degradation Fully Supporting 89 - 100% of Reference Partially Supporting 60 - 88% of Reference Not Supporting 0 - 59% of Reference The technical basis for these thresholds and the procedures used to list waters based upon biological and physical habitat data are contained in the EPA document entitled “The Use of Existing and Readily Available Biological and Habitat Data for Listing Waters on the 1998 303(d) List” dated December 22, 1997 Segments that show biological or habitat data to be “partially supporting” or “not supporting” for aquatic life will be listed under category 5. Segments impaired for either biology, or biology and habitat, with information that demonstrates the cause is a pollutant will be put in Category 5 for that pollutant. Assessment of Aquatic Life Use Support Using Site-Specific Data That Results from Environmental Assessments and Other Programs In the normal course of business, the Department requests, receives and evaluates water quality data for various environmental programs. Similar data may also come from other parties (e.g., State, Federal, or local agencies). The Department will use those site-specific studies to compare water quality data to the applicable water quality standard(s) and make assessment and listing decisions for the affected segments. If the data show no water quality criteria are exceeded and no uses are impaired, no further listing action will be taken. If the data are ambiguous or inconclusive, the segment will be listed in Category 3. If water quality criteria are exceeded or uses are impaired as a result of a contaminated site, and the owners of the site are making substantial progress (as determined by the Department) toward correcting the pollution problem,
51 the segment will be listed in Category 4. If it appears that there is a water quality problem related to a contaminated site, and that substantial progress is not likely in the near future, the segment will be listed in Category 5. Assessment of Waters of Exceptional Recreational or Ecological Significance ERES is a special use designation in Delaware’s Surface Water Quality Standards that applies to waters deemed to be of Exceptional Recreational or Ecological Significance. The short-term goal for ERES waters is to “hold the line” on pollution and the long-term goal is to restore ERES waters, to the maximum extent practicable, to their natural condition. The ERES designated use will be assessed using data from the period January 1, 1993 through December 31, 2003 for dissolved oxygen and total nitrogen concentrations to assess trends for those parameters. Seasonality for each parameter at each station will be determined using the Kruskal-Wallis test at the 5% significance level. Parameters showing no seasonality will be assessed using Sen’s slope estimator with an Alpha of .05. Parameters showing seasonality will be evaluated using seasonal Kendall slope estimations at the 95% confidence level. Segments with one or more stations that show statistically significant decreases in dissolved oxygen levels or increases in total nitrogen or total phosphorus levels will be considered to not be in attainment of the ERES designated use. Primary and Contact Recreation Use Assessments Generally, total enterococcus bacteria water quality samples are collected four times each year from March to October at each station. For all guarded beaches and many unguarded beaches, samples are collected much more frequently from mid-May through mid-September as part of beach monitoring activities. Assessment of the two situations for primary contact recreation use support will be as follows. For segments with no beach monitoring, if sampling events occurred on at least ten different days during the five-year assessment period, then the lower confidence limit (LCL) of the nonparametric estimate of the tenth percentile of the available data for each station will be compared to the single sample maximum values shown in the table below. The single sample maximums are statistically valid interpretations of the geometric mean standards that are based on five samples in 30 days. (see EPA document EPA440/5-84-002, Ambient Water Quality Criteria for Bacteria – 1986) Stations with fewer than ten different sampling days will be considered to have insufficient data (Category 3) to make a determination if the single sample maximum implementation of the geometric mean criterion is met. Segments with one or more station LCLs above the values in the table will be considered to not be in support of the appropriate designated uses (Category 5).
52 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Water Type Single Sample Maximum for Primary Contact Use Fresh 185 Marine 35 Segments with beaches that are closed as a result of poor bacterial water quality data two or more times in a single calendar year will be considered not to support the primary contact designated use (Category 5). Some beaches are routinely closed after rain events without using water quality data to make the decision. These rainfall-based management plans are developed by statistically analyzing the relationship between rainfall amounts and Enterococcus levels. Regression analyses are used to determine the amount of rainfall that will cause exceedances of criteria. However, since the existing management plans are based upon outdated criteria, rainfall-based closures will not be considered. Occasionally, the Department may conduct special studies with more frequent sampling events that are not part of a beach monitoring program. In cases where five or more samples were collected within 30 days for part of the five–year assessment period as a result of a special intensive study and for the rest of the period there is only sufficient data for the comparison to the single sample maximum values, the Department will use best professional judgment to arrive at an assessment for that segment for the primary contact recreation use. Formally stated, the following hypotheses will be tested: H0: at the 90% Confidence level, X90 ≤ Single Sample Maximum Value H1: at the 90% Confidence level, X90 > Single Sample Maximum Value Where X90= Non parametric estimate of the 90th percentile of available data Listing Criteria for Waters with Fish Consumption Advisories For purposes of developing Delaware’s Integrated 305(b) Report and 303(d) List, the issuance of a “no consumption” or “limited consumption” fish advisory will be interpreted as a violation of Section 9.2(c) and Section 4.1(a)(iii) of Delaware’s Surface Water Quality Standards. Those two narrative provisions provide, respectively, that 1) waters of the State shall be maintained to prevent adverse toxic effects on human health resulting from ingestion of chemically contaminated aquatic organisms; and 2) waters of the State shall be free from pollutants that may endanger public health. Any segment for which fish consumption advisories are in place as of December 2003 will be placed in Category 5 for each of the chemicals of concern included in each advisory. In the event that fish consumption advisories have been lifted, or any chemical of concern has been removed from an advisory, any requirements to develop a TMDL for that chemical in that segment will be removed if the fish tissue data was originally the sole cause for placement of the segment on the 303(d) list. Ammonia assessments In fresh waters, ammonia’s toxicity is known to be controlled by both the temperature and pH of the water. EPA recommended criteria are based on the presence or absence of early life stages of fish and specify that the criterion should not be exceeded more than one time in a three-year
53 period. The applicable criterion is calculated for each sampling event. Total ammonia as nitrogen, temperature and pH data will be used to compare the total ammonia data to the calculated criterion at stations whose average salinity during the assessment period was below 5 ppt according to the following formulas:
When fish early life stages are present: 0.0577 2.487 Criterion = ------+ ------* MIN (2.85, 1.45 *100.028*(25- T)) 1 + 107.688-pH 1 + 10pH-7.688 When fish early life stages are absent: 0.0577 2.487 Criterion= ------+ ------* [1.45 100.028*(25-MAX (T,7))] 1 + 107.688-pH 1 + 10pH-7.688 If two or more sampling events from the same station result in exceedances of the calculated criteria, the station will be deemed not supported for aquatic life use support based on ammonia toxicity. Temperature Assessments Delaware surface water quality criteria indicate that, in freshwaters, no human induced increase of the daily maximum temperature above 86oF (30.0 oC) shall be allowed and in marine waters the maximum human induced temperature is 87 oF (30.6 oC). Stations for which two or more sampling events are above the criteria and whose segments receive thermal discharges will be deemed not in support of the aquatic life use. Setting Priorities for Water Quality Limited Segments Still Needing TMDLs Because there are more water quality issues and impacts than there are public and private resources to address those impacts, it is necessary to set priorities for water quality limited segments. This is true for Delaware as well as the country as a whole. With this in mind, and recognizing the need to provide a logical, deliberate, and reasonable path forward, it becomes necessary to organize and order the work at hand into different priorities based upon a number of factors. The Department has been working under a Consent Decree that proscribes the timetable for TMDL establishment for waters listed on the 1996 303(d) List. The timetable was based on the Department’s Whole Basin Management Program rotating basin schedule. As new waters are added to the list, most will be incorporated into the current TMDL schedule. Those waters and pollutants not already addressed by the Consent Decree schedule will be added to the schedule based upon the rotating basin schedule shown below.
54 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Basin Year for TMDL Development Piedmont 2009 Chesapeake Bay 2010 Delaware Bay 2011 Delaware Estuary 2012 Inland Bays/Atlantic Ocean 2013
Rationale Used to Designate a Lower Category for Segments Previously Designated for TMDL Development The Department may move segments from prior 303(d) Lists (equivalent to Category 5) to another category based on any of the following factors, and will document the reasons for doing so on a case-by-case basis. The assessment and interpretation of more recent or more accurate data demonstrate that the applicable WQS(s) is being met. (Move to category 1) The results of more sophisticated water quality modeling demonstrate that the applicable WQS(s) is being met. (Move to category 1) Demonstration that flaws in the original analysis of data and information led to the water being incorrectly listed. (Move to category 1) The development of a new listing methodology, consistent with State WQSs and federal listing requirements, and a reassessment of the data that led to the prior listing, concluding that WQSs are now attained. (Move to category 1) A demonstration pursuant to 40 CFR 130.7(b)(1)(ii) that there are effluent limitations required by State or local authorities that are more stringent than technology-based effluent limitations required by the CWA and that these more stringent effluent limitations will result in the attainment of WQSs for the pollutant causing the impairment. (Move to category 4A or 4B until data and analysis support move to Category 1) A demonstration pursuant to 40 CFR 130.7(b)(1)(iii) that there are other pollution control requirements required by State, local, or federal authority that will result in attainment of WQSs for a specific pollutant(s) within a reasonable time. (Move to category 4A or 4B until data and analysis support move to Category 1) Documentation that the State included on a previous Section 303(d) List an impaired water that was not required to be listed by EPA regulations; e.g., waters where there is no pollutant associated with the impairment. (Move to category 1 or 4C as appropriate) Approval or establishment by EPA of a TMDL since the last Section 303(d) List. (Move to category 4A or 4B until data and analysis support move to Category 1)
55
State of Delaware 2004 Combined 305(b) Report and 303(d) List
Flow Charts for Designated Use Attainment
57
State of Delaware 2004 Combined 305(b) Report and 303(d) List
Assessment of Aquatic Life Use Support Using June through September Average Dissolved Oxygen Criteria
Continuous Lab Field Monitoring Data Data Data
Calculate Daily Average at each station Compute Station Daily Averages (SDAs) by averaging these values
Are there 10 or more days No of Data for this Station?
Insufficient Data to Determine DO Average ALUS, Go to DO Yes Minimum
Find upper limit of confidence interval of 10th Percentile of SDAs for Station
Is upper limit above Average Criterion at all stations? No
Segment does not Yes support Aquatic Life Use
Segment Supports ALUS DO Average Criteria; go to Minimum DO Flow Chart
59 Assessment of Aquatic Life Use Support Using Minimum Dissolved Oxygen Criteria
Are there two or more SDAs below the applicable minimum? Yes Segment does not No support Aquatic Life Use Is there continuous monitoring data available at this station? No
Yes Station Supports aquatic life with regard to minimum DO
Calculate upper limit of the 1st percentile confidence interval for each year of available continuous monitoring readings at each station in segment
Is upper limit above the minimum criteria for all stations in a segment? No
Segment does not support Aquatic Yes Life Use
Segment minimum DO supports Aquatic Life Use
60 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Assessment of Primary Contact Use Support in Segments that do not have Beach Monitoring Programs
Is there data for 10 or Insufficient Data to more sampling days? No Determine Primary or Contact Use Support
Yes
Calculate LCL of the 90th percentile of Enterococcus data in the segment
Is the LCL of the 90th Yes percentile above the single sample maximum?
Primary Contact use is Not Supported
No
Primary Contact use is Fully Supported
61 Assessment of Primary Contact Use Support in Segments with Beach Monitoring Programs
Determine annual count of beach closures in the segment due to Enterococcus data
Has there been more than 1 beach closure in the segment in any calendar Yes year?
Primary Contact use is Not Supported
No
Primary Contact use is Fully Supported
62 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Assessment of ERES Designated Use Attainment
Do Kruskal-Wallis seasonality test on available data for each parameter
Is there seasonality in the data?
No Yes
Use Sen’s Slope estimator to Use Seasonal Kendall assess trend Slope indicator to assess trend
Is there a significant trend upwards for Total N, Total P or downward trend for DO at any station in the segment??
No Yes
ERES use is ERES use is not Supported supported
63 References: Helsel D.R. and R.M. Hirsch, 2002, Statistical Methods in Water Resources Publication available at: http://water.usgs.gov/pubs/twri/twri4a3/ Conover, W.J., 1980, Practical Nonparametric Statistics, 2 ed., John Wiley and Sons
64
State of Delaware 2004 Combined 305(b) Report and 303(d) List
Summary Data Tables The following summary table (Table III-3) was compiled using the EPA provided Assessment Database. The table summarizes 2004 Use Support determinations in Table III-5.
69
State of Delaware 2004 Combined 305(b) Report and 303(d) List
Individual Use Support Summary (National and State Uses) Type of Waterbody: River Note: All numbers are in Miles Size Fully Size Size Size Fully Supporting but Partially Size Not Size Not Use Assessed Supporting Threatened Supporting Supporting Attainable
Aquatic Life Support 2506.07 881.29 0.00 626.87 997.91 0.00 Cold Water Fishery 66.60 53.80 0.00 0.00 12.80 0.00 Shellfishing 5.20 0.00 0.00 0.00 5.20 0.00 ERES (Exc. Rec.& Eco. Sig.) 881.05 1.00 0.00 275.90 604.15 0.00 Primary Contact (Recr) 2506.07 153.64 0.00 506.00 1,846.43 0.00 Secondary Contact (Recr) 2506.07 2506.07 0.00 0.00 0.00 0.00 Drinking Water Supply 204.50 198.50 0.00 0.00 6.00 0.00 Agriculture 1,928.07 1,928.07 0.00 0.00 0.00 0.00 Industrial 2,448.74 2,448.74 0.00 0.00 0.00 0.00
71 Individual Use Support Summary (National and State Uses) Type of Waterbody: Freshwater Lake Note: All numbers are in Acre Size Fully Size Size Size Fully Supporting but Partially Size Not Size Not Use Assessed Supporting Threatened Supporting Supporting Attainable
Aquatic Life Support 2,953.90 2,240.20 0.00 481.50 232.20 0.00 ERES (Exc. Rec.& Eco. Sig.) 757.80 256.70 0.00 361.90 139.20 0.00 Primary Contact (Recr) 2,953.90 941.80 0.00 1,365.20 646.90 0.00 Secondary Contact (Recr) 2,953.90 2,026.70 0.00 769.40 157.80 0.00 Drinking Water Supply 295.60 295.60 0.00 0.00 0.00 0.00 Agriculture 2,764.60 2,764.60 0.00 0.00 0.00 0.00 Industrial 2,953.90 2,953.90 0.00 0.00 0.00 0.00 Nondegradation 33.00 33.00 0.00 0.00 0.00 0.00
72 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Individual Use Support Summary (National and State Uses) Type of Waterbody: Estuary Note: All numbers are in Square Miles Size Fully Size Size Size Fully Supporting but Partially Size Not Size Not Use Assessed Supporting Threatened Supporting Supporting Attainable
Aquatic Life Support 28.95 0.00 0.00 25.00 3.95 0.00 Shellfishing 14.54 0.59 0.00 13.95 0.00 0.00 ERES (Exc. Rec.& Eco. Sig.) 29.54 0.00 0.00 25.00 4.54 0.00 Primary Contact (Recr) 29.54 12.00 0.00 13.00 4.54 0.00 Secondary Contact (Recr) 28.95 28.95 0.00 0.00 0.00 0.00 Industrial 28.95 28.95 0.00 0.00 0.00 0.00
73 Table III-3 Individual Use Support Summary (continued)
Individual Use Support Summary (National and State Uses) Type of Waterbody: Coastal Waters Note: All numbers are in Miles Size Fully Size Size Size Fully Supporting but Partially Size Not Size Not Use Assessed Supporting Threatened Supporting Supporting Attainable
Aquatic Life Support 25.00 25.00 0.00 0.00 0.00 0.00 Primary Contact (Recr) 25.00 25.00 0.00 0.00 0.00 0.00 Secondary Contact (Recr) 25.00 25.00 0.00 0.00 0.00 0.00 Industrial 25.00 25.00 0.00 0.00 0.00 0.00 Nondegradation 25.00 25.00 0.00 0.00 0.00 0.00
74 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Chapter 3: Rivers/Streams, Estuaries and Lakes Water Quality Assessments and List of Waters needing TMDLs Presented on the following pages are three tables. Table III-4 is a summary of data collected by the Department in the period from September 1, 1998 through August 31, 2003, by station. For each monitoring station, the segment number, segment description and location are shown with the summary statistics. Table III-5 rolls up the stations into their segments and shows the current use attainment for each segment . Table III-6 is the Final Determination for the State of Delaware Clean Water Act Section 303(d) List of Waters Needing TMDLs. Table III-6 integrates current and past assessments into a list of waters needing TMDLs. Causes/Stressors and Sources of Impairment of Designated Uses Nutrients, low dissolved oxygen, and biology and habitat degradation were the leading cause of nonsupport of Aquatic Life uses. A direct correspondence was found between the trend in biological quality and the quality of physical habitat. Habitat degradation may result in exceedences of the dissolved oxygen and temperature criteria. Sources of biological and habitat impairment are due to nonpoint source pollution mainly from urban and agricultural runoff. Pathogenic indicators (bacteria) are the most widespread pollutants impacting designated uses. The pathogen indicator monitored by the State for primary contact recreation is Enterococcus bacteria. Other pathogen indicators, such as total coliform and fecal coliform bacteria, are monitored to regulate shellfish harvesting areas. Indicator organisms are not a threat to human health or aquatic life, but their presence in abundant numbers signals an increased probability that disease causing organisms may be present. Although pathogenic indicators are the most widespread contaminant in the State, nutrients and toxics pose the most serious threats to water quality, aquatic life, and human health. Most of the State’s estuarine waters are considered nutrient enriched. Water quality and aquatic life impacts from nutrient enrichment include eutrophication and low dissolved oxygen levels. A large portion of the nutrients are transported to the estuaries and lakes by the rivers and ground water. The presence of toxics has resulted in fish consumption advisories in three basins within Delaware, including Red Clay Creek, Red Lion Creek, St. Jones River and the Delaware Estuary. Several other basins are considered threatened by toxic contamination. Due to the ubiquitous nature of many pollutants such as pathogen indicators, positive identification of specific sources, and their relative impact, is difficult. Hence, multiple sources are cited for most cases. Agricultural runoff, nonpoint sources, urban runoff, and municipal and industrial point sources are the primary sources of nutrients and toxics.
75
Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment 109091 DE 010-001-01 Lower Appoquinimink River Confluence with Delaware River 20 0 1 10 5.55 5.1 1 109121 DE 010-001-01 Lower Appoquinimink River Rt. 9 Bridge 20 2 5 10 3.85 4.5 5 109141 DE 010-001-01 Lower Appoquinimink River Mouth of East Br. Drawyer Creek 20 2 5 10 3.3 4.1 5 Upper Appoquinimink River - 109041 DE 010-001-02 Odessa Rt. 13 Bridge 21 2 5 11 3.5 2.4 5 Upper Appoquinimink River - 109051 DE 010-001-02 Odessa Rt. 299 Bridge, Odessa 20 4 5 10 3.4 3.0 5 Upper Appoquinimink River - 109151 DE 010-001-02 Odessa Above West Br. Drawyer Creek 20 3 5 10 3.405 3.7 5 Upper Appoquinimink River - 109171 DE 010-001-02 Odessa MOT Gut (Appo Gut) - West Bank 20 3 5 10 3.3 3.2 5 Lower Appoquinimink River - 109071 DE 010-001-03 Drawyer Creek Drawyer Creek, Rt 13 20 1 1 10 4.21 2.4 5 Lower Appoquinimink River - Tributary of Drawyer Creek at Marl 109201 DE 010-001-03 Drawyer Creek Pit Rd. 13 0 1 9 I.D. 0.0 3 Lower Appoquinimink River - Drawyer Creek above Shallcross 109211 DE 010-001-03 Drawyer Creek Lake at Ceder Lane Rd. 9 0 1 5 I.D. 0.0 3 Upper Appoquinimink - Downstream of Wiggins Mill Pond 109221 DE 010-002-01 Wiggins Mill Pond Branch at Rt. 71 8 1 1 4 I.D. 0.0 3 Upper Appoquinimink - Upstream of Wiggins Mill Pond at 109231 DE 010-002-01 Wiggins Mill Pond Branch Grears Corner Rd. 8 1 1 5 I.D. 0.0 3 Upper Appoquinimink, Deep Creek To Confluence With Deep Creek Branch at Rt. 71 109081 DE 010-002-02 Silver Bridge (Middletown Nat 4 0 1 4 I.D. 0.0 3 Upper Appoquinimink, Deep Creek To Confluence With 109241 DE 010-002-02 Silver Deep Creek at DE Rt. 15 7 0 1 4 I.D. 0.0 3 Upper Appoquinimink, Deep Creek To Confluence With Deep Creek above Silver Lake at 109251 DE 010-002-02 Silver Rt. 71 9 0 1 5 I.D. 0.0 3
109131 DE 010-L01 Noxontown Pond Noxontown Pond Overflow, Rd 38 20 0 1 10 7.2 0.1 1 109031 DE 010-L02 Silver Lake Silver Lake Overflow, Rd 442 19 0 1 10 8.6 0.1 1 109191 DE 010-L03 Shallcross Lake Shallcross Lake Overflow 20 0 1 10 5.5 0.1 1 114011 DE 020-001 Lower Army Creek Rt. 9 20 4 5 9 I.D. 0.0 3 77 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment No name trib. At Rt. 13 near Airport 114041 DE 020-001 Lower Army Creek Ind. Park 4 0 1 3 I.D. 0.0 3 114021 DE 020-002 Upper Army Creek Rt. 13 Bridge 19 1 1 8 I.D. 0.0 3 No name trib. At Rt. 40 near Airport 114051 DE 020-002 Upper Army Creek Ind. Park 3 0 1 2 I.D. 0.0 3 110031 DE 030-001 Lower Blackbird Creek Blackbird Landing 7 2 5 4 I.D. 0.0 3 110041 DE 030-001 Lower Blackbird Creek Rt. 9 Taylors Bridge 20 3 5 8 I.D. 0.0 3 110011 DE 030-002 Upper Blackbird Creek Blackbird Station 6 0 1 3 I.D. 0.0 3 110021 DE 030-002 Upper Blackbird Creek Rt. 13 (Northern Branch 20 2 5 8 I.D. 0.0 3 110101 DE 030-002 Upper Blackbird Creek Rd. 472 7 0 1 4 I.D. 0.0 3 110111 DE 030-002 Upper Blackbird Creek Barlow Br 7 0 1 4 I.D. 0.0 3 All Tributaries From The Headwaters To The 110091 DE 030-003 Confluence With Beaver Br. Rd 456 7 3 5 4 I.D. 0.0 3 104011 DE 040-001 Lower Brandywine River Foot Bridge 24 0 1 11 7.55 0.1 1 Upper Brandywine Creek, From State Line To Rd. 279 Bridge (USGS guage 104021 DE 040-002 Wilmington 01481500) 22 0 1 10 7.95 0.1 1 Upper Brandywine Creek, From State Line To 104051 DE 040-002 Wilmington Smith Bridge 24 0 1 11 7.275 0.1 1 Lower Broad Creek, Including Collins & Culvert Broad Creek At Road 28a, West 307021 DE 050-001 Ditch, Holly Bridge 111------Lower Broad Creek, Including Collins & Culvert Meadow Branch at Road 501 307151 DE 050-001 Ditch, Holly Bridge 4 0 1 1 I.D. 0.0 3 Portsville Pond on Tussocky Branch of Broad Creek, at county 307061 DE 050-002 Tussocky Branch road 496 5 0 1 2 I.D. 0.0 3 Tussocky Branch at Route 24 307291 DE 050-002 Tussocky Branch bridge 5 0 1 2 I.D. 0.0 3 307331 DE 050-002 Tussocky Branch Turkey Branch at Rt. 495 Bridge 101------Beaver Dam Branch at Rd. 447 307111 DE 050-004 Chipman Pond Branch Bridge (below Wileys Pond) 5 0 1 2 I.D. 0.0 3 78 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Chipman Pond Branch at Road 467 Bridge 9 below confluence of Mirey Branch and Elliot Pond 307121 DE 050-004 Chipman Pond Branch Branch 5 0 1 2 I.D. 0.0 3 Chipman Pond Branch at Rt. 465 Bridge, down stream of Chipman 307341 DE 050-004 Chipman Pond Branch Pond Spillway 5 0 1 2 I.D. 0.0 3 James Branch Including Pepper Pond Br., Hitch Pond Trap Pond on Hitch Pond Branch 307081 DE 050-005-01 Br., Etc. at County Road 449 4 0 1 2 I.D. 0.0 3 James Branch Including Pepper Pond Br., Hitch Pond Pepper Pond Branch at Rt. 24 307281 DE 050-005-01 Br., Etc. Bridge 5 1 1 2 I.D. 0.0 3 James Branch Including Pepper Pond Br., Hitch Pond 307351 DE 050-005-01 Br., Etc. Grays Branch at Rt. 62 Bridge 5 2 5 2 I.D. 0.0 3 James Branch Including Pepper Pond Br., Hitch Pond 307361 DE 050-005-01 Br., Etc. Pepper Branch at Rt 62 Bridge 5 3 5 2 I.D. 0.0 3 James Branch Including Pepper Pond Br., Hitch Pond 307381 DE 050-005-01 Br., Etc. James Branch at Rd. 451 Bridge 5 1 1 2 I.D. 0.0 3 James Branch Including Pepper Pond Br., Hitch Pond 307391 DE 050-005-01 Br., Etc. James Branch on Rt. 24 Bridge 5 0 1 2 I.D. 0.0 3 304671 DE 050-006-03 Raccoon Prong Raccoon Prong at RT 66 3 0 1 2 I.D. 0.0 3
307221 DE 050-006-03 Raccoon Prong Thomson Branch at Rd. 72 Bridge 4 0 1 1 I.D. 0.0 3 307371 DE 050-006-03 Raccoon Prong Raccoon Prong at Rd. 62 Bridge 3 1 1 1 I.D. 0.0 3 Tussocky Branch at Count Road 307101 DE 050-L02 Tussock Pond 494, southwest of Laurel 5 0 1 2 I.D. 0.0 3 Horseys Pond 50 Yards Above 307171 DE 050-L03 Horseys Pond Spillway 50% R.B. 20 0 1 11 7.3 0.1 1 307011 DE 050-L04 Records Pond Records Pond Overflow 20 0 1 11 7.79 0.1 1 307401 DE 050-L04 Records Pond Records Pond Spillway 4 0 1 1 I.D. 0.0 3 79 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment 307411 DE 050-L04 Records Pond Ward's Branch at 64 111------Chipman Pond, 2/3 distance from Chipman Pond & Wileys Spillway to inflow stream 307131 DE 050-L05 Pond confluence 5 0 1 2 I.D. 0.0 3 James Branch, outflow of Trussum 307091 DE 050-L06 Trussum Pond Pond at Rd. 72 Bridge 5 2 5 2 I.D. 0.0 3 Trap Pond, 200 yard above 307181 DE 050-L07 Trap Pond Spillway 5 0 1 2 I.D. 0.0 3 Racoon Prong at Racoon Pond 307201 DE 050-L08 Raccoon Pond Spillway (Road 72 Bridge) 3 1 1 1 I.D. 0.0 3 303041 DE 060-001 Lower Broadkill River Rt. 1 Bridge (Mainstem) 19 0 1 8 I.D. 0.0 3 303061 DE 060-001 Lower Broadkill River 0.1 miles from mouth 8 0 1 5 I.D. 0.0 3 303081 DE 060-001 Lower Broadkill River 2.14 miles from mouth 8 1 1 5 I.D. 0.0 3 303171 DE 060-002 Beaverdam Creek Beaverdam Creek at Rd. 88 19 2 5 8 I.D. 0.0 3 303181 DE 060-002 Beaverdam Creek Beaverdam Creek at Rd. 259 19 1 1 8 I.D. 0.0 3 303211 DE 060-002 Beaverdam Creek Beaverdam Creek at Rd. 257 8 0 1 5 I.D. 0.0 3 303491 DE 060-002 Beaverdam Creek Beaverdam Creek at Rd. 293 3 0 1 1 I.D. 0.0 3 303031 DE 060-003 Upper Broadkill River Broadkill River at Rt. 5 Bridge 19 0 1 8 I.D. 0.0 3 303131 DE 060-003 Upper Broadkill River 9.86 miles from mouth 8 0 1 5 I.D. 0.0 3 303311 DE 060-004 Round Pole Branch Round Pole Branch at Rd. 88 18 1 1 7 I.D. 0.0 3 303011 DE 060-005 Ingram Branch Ingram Branch at Rd. 246 19 0 1 8 I.D. 0.0 3 303021 DE 060-005 Ingram Branch Ingram Branch at Rd. 248 19 0 1 8 I.D. 0.0 3 303241 DE 060-005 Ingram Branch Ingram Branch at Rd. 319 8 0 1 5 I.D. 0.0 3 303261 DE 060-005 Ingram Branch Ingram Branch S. of 245/246 8 0 1 5 I.D. 0.0 3 Savannah Ditch 1/2 mile N. of 303281 DE 060-005 Ingram Branch Townsend discharge 8 0 1 5 I.D. 0.0 3 303481 DE 060-005 Ingram Branch Ingrams Branch Rt. 30 9 6 5 2 I.D. 0.0 3 303341 DE 060-006 Pemberton Branch Pemberton Branch at Rt. 30 19 0 1 8 I.D. 0.0 3 303051 DE 060-007-01 Lower Red Mill Branch Red Mill Pond at Rt. 1 19 0 1 8 I.D. 0.0 3 303406 DE 060-007-02 Martin Branch Martins Br. at Rt. 30 8 0 1 5 I.D. 0.0 3 303231 DE 060-L01 Red Mill Pond Trib. to Red mill Pond 19 1 1 8 I.D. 0.0 3 303351 DE 060-L02 Waggamons Pond Waggamons Pond Outlet 19 0 1 8 I.D. 0.0 3 Waples Pond & Reynolds 303331 DE 060-L03 Pond Waples Pond at Rt. 1 19 0 1 8 I.D. 0.0 3
80 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Waples Pond & Reynolds 303381 DE 060-L03 Pond Sowbridge Branch at Rd. 212 19 2 5 8 I.D. 0.0 3 311041 DE 070-001 Bunting's Branch Rd. 54 17 1 1 9 I.D. 0.0 3 301031 DE 080-001 Lower Cedar Creek Rt. 1 Bridge 20 0 1 8 I.D. 0.0 3 301091 DE 080-001 Lower Cedar Creek Rt. 36 Bridge 20 3 5 8 I.D. 0.0 3 Upper Cedar Creek, Headwaters To Cedar Creek 301011 DE 080-002 Mill Pond Clendaniel Pond outfall @ Rd. 38 7 0 1 4 I.D. 0.0 3 Upper Cedar Creek, Headwaters To Cedar Creek 301021 DE 080-002 Mill Pond Rd. 212 20 1 1 8 I.D. 0.0 3 Upper Cedar Creek, Headwaters To Cedar Creek 301041 DE 080-002 Mill Pond Cubbage Pond outfall @ Rd. 38 7 0 1 4 I.D. 0.0 3 Upper Cedar Creek, Headwaters To Cedar Creek 301051 DE 080-002 Mill Pond Greentop Rd. 7 0 1 4 I.D. 0.0 3 Upper Cedar Creek, Headwaters To Cedar Creek Upstream side of Rt. 113 upstream 301061 DE 080-002 Mill Pond of Hudson Pond 7 2 5 4 I.D. 0.0 3 Upper Cedar Creek, Headwaters To Cedar Creek 301071 DE 080-002 Mill Pond Church Br. @ Rd. 214 6 0 1 3 I.D. 0.0 3 Upper Cedar Creek, Headwaters To Cedar Creek Middle of Cedar Creek Mill Pond @ 301151 DE 080-002 Mill Pond Rd. 224 7 0 1 4 I.D. 0.0 3 Upper Cedar Creek, Headwaters To Cedar Creek 301161 DE 080-002 Mill Pond Middle of Hudson Pond 7 2 5 4 I.D. 0.0 3 301141 DE 080-003 Slaughter Creek Slaughter Creek @ Rd. 224 7 5 5 4 I.D. 0.0 3 Chesapeake And Delaware Canal From Maryland Line 108021 DE 090-001 To Delaware St. Georges Bridge 20 0 1 9 I.D. 0.0 3
81 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Chesapeake And Delaware Canal From Maryland Line 108031 DE 090-001 To Delaware Summit Bridge 20 0 1 9 I.D. 0.0 3 108111 DE 090-L01 Lums Pond Lums Pond Boat Ramp 20 0 1 9 I.D. 0.0 3 Cypress Branch at Delaney Corner 112011 DE 100-001 Cypress Branch (Rt. 40) Bridge 9 2 5 4 I.D. 0.0 3 112021 DE 100-001 Cypress Branch Sewell Branch at Rd. 95 19 4 5 8 I.D. 0.0 3 Cypress Branch at Morris Road 112581 DE 100-001 Cypress Branch (Rt. 477) Bridge 9 3 5 4 I.D. 0.0 3 Sewell Branch at Blackson Church 112591 DE 100-002 Sewell Branch Road (Rt. 131) Bridge 10 1 1 4 I.D. 0.0 3 Jordan Branch at Underwoods 112601 DE 100-002 Sewell Branch Corner Road (Rt. 94) Bridge 10 1 1 4 I.D. 0.0 3
112031 DE 100-003 Gravelly Run Gravelly Run at Stilltown Rd., MD 19 3 5 8 I.D. 0.0 3 Gravelly Run at Lion Hope Road ( 112611 DE 100-003 Gravelly Run Rt. 143) Bridge 10 0 1 4 I.D. 0.0 3 Gravelly Run at Fords Corner Road 112621 DE 100-003 Gravelly Run (Rt.98) Bridge 10 2 5 4 I.D. 0.0 3 Muddy Bottom Ditch at Chapel 112631 DE 100-003 Gravelly Run Road ( Rt. 97) Bridge 10 1 1 4 I.D. 0.0 3 207081 DE 110-001 Tappahanna Ditch Tappahanna Ditch at Rd. 222 19 1 1 8 I.D. 0.0 3 Tappahanna Ditch at RT. 8 Bridge 207121 DE 110-001 Tappahanna Ditch near Green Brier 10 4 5 5 I.D. 0.0 3 Tappahanna Ditch at Tuxward 207131 DE 110-001 Tappahanna Ditch Road (Rt. 220) Bridge 10 1 1 5 I.D. 0.0 3 207091 DE 110-002 Culbreth Marsh Ditch Culbreth Marsh at Rd. 210 19 5 5 8 I.D. 0.0 3 Culbreth Marsh Ditch at Lucks 207141 DE 110-002 Culbreth Marsh Ditch Drive (Rt. 223) Bridge 10 3 5 5 I.D. 0.0 3
Culbreth Marsh Ditch at Old Point 207151 DE 110-002 Culbreth Marsh Ditch School Road (Rt. 215) Bridge 9 5 5 5 I.D. 0.0 3 207021 DE 110-003 Cow Marsh Creek Cow Marsh Creek at Rd. 208 19 1 1 8 I.D. 0.0 3 Cow Marsh Creek at Hollering Hills 207181 DE 110-003 Cow Marsh Creek Road (Rt. 213) Bridge 10 1 1 5 I.D. 0.0 3 82 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Cow Marsh Creek at Willow Grow 207191 DE 110-003 Cow Marsh Creek Road Rt. 10) Bridge 10 4 5 5 I.D. 0.0 3
207011 DE 110-L01 Mud Mill Pond Mud Mill Pond At Road 207 Bridge 2 0 1 2 I.D. 0.0 3 207111 DE 110-L01 Mud Mill Pond White Marsh Branch at Rd. 268 17 3 5 6 I.D. 0.0 3 Mud Millpond Outflow at Mud Mill 207161 DE 110-L01 Mud Mill Pond Road (Rt. 207) Bridge 10 2 5 5 I.D. 0.0 3
Tidy Island Creek Bridge at continuation of Westville Road (Rt. 207171 DE 110-L01 Mud Mill Pond 206) in MD (inflow to Mud Millpond) 10 0 1 5 I.D. 0.0 3 106011 DE 120-001 Lower Christina River Rt. 13/Rt. 9 Bridge 21 0 1 9 I.D. 0.0 3 Conrail Bridge (USGS tide gage 106291 DE 120-001 Lower Christina River 01481602) 21 0 1 9 I.D. 0.0 3 Mid Christina River, Between White Clay Creek And Rt. 141, Newport (USGS tide gage 106021 DE 120-002 Brandywine 01480065) 21 0 1 9 I.D. 0.0 3 Christina River Tributaries From Smalleys Pond Leatherinans Run at Old Baltimore 106321 DE 120-003-02 Overflow To Pike Road Bridge 7 2 5 3 I.D. 0.0 3 Christina River at Old Walter Road 106111 DE 120-004-01 Lower Christina Creek (Rd 346) Bridge 1 1 1 1 I.D. 0.0 3 Old Baltimore Pike, Below Newark 106141 DE 120-004-01 Lower Christina Creek (USGS guage 01478000) 21 0 1 9 I.D. 0.0 3 Christina River at Old Walter Road 106331 DE 120-004-01 Lower Christina Creek (Rd 346) Bridge 6 1 1 2 I.D. 0.0 3 106341 DE 120-004-02 Belltown Run Belltown Run at Rt. 72 Bridge 7 1 1 3 I.D. 0.0 3 106191 DE 120-006 Upper Christina Creek Rt. 273, Above Newark 24 0 1 11 8.09 0.1 1 Little Mill creek, Atlantic Avenue 106281 DE 120-007-01 Little Mill Creek (USGS Gage 01480095) 21 0 1 9 I.D. 0.0 3 106031 DE 120-L01 Smalleys Pond Smalley's Dam Spillway 24 2 5 11 3.9 0.1 5 Beck's Pond outflow at Salem 106121 DE 120-L02 Becks Pond Church Rd. Bridge 1 0 1 1 I.D. 0.0 3 Beck's Pond outflow at Salem 106351 DE 120-L02 Becks Pond Church Rd. Bridge 6 0 1 2 I.D. 0.0 3 83 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Outflow of Sunset Pond at Rt. 72 106131 DE 120-L03 Sunset Pond Bridge 1 1 1 1 I.D. 0.0 3 Inflow to the Sunset Pond at 106361 DE 120-L03 Sunset Pond Corporate Blvd. 7 2 5 3 I.D. 0.0 3 The middle of Foot Bridge on the 106371 DE 120-L03 Sunset Pond Sunset Pond 7 2 5 3 I.D. 0.0 3 Outflow of Sunset Pond at Rt. 72 106381 DE 120-L03 Sunset Pond Bridge 6 1 1 2 I.D. 0.0 3 111011 DE 130-001 Lower Dragon Run Creek Rt. 9 Bridge 21 8 5 10 1.4 0.5 5 111021 DE 130-001 Lower Dragon Run Creek Rd. 378 7 4 5 4 I.D. 0.0 3 111031 DE 130-002 Upper Dragon Run Creek Rt. 13 Bridge (flow at Rd. 407) 17 4 5 6 I.D. 0.0 3 111041 DE 130-002 Upper Dragon Run Creek Rd. 407 7 2 5 4 I.D. 0.0 3 111081 DE 130-002 Upper Dragon Run Creek Rt. 71 7 0 1 4 I.D. 0.0 3 Beaver Dam Ditch at Rt. 368 310121 DE 140-001 White Creek Bridge 19 3 5 10 3.99 0.1 5 White Creek at the mouth of 312011 DE 140-001 White Creek Assawoman Canal 20 0 1 10 4.68 25.4 5 Bundick's Branch at Rt. 23 Bridge 308361 DE 140-002 Blackwater Creek (Trib. Of Love Creek) 20 5 5 12 2.87 0.1 5 Pepper Creek And Tributaries, Including Vines 308091 DE 140-003 Creek, Mccrays Pepper Creek at Rt. 26 25 0 1 15 7.2 0.1 1 Pepper Creek And Tributaries, Including Vines 308101 DE 140-003 Creek, Mccrays Vines Creek at Rt. 26 Bridge 10 2 5 5 I.D. 0.0 3 Pepper Creek And Tributaries, Including Vines 308151 DE 140-003 Creek, Mccrays Vines Creek Rd. 382 11 5 5 5 I.D. 0.0 3 Pepper Creek And Tributaries, Including Vines 308351 DE 140-003 Creek, Mccrays Vines Creek Rd. 54 10 4 5 5 I.D. 0.0 3 Pepper Creek And Tributaries, Including Vines 308381 DE 140-003 Creek, Mccrays Vines Creek @ Rd. 376 10 1 1 5 I.D. 0.0 3
84 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Pepper Creek And Tributaries, Including Vines Deep Hole Branch at Rt. 382 308461 DE 140-003 Creek, Mccrays Bridge 12 4 5 7 I.D. 0.0 3 306181 DE 140-004 Indian River Buoy 49, Indian River 20 1 1 10 4.2 15.2 5 306191 DE 140-004 Indian River Buoy 55, Indian River 20 2 5 10 3.5 12.3 5 Swan Creek at Rt. 24 Bridge, 308061 DE 140-005 Swan Creek outflow from Longwood Pond 10 0 1 5 I.D. 0.0 3 308301 DE 140-005 Swan Creek Swan Creek, Rd. 304 20 0 1 10 7.37 0.1 1 308341 DE 140-005 Swan Creek Swan Creek at Rt. 297 Bridge 19 0 1 10 6.7 0.0 1 Stockley Branch, Cow Bridge 308141 DE 140-006 Stockley Branch Branch at Rd. 432 10 0 1 5 I.D. 0.0 3 308281 DE 140-006 Stockley Branch Cow Bridge Branch Rd. 48 20 1 1 10 6.5 0.1 1 Mirey Branch, Including Sheep Pen Ditch, And 319011 DE 140-009 Narrow Drain Sheep Pen Ditch at Rt. 328 Bridge 10 0 1 5 I.D. 0.0 3 Mirey Branch, Including Sheep Pen Ditch, And 319101 DE 140-009 Narrow Drain Mirey Branch at Rt. 318 Bridge 10 0 1 5 I.D. 0.0 3 308181 DE 140-010 Betts Pond Branch Shoals Branch at Rt. 412 Bridge 10 0 1 5 I.D. 0.0 3 308191 DE 140-010 Betts Pond Branch Phillips Ditch at Rt. 412 Bridge 10 1 1 5 I.D. 0.0 3
308391 DE 140-010 Betts Pond Branch Long Drain Ditch at Rt. 433 Bridge 5 3 5 3 I.D. 0.0 3 306121 DE 140-E01 Lower Indian River Bay Buoy 20, Indian River Bay 20 0 1 10 4.95 27.8 5 306131 DE 140-E01 Lower Indian River Bay Buoy 26, Indian River Bay 20 0 1 10 5.015 24.9 1 306321 DE 140-E01 Lower Indian River Bay Indian River Intlet 11 0 1 6 I.D. 0.0 3 306161 DE 140-E02 Upper Indian River Bay Buoy 38, Indian River 20 1 1 10 4.115 18.5 5 306331 DE 140-E02 Upper Indian River Bay Island Creek mouth 19 1 1 9 I.D. 0.0 3 306341 DE 140-E02 Upper Indian River Bay Island Creek, upper third 19 2 5 9 I.D. 0.0 3 308071 DE 140-L01 Millsboro Pond Millsboro Dam Overflow 20 0 1 88 3.72 0.1 5 Stockley Branch, Cow Bridge 308271 DE 140-L01 Millsboro Pond Branch at Rd. 318 10 0 1 5 I.D. 0.0 3 Outflow of Betts Pond at Rt. 326 308201 DE 140-L02 Betts Pond Bridge 10 0 1 5 I.D. 0.0 3 Middle of Betts Pond at Rt. 113 308401 DE 140-L02 Betts Pond Bridge 10 0 1 5 I.D. 0.0 3 85 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Outflow from the Ingram Pond at 308011 DE 140-L03 Ingram Pond Rt. 410 Bridge 10 0 1 5 I.D. 0.0 3 308171 DE 140-L03 Ingram Pond Deephole Br. @ Rd. 382 101------309011 DE 150-001 Iron Branch Iron Branch at Rt. 331 Bridge 10 1 1 5 I.D. 0.0 3 309021 DE 150-001 Iron Branch Iron Branch at Rt. 113 Bridge 20 0 1 10 5 0.1 5
309041 DE 150-001 Iron Branch Whartons Branch at Rt. 334 Bridge 25 0 1 15 6.065 0.1 1 309051 DE 150-001 Iron Branch Iron Branch at Rt. 82 Bridge 10 1 1 5 I.D. 0.0 3 202031 DE 160-001 Lower Leipsic River Rt. 42 19 8 5 10 3.02 7.2 5 202161 DE 160-001 Lower Leipsic River White Hall Landing 6 3 5 5 I.D. 0.0 3
202041 DE 160-002 Upper Leipsic River DE Rt. 42, 21.43 miles from mouth 19 9 5 10 2.5 5.7 5 202191 DE 160-002 Upper Leipsic River upstream Massey Rt. 15 7 0 1 5 I.D. 0.0 3 205271 DE 160-002 Upper Leipsic River Fork Branch Rd. 167 8 2 5 4 I.D. 0.0 3 Leipsic, Tributaries From Dam At Garrisons Lake To 202151 DE 160-003 Mouth At Willis Br. Rd. 92 7 1 1 5 I.D. 0.0 3 Leipsic, Tributaries From Dam At Garrisons Lake To 202181 DE 160-003 Mouth At Dyke Branch at Rt. 42 6 4 5 5 I.D. 0.0 3 Leipsic, Tributaries From Dam At Garrisons Lake To 202211 DE 160-003 Mouth At Rt. 6 7 0 1 5 I.D. 0.0 3
Tributaries From Headwaters 202171 DE 160-004 To Garrisons Lake Muddy Branch Rd. 86 7 5 5 5 I.D. 0.0 3 202021 DE 160-L01 Garrisons Lake Rt. 13 Bridge, Garrisons Lake 19 1 1 10 4.05 0.1 5 202141 DE 160-L01 Garrisons Lake 100 yd above Garrison 6 1 1 5 I.D. 0.0 3 202011 DE 160-L02 Masseys Mill Pond Rd. 42 Bridge at Masseys Pond 19 6 5 10 2.7 1.9 5 202201 DE 160-L02 Masseys Mill Pond mid-Massey Pond 6 0 1 5 I.D. 0.0 3 305011 DE 170-001 Lewes-Rehoboth Canal Canal Rt. 1 20 0 1 50 3.2 23.9 1 Lewes and Rehoboth Canal at Rt. 305021 DE 170-001 Lewes-Rehoboth Canal 14 Bridge 101------Lewes and Rehoboth Canal at Rt. 305041 DE 170-001 Lewes-Rehoboth Canal 18 Bridge 20 0 1 10 2.7625 25.0 5 86 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Lewes and Rehoboth Canal at 305051 DE 170-001 Lewes-Rehoboth Canal Canal Mouth near Lewes 10 0 1 5 I.D. 0.0 3 Lewes and Rehoboth Canal at 305061 DE 170-001 Lewes-Rehoboth Canal Holland Glade (Mid-Point) 101------Munchy Branch at Rd. 270A 305081 DE 170-001 Lewes-Rehoboth Canal (behind Midway Area) 19 0 1 10 4.35 0.1 1
311011 DE 170-001 Lewes-Rehoboth Canal Bunting Branch at Railroad Bridge 9 0 1 5 I.D. 0.0 3 311031 DE 170-001 Lewes-Rehoboth Canal Polly Branch at Rt. 386 Bridge 6 0 1 2 I.D. 0.0 3 Henlopen Marina See Cont. Cont. Continuous Station at Marina on Mon. Mon. DE 170-001 Lewes-Rehoboth Canal L&R Canal Results 5 46 2.64 28.2 5 Little Assawoman Canal at Rt. 357 312021 DE 180-001 Little Assawoman Canal Bridge 10 0 1 5 I.D. 0.0 3
312041 DE 180-001 Little Assawoman Canal Assawoman Canal, Rd. 361 Bridge 20 4 5 10 3.35 19.9 5 308441 DE 180-002 Miller Creek Beaverdam @ Rd. 84 10 1 1 5 I.D. 0.0 3 308451 DE 180-002 Miller Creek Beaverdam @ Rt. 17 9 5 5 5 I.D. 0.0 3 Beaver Dam Ditch, Rd. 363, Miller 310101 DE 180-002 Miller Creek Branch 20 6 5 10 3.725 9.3 5 310031 DE 180-003 Dirickson Creek Derrickson creek, Rd. 381 20 0 1 10 4.475 11.7 5 Little Assawoman Bay ditch at Rd. 310011 DE 180-E01 Little Assawoman Bay 58 Bridge 20 0 1 10 4.7 24.2 5 310071 DE 180-E01 Little Assawoman Bay Little Assawoman Mid-Bay 20 2 5 10 3.865 23.9 5 204021 DE 190-001-01 Lower Little Creek Pipe Elm Dr. Rd. 67 7 2 5 5 I.D. 0.0 3 204031 DE 190-001-01 Lower Little Creek Rt. 9 Bridge 20 3 5 10 3.5 10.3 5 204041 DE 190-001-02 Upper Little Creek Rt. 8 Bridge 20 11 5 10 2.25 0.3 5 204011 DE 190-001-03 Pipe Elm Branch Postal Corner Road (Rd. 348) 20 2 5 10 3.25 0.1 5 Marshyhope Creek, Rt. 404 Bridge, DE Rt. 16 302021 DE 200-001 Headwaters To State Line (Woodenhawk Bridge) 19 1 1 8 I.D. 0.0 3 Marshyhope Creek, 302031 DE 200-001 Headwaters To State Line Rt. 308 Bridge 19 1 1 8 I.D. 0.0 3 Marshyhope Creek, Marshyhope Creek at Hemping 302041 DE 200-001 Headwaters To State Line Road (Rt. 299) Bridge 10 0 1 5 I.D. 0.0 3 87 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Tributaries From The Marshyhope Ditch at Fox Hunters 302051 DE 200-002 Headwaters To State Line Road (Rt. 277) Bridge 9 1 1 4 I.D. 0.0 3 208021 DE 210-001 Lower Mispillion River Rt. 1 Bridge 18 0 1 6 I.D. 0.0 3 208051 DE 210-001 Lower Mispillion River Jetty At Mouth 6 0 1 3 I.D. 0.0 3 Mispillion River 0.43 miles from 208061 DE 210-001 Lower Mispillion River mouth at lighthouse 8 0 1 5 I.D. 0.0 3 208101 DE 210-001 Lower Mispillion River 4.64 miles from mouth 6 3 5 3 I.D. 0.0 3 208271 DE 210-001 Lower Mispillion River Mouth of Grecos Canal 6 1 1 3 I.D. 0.0 3 301081 DE 210-001 Lower Mispillion River Confluence w/ Mispillion 7 1 1 4 I.D. 0.0 3 Upper Mispillion River, Tantrough Branch at Rd. 442 or 208241 DE 210-002 Headwaters To Silver Lake 620 6 0 1 3 I.D. 0.0 3 Johnson Branch Including Its 208261 DE 210-003 Tributaries Johnson Branch at Rt. 36 6 0 1 3 I.D. 0.0 3 Johnson Branch Including Its Downstream from Griffith Lake 208371 DE 210-003 Tributaries outfall at Rd. 451 6 0 1 3 I.D. 0.0 3 Mispillion Tributaries From 208351 DE 210-004 Headwaters To Silver Lake Bowman Branch at Rd. 634 3 0 1 1 I.D. 0.0 3 Mispillion Tributaries From 208361 DE 210-004 Headwaters To Silver Lake Lednum Branch at Rd. 443 6 0 1 3 I.D. 0.0 3 Mispillion Tributaries From Dam At Silver Lake To The Mispillion River 7.14 miles from 208121 DE 210-005 Mouth mouth 7 4 5 4 I.D. 0.0 3 Mispillion Tributaries From Dam At Silver Lake To The 208221 DE 210-005 Mouth Tub Mill Branch at Rd. 404 5 0 1 2 I.D. 0.0 3 Mispillion Tributaries From Dam At Silver Lake To The 208281 DE 210-005 Mouth Causeway Branch at Rd. 123 6 2 5 3 I.D. 0.0 3 Mispillion Tributaries From Dam At Silver Lake To The 208291 DE 210-005 Mouth Fishing Branch at Rd. 124 6 1 1 3 I.D. 0.0 3 Mispillion Tributaries From Dam At Silver Lake To The Swan Creek at downstream side of 208301 DE 210-005 Mouth Rt. 113 6 1 1 3 I.D. 0.0 3
88 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Mispillion Tributaries From Dam At Silver Lake To The 208331 DE 210-005 Mouth Mullet Run at Rt. 14 6 0 1 3 I.D. 0.0 3 208311 DE 210-L01 Tub Mill Pond Middle of Tub Mill Pond 6 0 1 3 I.D. 0.0 3 208211 DE 210-L02 Silver Lake Rt. 36 Silver Lake 19 0 1 7 I.D. 0.0 3 208321 DE 210-L02 Silver Lake Middle of Silver Lake 6 0 1 3 I.D. 0.0 3 208011 DE 210-L03 Haven Lake Haven Lake at Rt. 113 19 0 1 7 I.D. 0.0 3 208341 DE 210-L03 Haven Lake Middle of Haven Lake 6 0 1 3 I.D. 0.0 3 208381 DE 210-L04 Griffith Lake Middle of Griffith Lake 6 0 1 3 I.D. 0.0 3 208191 DE 210-L05 Blairs Pond Blairs Pond off Rd. 443 19 0 1 7 I.D. 0.0 3 208231 DE 210-L05 Blairs Pond Rt. 384 Beaverdam branch 19 0 1 7 I.D. 0.0 3 208391 DE 210-L05 Blairs Pond Middle of Blairs Pond at Rd. 443 6 1 1 3 I.D. 0.0 3 208181 DE 210-L06 Abbotts Pond Abbotts Pond at Rd. 620 19 0 1 7 I.D. 0.0 3 208401 DE 210-L06 Abbotts Pond Middle of Abbotts Pond 6 1 1 3 I.D. 0.0 3 206091 DE 220-001 Lower Murderkill River US Rt. 113 20 8 5 13 2.305 2.4 5 206101 DE 220-001 Lower Murderkill River Bowers Beach Wharf 19 0 1 12 4.55 21.5 5 Webb Landing (1.25 miles from the 206131 DE 220-001 Lower Murderkill River mouth) 20 3 5 13 3.56 18.6 5 206141 DE 220-001 Lower Murderkill River 3.25 miles from the mouth 20 11 5 13 2 11.4 5 206151 DE 220-001 Lower Murderkill River 5.39 miles from the mouth 101------Confluence of Kent County STP 206231 DE 220-001 Lower Murderkill River trib. 20 12 5 13 1.915 4.5 5 206081 DE 220-002 Spring Creek Spring Creek at Rt. 12 Bridge 20 7 5 13 2.51 1.9 5 Spring Creek, Double Run at Irish 206601 DE 220-002 Spring Creek Hill Rd. 7 0 1 4 I.D. 0.0 3 Spring Creek, Double Run at 206611 DE 220-002 Spring Creek Peachtree Hill Rd. 5 0 1 4 I.D. 0.0 3 Spring Creek, Double Run at US 206621 DE 220-002 Spring Creek Rt. 13 3 1 1 2 I.D. 0.0 3 Spring Creek, Hudson Branch at 206631 DE 220-002 Spring Creek US Rt. 13 5 0 1 4 I.D. 0.0 3 Spring Creek, Pratt Branch at 206641 DE 220-002 Spring Creek Canterbury Rd. 5 0 1 4 I.D. 0.0 3
89 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment See Cont. Mon. 206171 DE 220-003 Mid Murderkill River Murderkill River, at Road 338 Results 5 65 3.06 2.9 5 206211 DE 220-003 Mid Murderkill River 9.64 miles from mouth 101------206041 DE 220-004 Browns Branch Browns Branch at Rt. 14 Bridge 20 0 1 13 4.49 0.1 5
206051 DE 220-004 Browns Branch Browns Branch at RD. 384 Bridge 20 0 1 13 6.5425 0.1 1 See Cont. Murderkill River, trib to Browns BR at Rd. Mon. 206251 DE 220-004 Browns Branch 398 Results 1 82 12 7.7 1
Tributary of Browns Branch at US 206421 DE 220-004 Browns Branch Rt. 13, east edge of Harrington 1 0 1 1 I.D. 0.0 3 Browns Branch at Dr. Smith Rd. 206701 DE 220-004 Browns Branch (Rt. 431) 6 0 1 6 I.D. 0.0 3 206011 DE 220-005 Upper Murderkill River US Rt. 13 Bridge below Felton 20 0 1 13 6.3 0.1 1
Tributary of Browns Branch at US 206651 DE 220-005 Upper Murderkill River Rt. 13, east edge of Harrington 9 0 1 8 I.D. 0.0 3 Upper Murderkill River at Little Masten Rd., downstream of the confluence with Beaverdam 206661 DE 220-005 Upper Murderkill River Branch 5 2 5 4 I.D. 0.0 3
Upper Murderkill River, Black 206671 DE 220-005 Upper Murderkill River Swamp Creek at Marshyhope Rd. 5 0 1 4 I.D. 0.0 3 Spring Branch above Cursey Pond 206681 DE 220-005 Upper Murderkill River at Chimney Hill Rd. 5 0 1 4 I.D. 0.0 3 206461 DE 220-L01 Mcginnis Pond Hudson Branch, McGinnis Pond 20 0 1 13 8.01 0.1 1 206561 DE 220-L01 Mcginnis Pond Double Run at Rt. 371 Bridge 20 0 1 13 4.4 0.1 5 206071 DE 220-L02 Andrews Lake Andrews Lake at Rd. 380 Bridge 20 0 1 13 6.48 0.1 1 206451 DE 220-L03 Coursey Pond Coursey Pond at Rd. 388 Bridge 20 0 1 13 8.05 0.1 1 206021 DE 220-L04 Killen Pond Killen Pond at Killen Pond Rd. 1 0 1 1 I.D. 0.0 3 206691 DE 220-L04 Killen Pond Killen Pond at Killen Pond Rd. 4 0 1 3 I.D. 0.0 3 206361 DE 220-L05 Mccauley Pond McCauley Pond near spillway 20 0 1 13 7.9 0.1 1 90 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Lower Naamans Creek 101041 DE 230-001-01 Including Its Tributaries Rt. 13A 17 1 1 8 I.D. 0.0 3 Upper Naamans Creek Including North Br. And 101021 DE 230-001-02 South Br. Naamans Creek at Naamans Road 20 1 1 9 I.D. 0.0 3 Upper Naamans Creek Including North Br. And 101031 DE 230-001-02 South Br. Naamans Creek South Branch 19 0 1 9 I.D. 0.0 3 304011 DE 240-001 Lower Nanticoke River Sharptown 20 0 1 11 4.7 0.3 5 304021 DE 240-001 Lower Nanticoke River Woodland Ferry 17 0 1 9 I.D. 0.0 3 304031 DE 240-001 Lower Nanticoke River Rt. 13A Bridge 17 0 1 9 I.D. 0.0 3 304041 DE 240-001 Lower Nanticoke River Middleford Bridge 20 0 1 11 6.59 0.1 1 Bridgeville Branch at US Rt. 13 304051 DE 240-001 Lower Nanticoke River Bridge 5 0 1 2 I.D. 0.0 3 304071 DE 240-001 Lower Nanticoke River Buoy 45 State Line 20 1 1 11 4.5 0.3 5 304091 DE 240-001 Lower Nanticoke River Buoy 51 (Conf. Broad Creek) 20 0 1 11 5 0.1 5 304101 DE 240-001 Lower Nanticoke River Buoy 57 17 0 1 9 I.D. 0.0 3 304141 DE 240-001 Lower Nanticoke River Buoy 65 17 1 1 9 I.D. 0.0 3 304151 DE 240-001 Lower Nanticoke River Buoy 66 (Conf DuPont Gut) 20 1 1 11 4.6 0.1 5 304171 DE 240-001 Lower Nanticoke River Buoy 68 17 1 1 9 I.D. 0.0 3 304461 DE 240-001 Lower Nanticoke River Seaford STP Discharge 20 0 1 11 4.6 0.1 5 304471 DE 240-001 Lower Nanticoke River Rt. 13 Bridge 20 0 1 11 5.525 0.1 1 Herring Run at Rt. 20 Bridge 304621 DE 240-001 Lower Nanticoke River before entering Williams Pond 5 0 1 2 I.D. 0.0 3 See Cont. Mon. 304191 DE 240-002 Upper Nanticoke River Rd. 545 Mainstem Nanticoke Results 1 51 6.38 0.1 1 304291 DE 240-002 Upper Nanticoke River Nanticoke @ Rt. 600 Bridge 19 0 1 10 7.15 0.1 1 Clear Brook above DE Rt. 18 304371 DE 240-003 Clear Brook Branch Bridge 4 2 5 1 I.D. 0.0 3 Clear Brooks, Bucks Branch at Rd. 304381 DE 240-003 Clear Brook Branch 546 7 0 1 3 I.D. 0.0 3 304571 DE 240-003 Clear Brook Branch Clear Brook at US Rt. 13 5 2 5 2 I.D. 0.0 3 William H. Newton Ditch at Rt. 46 304631 DE 240-003 Clear Brook Branch Bridge 211------91 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment
Deep Creek above Concord Pond, 304591 DE 240-004 Deep Creek Branch near Old Furnace at Rd. 46 5 1 1 2 I.D. 0.0 3 Deep Creek above Concord Pond, near Cokesbury Church at DE Rt. 304601 DE 240-004 Deep Creek Branch 18 5 0 1 2 I.D. 0.0 3
304641 DE 240-004 Deep Creek Branch Baker Mill Branch at Rt. 483 Bridge 5 0 1 2 I.D. 0.0 3 316011 DE 240-005 Gravelly Branch Rd. 525 Gravelly Branch 25 0 1 16 6.745 0.0 1 Gravelly Branch downstream of the outlet of Collins Pond at Rt. 404 316021 DE 240-005 Gravelly Branch Bridge 5 0 1 2 I.D. 0.0 3
Gravelly Branch at west edge of 316031 DE 240-005 Gravelly Branch Redden State Park, Rd. 565 Bridge 5 0 1 2 I.D. 0.0 3 304251 DE 240-006 Bridgeville Branch Bridgeville Branch At Us Rt 13a 6 0 1 6 I.D. 0.0 3 Bridgeville Branch at DE Rt. 404 304271 DE 240-006 Bridgeville Branch Bridge 5 0 1 2 I.D. 0.0 3 Bridgeville Branch at Rd. 564 304611 DE 240-006 Bridgeville Branch Bridge 5 1 1 2 I.D. 0.0 3 304441 DE 240-007 Gum Branch Gum Branch at Rd. 487 Bridge 5 0 1 2 I.D. 0.0 3 304531 DE 240-007 Gum Branch Gum Branch at Rd. 485 Bridge 5 0 1 2 I.D. 0.0 3 Lewes Creek, Chapel Branch at Rt. 304451 DE 240-008 Lewes Creek 20 5 0 1 2 I.D. 0.0 3 Lewes Creek, Chapel Branch at 304541 DE 240-008 Lewes Creek Rd. 547 5 2 5 2 I.D. 0.0 3 Lewes Creek, Butler Mill Branch at 304551 DE 240-008 Lewes Creek Rd. 80 Bridge 5 0 1 2 I.D. 0.0 3 Lewes Creek, Butler Mill Branch, 304561 DE 240-008 Lewes Creek Horse Pen Branch at Rd. 20 5 0 1 2 I.D. 0.0 3 Gum Branch, Upper 304661 DE 240-010 Nanticoke River Gum Branch at RT 591 2 0 1 1 I.D. 0.0 3 Lewes Creek, Butler Mill Branch, downstream of Craig Pond at Rd. 304301 DE 240-L01 Craigs Pond 542A 5 0 1 2 I.D. 0.0 3 92 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment 304311 DE 240-L02 Concord Pond Concord Pond Overflow 20 0 1 11 6.4 0.0 1 Tyndall Branch at Rt. 484 Bridge at 304651 DE 240-L02 Concord Pond spillway of Fleetwood Pond 4 0 1 1 I.D. 0.0 3 304321 DE 240-L04 Williams Pond Williams Pond Overflow 20 0 1 11 7.7 0.1 1 Williams Pond, middle of the pond 304581 DE 240-L04 Williams Pond at US Rt. 13 5 0 1 2 I.D. 0.0 3 Hearns Pond, 100 yrd above 304411 DE 240-L05 Hearns Pond spillway 5 0 1 2 I.D. 0.0 3 Pocomoke River, Headwaters To Maryland 313011 DE 250-001 State Line Rd. 419 20 0 1 9 I.D. 0.0 3 Pocomoke River, Headwaters To Maryland 313041 DE 250-001 State Line Pocomoke River at Rt. 417 Bridge 12 0 1 6 I.D. 0.0 3 Pocomoke River, Headwaters To Maryland 313051 DE 250-001 State Line Pocomoke River at Rt. 30 Bridge 12 0 1 6 I.D. 0.0 3 Pocomoke River, Tributaries From The Headwaters To 313021 DE 250-002 Maryland Gums Branch at Rt.413 Bridge 12 0 1 6 I.D. 0.0 3 Pocomoke River, Tributaries From The Headwaters To 313031 DE 250-002 Maryland Cyprus Branch at Rd. 60 Bridge 12 1 1 6 I.D. 0.0 3 Red Clay Creek From Stanton, Rt. 4 (USGS gage 103011 DE 260-001 Pennsylvania State Line 01480015) 24 0 1 11 7.5 0.2 1 Red Clay Creek From Wooddale, Rt. 8 (USGS gage 103031 DE 260-001 Pennsylvania State Line 01480000) 22 0 1 10 6.8 0.2 1 Red Clay Creek From 103041 DE 260-001 Pennsylvania State Line Ashland, Rd. 258a 24 0 1 11 7.15 0.2 1
Burroughs Run From 103061 DE 260-002 Pennsylvania State Line Run Burrough's Run Confluence 22 0 1 10 7.6325 0.1 1 107031 DE 270-001-01 Lower Red Lion Creek Rt. 9 Bridge 20 3 5 9 I.D. 0.0 3 107061 DE 270-001-01 Lower Red Lion Creek Uppertwin 5 0 1 2 I.D. 0.0 3
93 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Upper Red Lion Creek, 107011 DE 270-001-02 Headwaters To Route 13 Rt. 7 20 1 1 9 I.D. 0.0 3 Upper Red Lion Creek, 107041 DE 270-001-02 Headwaters To Route 13 Red Lion Rd. 7 1 1 4 I.D. 0.0 3 Upper Red Lion Creek, 107071 DE 270-001-02 Headwaters To Route 13 Govenor Lea 7 0 1 4 I.D. 0.0 3 From The Headwaters Of Chapel Br. To The 308051 DE 280-001-01 Confluence Of Guinea Creek at Rt. 298 Bridge 20 0 1 10 5.415 10.0 1 From The Headwaters Of Chapel Br. To The 308431 DE 280-001-01 Confluence Of Guinea Creek at Rt. 24 Bridge 10 0 1 5 I.D. 0.0 3 308021 DE 280-002 Love Creek Love Creek at Rt. 24 Bridge 10 0 1 5 I.D. 0.0 3 308291 DE 280-002 Love Creek Love Creek, Rd. 277 20 0 1 10 5.69 0.1 1 Bundick's Branch at Rt. 23 Bridge 308371 DE 280-002 Love Creek (Trib. Of Love Creek) 8 0 1 3 I.D. 0.0 3
308411 DE 280-002 Love Creek Goslee Creek at Rt. 285 A Bridge 6 0 1 3 I.D. 0.0 3
308421 DE 280-002 Love Creek Bundicks Branch at Rt. 286 Bridge 10 0 1 5 I.D. 0.0 3 306071 DE 280-E01 Rehoboth Bay Buoy 3, Rehoboth Bay 20 0 1 10 5.05 27.1 1 306091 DE 280-E01 Rehoboth Bay Buoy 7, Rehoboth Bay 20 0 1 10 4.61 28.6 5 306111 DE 280-E01 Rehoboth Bay Massey's Ditch at Buoy 17 20 0 1 10 5.195 28.5 1 308031 DE 280-L01 Burton Pond Burton Pond, Rd. 24 20 0 1 10 6.6 0.3 1 205011 DE 290-001-01 Lower St. Jones River St. Jones @ Bowers 8 3 5 4 I.D. 0.0 3 205031 DE 290-001-01 Lower St. Jones River 2.75 miles from mouth 8 3 5 4 I.D. 0.0 3 205041 DE 290-001-01 Lower St. Jones River Barkers Landing 15 4 5 6 I.D. 0.0 3 205061 DE 290-001-01 Lower St. Jones River Gravel Pit 8 4 5 4 I.D. 0.0 3 205091 DE 290-001-02 Upper St. Jones River Rt. 10 Bridge 15 3 5 6 I.D. 0.0 3 205131 DE 290-001-02 Upper St. Jones River Rt. 13 St. Jones 8 0 1 4 I.D. 0.0 3 205571 DE 290-001-02 Upper St. Jones River Division Street 15 1 1 6 I.D. 0.0 3 205241 DE 290-002 Isaac Branch Rt. 13 North Moores Lake 15 0 1 6 I.D. 0.0 3 205321 DE 290-002 Isaac Branch Isaac Br @ Rd. 203 6 0 1 4 I.D. 0.0 3 205601 DE 290-002 Isaac Branch Wyoming Lake 6 0 1 4 I.D. 0.0 3 205151 DE 290-003 Fork Branch Rd. 69 State College 15 8 5 6 I.D. 0.0 3 94 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment 205171 DE 290-003 Fork Branch Fork Branch Rd. 156 8 1 1 4 I.D. 0.0 3 205261 DE 290-004 Tidbury Branch Tidbury Creek @ Rd. 125 8 2 5 4 I.D. 0.0 3 205581 DE 290-004 Tidbury Branch Tidbury Creek at Rd. 105 4 0 1 2 I.D. 0.0 3 205591 DE 290-004 Tidbury Branch Voshell Pond @ Rd. 360 8 0 1 4 I.D. 0.0 3 205181 DE 290-L01 Moores Lake Rt. 13 Alt. Moores Lake 15 1 1 6 I.D. 0.0 3 205231 DE 290-L01 Moores Lake Isaac Branch at Rt. 203 201------205191 DE 290-L02 Silver Lake Silver Lake Spillway 15 0 1 6 I.D. 0.0 3 205201 DE 290-L02 Silver Lake Silver Lake St Street 8 0 1 4 I.D. 0.0 3 205211 DE 290-L03 Derby Pond Derby Pond at Rt. 13A 15 0 1 6 I.D. 0.0 3 102041 DE 300-001-01 Lower Shellpot Creek Cherry Island at Rd. 501 Bridge 20 1 1 9 I.D. 0.0 3 102011 DE 300-001-02 Upper Shellpot Creek Rt. 13 Bridge 20 1 1 9 I.D. 0.0 3 Shellpot Creek, at Rt. 13 Bud 102051 DE 300-001-02 Upper Shellpot Creek (Market Street) Bridge 8 0 1 4 I.D. 0.0 3
102061 DE 300-001-02 Upper Shellpot Creek Matson Run at Miller Road Bridge 7 0 1 3 I.D. 0.0 3 Turkey Run at Weldin Road (Rt. 102071 DE 300-001-02 Upper Shellpot Creek 215) Bridge 6 0 1 3 I.D. 0.0 3 Shellpot Creek at Carr Road 102081 DE 300-001-02 Upper Shellpot Creek Bridge 7 0 1 4 I.D. 0.0 3 Shellpot Creek at Foulk Road (Rt. 102091 DE 300-001-02 Upper Shellpot Creek 261) Bridge 7 0 1 4 I.D. 0.0 3 201011 DE 310-001 Smyrna River Mill Creek Rt. 13 7 0 1 3 I.D. 0.0 3 201031 DE 310-001 Smyrna River Mill Creek @ Rt. 6 7 0 1 3 I.D. 0.0 3 201041 DE 310-001 Smyrna River Rt. 9 Fleming's Landing 20 4 5 7 I.D. 0.0 3 201051 DE 310-001 Smyrna River Rt. 485 Bridge 20 2 5 7 I.D. 0.0 3 201021 DE 310-002 Mill Creek Rt. 137 Bridge 20 1 1 7 I.D. 0.0 3 201151 DE 310-002 Mill Creek Mill Creek Rt. 300 7 0 1 3 I.D. 0.0 3 Tributaries From The Headwaters To The 201161 DE 310-003 Confluence With Rt. 482 Bridge 20 0 1 7 I.D. 0.0 3 Tributaries From The Headwaters To The 201171 DE 310-003 Confluence With Sawmill Br @ Long bridge 7 2 5 3 I.D. 0.0 3
95 Table III-4 2004 Station Summary Statistics Minimum DO Attainment Average DO Attainment
Station Segment Segment Description Station Location # samples # samples below min Min DO Attainment # samples 10th %tile UCL Average Salinity Avg. Attainment Tributaries From The Headwaters To The 201181 DE 310-003 Confluence With Duck Creek Rd 7 0 1 3 I.D. 0.0 3 Tributaries From The Headwaters To The 201201 DE 310-003 Confluence With Green Spring Br Rd 41 7 0 1 3 I.D. 0.0 3 Tributaries From The Headwaters To The 201211 DE 310-003 Confluence With PawPaw Br Rd 483 7 0 1 3 I.D. 0.0 3 Tributaries From The Headwaters To The 201221 DE 310-003 Confluence With Providence Creek 483 7 1 1 3 I.D. 0.0 3 Lake Como & Duck Creek 201141 DE 310-L01 Pond Lake Como 100 yards above 7 0 1 3 I.D. 0.0 3 Lake Como & Duck Creek 201191 DE 310-L01 Pond mid Duck Creek Pond 7 0 1 3 I.D. 0.0 3 White Clay Creek From 105011 DE 320-001 Pennsylvania State Line Stanton, Old Rt. 7 Bridge 24 0 1 11 7.015 0.1 1 White Clay Creek From 105031 DE 320-001 Pennsylvania State Line Chambers Rock Rd. 24 0 1 11 7.6 0.1 1 White Clay Creek From DE Park Race Track (USGS gage 105151 DE 320-001 Pennsylvania State Line 01479000) 22 0 1 10 6.69 0.1 1 Mill Creek Confluence, Above Rt. 4 105071 DE 320-002 Mill Creek (DE Park) 22 0 1 10 6.555 0.1 1 105171 DE 320-002 Mill Creek McKee Lane 3 0 1 2 I.D. 0.0 3 Pike Creek Confluence, Upper 105101 DE 320-003 Pike Creek Pike Creek Rd. 22 0 1 10 8.22 0.1 1 Middle Run Confluence, Possum 105131 DE 320-004 Middle Run Park Rd. 22 0 1 10 8.35 0.1 1
96 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment 109091 DE 010-001-01 Lower Appoquinimink River Confluence with Delaware River 20 2.52 5 18 0.242 5 19 113 5 -- 109121 DE 010-001-01 Lower Appoquinimink River Rt. 9 Bridge 20 2.3 5 18 0.262 5 19 380 5 -- 109141 DE 010-001-01 Lower Appoquinimink River Mouth of East Br. Drawyer Creek 20 2.36 5 18 0.246 5 19 410 5 -- Upper Appoquinimink River - 109041 DE 010-001-02 Odessa Rt. 13 Bridge 20 3.14 5 18 0.264 5 19 833 5 -- Upper Appoquinimink River - 109051 DE 010-001-02 Odessa Rt. 299 Bridge, Odessa 20 2.4265 5 18 0.267 5 19 600 5 -- Upper Appoquinimink River - 109151 DE 010-001-02 Odessa Above West Br. Drawyer Creek 20 2.384 5 18 0.246 5 19 420 5 -- Upper Appoquinimink River - 109171 DE 010-001-02 Odessa MOT Gut (Appo Gut) - West Bank 20 2.377 5 18 0.25 5 19 590 5 -- Lower Appoquinimink River - 109071 DE 010-001-03 Drawyer Creek Drawyer Creek, Rt 13 20 3.002 5 18 0.302 5 19 460 5 -- Lower Appoquinimink River - Tributary of Drawyer Creek at Marl 109201 DE 010-001-03 Drawyer Creek Pit Rd. 14 4.3 5 12 0.297 5 9 ID 3 -- Lower Appoquinimink River - Drawyer Creek above Shallcross 109211 DE 010-001-03 Drawyer Creek Lake at Ceder Lane Rd. 9ID38ID39ID3-- Upper Appoquinimink - Downstream of Wiggins Mill Pond 109221 DE 010-002-01 Wiggins Mill Pond Branch at Rt. 71 8ID37ID38ID3-- Upper Appoquinimink - Upstream of Wiggins Mill Pond at 109231 DE 010-002-01 Wiggins Mill Pond Branch Grears Corner Rd. 8ID38ID38ID3-- Upper Appoquinimink, Deep Creek To Confluence With Deep Creek Branch at Rt. 71 109081 DE 010-002-02 Silver Bridge (Middletown Nat 5 ID 3 4 ID 3 -- -- 3 -- Upper Appoquinimink, Deep Creek To Confluence With 109241 DE 010-002-02 Silver Deep Creek at DE Rt. 15 7ID37ID37ID3-- Upper Appoquinimink, Deep Creek To Confluence With Deep Creek above Silver Lake at 109251 DE 010-002-02 Silver Rt. 71 9ID38ID39ID3--
109131 DE 010-L01 Noxontown Pond Noxontown Pond Overflow, Rd 38 20 2.898 5 18 0.088 5 19 63 1 -- 109031 DE 010-L02 Silver Lake Silver Lake Overflow, Rd 442 19 5.027 5 17 0.055 5 18 70 1 -- 109191 DE 010-L03 Shallcross Lake Shallcross Lake Overflow 20 3.663 5 18 0.053 5 19 93 1 -- 114011 DE 020-001 Lower Army Creek Rt. 9 20 1.8 5 19 0.202 5 19 600 5 -- 97 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment No name trib. At Rt. 13 near Airport 114041 DE 020-001 Lower Army Creek Ind. Park 4ID34ID34ID3-- 114021 DE 020-002 Upper Army Creek Rt. 13 Bridge 19 2.849 5 18 0.149 5 19 733 5 -- No name trib. At Rt. 40 near Airport 114051 DE 020-002 Upper Army Creek Ind. Park 3ID33ID33ID3-- 110031 DE 030-001 Lower Blackbird Creek Blackbird Landing 7ID37ID37ID3-- 110041 DE 030-001 Lower Blackbird Creek Rt. 9 Taylors Bridge 20 2.289 5 18 0.298 5 20 340 5 -- 110011 DE 030-002 Upper Blackbird Creek Blackbird Station 6ID36ID36ID3-- 110021 DE 030-002 Upper Blackbird Creek Rt. 13 (Northern Branch 20 2.103 5 18 0.17 5 20 2000 5 -- 110101 DE 030-002 Upper Blackbird Creek Rd. 472 7ID37ID37ID3-- 110111 DE 030-002 Upper Blackbird Creek Barlow Br 7ID37ID37ID3-- All Tributaries From The Headwaters To The 110091 DE 030-003 Confluence With Beaver Br. Rd 456 7ID37ID37ID3-- 104011 DE 040-001 Lower Brandywine River Foot Bridge 22 3.5 5 22 0.149 5 22 400 5 -- Upper Brandywine Creek, From State Line To Rd. 279 Bridge (USGS guage 104021 DE 040-002 Wilmington 01481500) 22 3.283 5 22 0.139 5 22 380 5 -- Upper Brandywine Creek, From State Line To 104051 DE 040-002 Wilmington Smith Bridge 22 3.384 5 22 0.145 5 22 160 1 1 Lower Broad Creek, Including Collins & Culvert Broad Creek At Road 28a, West 307021 DE 050-001 Ditch, Holly Bridge 1ID30ID31ID3-- Lower Broad Creek, Including Collins & Culvert Meadow Branch at Road 501 307151 DE 050-001 Ditch, Holly Bridge 4ID33ID34ID3-- Portsville Pond on Tussocky Branch of Broad Creek, at county 307061 DE 050-002 Tussocky Branch road 496 5ID34ID35ID3-- Tussocky Branch at Route 24 307291 DE 050-002 Tussocky Branch bridge 5ID34ID35ID3-- 307331 DE 050-002 Tussocky Branch Turkey Branch at Rt. 495 Bridge 1ID31ID31ID3-- Beaver Dam Branch at Rd. 447 307111 DE 050-004 Chipman Pond Branch Bridge (below Wileys Pond) 5ID34ID35ID3-- 98 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Chipman Pond Branch at Road 467 Bridge 9 below confluence of Mirey Branch and Elliot Pond 307121 DE 050-004 Chipman Pond Branch Branch 5ID34ID35ID3-- Chipman Pond Branch at Rt. 465 Bridge, down stream of Chipman 307341 DE 050-004 Chipman Pond Branch Pond Spillway 5ID34ID35ID3-- James Branch Including Pepper Pond Br., Hitch Pond Trap Pond on Hitch Pond Branch 307081 DE 050-005-01 Br., Etc. at County Road 449 4ID34ID34ID3-- James Branch Including Pepper Pond Br., Hitch Pond Pepper Pond Branch at Rt. 24 307281 DE 050-005-01 Br., Etc. Bridge 5ID34ID35ID3-- James Branch Including Pepper Pond Br., Hitch Pond 307351 DE 050-005-01 Br., Etc. Grays Branch at Rt. 62 Bridge 5ID34ID35ID3-- James Branch Including Pepper Pond Br., Hitch Pond 307361 DE 050-005-01 Br., Etc. Pepper Branch at Rt 62 Bridge 5ID34ID35ID3-- James Branch Including Pepper Pond Br., Hitch Pond 307381 DE 050-005-01 Br., Etc. James Branch at Rd. 451 Bridge 5ID34ID35ID3-- James Branch Including Pepper Pond Br., Hitch Pond 307391 DE 050-005-01 Br., Etc. James Branch on Rt. 24 Bridge 5ID34ID35ID3-- 304671 DE 050-006-03 Raccoon Prong Raccoon Prong at RT 66 3ID33ID33ID3--
307221 DE 050-006-03 Raccoon Prong Thomson Branch at Rd. 72 Bridge 4ID33ID34ID3-- 307371 DE 050-006-03 Raccoon Prong Raccoon Prong at Rd. 62 Bridge 3ID32ID33ID3-- Tussocky Branch at Count Road 307101 DE 050-L02 Tussock Pond 494, southwest of Laurel 5ID34ID35ID3-- Horseys Pond 50 Yards Above 307171 DE 050-L03 Horseys Pond Spillway 50% R.B. 20 4.89 5 18 0.132 5 19 57 1 1 307011 DE 050-L04 Records Pond Records Pond Overflow 20 5.12 5 18 0.098 5 19 290 5 5 307401 DE 050-L04 Records Pond Records Pond Spillway 4ID33ID34ID3-- 99 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment 307411 DE 050-L04 Records Pond Ward's Branch at 64 1ID31ID31ID3-- Chipman Pond, 2/3 distance from Chipman Pond & Wileys Spillway to inflow stream 307131 DE 050-L05 Pond confluence 5ID34ID35ID3-- James Branch, outflow of Trussum 307091 DE 050-L06 Trussum Pond Pond at Rd. 72 Bridge 5ID34ID35ID3-- Trap Pond, 200 yard above 307181 DE 050-L07 Trap Pond Spillway 5ID34ID35ID3-- Racoon Prong at Racoon Pond 307201 DE 050-L08 Raccoon Pond Spillway (Road 72 Bridge) 3ID33ID33ID3-- 303041 DE 060-001 Lower Broadkill River Rt. 1 Bridge (Mainstem) 19 3.88 5 18 0.2325 5 19 633 5 -- 303061 DE 060-001 Lower Broadkill River 0.1 miles from mouth 8ID38ID37ID3-- 303081 DE 060-001 Lower Broadkill River 2.14 miles from mouth 8ID38ID37ID3-- 303171 DE 060-002 Beaverdam Creek Beaverdam Creek at Rd. 88 19 10.53 5 18 0.275 5 19 550 5 -- 303181 DE 060-002 Beaverdam Creek Beaverdam Creek at Rd. 259 19 13.2 5 18 0.458 5 19 600 5 -- 303211 DE 060-002 Beaverdam Creek Beaverdam Creek at Rd. 257 8ID38ID38ID3-- 303491 DE 060-002 Beaverdam Creek Beaverdam Creek at Rd. 293 3ID33ID33ID3-- 303031 DE 060-003 Upper Broadkill River Broadkill River at Rt. 5 Bridge 19 4.841 5 18 0.064 5 19 87 1 -- 303131 DE 060-003 Upper Broadkill River 9.86 miles from mouth 8ID38ID38ID3-- 303311 DE 060-004 Round Pole Branch Round Pole Branch at Rd. 88 18 3.68 5 17 0.175 5 18 560 5 -- 303011 DE 060-005 Ingram Branch Ingram Branch at Rd. 246 19 32.2 5 18 0.648 5 19 470 5 -- 303021 DE 060-005 Ingram Branch Ingram Branch at Rd. 248 19 13.933 5 18 0.253 5 19 767 5 -- 303241 DE 060-005 Ingram Branch Ingram Branch at Rd. 319 8ID38ID38ID3-- 303261 DE 060-005 Ingram Branch Ingram Branch S. of 245/246 8ID38ID38ID3-- Savannah Ditch 1/2 mile N. of 303281 DE 060-005 Ingram Branch Townsend discharge 8ID38ID38ID3-- 303481 DE 060-005 Ingram Branch Ingrams Branch Rt. 30 9ID38ID39ID3-- 303341 DE 060-006 Pemberton Branch Pemberton Branch at Rt. 30 19 4.741 5 18 0.065 5 19 567 5 -- 303051 DE 060-007-01 Lower Red Mill Branch Red Mill Pond at Rt. 1 19 2.938 5 18 0.218 5 19 140 1 -- 303406 DE 060-007-02 Martin Branch Martins Br. at Rt. 30 8ID38ID38ID3-- 303231 DE 060-L01 Red Mill Pond Trib. to Red mill Pond 19 3.81 5 18 0.171 5 19 250 5 -- 303351 DE 060-L02 Waggamons Pond Waggamons Pond Outlet 19 4.733 5 18 0.07 5 19 53.5 1 -- Waples Pond & Reynolds 303331 DE 060-L03 Pond Waples Pond at Rt. 1 19 3.693 5 18 0.033 1 19 83 1 --
100 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Waples Pond & Reynolds 303381 DE 060-L03 Pond Sowbridge Branch at Rd. 212 19 3.989 5 18 0.061 5 19 260 5 -- 311041 DE 070-001 Bunting's Branch Rd. 54 17 5.89 5 16 0.206 5 16 1333 5 -- 301031 DE 080-001 Lower Cedar Creek Rt. 1 Bridge 20 4.262 5 18 0.136 5 20 340 5 -- 301091 DE 080-001 Lower Cedar Creek Rt. 36 Bridge 20 2.274 5 18 0.294 5 20 210 5 1 Upper Cedar Creek, Headwaters To Cedar Creek 301011 DE 080-002 Mill Pond Clendaniel Pond outfall @ Rd. 38 7ID36ID37ID3-- Upper Cedar Creek, Headwaters To Cedar Creek 301021 DE 080-002 Mill Pond Rd. 212 20 3.58 5 18 0.082 5 20 43 1 -- Upper Cedar Creek, Headwaters To Cedar Creek 301041 DE 080-002 Mill Pond Cubbage Pond outfall @ Rd. 38 7ID36ID37ID3-- Upper Cedar Creek, Headwaters To Cedar Creek 301051 DE 080-002 Mill Pond Greentop Rd. 7ID36ID37ID3-- Upper Cedar Creek, Headwaters To Cedar Creek Upstream side of Rt. 113 upstream 301061 DE 080-002 Mill Pond of Hudson Pond 7ID36ID37ID3-- Upper Cedar Creek, Headwaters To Cedar Creek 301071 DE 080-002 Mill Pond Church Br. @ Rd. 214 7ID36ID37ID3-- Upper Cedar Creek, Headwaters To Cedar Creek Middle of Cedar Creek Mill Pond @ 301151 DE 080-002 Mill Pond Rd. 224 7ID36ID37ID3-- Upper Cedar Creek, Headwaters To Cedar Creek 301161 DE 080-002 Mill Pond Middle of Hudson Pond 7ID36ID36ID3-- 301141 DE 080-003 Slaughter Creek Slaughter Creek @ Rd. 224 7ID36ID37ID3-- Chesapeake And Delaware Canal From Maryland Line 108021 DE 090-001 To Delaware St. Georges Bridge 20 2.403 5 18 0.188 5 20 67.5 1 --
101 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Chesapeake And Delaware Canal From Maryland Line 108031 DE 090-001 To Delaware Summit Bridge 20 2.448 5 18 0.16 5 20 53 1 -- 108111 DE 090-L01 Lums Pond Lums Pond Boat Ramp 20 1.658 5 18 0.083 5 20 88.5 1 -- Cypress Branch at Delaney Corner 112011 DE 100-001 Cypress Branch (Rt. 40) Bridge 9ID39ID39ID3-- 112021 DE 100-001 Cypress Branch Sewell Branch at Rd. 95 19 2.982 5 19 0.2755 5 19 600 5 -- Cypress Branch at Morris Road 112581 DE 100-001 Cypress Branch (Rt. 477) Bridge 9ID39ID39ID3-- Sewell Branch at Blackson Church 112591 DE 100-002 Sewell Branch Road (Rt. 131) Bridge 10 2.162 5 10 0.343 5 10 500 5 -- Jordan Branch at Underwoods 112601 DE 100-002 Sewell Branch Corner Road (Rt. 94) Bridge 10 2.288 5 10 0.195 5 10 250 5 --
112031 DE 100-003 Gravelly Run Gravelly Run at Stilltown Rd., MD 19 2.131 5 19 0.28 5 19 860 5 -- Gravelly Run at Lion Hope Road ( 112611 DE 100-003 Gravelly Run Rt. 143) Bridge 10 1.734 5 10 0.11 5 10 205 5 -- Gravelly Run at Fords Corner Road 112621 DE 100-003 Gravelly Run (Rt.98) Bridge 10 1.443 5 10 0.177 5 10 77 1 -- Muddy Bottom Ditch at Chapel 112631 DE 100-003 Gravelly Run Road ( Rt. 97) Bridge 10 1.488 5 10 0.162 5 10 163 1 -- 207081 DE 110-001 Tappahanna Ditch Tappahanna Ditch at Rd. 222 19 1.807 5 19 0.158 5 19 370 5 -- Tappahanna Ditch at RT. 8 Bridge 207121 DE 110-001 Tappahanna Ditch near Green Brier 10 1.202 5 10 0.174 5 10 340 5 -- Tappahanna Ditch at Tuxward 207131 DE 110-001 Tappahanna Ditch Road (Rt. 220) Bridge 10 1.457 5 10 0.205 5 10 167 1 -- 207091 DE 110-002 Culbreth Marsh Ditch Culbreth Marsh at Rd. 210 19 2.53 5 19 0.214 5 19 600 5 -- Culbreth Marsh Ditch at Lucks 207141 DE 110-002 Culbreth Marsh Ditch Drive (Rt. 223) Bridge 10 1.573 5 10 0.198 5 10 380 5 --
Culbreth Marsh Ditch at Old Point 207151 DE 110-002 Culbreth Marsh Ditch School Road (Rt. 215) Bridge 9ID39ID39ID3-- 207021 DE 110-003 Cow Marsh Creek Cow Marsh Creek at Rd. 208 19 2.27 5 19 0.123 5 19 190 5 -- Cow Marsh Creek at Hollering Hills 207181 DE 110-003 Cow Marsh Creek Road (Rt. 213) Bridge 10 1.288 5 10 0.098 5 10 210 5 -- 102 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Cow Marsh Creek at Willow Grow 207191 DE 110-003 Cow Marsh Creek Road Rt. 10) Bridge 10 0.923 1 10 0.092 5 10 80 1 --
207011 DE 110-L01 Mud Mill Pond Mud Mill Pond At Road 207 Bridge 2ID32ID32ID3-- 207111 DE 110-L01 Mud Mill Pond White Marsh Branch at Rd. 268 17 4.43 5 17 0.222 5 17 300 5 -- Mud Millpond Outflow at Mud Mill 207161 DE 110-L01 Mud Mill Pond Road (Rt. 207) Bridge 10 1.868 5 10 0.163 5 10 107 1 --
Tidy Island Creek Bridge at continuation of Westville Road (Rt. 207171 DE 110-L01 Mud Mill Pond 206) in MD (inflow to Mud Millpond) 10 1.591 5 10 0.148 5 10 280 5 -- 106011 DE 120-001 Lower Christina River Rt. 13/Rt. 9 Bridge 21 3.04 5 21 0.148 5 21 330 5 -- Conrail Bridge (USGS tide gage 106291 DE 120-001 Lower Christina River 01481602) 21 3.13 5 21 0.15 5 21 270 5 -- Mid Christina River, Between White Clay Creek And Rt. 141, Newport (USGS tide gage 106021 DE 120-002 Brandywine 01480065) 21 3.155 5 21 0.1375 5 21 600 5 -- Christina River Tributaries From Smalleys Pond Leatherinans Run at Old Baltimore 106321 DE 120-003-02 Overflow To Pike Road Bridge 7ID37ID37ID3-- Christina River at Old Walter Road 106111 DE 120-004-01 Lower Christina Creek (Rd 346) Bridge 1ID31ID31ID3-- Old Baltimore Pike, Below Newark 106141 DE 120-004-01 Lower Christina Creek (USGS guage 01478000) 21 2.83 5 21 0.089 5 21 575 5 -- Christina River at Old Walter Road 106331 DE 120-004-01 Lower Christina Creek (Rd 346) Bridge 6ID36ID36ID3-- 106341 DE 120-004-02 Belltown Run Belltown Run at Rt. 72 Bridge 7ID37ID37ID3-- 106191 DE 120-006 Upper Christina Creek Rt. 273, Above Newark 22 2.639 5 22 0.054 5 22 733 5 -- Little Mill creek, Atlantic Avenue 106281 DE 120-007-01 Little Mill Creek (USGS Gage 01480095) 21 2.08 5 21 0.075 5 21 600 5 -- 106031 DE 120-L01 Smalleys Pond Smalley's Dam Spillway 22 1.828 5 22 0.086 5 22 600 5 -- Beck's Pond outflow at Salem 106121 DE 120-L02 Becks Pond Church Rd. Bridge 1ID31ID31ID3-- Beck's Pond outflow at Salem 106351 DE 120-L02 Becks Pond Church Rd. Bridge 6ID36ID36ID3-- 103 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Outflow of Sunset Pond at Rt. 72 106131 DE 120-L03 Sunset Pond Bridge 1ID31ID31ID3-- Inflow to the Sunset Pond at 106361 DE 120-L03 Sunset Pond Corporate Blvd. 7ID37ID37ID3-- The middle of Foot Bridge on the 106371 DE 120-L03 Sunset Pond Sunset Pond 7ID37ID37ID3-- Outflow of Sunset Pond at Rt. 72 106381 DE 120-L03 Sunset Pond Bridge 6ID36ID36ID3-- 111011 DE 130-001 Lower Dragon Run Creek Rt. 9 Bridge 21 1.274 5 19 0.187 5 21 35 1 -- 111021 DE 130-001 Lower Dragon Run Creek Rd. 378 7ID37ID37ID3-- 111031 DE 130-002 Upper Dragon Run Creek Rt. 13 Bridge (flow at Rd. 407) 17 2.22 5 15 0.123 5 17 400 5 -- 111041 DE 130-002 Upper Dragon Run Creek Rd. 407 7ID37ID37ID3-- 111081 DE 130-002 Upper Dragon Run Creek Rt. 71 7ID37ID37ID3-- Beaver Dam Ditch at Rt. 368 310121 DE 140-001 White Creek Bridge 19 5.49 5 18 0.128 5 18 667 5 -- White Creek at the mouth of 312011 DE 140-001 White Creek Assawoman Canal 18 0.952* 5 17 0.021* 5 19 153 5 -- Bundick's Branch at Rt. 23 Bridge 308361 DE 140-002 Blackwater Creek (Trib. Of Love Creek) 20 5.183 5 18 0.118 5 19 967 5 -- Pepper Creek And Tributaries, Including Vines 308091 DE 140-003 Creek, Mccrays Pepper Creek at Rt. 26 23 2.46 5 21 0.13 5 19 1033 5 -- Pepper Creek And Tributaries, Including Vines 308101 DE 140-003 Creek, Mccrays Vines Creek at Rt. 26 Bridge 10 2.52 5 9 ID 3 10 100 1 -- Pepper Creek And Tributaries, Including Vines 308151 DE 140-003 Creek, Mccrays Vines Creek Rd. 382 11 3.19 5 10 0.103 5 11 310 5 1 Pepper Creek And Tributaries, Including Vines 308351 DE 140-003 Creek, Mccrays Vines Creek Rd. 54 10 6.21 5 9 ID 3 10 200 5 -- Pepper Creek And Tributaries, Including Vines 308381 DE 140-003 Creek, Mccrays Vines Creek @ Rd. 376 10 3.3 5 9 ID 3 10 570 5 --
104 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Pepper Creek And Tributaries, Including Vines Deep Hole Branch at Rt. 382 308461 DE 140-003 Creek, Mccrays Bridge 12 7.44 5 12 0.22 5 11 1133 5 -- 306181 DE 140-004 Indian River Buoy 49, Indian River 20 2.67 5 17 0.275 5 19 280 5 1 306191 DE 140-004 Indian River Buoy 55, Indian River 20 3.29 5 17 0.221 5 19 350 5 1 Swan Creek at Rt. 24 Bridge, 308061 DE 140-005 Swan Creek outflow from Longwood Pond 10 5.26 5 8 ID 3 10 600 5 1 308301 DE 140-005 Swan Creek Swan Creek, Rd. 304 20 5.16 5 18 0.076 5 19 1567 5 -- 308341 DE 140-005 Swan Creek Swan Creek at Rt. 297 Bridge 19 2.983 5 18 0.0585 5 18 1133 5 -- Stockley Branch, Cow Bridge 308141 DE 140-006 Stockley Branch Branch at Rd. 432 10 4.08 5 8 ID 3 10 1033 5 -- 308281 DE 140-006 Stockley Branch Cow Bridge Branch Rd. 48 20 3.34 5 18 0.089 5 19 440 5 -- Mirey Branch, Including Sheep Pen Ditch, And 319011 DE 140-009 Narrow Drain Sheep Pen Ditch at Rt. 328 Bridge 10 5.51 5 8 ID 3 10 1200 5 -- Mirey Branch, Including Sheep Pen Ditch, And 319101 DE 140-009 Narrow Drain Mirey Branch at Rt. 318 Bridge 10 6.14 5 8 ID 3 10 1267 5 -- 308181 DE 140-010 Betts Pond Branch Shoals Branch at Rt. 412 Bridge 10 2.07 5 8 ID 3 10 54 1 -- 308191 DE 140-010 Betts Pond Branch Phillips Ditch at Rt. 412 Bridge 10 3.187 5 8 ID 3 10 1233 5 --
308391 DE 140-010 Betts Pond Branch Long Drain Ditch at Rt. 433 Bridge 6ID34ID35ID3-- 306121 DE 140-E01 Lower Indian River Bay Buoy 20, Indian River Bay 18 0.188* 5 18 0.023* 5 19 7 1 1 306131 DE 140-E01 Lower Indian River Bay Buoy 26, Indian River Bay 18 0.474* 5 18 0.025* 5 19 5 1 1 306321 DE 140-E01 Lower Indian River Bay Indian River Intlet 10 0.128* 5 10 0.022* 5 10 6 1 1 306161 DE 140-E02 Upper Indian River Bay Buoy 38, Indian River 18 1.394* 5 18 0.014* 1 19 46 5 1 306331 DE 140-E02 Upper Indian River Bay Island Creek mouth 17 1.272* 5 17 0.015* 5 18 45 1 5 306341 DE 140-E02 Upper Indian River Bay Island Creek, upper third 17 1.496* 5 17 0.019* 5 18 40 1 -- 308071 DE 140-L01 Millsboro Pond Millsboro Dam Overflow 20 4.03 5 18 0.066 5 19 340 5 -- Stockley Branch, Cow Bridge 308271 DE 140-L01 Millsboro Pond Branch at Rd. 318 10 5.37 5 8 ID 3 10 600 5 -- Outflow of Betts Pond at Rt. 326 308201 DE 140-L02 Betts Pond Bridge 10 1.752 5 8 ID 3 10 181.5 1 -- Middle of Betts Pond at Rt. 113 308401 DE 140-L02 Betts Pond Bridge 10 2.266 5 8 ID 3 10 70 1 -- 105 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Outflow from the Ingram Pond at 308011 DE 140-L03 Ingram Pond Rt. 410 Bridge 10 1.927 5 8 ID 3 10 80 1 -- 308171 DE 140-L03 Ingram Pond Deephole Br. @ Rd. 382 1ID31ID31ID3-- 309011 DE 150-001 Iron Branch Iron Branch at Rt. 331 Bridge 10 2.64 5 8 ID 3 10 600 5 -- 309021 DE 150-001 Iron Branch Iron Branch at Rt. 113 Bridge 20 4.599 5 18 0.098 5 20 1033 5 --
309041 DE 150-001 Iron Branch Whartons Branch at Rt. 334 Bridge 23 4.59 5 21 0.146 5 19 1500 5 -- 309051 DE 150-001 Iron Branch Iron Branch at Rt. 82 Bridge 10 3.88 5 8 ID 3 10 210 5 -- 202031 DE 160-001 Lower Leipsic River Rt. 42 19 2.294 5 19 0.385 5 18 600 5 -- 202161 DE 160-001 Lower Leipsic River White Hall Landing 6ID36ID35ID3--
202041 DE 160-002 Upper Leipsic River DE Rt. 42, 21.43 miles from mouth 19 2.645 5 19 0.376 5 18 800 5 -- 202191 DE 160-002 Upper Leipsic River upstream Massey Rt. 15 7ID37ID36ID3-- 205271 DE 160-002 Upper Leipsic River Fork Branch Rd. 167 8ID38ID38ID3-- Leipsic, Tributaries From Dam At Garrisons Lake To 202151 DE 160-003 Mouth At Willis Br. Rd. 92 7ID37ID36ID3-- Leipsic, Tributaries From Dam At Garrisons Lake To 202181 DE 160-003 Mouth At Dyke Branch at Rt. 42 6ID36ID34ID3-- Leipsic, Tributaries From Dam At Garrisons Lake To 202211 DE 160-003 Mouth At Rt. 6 7ID37ID36ID3--
Tributaries From Headwaters 202171 DE 160-004 To Garrisons Lake Muddy Branch Rd. 86 7ID37ID36ID3-- 202021 DE 160-L01 Garrisons Lake Rt. 13 Bridge, Garrisons Lake 19 2.84 5 18 0.327 5 18 600 5 -- 202141 DE 160-L01 Garrisons Lake 100 yd above Garrison 6ID36ID35ID3-- 202011 DE 160-L02 Masseys Mill Pond Rd. 42 Bridge at Masseys Pond 19 3.48 5 19 0.332 5 18 2000 5 -- 202201 DE 160-L02 Masseys Mill Pond mid-Massey Pond 6ID36ID35ID3-- 305011 DE 170-001 Lewes-Rehoboth Canal Canal Rt. 1 20 1.484 5 17 0.174 5 19 53 5 -- Lewes and Rehoboth Canal at Rt. 305021 DE 170-001 Lewes-Rehoboth Canal 14 Bridge 1ID31ID31ID3-- Lewes and Rehoboth Canal at Rt. 305041 DE 170-001 Lewes-Rehoboth Canal 18 Bridge 20 1.297 5 17 0.15 5 19 47 5 -- 106 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Lewes and Rehoboth Canal at 305051 DE 170-001 Lewes-Rehoboth Canal Canal Mouth near Lewes 10 1.1905 5 8 ID 3 10 22 1 -- Lewes and Rehoboth Canal at 305061 DE 170-001 Lewes-Rehoboth Canal Holland Glade (Mid-Point) 1ID30ID31ID3-- Munchy Branch at Rd. 270A 305081 DE 170-001 Lewes-Rehoboth Canal (behind Midway Area) 19 1.996 5 17 0.097 5 18 1070 5 --
311011 DE 170-001 Lewes-Rehoboth Canal Bunting Branch at Railroad Bridge 9ID38ID38ID3-- 311031 DE 170-001 Lewes-Rehoboth Canal Polly Branch at Rt. 386 Bridge 6ID36ID36ID3-- Henlopen Marina Cont. Continuous Station at Marina on Mon. DE 170-001 Lewes-Rehoboth Canal L&R Canal ------Little Assawoman Canal at Rt. 357 312021 DE 180-001 Little Assawoman Canal Bridge 10 1.3675 5 9 ID 3 10 141.5 1 --
312041 DE 180-001 Little Assawoman Canal Assawoman Canal, Rd. 361 Bridge 18 0.964* 5 17 0.016* 5 19 450 5 1 308441 DE 180-002 Miller Creek Beaverdam @ Rd. 84 10 3.12 5 9 ID 3 10 365 5 -- 308451 DE 180-002 Miller Creek Beaverdam @ Rt. 17 9ID38ID39ID3-- Beaver Dam Ditch, Rd. 363, Miller 310101 DE 180-002 Miller Creek Branch 20 4.3 5 18 0.218 5 19 260 5 1 310031 DE 180-003 Dirickson Creek Derrickson creek, Rd. 381 20 4.17 5 18 0.345 5 19 350 5 1 Little Assawoman Bay ditch at Rd. 310011 DE 180-E01 Little Assawoman Bay 58 Bridge 18 0.234* 5 17 0.014* 1 19 53 5 1 310071 DE 180-E01 Little Assawoman Bay Little Assawoman Mid-Bay 18 0.446* 5 17 0.011* 1 19 22 1 1 204021 DE 190-001-01 Lower Little Creek Pipe Elm Dr. Rd. 67 7ID37ID36ID3-- 204031 DE 190-001-01 Lower Little Creek Rt. 9 Bridge 20 3.333 5 20 0.516 5 19 1300 5 -- 204041 DE 190-001-02 Upper Little Creek Rt. 8 Bridge 20 2.25 5 20 0.222 5 19 1117 5 -- 204011 DE 190-001-03 Pipe Elm Branch Postal Corner Road (Rd. 348) 20 2.62 5 20 0.109 5 19 600 5 -- Marshyhope Creek, Rt. 404 Bridge, DE Rt. 16 302021 DE 200-001 Headwaters To State Line (Woodenhawk Bridge) 19 3.649 5 19 0.12 5 19 405 5 -- Marshyhope Creek, 302031 DE 200-001 Headwaters To State Line Rt. 308 Bridge 19 3.18 5 19 0.224 5 19 310 5 -- Marshyhope Creek, Marshyhope Creek at Hemping 302041 DE 200-001 Headwaters To State Line Road (Rt. 299) Bridge 10 2.133 5 10 0.179 5 10 87 1 -- 107 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Tributaries From The Marshyhope Ditch at Fox Hunters 302051 DE 200-002 Headwaters To State Line Road (Rt. 277) Bridge 9ID39ID39ID3-- 208021 DE 210-001 Lower Mispillion River Rt. 1 Bridge 18 3.97 5 16 0.226 5 17 700 5 -- 208051 DE 210-001 Lower Mispillion River Jetty At Mouth 6ID35ID35ID3-- Mispillion River 0.43 miles from 208061 DE 210-001 Lower Mispillion River mouth at lighthouse 8ID37ID37ID3-- 208101 DE 210-001 Lower Mispillion River 4.64 miles from mouth 6ID35ID35ID3-- 208271 DE 210-001 Lower Mispillion River Mouth of Grecos Canal 6ID35ID35ID3-- 301081 DE 210-001 Lower Mispillion River Confluence w/ Mispillion 7ID36ID37ID3-- Upper Mispillion River, Tantrough Branch at Rd. 442 or 208241 DE 210-002 Headwaters To Silver Lake 620 6ID35ID35ID3-- Johnson Branch Including Its 208261 DE 210-003 Tributaries Johnson Branch at Rt. 36 6ID35ID35ID3-- Johnson Branch Including Its Downstream from Griffith Lake 208371 DE 210-003 Tributaries outfall at Rd. 451 6ID35ID35ID3-- Mispillion Tributaries From 208351 DE 210-004 Headwaters To Silver Lake Bowman Branch at Rd. 634 3ID32ID32ID3-- Mispillion Tributaries From 208361 DE 210-004 Headwaters To Silver Lake Lednum Branch at Rd. 443 6ID35ID35ID3-- Mispillion Tributaries From Dam At Silver Lake To The Mispillion River 7.14 miles from 208121 DE 210-005 Mouth mouth 7ID36ID36ID3-- Mispillion Tributaries From Dam At Silver Lake To The 208221 DE 210-005 Mouth Tub Mill Branch at Rd. 404 5ID34ID34ID3-- Mispillion Tributaries From Dam At Silver Lake To The 208281 DE 210-005 Mouth Causeway Branch at Rd. 123 6ID35ID35ID3-- Mispillion Tributaries From Dam At Silver Lake To The 208291 DE 210-005 Mouth Fishing Branch at Rd. 124 6ID35ID35ID3-- Mispillion Tributaries From Dam At Silver Lake To The Swan Creek at downstream side of 208301 DE 210-005 Mouth Rt. 113 6ID35ID35ID3--
108 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Mispillion Tributaries From Dam At Silver Lake To The 208331 DE 210-005 Mouth Mullet Run at Rt. 14 6ID35ID35ID3-- 208311 DE 210-L01 Tub Mill Pond Middle of Tub Mill Pond 6ID35ID35ID3-- 208211 DE 210-L02 Silver Lake Rt. 36 Silver Lake 19 4.74 5 17 0.056 5 18 250 5 -- 208321 DE 210-L02 Silver Lake Middle of Silver Lake 6ID35ID35ID3-- 208011 DE 210-L03 Haven Lake Haven Lake at Rt. 113 19 4.457 5 17 0.058 5 18 140 1 -- 208341 DE 210-L03 Haven Lake Middle of Haven Lake 6ID35ID35ID3-- 208381 DE 210-L04 Griffith Lake Middle of Griffith Lake 6ID35ID35ID3-- 208191 DE 210-L05 Blairs Pond Blairs Pond off Rd. 443 19 5.11 5 17 0.083 5 18 83 1 -- 208231 DE 210-L05 Blairs Pond Rt. 384 Beaverdam branch 19 4.226 5 17 0.048 1 18 1367 5 -- 208391 DE 210-L05 Blairs Pond Middle of Blairs Pond at Rd. 443 6ID35ID35ID3-- 208181 DE 210-L06 Abbotts Pond Abbotts Pond at Rd. 620 19 3.83 5 17 0.056 5 18 80 1 -- 208401 DE 210-L06 Abbotts Pond Middle of Abbotts Pond 6ID35ID35ID3-- 206091 DE 220-001 Lower Murderkill River US Rt. 113 20 4.56 5 19 0.372 5 19 733 5 -- 206101 DE 220-001 Lower Murderkill River Bowers Beach Wharf 19 1.844 5 18 0.342 5 18 50 5 -- Webb Landing (1.25 miles from the 206131 DE 220-001 Lower Murderkill River mouth) 20 1.792 5 19 0.317 5 19 93 5 -- 206141 DE 220-001 Lower Murderkill River 3.25 miles from the mouth 20 3.1 5 19 0.406 5 19 700 5 -- 206151 DE 220-001 Lower Murderkill River 5.39 miles from the mouth #N/A #N/A 3 #N/A #N/A 3 -- -- 3 -- Confluence of Kent County STP 206231 DE 220-001 Lower Murderkill River trib. 20 4.34 5 19 0.628 5 19 1000 5 -- 206081 DE 220-002 Spring Creek Spring Creek at Rt. 12 Bridge 20 4.51 5 19 0.333 5 18 833 5 -- Spring Creek, Double Run at Irish 206601 DE 220-002 Spring Creek Hill Rd. 7ID37ID37ID3-- Spring Creek, Double Run at 206611 DE 220-002 Spring Creek Peachtree Hill Rd. 5ID35ID35ID3-- Spring Creek, Double Run at US 206621 DE 220-002 Spring Creek Rt. 13 3ID33ID33ID3-- Spring Creek, Hudson Branch at 206631 DE 220-002 Spring Creek US Rt. 13 5ID35ID35ID3-- Spring Creek, Pratt Branch at 206641 DE 220-002 Spring Creek Canterbury Rd. 5ID35ID35ID3--
109 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment
206171 DE 220-003 Mid Murderkill River Murderkill River, at Road 338 ------206211 DE 220-003 Mid Murderkill River 9.64 miles from mouth 1ID31ID31ID3-- 206041 DE 220-004 Browns Branch Browns Branch at Rt. 14 Bridge 20 14.6 5 19 0.107 5 18 1400 5 --
206051 DE 220-004 Browns Branch Browns Branch at RD. 384 Bridge 20 7.452 5 19 0.091 5 18 1233 5 --
Murderkill River, trib to Browns BR at Rd. 206251 DE 220-004 Browns Branch 398 ------
Tributary of Browns Branch at US 206421 DE 220-004 Browns Branch Rt. 13, east edge of Harrington 1ID31ID31ID3-- Browns Branch at Dr. Smith Rd. 206701 DE 220-004 Browns Branch (Rt. 431) 5 ID 3 4 ID 3 -- -- 3 -- 206011 DE 220-005 Upper Murderkill River US Rt. 13 Bridge below Felton 20 3.71 5 19 0.117 5 18 1200 5 --
Tributary of Browns Branch at US 206651 DE 220-005 Upper Murderkill River Rt. 13, east edge of Harrington 8ID37ID34ID3-- Upper Murderkill River at Little Masten Rd., downstream of the confluence with Beaverdam 206661 DE 220-005 Upper Murderkill River Branch 5ID35ID35ID3--
Upper Murderkill River, Black 206671 DE 220-005 Upper Murderkill River Swamp Creek at Marshyhope Rd. 5ID35ID35ID3-- Spring Branch above Cursey Pond 206681 DE 220-005 Upper Murderkill River at Chimney Hill Rd. 5ID35ID35ID3-- 206461 DE 220-L01 Mcginnis Pond Hudson Branch, McGinnis Pond 20 5.181 5 19 0.082 5 18 190 5 -- 206561 DE 220-L01 Mcginnis Pond Double Run at Rt. 371 Bridge 20 5.395 5 19 0.249 5 18 2000 5 -- 206071 DE 220-L02 Andrews Lake Andrews Lake at Rd. 380 Bridge 20 5.828 5 19 0.134 5 18 200 5 -- 206451 DE 220-L03 Coursey Pond Coursey Pond at Rd. 388 Bridge 20 3.499 5 19 0.171 5 18 90 1 -- 206021 DE 220-L04 Killen Pond Killen Pond at Killen Pond Rd. 1ID31ID31ID3-- 206691 DE 220-L04 Killen Pond Killen Pond at Killen Pond Rd. 4ID34ID34ID3-- 206361 DE 220-L05 Mccauley Pond McCauley Pond near spillway 20 4.653 5 19 0.133 5 18 140 1 -- 110 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Lower Naamans Creek 101041 DE 230-001-01 Including Its Tributaries Rt. 13A 17 1.959 5 17 0.076 5 16 600 5 -- Upper Naamans Creek Including North Br. And 101021 DE 230-001-02 South Br. Naamans Creek at Naamans Road 20 1.975 5 19 0.081 5 20 967 5 -- Upper Naamans Creek Including North Br. And 101031 DE 230-001-02 South Br. Naamans Creek South Branch 19 2.188 5 19 0.08 5 19 633 5 -- 304011 DE 240-001 Lower Nanticoke River Sharptown 20 3.845 5 18 0.138 5 20 63 1 -- 304021 DE 240-001 Lower Nanticoke River Woodland Ferry 17 3.92 5 15 0.111 5 17 143 1 1 304031 DE 240-001 Lower Nanticoke River Rt. 13A Bridge 17 3.64 5 15 0.098 5 16 87 1 5 304041 DE 240-001 Lower Nanticoke River Middleford Bridge 20 4.8 5 18 0.0865 5 19 115 1 5 Bridgeville Branch at US Rt. 13 304051 DE 240-001 Lower Nanticoke River Bridge 5ID34ID35ID3-- 304071 DE 240-001 Lower Nanticoke River Buoy 45 State Line 20 4.05 5 18 0.106 5 20 57 1 5 304091 DE 240-001 Lower Nanticoke River Buoy 51 (Conf. Broad Creek) 20 4.037 5 18 0.116 5 20 127 1 -- 304101 DE 240-001 Lower Nanticoke River Buoy 57 17 3.94 5 15 0.105 5 17 123 1 5 304141 DE 240-001 Lower Nanticoke River Buoy 65 17 4.36 5 15 0.114 5 17 113 1 5 304151 DE 240-001 Lower Nanticoke River Buoy 66 (Conf DuPont Gut) 20 4.318 5 18 0.114 5 20 73 1 1 304171 DE 240-001 Lower Nanticoke River Buoy 68 17 4.089 5 15 0.127 5 17 123 1 5 304461 DE 240-001 Lower Nanticoke River Seaford STP Discharge 20 4.048 5 18 0.126 5 20 107 1 5 304471 DE 240-001 Lower Nanticoke River Rt. 13 Bridge 20 3.425 5 18 0.135 5 19 113 1 5 Herring Run at Rt. 20 Bridge 304621 DE 240-001 Lower Nanticoke River before entering Williams Pond 5ID34ID35ID3--
304191 DE 240-002 Upper Nanticoke River Rd. 545 Mainstem Nanticoke 20 6.296 5 18 0.071 5 19 103 1 5 304291 DE 240-002 Upper Nanticoke River Nanticoke @ Rt. 600 Bridge 19 5.176 5 17 0.102 5 18 127 1 1 Clear Brook above DE Rt. 18 304371 DE 240-003 Clear Brook Branch Bridge 4ID33ID34ID3-- Clear Brooks, Bucks Branch at Rd. 304381 DE 240-003 Clear Brook Branch 546 7ID36ID37ID3-- 304571 DE 240-003 Clear Brook Branch Clear Brook at US Rt. 13 5ID34ID35ID3-- William H. Newton Ditch at Rt. 46 304631 DE 240-003 Clear Brook Branch Bridge 2ID31ID32ID3-- 111 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment
Deep Creek above Concord Pond, 304591 DE 240-004 Deep Creek Branch near Old Furnace at Rd. 46 5ID34ID35ID3-- Deep Creek above Concord Pond, near Cokesbury Church at DE Rt. 304601 DE 240-004 Deep Creek Branch 18 5ID34ID35ID3--
304641 DE 240-004 Deep Creek Branch Baker Mill Branch at Rt. 483 Bridge 5ID34ID35ID3-- 316011 DE 240-005 Gravelly Branch Rd. 525 Gravelly Branch 23 2.116 5 21 0.048 1 19 260 5 1 Gravelly Branch downstream of the outlet of Collins Pond at Rt. 404 316021 DE 240-005 Gravelly Branch Bridge 5ID34ID35ID3--
Gravelly Branch at west edge of 316031 DE 240-005 Gravelly Branch Redden State Park, Rd. 565 Bridge 5ID34ID35ID3-- 304251 DE 240-006 Bridgeville Branch Bridgeville Branch At Us Rt 13a 5 ID 3 4 ID 3 -- -- 3 -- Bridgeville Branch at DE Rt. 404 304271 DE 240-006 Bridgeville Branch Bridge 5ID34ID35ID3-- Bridgeville Branch at Rd. 564 304611 DE 240-006 Bridgeville Branch Bridge 5ID34ID35ID3-- 304441 DE 240-007 Gum Branch Gum Branch at Rd. 487 Bridge 5ID34ID35ID3-- 304531 DE 240-007 Gum Branch Gum Branch at Rd. 485 Bridge 5ID34ID35ID3-- Lewes Creek, Chapel Branch at Rt. 304451 DE 240-008 Lewes Creek 20 5ID34ID35ID3-- Lewes Creek, Chapel Branch at 304541 DE 240-008 Lewes Creek Rd. 547 5ID34ID35ID3-- Lewes Creek, Butler Mill Branch at 304551 DE 240-008 Lewes Creek Rd. 80 Bridge 5ID34ID35ID3-- Lewes Creek, Butler Mill Branch, 304561 DE 240-008 Lewes Creek Horse Pen Branch at Rd. 20 5ID34ID35ID3-- Gum Branch, Upper 304661 DE 240-010 Nanticoke River Gum Branch at RT 591 2ID30ID32ID3-- Lewes Creek, Butler Mill Branch, downstream of Craig Pond at Rd. 304301 DE 240-L01 Craigs Pond 542A 5ID34ID35ID3-- 112 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment 304311 DE 240-L02 Concord Pond Concord Pond Overflow 20 2.569 5 18 0.055 5 19 50 1 1 Tyndall Branch at Rt. 484 Bridge at 304651 DE 240-L02 Concord Pond spillway of Fleetwood Pond 4ID33ID34ID3-- 304321 DE 240-L04 Williams Pond Williams Pond Overflow 20 5.36 5 18 0.097 5 19 83 1 5 Williams Pond, middle of the pond 304581 DE 240-L04 Williams Pond at US Rt. 13 5ID34ID35ID3-- Hearns Pond, 100 yrd above 304411 DE 240-L05 Hearns Pond spillway 5ID34ID35ID3-- Pocomoke River, Headwaters To Maryland 313011 DE 250-001 State Line Rd. 419 20 3.843 5 20 0.156 5 20 480 5 -- Pocomoke River, Headwaters To Maryland 313041 DE 250-001 State Line Pocomoke River at Rt. 417 Bridge 12 2.936 5 12 0.273 5 12 570 5 -- Pocomoke River, Headwaters To Maryland 313051 DE 250-001 State Line Pocomoke River at Rt. 30 Bridge 12 3.93 5 12 0.112 5 12 600 5 -- Pocomoke River, Tributaries From The Headwaters To 313021 DE 250-002 Maryland Gums Branch at Rt.413 Bridge 12 4.466 5 12 0.153 5 12 505 5 -- Pocomoke River, Tributaries From The Headwaters To 313031 DE 250-002 Maryland Cyprus Branch at Rd. 60 Bridge 12 3.794 5 12 0.172 5 12 290 5 -- Red Clay Creek From Stanton, Rt. 4 (USGS gage 103011 DE 260-001 Pennsylvania State Line 01480015) 22 3.638 5 22 0.276 5 22 733 5 -- Red Clay Creek From Wooddale, Rt. 8 (USGS gage 103031 DE 260-001 Pennsylvania State Line 01480000) 22 3.935 5 22 0.287 5 22 505 5 -- Red Clay Creek From 103041 DE 260-001 Pennsylvania State Line Ashland, Rd. 258a 22 4.57 5 22 0.405 5 22 700 5 --
Burroughs Run From 103061 DE 260-002 Pennsylvania State Line Run Burrough's Run Confluence 22 2.383 5 22 0.058 5 21 430 5 -- 107031 DE 270-001-01 Lower Red Lion Creek Rt. 9 Bridge 20 2.131 5 19 0.151 5 20 600 5 -- 107061 DE 270-001-01 Lower Red Lion Creek Uppertwin 5ID35ID35ID3--
113 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Upper Red Lion Creek, 107011 DE 270-001-02 Headwaters To Route 13 Rt. 7 20 3.06 5 19 0.076 5 19 580 5 -- Upper Red Lion Creek, 107041 DE 270-001-02 Headwaters To Route 13 Red Lion Rd. 7ID37ID37ID3-- Upper Red Lion Creek, 107071 DE 270-001-02 Headwaters To Route 13 Govenor Lea 7ID37ID37ID3-- From The Headwaters Of Chapel Br. To The 308051 DE 280-001-01 Confluence Of Guinea Creek at Rt. 298 Bridge 20 3.656 5 17 0.116 5 19 1067 5 1 From The Headwaters Of Chapel Br. To The 308431 DE 280-001-01 Confluence Of Guinea Creek at Rt. 24 Bridge 10 3.44 5 9 ID 3 10 816.5 5 -- 308021 DE 280-002 Love Creek Love Creek at Rt. 24 Bridge 10 2.0935 5 9 ID 3 10 460 5 -- 308291 DE 280-002 Love Creek Love Creek, Rd. 277 20 2.597 5 17 0.0395 1 19 100 1 1 Bundick's Branch at Rt. 23 Bridge 308371 DE 280-002 Love Creek (Trib. Of Love Creek) 8ID38ID37ID3--
308411 DE 280-002 Love Creek Goslee Creek at Rt. 285 A Bridge 6ID35ID36ID3--
308421 DE 280-002 Love Creek Bundicks Branch at Rt. 286 Bridge 10 2.184 5 9 ID 3 10 1167 5 -- 306071 DE 280-E01 Rehoboth Bay Buoy 3, Rehoboth Bay 18 0.161* 5 17 .036* 5 19 4 1 1 306091 DE 280-E01 Rehoboth Bay Buoy 7, Rehoboth Bay 18 0.094* 1 18 0.024* 5 19 3 1 1 306111 DE 280-E01 Rehoboth Bay Massey's Ditch at Buoy 17 18 0.097* 1 18 .024* 5 19 5 1 1 308031 DE 280-L01 Burton Pond Burton Pond, Rd. 24 20 3.087 5 17 0.044 1 19 113 1 1 205011 DE 290-001-01 Lower St. Jones River St. Jones @ Bowers 8ID38ID38ID3-- 205031 DE 290-001-01 Lower St. Jones River 2.75 miles from mouth 8ID38ID38ID3-- 205041 DE 290-001-01 Lower St. Jones River Barkers Landing 15 3.06 5 14 0.32 5 15 270 5 -- 205061 DE 290-001-01 Lower St. Jones River Gravel Pit 8ID38ID38ID3-- 205091 DE 290-001-02 Upper St. Jones River Rt. 10 Bridge 15 3.186 5 14 0.363 5 15 360 5 -- 205131 DE 290-001-02 Upper St. Jones River Rt. 13 St. Jones 8ID38ID38ID3-- 205571 DE 290-001-02 Upper St. Jones River Division Street 15 2.105 5 14 0.212 5 15 250 5 -- 205241 DE 290-002 Isaac Branch Rt. 13 North Moores Lake 15 4.389 5 14 0.079 5 15 600 5 -- 205321 DE 290-002 Isaac Branch Isaac Br @ Rd. 203 6ID36ID36ID3-- 205601 DE 290-002 Isaac Branch Wyoming Lake 6ID36ID36ID3-- 205151 DE 290-003 Fork Branch Rd. 69 State College 15 1.667 5 14 0.362 5 15 260 5 -- 114 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment 205171 DE 290-003 Fork Branch Fork Branch Rd. 156 8ID38ID38ID3-- 205261 DE 290-004 Tidbury Branch Tidbury Creek @ Rd. 125 8ID38ID38ID3-- 205581 DE 290-004 Tidbury Branch Tidbury Creek at Rd. 105 4ID34ID34ID3-- 205591 DE 290-004 Tidbury Branch Voshell Pond @ Rd. 360 8ID38ID38ID3-- 205181 DE 290-L01 Moores Lake Rt. 13 Alt. Moores Lake 15 3.98 5 14 0.104 5 15 230 5 -- 205231 DE 290-L01 Moores Lake Isaac Branch at Rt. 203 2ID32ID32ID3-- 205191 DE 290-L02 Silver Lake Silver Lake Spillway 15 1.864 5 14 0.206 5 15 157 1 -- 205201 DE 290-L02 Silver Lake Silver Lake St Street 8ID38ID37ID3-- 205211 DE 290-L03 Derby Pond Derby Pond at Rt. 13A 15 2.8825 5 14 0.079 5 15 163 1 -- 102041 DE 300-001-01 Lower Shellpot Creek Cherry Island at Rd. 501 Bridge 20 4.01 5 20 0.269 5 20 600 5 -- 102011 DE 300-001-02 Upper Shellpot Creek Rt. 13 Bridge 20 2.553 5 20 0.093 5 20 600 5 -- Shellpot Creek, at Rt. 13 Bud 102051 DE 300-001-02 Upper Shellpot Creek (Market Street) Bridge 8ID38ID38ID3--
102061 DE 300-001-02 Upper Shellpot Creek Matson Run at Miller Road Bridge 7ID37ID37ID3-- Turkey Run at Weldin Road (Rt. 102071 DE 300-001-02 Upper Shellpot Creek 215) Bridge 6ID36ID36ID3-- Shellpot Creek at Carr Road 102081 DE 300-001-02 Upper Shellpot Creek Bridge 7ID37ID37ID3-- Shellpot Creek at Foulk Road (Rt. 102091 DE 300-001-02 Upper Shellpot Creek 261) Bridge 7ID37ID37ID3-- 201011 DE 310-001 Smyrna River Mill Creek Rt. 13 7ID36ID37ID3-- 201031 DE 310-001 Smyrna River Mill Creek @ Rt. 6 7ID36ID37ID3-- 201041 DE 310-001 Smyrna River Rt. 9 Fleming's Landing 20 2.732 5 17 0.309 5 20 1117 5 -- 201051 DE 310-001 Smyrna River Rt. 485 Bridge 20 3.229 5 17 0.32 5 20 1233 5 -- 201021 DE 310-002 Mill Creek Rt. 137 Bridge 20 3.386 5 17 0.179 5 20 1133 5 -- 201151 DE 310-002 Mill Creek Mill Creek Rt. 300 7ID36ID37ID3-- Tributaries From The Headwaters To The 201161 DE 310-003 Confluence With Rt. 482 Bridge 20 4.18 5 17 0.181 5 20 1433 5 -- Tributaries From The Headwaters To The 201171 DE 310-003 Confluence With Sawmill Br @ Long bridge 7ID36ID37ID3--
115 Table III-4 2004 Station Summary Statistics N Attainment P Attainment Bacterial Attainment
Station Segment Segment Description Station Location ERES Use Support # samples N LCL 90th %tile N Attainment # samples P LCL 90th %tile P Attainment # samples B LCL 90th %tile Bacterial Attainment Tributaries From The Headwaters To The 201181 DE 310-003 Confluence With Duck Creek Rd 7ID36ID37ID3-- Tributaries From The Headwaters To The 201201 DE 310-003 Confluence With Green Spring Br Rd 41 7ID36ID37ID3-- Tributaries From The Headwaters To The 201211 DE 310-003 Confluence With PawPaw Br Rd 483 7ID36ID37ID3-- Tributaries From The Headwaters To The 201221 DE 310-003 Confluence With Providence Creek 483 7ID36ID37ID3-- Lake Como & Duck Creek 201141 DE 310-L01 Pond Lake Como 100 yards above 7ID36ID37ID3-- Lake Como & Duck Creek 201191 DE 310-L01 Pond mid Duck Creek Pond 7ID36ID37ID3-- White Clay Creek From 105011 DE 320-001 Pennsylvania State Line Stanton, Old Rt. 7 Bridge 22 4.058 5 22 0.176 5 22 600 5 -- White Clay Creek From 105031 DE 320-001 Pennsylvania State Line Chambers Rock Rd. 22 4.663 5 22 0.232 5 22 733 5 5 White Clay Creek From DE Park Race Track (USGS gage 105151 DE 320-001 Pennsylvania State Line 01479000) 22 4.01 5 22 0.192 5 22 833 5 -- Mill Creek Confluence, Above Rt. 4 105071 DE 320-002 Mill Creek (DE Park) 22 2.8 5 22 0.054 5 22 900 5 -- 105171 DE 320-002 Mill Creek McKee Lane 3ID33ID33ID3-- Pike Creek Confluence, Upper 105101 DE 320-003 Pike Creek Pike Creek Rd. 22 2.656 5 22 0.039 1 22 1333 5 -- Middle Run Confluence, Possum 105131 DE 320-004 Middle Run Park Rd. 22 2.15 5 22 0.049 1 22 600 5 --
116 Table III-5 2004 Delaware Surface Water Segment Attainment
Segment Fish advisory Length contaminants, Watershed Segment ID Segment Name (miles) or P Att
N Att metals or area (acres ammonia Avg DO Att Min DO Att. DO Min or sq. miles) Bacterial Att
ERES Attainment Overall Attainment Notes PCBs, Appoquinimink River DE 010-001-01 Lower Appoquinimink River 7.1m 4a 4a 5 4a 4a Dioxins -- 5 PCBs, Appoquinimink River DE 010-001-02 Upper Appoquinimink River - Odessa 6.1m 4a 4a 5 4a 4a Dioxins -- 5 Appoquinimink River DE 010-001-03 Drawyer Creek and Tributaries 19.5m 1 4a 5 4a 4a PCBs, DDT -- 5 All Tributaries From The Headwaters Of Appoquinimink River DE 010-001-04 10.3m 33333 Appoquinimink River to the Bay -- 3 Upper Appoquinimink - Wiggins Mill Appoquinimink River DE 010-002-01 3.4m 1 4a 3 4a 4a Pond Branch -- 4a Upper Appoquinimink, Deep Creek To Bacteria 5 from Appoquinimink River DE 010-002-02 4.4m 1 4a 5 4a 4a Confluence With Silver Lake -- 5 prior listing Appoquinimink River DE 010-L01 Noxontown Pond 158.6a 1 1 1 4a 4a -- 4a PCBs, Appoquinimink River DE 010-L02 Silver Lake (Middletown) 38.7a 1 1 1 4a 4a Dieldrin, DDT, Dioxin -- 5 Appoquinimink River DE 010-L03 Shallcross Lake 43.1a 1 1 1 4a 4a -- 4a Army Creek DE 020-001 Lower Army Creek 6.8m 53555 -- 5 Army Creek DE 020-002 Upper Army Creek 1.9m 13555 -- 5 Tributaries to Army Creek not on the Army Creek DE 020-003 6.5m 33333 Mainstem -- 3 Blackbird Creek DE 030-001 Lower Blackbird Creek 13.8m 53555 -- 5 Blackbird Creek DE 030-002 Upper Blackbird Creek 13.6m 53555 -- 5 Tributaries on the mainstem of Blackbird Creek DE 030-003 9.7m 53333 Blackbird Creek -- 5 Brandywine Creek DE 040-001 Lower Brandywine River 3.8m 1 1 5 4a 4a PCBs -- 5 Upper Brandywine Creek, From State Brandywine Creek DE 040-002 9.3m 1 1 5 4a 4a Line To Wilmington PCBs, Dioxin 1 5 All Tributaries On Brandywine Creek Brandywine Creek DE 040-003 From The Headwaters to the 19.3m 33333 Confluence with the Christina River 3 3 Lower Broad Creek, Including Collins & Broad Creek DE 050-001 Culvert Ditch, Holly Ditch, Rossakatum 39.2m 1 4a 3 4a 4a and Cooper Branches -- 4a Bacteria 5 from Broad Creek DE 050-002 Tussocky Branch 13.0m 1 3 5 4a 4a -- 5 prior listing Broad Creek DE 050-003 Little Creek 20.1m 3 3 3 4a 4a -- 4a Broad Creek DE 050-004 Chipman Pond Branch 21.7m 1 3 3 4a 4a -- 4a James Branch Including Pepper Pond Broad Creek DE 050-005-01 31.7m 4a 4a 3 4a 4a Br., Hitch Pond Br., Etc. 3 4a Broad Creek DE 050-005-02 Trussum Pond Branch 18.8m 4a 4a 3 4a 4a 3 4a Broad Creek DE 050-006-01 Trap Pond Branch 21.5m 3 3 3 4a 4a 3 4a Table III-5 2004 Delaware Surface Water Segment Attainment
Segment Fish advisory Length contaminants, Watershed Segment ID Segment Name (miles) or P Att
N Att metals or area (acres ammonia Avg DO Att Min DO Att. DO Min or sq. miles) Bacterial Att
ERES Attainment Overall Attainment Notes Bacteria 5 from Broad Creek DE 050-006-03 Raccoon Prong 21.0m 1 4a 5 4a 4a 3 5 prior listing Broad Creek DE 050-L01 Portsville Pond 14.5a 3 3 3 4a 4a 3 4a Broad Creek DE 050-L02 Tussock Pond 8.6a 1 3 3 4a 4a -- 4a Broad Creek DE 050-L03 Horseys Pond 46.3a 1 1 1 4a 4a 1 4a Broad Creek DE 050-L04 Records Pond 91.9a 1 1 5 4a 4a 5 5 Bacteria 5 from Broad Creek DE 050-L05 Chipman Pond & Wileys Pond 47.0a 1 3 5 4a 4a 3 5 prior listing Broad Creek DE 050-L06 Trussum Pond 58.7a 4a 4a 5 4a 4a 3 5 Broad Creek DE 050-L07 Trap Pond 88.0a 1 3 3 4a 4a 3 4a Bacteria 5 from Broad Creek DE 050-L08 Raccoon Pond 13.5a 1 3 5 4a 4a 3 5 prior listing DO 5 From prior Broad Kill River DE 060-001 Lower Broadkill River 10.6m 15555 -- 5 listing Broad Kill River DE 060-002 Beaverdam Creek 8.3m 53555 -- 5 Broad Kill River DE 060-003 Upper Broadkill River 7.5m 13155 -- 5 DO 5 From prior Broad Kill River DE 060-004 Round Pole Branch 5.2m 15555 -- 5 listing Broad Kill River DE 060-005 Ingram Branch 13.0m 53555 -- 5 Broad Kill River DE 060-006 Pemberton Branch 8.7m 13555 -- 5 Broad Kill River DE 060-007-01 Lower Red Mill Branch 5.3m 13155 -- 5 5s from prior Broad Kill River DE 060-007-02 Martin Branch 1.5m 15355 -- 5 listing Broad Kill River DE 060-007-03 Heronwood Branch 1.0m 33333 -- 3 Primehook Creek Including Its Broad Kill River DE 060-008 23.6m 33333 Tributaries -- 3 Broad Kill River DE 060-L01 Red Mill Pond 150.0a 13555 -- 5 DO 5 From prior Broad Kill River DE 060-L02 Waggamons Pond 35.0a 15155 -- 5 listing Broad Kill River DE 060-L03 Waples Pond & Reynolds Pond 88.8a 53555 -- 5 Table III-5 2004 Delaware Surface Water Segment Attainment
Segment Fish advisory Length contaminants, Watershed Segment ID Segment Name (miles) or P Att
N Att metals or area (acres ammonia Avg DO Att Min DO Att. DO Min or sq. miles) Bacterial Att
ERES Attainment Overall Attainment Notes
DNREC has confirmed that the EPA approved MD TMDL for nutriends and DO for downstream section of this Buntings Branch DE 070-001 Bunting's Branch 11.1m 1 3 5 4b 4b waterbody will be protective in Delaware portion. DNREC has committed to working cooperatively with MD to implement the approved -- 5 TMDL. Cedar Creek DE 080-001 Lower Cedar Creek 21.8m 53555 1 5 Upper Cedar Creek, Headwaters To Cedar Creek DE 080-002 22.9m 53155 Cedar Creek Mill Pond -- 5 Cedar Creek DE 080-003 Slaughter Creek 16.7m 53333 3 5 Chesapeake And Delaware Canal From C&D Canal DE 090-001 15.0m 13155 PCBs, Maryland Line To Delaware River Dioxins -- 5 C&D Canal East DE 090-L01 Lums Pond 189.3a 13155 -- 5 Chester River DE 100-001 Cypress Branch 12.2m 53555 -- 5 Chester River DE 100-002 Sewell Branch 18.8m 13555 -- 5 Chester River DE 100-003 Gravelly Run 20.6m 53555 -- 5 C&D Canal DE 100-004 Tributaries Of Elk River 21.7m 33333 -- 3 Sassafras River DE 100-005 Tributaries Of Sassafras River 7.2m 33333 -- 3 Choptank River DE 110-001 Tappahanna Ditch 36.3m 53555 -- 5 Choptank River DE 110-002 Culbreth Marsh Ditch 34.3m 53555 -- 5 Choptank River DE 110-003 Cow Marsh Creek 89.9m 53555 -- 5 Choptank River DE 110-L01 Mud Mill Pond 60.0a 53555 -- 5 PCBs, Christina River DE 120-001 Lower Christina River 1.5m 13555 Dieldrin -- 5 Mid Christina River, Between White PCBs, Christina River DE 120-002 8.5m 1 3 5 4a 4a Clay Creek And Brandywine Dieldrin -- 5 Table III-5 2004 Delaware Surface Water Segment Attainment
Segment Fish advisory Length contaminants, Watershed Segment ID Segment Name (miles) or P Att
N Att metals or area (acres ammonia Avg DO Att Min DO Att. DO Min or sq. miles) Bacterial Att
ERES Attainment Overall Attainment Notes Christina River, Tributaries On The Christina River DE 120-002-01 Christina River Between White Clay 3.0m 33333 Crrek and Brandywine River PCBs -- 5 Christina River DE 120-003 Upper Christina River 6.9m 4a 4a 5 4a 4a -- 5 Christina River DE 120-003-01 Nonesuch Creek 3.0m 33333 -- 3 Christina River Tributaries From Christina River DE 120-003-02 Smalleys Pond Overflow To White Clay 3.1m 4a 4a 3 4a 4a Creek -- 4a Christina River DE 120-004-01 Lower Christina Creek 8.4m 13555 PCBs -- 5 Christina River DE 120-004-02 Belltown Run 5.6m 15355 -- 5 Bacteria 5 from Christina River DE 120-004-03 Muddy Run 13.1m 33533 -- 5 prior listing West Branch Including Persimmon Run Christina River DE 120-005-01 5.3m 33333 And Stine Haskell Branch -- 3 Christina River DE 120-006 Upper Christina Creek 10.8m 1 1 5 4a 4a -- 5 Christina River DE 120-007-01 Little Mill Creek 12.8m 1 3 5 4a 4a PCBs -- 5 Christina River DE 120-007-02 Chestnut Run 2.8m 33333 -- 3 Christina River DE 120-L01 Smalleys Pond 30.0a 55555 PCBs -- 5 PCBs, Bacteria 5 from Christina River DE 120-L02 Becks Pond 25.6a 13533 Mercury -- 5 prior listing Christina River DE 120-L03 Sunset Pond 40.0a 53333 -- 5 Dragon Run Creek DE 130-001 Lower Dragon Run Creek 3.2m 55355 -- 5 Dragon Run Creek DE 130-002 Upper Dragon Run Creek 4.5m 53555 -- 5 Indian River/Indian River DE 140-001 White Creek 11.2m 55555 Bay 3 5 Indian River/Indian River DE 140-002 Blackwater Creek 13.8m 55555 Bay 3 5 Pepper Creek And Tributaries, Including Indian River/Indian River DE 140-003 Vines Creek, Mccrays and Deep Hole 53.7m 51555 Bay Branches 1 5 Indian River/Indian River DE 140-004 Indian River 9.4m 4a 4a 5 4a 4a Bay 1 5 Indian River/Indian River DE 140-005 Swan Creek 8.6m 11555 Bay 1 5 Indian River/Indian River DE 140-006 Stockley Branch 12.1m 11555 Bay -- 5 Indian River/Indian River 5s from prior DE 140-007 Eli Walls Tax Ditch 13.6m 33555 Bay -- 5 listing Table III-5 2004 Delaware Surface Water Segment Attainment
Segment Fish advisory Length contaminants, Watershed Segment ID Segment Name (miles) or P Att
N Att metals or area (acres ammonia Avg DO Att Min DO Att. DO Min or sq. miles) Bacterial Att
ERES Attainment Overall Attainment Notes Deep Branch, Including Peterkins Br., Indian River/Indian River DE 140-008 White Oak Swamp Ditch, Socorockets 16.9m 55555 Bay 5s from prior Ditch, Welsh and Simpler Branches -- 5 listing Indian River/Indian River Mirey Branch, Including Sheep Pen DE 140-009 23.5m 13553 Bay Ditch, And Narrow Drain -- 5 Indian River/Indian River DE 140-010 Betts Pond Branch 23.8m 53553 Bay -- 5 Indian River/Indian River DE 140-E01 Lower Indian River Bay 13.0sqm 1 4a 1 4a 4a Bay 1 4a Indian River/Indian River DE 140-E02 Upper Indian River Bay 0.9sqm 4a 4a 5 4a 4a Bay 5 5 Indian River/Indian River DE 140-L01 Millsboro Pond 126.0a 15555 Bay -- 5 Indian River/Indian River DE 140-L02 Betts Pond 80.0a 13153 Bay -- 5 Indian River/Indian River DE 140-L03 Ingram Pond 48.0a 13353 Bay -- 5 Indian River/Indian River Bacteria 5 from DE 140-L04 Morris Mill Pond 44.0a 33533 Bay -- 5 prior listing Iron Branch DE 150-001 Iron Branch 30.2m 15555 3 5 Leipsic River DE 160-001 Lower Leipsic River 13.6m 55555 -- 5 Leipsic River DE 160-002 Upper Leipsic River 24.5m 55555 -- 5 Leipsic, Tributaries From Dam At Leipsic River DE 160-003 37.2m 53333 Garrisons Lake To Mouth -- 5 Tributaries of Liepsic River From Leipsic River DE 160-004 35.4m 53333 Headwaters To Garrisons Lake -- 5 Leipsic River DE 160-L01 Garrisons Lake 85.9a 15555 -- 5 Leipsic River DE 160-L02 Masseys Mill Pond 30.0a 55555 -- 5 Lewes and Rehoboth DE 170-001 Lewes-Rehoboth Canal 14.1m 55555 Canal 3 5 Little Assawoman Bay DE 180-001 Little Assawoman Canal 9.3m 55555 1 5 Little Assawoman Bay DE 180-002 Miller Creek 14.1m 55555 1 5 Little Assawoman Bay DE 180-003 Dirickson Creek 31.0m 15555 1 5 Jefferson Creek And Dead End Little Assawoman Bay DE 180-004 5.2m 33333 Lagoons 3 3 Little Assawoman Bay DE 180-E01 Little Assawoman Bay 3.0sqm 55551 1 5 Little River DE 190-001-01 Lower Little Creek 2.9m 55555 -- 5 Little River DE 190-001-02 Upper Little Creek 10.2m 55555 -- 5 Little River DE 190-001-03 Pipe Elm Branch 2.1m 55555 -- 5 Table III-5 2004 Delaware Surface Water Segment Attainment
Segment Fish advisory Length contaminants, Watershed Segment ID Segment Name (miles) or P Att
N Att metals or area (acres ammonia Avg DO Att Min DO Att. DO Min or sq. miles) Bacterial Att
ERES Attainment Overall Attainment Notes Tributaries of Little River Located In The Little River DE 190-001-04 6.1m 33333 Watershed But Not On The Mainstem -- 3 Marshyhope Creek, Headwaters To Marshyhope Creek DE 200-001 20.3m 13555 State Line -- 5 Tributaries of Marshyhope CreekFrom Marshyhope Creek DE 200-002 145.3m 13333 The Headwaters To State Line -- 2 Mispillion River DE 210-001 Lower Mispillion River 13.2m 53555 -- 5 Upper Mispillion River, Headwaters To 5s from prior Mispillion River DE 210-002 11.2m 13555 Silver Lake -- 5 listing Mispillion River DE 210-003 Johnson Branch Including Its Tributaries 9.8m 13333 -- 2 Mispillion Tributaries From Headwaters Mispillion River DE 210-004 5.6m 13333 To Silver Lake -- 2 Mispillion Tributaries From Dam At Mispillion River DE 210-005 29.1m 53333 Silver Lake To The Mouth -- 5 5s from prior Mispillion River DE 210-L01 Tub Mill Pond 4.8a 13355 -- 5 listing Mispillion River DE 210-L02 Silver Lake (Milford) 28.5a 13555 -- 5 Mispillion River DE 210-L03 Haven Lake 82.5a 13355 -- 5 Mispillion River DE 210-L04 Griffith Lake 32.2a 13333 -- 2 Mispillion River DE 210-L05 Blairs Pond 28.5a 13555 -- 5 DO 5 From prior Mispillion River DE 210-L06 Abbotts Pond 25.6a 15355 -- 5 listing Murderkill River DE 220-001 Lower Murderkill River 27.5m 4a 4a 5 4a 4a -- 5 Murderkill River DE 220-002 Spring Creek 36.5m 4a 4a 5 4a 4a -- 5 Murderkill River DE 220-003 Mid Murderkill River 16.2m 4a 4a 3 4a 4a -- 4a Murderkill River DE 220-004 Browns Branch 24.1m 1 4a 5 4a 4a Ammonia -- 5 Murderkill River DE 220-005 Upper Murderkill River 21.7m 4a 4a 5 4a 4a -- 5 Murderkill River DE 220-L01 Mcginnis Pond 31.3a 1 4a 5 4a 4a -- 5 Murderkill River DE 220-L02 Andrews Lake 17.5a 1 1 5 4a 4a -- 5 Murderkill River DE 220-L03 Coursey Pond 58.1a 11155 -- 5 Murderkill River DE 220-L04 Killen Pond 75.1a 1 4a 3 4a 4a -- 4a Murderkill River DE 220-L05 Mccauley Pond 49.0a 1 1 1 4a 4a -- 4a Lower Naamans Creek Including Its Naamans Creek DE 230-001-01 0.3m 13555 Tributaries -- 5 Upper Naamans Creek Including North Naamans Creek DE 230-001-02 11.0m 13555 Br. And South Br. -- 5 Nanticoke River DE 240-001 Lower Nanticoke River 69.4m 1 4a 1 4a 4a 5 4a Nanticoke River DE 240-002 Upper Nanticoke River 62.3m 1 1 1 4a 4a 5 4a Table III-5 2004 Delaware Surface Water Segment Attainment
Segment Fish advisory Length contaminants, Watershed Segment ID Segment Name (miles) or P Att
N Att metals or area (acres ammonia Avg DO Att Min DO Att. DO Min or sq. miles) Bacterial Att
ERES Attainment Overall Attainment Notes Bacteria 5 from Nanticoke River DE 240-003 Clear Brook Branch 22.9m 4a 4a 5 4a 4a 3 5 prior listing Nanticoke River DE 240-004 Deep Creek Branch 99.2m 1 3 3 4a 4a 3 4a Nanticoke River DE 240-005 Gravelly Branch 61.2m 1 1 5 4a 4a 1 5 Nanticoke River DE 240-006 Bridgeville Branch 9.6m 1 4a 3 4a 4a 3 4a Nanticoke River DE 240-007 Gum Branch 12.1m 13333 3 2 Nanticoke River DE 240-008 Lewes Creek 25.8m 4a 3 3 4a 4a 3 4a Nanticoke River DE 240-009 Dupont Gut 1.0m 33333 -- 3 Nanticoke River DE 240-010 Gum Branch, Upper Nanticoke River 46.7m 13333 3 2 Nanticoke River DE 240-L01 Craigs Pond 11.9a 1 4a 3 4a 4a -- 4a Nanticoke River DE 240-L02 Concord Pond 87.4a 1 1 3 4a 4a 1 4a Nanticoke River DE 240-L03 Collins Pond 90.0a 33333 3 3 Nanticoke River DE 240-L04 Williams Pond 100.0a 1 1 3 4a 4a 5 4a Nanticoke River DE 240-L05 Hearns Pond 67.0a 1 3 3 4a 4a 3 4a Pocomoke River, Headwaters To Pocomoke River DE 250-001 11.8m 13555 Maryland State Line -- 5 Pocomoke River, Tributaries From The Pocomoke River DE 250-002 41.7m 13555 Headwaters To Maryland Line -- 5 Zn, PCBs, Red Clay Creek From Pennsylvania Dioxin, Red Clay Creek DE 260-001 12.8m 1 1 5 4a 4a State Line Chlorinated Pesticides -- 5 Burroughs Run From Pennsylvania Red Clay Creek DE 260-002 4.5m 1 1 5 4a 4a State Line Run -- 5 All Other Red Clay Creek Tributaries Red Clay Creek DE 260-003 Located In The Watershed But Not On 10.3m 33333 the mainstem. -- 3 Red Clay Creek DE 260-L01 Hoopes Reservoir 200.0a 33333 -- 3 PCBs, Red Lion Creek DE 270-001-01 Lower Red Lion Creek 3.7m 53555 Dioxins -- 5 Upper Red Lion Creek, Headwaters To Red Lion Creek DE 270-001-02 6.0m 13555 Route 13 -- 5 Tributaries Located In The Watershed Red Lion Creek DE 270-001-03 But Not On Mainstem of Red Lion 1.8m 33333 Creek -- 3 From The Headwaters Of Chapel Br. To Rehoboth Bay DE 280-001-01 29.8m 13555 The Confluence Of Herring Creek 1 5 Rehoboth Bay DE 280-002 Love Creek 21.5m 13553 1 5 Rehoboth Bay DE 280-E01 Rehoboth Bay 12.0sqm 1 4a 1 4a 4a 1 4a Rehoboth Bay DE 280-L01 Burton Pond 33.0a 11151 1 5 Table III-5 2004 Delaware Surface Water Segment Attainment
Segment Fish advisory Length contaminants, Watershed Segment ID Segment Name (miles) or P Att
N Att metals or area (acres ammonia Avg DO Att Min DO Att. DO Min or sq. miles) Bacterial Att
ERES Attainment Overall Attainment Notes
PCBs, Dioxin, Saint Jones River DE 290-001-01 Lower St. Jones River 12.9m 53555 Mercury, Arsenic -- 5 Saint Jones River DE 290-001-02 Upper St. Jones River 11.2m 53555 -- 5 Tributaries of Saint Jones River From Saint Jones River DE 290-001-03 Old Lebanon Bridge To The Mouth Of 13.6m 33333 Delaware -- 3 Toxics in Saint Jones River DE 290-002 Isaac Branch 17.0m 13555PCBs, Dioxin, Wyoming Mill DDT -- 5 Pond Saint Jones River DE 290-003 Fork Branch 39.5m 53555 -- 5 Nutrient 5s from Saint Jones River DE 290-004 Tidbury Branch 11.5m 53355 -- 5 prior listing Saint Jones River DE 290-L01 Moores Lake 27.1a 13555 PCBs, DDT -- 5
Saint Jones River DE 290-L02 Silver Lake (Dover) 157.8a 13355PCBs, Dioxin, Mercury -- 5 Saint Jones River DE 290-L03 Derby Pond 23.1a 13155 -- 5 PCBs, Shellpot Creek DE 300-001-01 Lower Shellpot Creek 1.0m 13555 Chlordane -- 5 Shellpot Creek DE 300-001-02 Upper Shellpot Creek 14.2m 13555 -- 5 All Other Tributaries To Shellpot Creek Shellpot Creek DE 300-001-03 Located In The Watershed But Not On 7.6m 33333 the mainstem. -- 3 Smyrna River DE 310-001 Smyrna River 10.2m 53555 -- 5 Smyrna River DE 310-002 Mill Creek 6.3m 13555 -- 5 Tributaries of Smyrna River From The Smyrna River DE 310-003 Headwaters To The Confluence With 58.0m 53555 The Delaware River -- 5 5s from prior Smyrna River DE 310-L01 Lake Como & Duck Creek Pond 82.0a 13555 -- 5 listing
White Clay Creek From Pennsylvania Zn White Clay Creek DE 320-001 18.2m 1 1 5 4a 4a State Line Concentrations PCBs 5 5 now below criteria White Clay Creek DE 320-002 Mill Creek 16.6m 1 1 5 4a 4a -- 5 White Clay Creek DE 320-003 Pike Creek 8.2m 1 1 5 4a 1 -- 5 White Clay Creek DE 320-004 Middle Run 5.8m 1 1 5 4a 1 -- 5
FINAL DETERMINATION FOR THE STATE OF DELAWARE 2004 CLEAN WATER ACT SECTION 303(d) LIST OF WATERS NEEDING TMDLs
POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Piedmont Basin Lower Naamans From the mouth at the Delaware River, 0.30 Bacteria NPS 1996 2004 5 DE230-001-01 Naamans Creek 5 Creek upstream to the first railroad bridge miles Nutrients NPS 2002 2004 5 Upper Naamans Creek, including all 7.8 Nutrients NPS 1996 2004 5 tributaries on the North Branch and miles Bacteria NPS 1996 2004 5 First tributary after the headwaters of 1.15 Biology and NPS 1998 2009 5 South Naamans Creek to the mainstem miles Habitat North Branch and DE230-001-02 Naamans Creek 5 South Branch From the confluence of Naamans Creek and West Branch Naamans Creek to the 0.56 Biology and NPS 1998 2009 5 confluence of Naamans Creek and North miles Habitat Branch Naamans Creek Nutrients 1996 2004 5 From the head of tide below the east set DONPS 1996 2004 5 Lower Shellpot 1.0 DE300-001-01 Shellpot Creek 5 of railroad tracks to the mouth of the Bacteria Del. 2002 2004 5 Creek mile Delaware River PCBsRiver 2002 2009 5 Chlordane 2002 2009 5 From the headwaters to the head of tide 7.7 Bacteria NPS 1996 2004 5 below the east set of railroad tracks miles Nutrients NPS 1996 2004 5 Western tributary of the headwaters to 1.4 Biology and Upper Shellpot the confluence of the next larger stream NPS 1998 2009 5 DE300-001-02 Shellpot Creek 5 miles Habitat Creek order From the headwaters of Matson Run to 1.3 Biology and the confluence with mainstem Shellpot NPS 1998 2009 5 miles Habitat Creek Western tributary of the headwaters of 0.63 All other tributaries Stoney Creek to the confluence with Habitat NPS 1998 2009 5 miles located in the mainstem Stoney Creek DE300-001-03 Shellpot Creek 3 watershed but NOT From the confluence of the headwaters of 1.2 Biology and on the mainstem Stoney Creek to the mouth of the NPS 1998 2009 5 miles Habitat Delaware River A low flow TMDL for nutrients and DO is in place for this segment. A high flow TMDL for the same NutrientsPS, 1996 2000 4a/5 2004 parameters is under development with an anticipated 3.8 NPS, DE040-001 Brandywine CreekLower Brandywine 5 Mainstem Lower Brandywine 2005 completion date. miles SF PCBs 1996 2009 5 Bacteria 2002 2004 5 Habitat NPS 1998 2009 5
Table III-6: Delaware 2004 Final 303(d) list 125 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria 1996 2004 5 A low flow TMDL for nutrients and DO is in place PS, for this segment. A high flow TMDL for the same 9.3 Nutrients 1996 2000 4a/5 From State Line to Wilmington NPS, parameters is under development with an anticipated miles DE040-002 Brandywine Creek Upper Brandywine 5 SF 2005 completion date. PCBs 1996 2009 5 Dioxin 2002 2009 5 From State line to the confluence with 8.0 Habitat NPS 1998 2009 5 the Christina River miles Eastern tributary of Beaver Creek, from 0.96 Biology and headwaters to the confluence with NPS 1998 2009 5 miles Habitat mainstem Beaver Creek Tributary originating in Pennsylvania on 0.26 Biology and NPS 1998 2009 5 the western side of Brandywine Creek miles Habitat Tributary of Brandywine Creek, off 0.92 Habitat NPS 1998 2009 5 Route 100 (near PA-DE border) miles Tributary of Brandywine Creek just 0.85 Habitat NPS 1998 2009 5 below Beaver Creek miles All tributaries on Eastern tributary of the headwaters of 1.16 Brandywine Creek Habitat NPS 1998 2009 5 Rocky Run( upper half) miles from the Eastern tributary of the headwaters of 1.16 Biology and DE040-003 Brandywine Creek headwaters at PA- 3 NPS 1998 2009 5 Rocky Run( lower half ) miles Habitat DE line to the From the confluence of the headwaters of 0.64 confluence with the Wilson Run to the next larger stream Habitat NPS 1998 2009 5 miles Christina River order ( lower half ) From the confluence of the headwaters of 0.64 Biology and Wilson Run to the next larger stream NPS 1998 2009 5 miles Habitat order ( upper half ) Wilson Run, from start of the third order 0.88 stream to the confluence with Biology NPS 1998 2009 5 miles Brandywine Creek Tributary of Wilson Run on Montchanin 0.45 Road from the headwaters to the first Habitat NPS 1998 2009 5 miles confluence
Table III-6: Delaware 2004 Final 303(d) list 126 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria 1996 2004 5 A low flow TMDL for nutrients and DO is in place for this segment. A high flow TMDL for the same Nutrients 1996 2000 4a/5 2004 parameters is under development with an anticipated PS, From PA-DE line to the confluence with 12.8 2005 completion date. NPS, White Clay Creek miles Zn 1996 1999 4a 2004 SF PCBs 1996 2009 5 Dioxin 2002 2009 5 DE260-001 Red Clay Creek Mainstem 5 Chlorinated 2002 2009 5 Pesticides From the confluence of West Branch Red 6.4 Clay Creek to the confluence with White Habitat NPS 1998 2009 5 miles Clay Creek ( lower half ) From the confluence of West Branch Red 6.4 Biology and Clay Creek to the confluence with White NPS 1998 2009 5 miles Habitat Clay Creek ( upper half ) 2.6 Bacteria NPS 1996 2004 5 miles From PA-DE line to the confluence with A low flow TMDL for nutrients and DO is in place Red Clay Creek 2.6 for this segment. A high flow TMDL for the same Nutrients NPS 1996 2000 4a/5 2004 DE260-002 Red Clay Creek Burroughs Run 5 miles parameters is under development with an anticipated 2005 completion date. From the confluence of the headwaters of 4.21 Burroughs Run to the confluence with Biology NPS 1998 2009 5 miles Red clay Creek Second tributary below Burroughs Run 1.4 All other tributaries Habitat NPS 1998 2009 5 to the confluence with Red Clay Creek miles located in the DE260-003 Red Clay Creek 3 watershed but NOT Western tributary of the headwaters of Biology and on the mainstem Hyde Run to the confluence with the next 1.2 NPS 1998 2009 5 Habitat larger stream order This segment was listed in 1996, apparently based on earlier reports but no data were used for the listing. 200.0 PS, DE260-L01 Red Clay Creek Reservoir 5 Hoopes Reservoir Bacteria 1996 3 2004 No data has been collected in the interim. The acres NPS Department will study the segment to determine if a listing is appropriate.
Table III-6: Delaware 2004 Final 303(d) list 127 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes PS, Bacteria 1996 2004 5 NPS A low flow TMDL for nutrients and DO is in place PS, for this segment. A high flow TMDL for the same Nutrients 1996 2000 4a/5 2004 NPS parameters is under development with an anticipated 2005 completion date. From the PA-DE line to the confluence 15.6 Zn (below with the Christina River miles PS, Paper Mill 1996 1999 1 2004 Zinc, listed in 1999 delisted 2004 based on improved NPS DE320-001 White Clay Creek Mainstem 5 Road) water quality PCBs (River PS, mouth to Paper 1996 2009 5 NPS Mill Road) From the confluence of East Branch White Clay Creek and West Branch 16.2 Biology and NPS 1998 2009 5 White Clay Creek to the confluence with miles Habitat the Christina River Bacteria NPS 1996 2004 5 A low flow TMDL for nutrients and DO is in place From the headwaters to the confluence 8.3 for this segment. A high flow TMDL for the same with White Clay Creek miles Nutrients NPS 1996 2000 4a/5 2004 parameters is under development with an anticipated 2005 completion date. From the confluence of the headwaters of 0.27 Biology and Mill Creek to the confluence with the NPS 1998 2009 5 miles Habitat next larger stream order DE320-002 White Clay Creek Mill Creek 5 Second western tributary-- From the 0.04 Habitat NPS 1998 2009 5 headwaters of mainstem Mill Creek miles From the confluence of the headwaters of 1.64 Mill Creek to the confluence with White Habitat NPS 1998 2009 5 miles Clay Creek ( upper half )
From the confluence of the headwaters of 1.64 Biology and Mill Creek to the confluence with White NPS 1998 2009 5 miles Habitat Clay Creek ( lower half )
Table III-6: Delaware 2004 Final 303(d) list 128 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes A low flow TMDL for nutrients and DO is in place for this segment. A high flow TMDL for the same From the headwaters to the confluence 5.4 Nutrients NPS 1996 2000 4a/5 2004 parameters is under development with an anticipated with White Clay Creek miles 2005 completion date. Bacteria NPS 1996 2004 5 Third eastern tributary after the 0.21 Biology NPS 1998 2009 5 headwaters of Pike Creek ( upper half ) miles DE320-003 White Clay Creek Pike Creek 5 Third eastern tributary after the 0.21 Biology and NPS 1998 2009 5 headwaters of Pike Creek ( lower half ) miles Habitat Second eastern tributary after the 0.96 Biology and NPS 1998 2009 5 headwaters of Pike Creek miles Habitat From the confluence of the headwaters of 4.7 Biology and Pike Creek to the confluence with White NPS 1998 2009 5 miles Habitat Clay Creek Bacteria NPS 1996 2004 5 A low flow TMDL for nutrients and DO is in place From the headwaters to the confluence 4.5 for this segment. A high flow TMDL for the same with White Clay Creek miles Nutrients NPS 1996 2000 4a/5 2004 parameters is under development with an anticipated 2005 completion date. Eastern tributary of the headwaters of 0.89 Middle Run to the confluence of the next Biology NPS 1998 2009 5 miles DE320-004 White Clay Creek Middle Run 5 larger stream order ( upper half )
Eastern tributary of the headwaters of 0.89 Biology and Middle Run to the confluence of the next NPS 1998 2009 5 miles Habitat larger stream order ( lower half ) Western tributary of the headwaters of 1.3 Middle Run to the confluence with the Habitat NPS 1998 2009 5 miles mainstem First tributary after State line to the 1.1 confluence of White Clay Creek, along Habitat NPS 1998 2009 5 miles Thompson Station Road 0.38 All tributaries from Tributary off The Hunt at Louviers Biology NPS 1998 2009 5 miles the headwaters to DE320-005 White Clay Creek 3 the confluence with Tributary off White Clay Creek that 0.38 Biology NPS 1998 2009 5 the Christina River parallels Paper Mill Road-- Jennys Run miles First tributary after Pike Creek--from the 1.1 headwaters to the confluence with White Habitat NPS 1998 2009 5 miles Clay Creek
Table III-6: Delaware 2004 Final 303(d) list 129 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes A low flow TMDL for nutrients and DO is in place NPS, for this segment. A high flow TMDL for the same Nutrients 1996 2001 4a/5 2004 SF parameters is under development with an anticipated 2005 completion date. NPS, DO, listed in 1996, Delisted 2002 based on 2002 DO 1996 1 2002 Lower Christina 1.5 SF 305(b) report DE120-001 Christina River 5 Mainstem Lower Christina River River miles NPS, PCBs 1996 2009 5 SF PS,NP Bacteria 2002 2004 5 S PS, Dieldrin 2002 2009 5 NPS A low flow TMDL for nutrients and DO is in place for this segment. A high flow TMDL for the same Nutrients NPS 1996 2001 4a/5 2004 parameters is under development with an anticipated Between White Clay Creek and 7.5 2005 completion date. DE120-002 Christina River Mid Christina River 5 Brandywine River miles PCBs SF 1996 2009 5 PS, Bacteria 2002 2004 5 NPS Dieldrin NPS 2002 2009 5 A low flow TMDL for nutrients and DO is in place NPS, for this segment. A high flow TMDL for the same Nutrients 1996 2001 4a/5 2004 PS parameters is under development with an anticipated 2005 completion date. NPS, PCBs 1996 2009 5 6.3 PS Mainstem Upper Christina River miles NPS, Bacteria 1996 2004 5 PS Upper Christina DE120-003 Christina River 5 A low flow TMDL for nutrients and DO is in place River NPS, for this segment. A high flow TMDL for the same DO 2004 2001 4a/5 2004 PS parameters is under development with an anticipated 2005 completion date. Segments from Smalley’s Pond overflow 5.77 Biology and NPS 1998 2009 5 to the confluence with White Clay Creek miles Habitat Tributary downstream of Smalleys Pond 0.65 Biology NPS 1998 2009 5 on the Christina River miles Biology and NPS 1998 2009 5 Habitat
Lower Christina Tributary from Smalleys Pond overflow 1.0 Nutrients NPS 2002 2001 4a/5 2004 A low flow TMDL for nutrients and DO is in place DE120-003-02 Christina River 5 Creek to White Clay Creek mile for this segment. A high flow TMDL for the same parameters is under development with an anticipated DO NPS 2002 2001 4a/5 2004 2005 completion date. Bacteria NPS 2002 2004 5
Table III-6: Delaware 2004 Final 303(d) list 130 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS, 1996 2004 5 A low flow TMDL for nutrients and DO is in place for this segment. A high flow TMDL for the same Nutrients NPS 1996 2001 4a/5 2004 parameters is under development with an anticipated 2005 completion date. 8.4 Mainstem Lower Christina Creek NPS, miles PCBs 1996 2009 5 Lower Christina SF DE120-004-01 Christina River 5 Creek A low flow TMDL for nutrients and DO is in place for this segment. A high flow TMDL for the same DO NPS 2002 2001 4a/5 2004 parameters is under development with an anticipated 2005 completion date. From the confluence of West Branch 6.0 Biology and Christina River to the confluence with NPS 1998 2009 5 miles Habitat the mainstem Bacteria NPS 1996 2004 5 From the headwaters above Becks Pond 3.8 A low flow TMDL for nutrients and DO is in place to the confluence with the Christina Nutrients NPS 2002 2004 4a/5 miles for this segment. A high flow TMDL for the same River parameters is under development with an anticipated DE120-004-02 Christina River Belltown Run 5 DO NPS 2002 2004 4a/5 2005 completion date. Eastern tributary of the headwaters of 4.2 Biology and Belltown Run to the confluence with the NPS 1998 2009 5 miles Habitat Christina River Western tributary of the headwaters of 0.88 Habitat NPS 1998 2009 5 Belltown Run to its confluence miles From the headwaters above Sunset Pond 8.0 to the confluence with Belltown Run Bacteria NPS 1996 2004 5 miles below Becks Pond From the headwaters of Iron Hill Run to 2.3 Habitat NPS 1998 2009 5 the next larger stream order miles Eastern tributary of the headwaters of 0.71 DE120-004-03 Christina River Muddy Run 5 Iron Hill Run to the next larger stream Habitat NPS 1998 2009 5 miles order Eastern tributary above Sunset Pond to 2.3 the confluence of the next larger stream Biology NPS 1998 2009 5 miles order Eastern tributary of the headwaters of 0.63 Habitat NPS 1998 2009 5 Muddy Run to its confluence miles Bacteria NPS 1996 2004 5 A low flow TMDL for nutrients and DO is in place West Branch including Persimmon Run 5.3 DE120-005-01 Christina River West Branch 5 for this segment. A high flow TMDL for the same and Stine Haskell Branch miles Nutrients NPS 1996 2001 4a/5 2004 parameters is under development with an anticipated 2005 completion date.
Table III-6: Delaware 2004 Final 303(d) list 131 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS 1996 2004 5 A low flow TMDL for nutrients and DO is in place 8.3 Mainstem Upper Christina Creek for this segment. A high flow TMDL for the same miles Nutrients 1996 2001 4a/5 2004 parameters is under development with an anticipated 2005 completion date. From the confluence of the headwaters of 2.6 Biology and Upper Christina River to the confluence 1998 2009 5 miles Habitat Upper Christina of West Branch DE120-006 Christina River 5 Creek First western tributary after the headwaters of the Upper Christina River 0.67 Habitat 1998 2009 5 to mainstem Upper Christina River ( miles upper half) First western tributary after the headwaters of the Upper Christina River 0.67 Biology and 1998 2009 5 to mainstem Upper Christina River ( miles Habitat lower half ) Bacteria NPS 1996 2004 5 A low flow TMDL for nutrients and DO is in place for this segment. A high flow TMDL for the same From the confluence of Willow Run and Nutrients NPS 1996 2001 4a/5 2004 5.1 parameters is under development with an anticipated Chestnut Run to the confluence with the miles 2005 completion date. Christina River DO, listed in 1996, Delisted 2002 based on 2002 DO 1996 1 2002 305(b) report PCBs NPS 1996 2009 5 First western tributary after the headwaters of Little Mill Creek to the 1.4 Little Mill Creek Habitat NPS 1998 2009 5 DE120-007-01 Christina River 5 confluence with mainstem Little Mill miles and Willow Run Creek From the headwaters of Willow Run to 0.54 Habitat NPS 1998 2009 5 the confluence with the Christina River miles From the confluence of the headwaters of 4.4 Biology and Little Mill Creek to the confluence of NPS 1998 2009 5 miles Habitat Chestnut Run Little Mill Creek--from the confluence of 3.4 Biology and Chestnut Run to the confluence with the NPS 1998 2009 5 miles Habitat Christina River From the headwaters of Chestnut Run to 2.8 Bacteria NPS 1996 2004 5 the confluence with the Christina River miles Eastern tributary of the headwaters of 1.1 DE120-007-02 Christina River Chestnut Run 5 Chestnut Run to the confluence of the Habitat NPS 1998 2009 5 miles next larger stream order Left tributary of the headwaters of 0.43 Biology and Chestnut Run to the confluence of the NPS 1998 2009 5 miles Habitat next larger stream order
Table III-6: Delaware 2004 Final 303(d) list 132 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS 1996 2004 5 30.0 Nutrients NPS 1996 2004 5 DE120-L01 Christina River Smalleys Pond 5 Smalleys Pond east of Newark acres PCBs NPS 1996 2009 5 DO NPS 2004 2004 5 Bacteria NPS 1996 2004 5 Nutrients, listed in 1996, Delisted 2002 based on 25.6 Nutrients NPS 1996 1 2002 DE120-L02 Christina River Becks Pond5 Becks Pond southeast of Newark 2002 305(b) report acres PCBs NPS 2002 2009 5 Mercury NPS 2002 2009 5 Bacteria NPS 1996 2004 5
40.0 A low flow TMDL for nutrients and DO is in place DE120-L03 Christina River Sunset Pond5 Sunset Pond south of Newark Nutrients NPS 2002 2004 4a/5 acres for this segment. A high flow TMDL for the same parameters is under development with an anticipated DO NPS 1996 2004 5 2005 completion date.
Table III-6: Delaware 2004 Final 303(d) list 133 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes CHESAPEAKE BAY BASIN Bacteria NPS 1996 2005 5 6.6 Mainstem Nutrients NPS 2002 2005 5 miles DO NPS 1996 2005 5 Chesapeake Drainage Cypress Branch, Cypress Branch--from the confluence of 1.60 Biology NPS 1998 2010 5 DE100-001 5 System including tributaries Black Stallion Ditch to the MD-DE line miles DO NPS 1998 2005 5 Tributary of Cypress Branch--from the 0.35 confluence of the headwaters to the Biology NPS 1998 2010 5 miles confluence with the mainstem Bacteria NPS 1996 2005 5 7.2 Mainstem DO NPS 1996 2005 5 miles Nutrients NPS 1996 2005 5 Chesapeake Drainage Sewell Branch, From the confluence of the headwaters to Biology and DE100-002 5 NPS 1998 2010 5 System including tributaries the confluence with Sewell Branch Habitat 8.20 miles From the confluence of the headwaters to DO NPS 1998 2005 5 the confluence with Sewell Branch Bacteria NPS 1996 2005 5 7.7 Mainstem DO NPS 1996 2005 5 miles Nutrients NPS 1996 2005 5 Gravelly Run--from the confluence of 1.08 Habitat NPS 1998 2010 5 Jamison Branch to the MD-DE line miles Tributary of Gravelly Run--from the 0.22 headwaters to the confluence with the Habitat NPS 1998 2010 5 miles mainstem Tributary of Gravelly Run--first western 1.21 Biology and NPS 1998 2010 5 Chesapeake Drainage Gravelly Run, tributary upstream of Gravelly Run miles Habitat DE100-003 5 System including tributaries Tributary of Gravelly Run--second 1.25 eastern tributary from the headwaters of Habitat NPS 1998 2010 5 miles Gravelly Run to the mainstem Gravelly Run--from the start of the third 2.28 Biology and order stream to the confluence with NPS 1998 2010 5 miles Habitat Jamison Branch From the confluence of Gravelly Run and 1.14 Biology and NPS 1998 2010 5 Jamison Branch to the MD-DE line miles Habitat First eastern tributary after the 1.55 Habitat NPS 1998 2010 5 Chesapeake Drainage Tributaries of Elk headwaters of Great Bohemia Creek miles DE100-004 3 System River Eastern tributary of the headwaters of 1.26 Biology NPS 1998 2010 5 Back Creek to its confluence miles
Table III-6: Delaware 2004 Final 303(d) list 134 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Western tributary of the headwaters of 1.92 Biology NPS 1998 2010 5 Sassafras River to its confluence miles Chesapeake Drainage Tributaries of DE100-005 3 From the confluence of the headwaters of System Sassafras River 0.95 Biology and Sassafras River to the next larger stream NPS 1998 2010 5 miles Habitat order Bacteria NPS 1996 2005 5 7.5 Mainstem DO NPS 1996 2005 5 miles Nutrients NPS 1996 2005 5 From start of the fourth order stream to 6.58 Biology and NPS 1998 2010 5 the confluence with Tidy Island Creek miles Habitat Start of third order stream on 1.12 Biology and Tappahanna Ditch to the confluence of NPS 1998 2010 5 miles Habitat the next larger stream order First western tributary after the 0.40 headwaters of Tappahanna Ditch to its Habitat NPS 1998 2010 5 miles confluence Tidy Island Creek--from the confluence DE110-001 Choptank Tappahanna Ditch 5 0.21 with Tappahanna Ditch to the MD-DE Habitat NPS 1998 2010 5 miles line Choptank River--from the start of the 2.31 Biology and third order stream to the confluence with NPS 1998 2010 5 miles Habitat Choptank River Seventh eastern tributary upstream of 1.30 Habitat NPS 1998 2010 5 Tappahanna Ditch miles DO NPS 1998 2005 5 Tributary of Tappahanna Ditch--western 0.38 Biology and tributary of the headwaters to its NPS 1998 2010 5 miles Habitat confluence Second western tributary after the 0.88 Biology and headwaters of Tappahanna Ditch to its NPS 1998 2010 5 miles Habitat confluence
Table III-6: Delaware 2004 Final 303(d) list 135 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS 1996 2005 5 10.0 Mainstem DO NPS 1996 2005 5 miles Nutrients NPS 1996 2005 5 Luther Marvel Prong--from the 1.07 Biology and confluence of the headwaters to the NPS 1998 2010 5 miles Habitat confluence with Culbreth Marsh Ditch From the confluence of Powell Ditch to 1.31 Habitat NPS 1998 2010 5 the confluence with Ross Prong miles Culbreth Marsh Ditch--from start of the 1.79 fourth order stream to the confluence Habitat NPS 1998 2010 5 miles with Mud Millpond ( lower half ) Biology and Culbreth Marsh Culbreth Marsh Ditch--from start of the NPS 1998 2010 5 DE110-002 Choptank 5 1.79 Habitat Ditch fourth order stream to the confluence miles DO NPS 1998 2010 5 with Mud Millpond ( upper half ) Temperature NPS 1998 2010 5 Culbreth Marsh Ditch--from the confluence of Ross Prong to the 3.62 Biology and NPS 1998 2010 5 confluence with the next larger stream miles Habitat order Culbreth Marsh Ditch--from the 1.86 confluence of Mud Millpond to the Biology NPS 1998 2010 5 miles confluence of Cow Marsh Creek Third western tributary upstream of 1.99 Biology and NPS 1998 2010 5 Culbreth Marsh Ditch miles Habitat Ross Prong--from the confluence of the 2.61 Biology and headwaters to the confluence with NPS 1998 2010 5 miles Habitat Culbreth Marsh Ditch
Table III-6: Delaware 2004 Final 303(d) list 136 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS 1996 2005 5 15.1 Mainstem DO NPS 1996 2005 5 miles Nutrients NPS 1996 2005 5 First upstream tributary on Meredith 0.46 Habitat NPS 1998 2010 5 Branch miles From the confluence of the headwaters of 1.98 Biology and Sangston Prong to the confluence NPS 1998 2010 5 miles Habitat Gravelly Branch Tributary of Gary Mill Pond Branch-- from the confluence of the headwaters to 1.00 Biology and NPS 1998 2010 5 the confluence with Gary Mill Pond miles Habitat Branch First eastern tributary after the 1.21 Biology and NPS 1998 2010 5 headwaters of Wildcat Branch miles Habitat Willow Grove Prong--from the start of 1.24 Biology and the third order stream to the confluence NPS 1998 2010 5 miles Habitat with Cow Marsh Creek Tributary of Cow Marsh Creek--first 1.32 eastern tributary upstream of Cow Biology NPS 1998 2010 5 miles Marsh Creek Cow Marsh Ditch--from start of third 1.44 order stream to the confluence with Cow Habitat NPS 1998 2010 5 miles Marsh Creek DE110-003 Choptank Cow Marsh Creek 5 Cow Marsh Ditch--from the confluence 1.49 of the headwaters to the confluence with Habitat NPS 1998 2010 5 miles the next larger stream order Bullock Prong--mainstem to the 3.12 Habitat NPS 1998 2010 5 confluence with Price Prong miles Third tributary upstream of Cow Marsh 1.86 Ditch--from the headwaters to the Habitat NPS 1998 2010 5 miles confluence with Cow Marsh Ditch Iron Mine Prong--from the confluence of 2.02 Black Swamp to the next larger stream Habitat NPS 1998 2010 5 miles order Meredith Branch--from the start of the 2.08 Biology and third stream order to the confluence with NPS 1998 2010 5 miles Habitat the next larger stream order White Marsh Branch--from the start of the third order stream to the confluence 2.92 Biology NPS 1998 2010 5 with Gravelly Branch and Sangston miles Prong Cow Marsh Creek--from the confluence 4.97 of Iron Mine Prong to the confluence Habitat NPS 1998 2010 5 miles with Choptank River
Table III-6: Delaware 2004 Final 303(d) list 137 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS 1996 2005 5 60.0 DE110-L01 Choptank Mud Mill Pond 5 Pond south of Marydel DO NPS 1996 2005 5 acres Nutrients NPS 1996 2005 5 Bacteria NPS 1996 2005 5 19.7 From the headwaters to the State Line DO NPS 1996 2005 5 miles Nutrients NPS 1996 2005 5 Tributary to Black Arm Prong--third 0.56 Habitat NPS 1998 2010 5 tributary upstream of Black Arm Prong miles DE200-001 Marshyhope Creek Marshyhope Creek 5 Marshyhope Creek--from the confluence 8.78 of Prospect Branch to the confluence Habitat NPS 1998 2010 5 miles with the MD-DE line From the confluence of Black Prong and 4.50 Biology and Marshyhope Ditch to the confluence of NPS 1998 2010 5 miles Habitat Prospect Branch DO NPS 2002 2005 5 6.26 Marshyhope Ditch Nutrients NPS 2002 2005 5 Miles Bacteria NPS 2002 2005 5 First tributary upstream of Prong No. 2-- 0.55 from the eastern headwater to its Habitat NPS 1998 2010 5 miles confluence Point Branch--from the headwaters to the 0.80 confluence with the first tributary Habitat NPS 1998 2010 5 miles downstream Tributary of Tomahawk Branch--third 1.54 Tributaries from the eastern tributary downstream of the Habitat NPS 1998 2010 5 miles DE200-002 Marshyhope Creekheadwaters to the 5 headwaters State line Tributary of Tomahawk Branch--first 0.69 Habitat NPS 1998 2010 5 eastern tributary upstream miles Tributary of Salisbury Creek--from the 0.82 Biology and MD-DE line to the confluence with NPS 1998 2010 5 miles Habitat Salisbury Creek Salisbury Creek--from the start of the 0.60 Biology and third order stream to the confluence with NPS 1998 2010 5 miles Habitat Cattail Branch ( upper half ) Salisbury Creek--from the start of the 0.60 third order stream to the confluence with Habitat NPS 1998 2010 5 miles Cattail Branch ( lower half )
Table III-6: Delaware 2004 Final 303(d) list 138 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Prospect Branch--western tributary of the 1.25 Habitat NPS 1998 2010 5 headwaters to its confluence miles Prong No. 2--from the start of the third 1.50 Biology and order stream to the confluence with NPS 1998 2010 5 miles Habitat Bright-Haines Glade Branch From the confluence of the headwaters of 3.51 Biology and Green Branch to the confluence with NPS 1998 2010 5 miles Habitat Marshyhope Creek Tributary of Salisbury Creek--from the 1.21 Biology and MD-DE line to the confluence with NPS 1998 2010 5 miles Habitat Salisbury Creek Short and Hall Ditch--from the 1.45 confluence of the headwaters of with Habitat NPS 1998 2010 5 miles Marshyhope Creek Brights Branch--from the start of the 1.78 Habitat NPS 1998 2010 5 third order stream to the MD-DE line miles Bright-Haines Glade Branch--from the Habitat NPS 1998 2010 5 1.30 start of the fourth order stream and DO NPS 1998 2010 5 miles Prospect Branch to the confluence with Temperature NPS 1998 2010 5 Cattail Branch--from the start of the 2.17 Biology and fourth order stream to the confluence NPS 1998 2010 5 miles Habitat with Salisbury Creek ( upper half ) Tributaries from the Habitat NPS 1998 2010 5 Marshyhope Creek headwaters to the 5 Cattail Branch--from the start of the 2.17 DO NPS 1998 2010 5 State line fourth order stream to the confluence miles with Salisbury Creek ( lower half ) Temperature NPS 1998 2010 5 Tributary to Black Arm Prong--second 0.52 Habitat NPS 1998 2010 5 tributary after the headwaters miles Eastern tributary of the headwaters of 0.87 Habitat NPS 1998 2010 5 Cattail Branch to its confluence miles From the confluence of the headwaters of 2.34 Biology and Green Branch to the confluence NPS 1998 2010 5 miles Habitat Marshyhope Creek Tributary to Cattail Branch--fourth 1.08 Biology and western tributary downstream of the NPS 1998 2010 5 miles Habitat headwaters of Cattail Branch Tributary of Prong No. 2--from the start of the third order stream to the 1.50 Habitat NPS 1998 2010 5 confluence with Bright-Haines Glade miles Branch Tributary to Cattail Branch--third 1.06 western tributary upstream of Salisbury Habitat NPS 1998 2010 5 miles Creek Tributary to Tomahawk Branch--first 0.95 Habitat NPS 1998 2010 5 western tributary after the headwaters miles
Table III-6: Delaware 2004 Final 303(d) list 139 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes PS, Bacteria, listed in 1996, Delisted 2004 based on 2004 Bacteria 1996 1 2004 NPS 305(b) assessment Lower Nanticoke From the head of tide in Middleford to 15.1 PS, DE240-001 Nanticoke River 4a Nutrients 1996 1998 4a 2004 River the MD-DE State line miles NPS PS, DO 1996 1998 4a 2004 NPS PS, Bacteria, listed in 1996, Delisted 2004 based on 2004 Bacteria 1996 1 2004 NPS 305(b) assessment From the headwaters of the Nanticoke 18.6 PS, Nutrients 1996 1998 4a 2004 River to the head of tide at Middleford miles NPS DO, listed in 1996, Delisted 2002 based on 2002 DO 1996 1998 1 2002 305(b) report. Tributary of White Marsh Branch--first 0.49 western tributary downstream of the Habitat NPS 1998 2010 5 miles headwaters of White Marsh Branch Kent-Sussex Line Branch--from the start of the third order stream to the 1.33 Habitat NPS 1998 2010 5 confluence with Nanticoke River (lower miles half ) Kent-Sussex Line Branch--from the start of the third order stream to the 1.33 Biology and NPS 1998 2010 5 Upper Nanticoke confluence with Nanticoke River miles Habitat DE240-002 Nanticoke River 4a River (upper half ) Nanticoke Branch--from the confluence 2.48 of Polk Branch to the confluence with Habitat NPS 1998 2010 5 miles Gum Branch Grubby Neck Branch--from the 1.24 confluence of Polk Branch to the Habitat NPS 1998 2010 5 miles confluence with Gum Branch Nanticoke Branch--from the confluence 5.23 of Kent-Sussex Line Branch to the Habitat NPS 1998 2010 5 miles confluence with Cart Branch Nanticoke River--from the start of the 3.13 Biology and third order stream to the confluence with NPS 1998 2010 5 miles Habitat Kent-Sussex Line Branch. Tributary to Marsh Branch--first eastern 0.83 tributary after the headwaters to its Habitat NPS 1998 2010 5 miles confluence From the headwaters of Clear Brook, Bacteria NPS 1996 2005 5 12.9 DE240-003 Nanticoke River Clear Brook Branch 5 Friedel Prong, and Bucks Branch to the Nutrients NPS 1996 2000 4a 2004 miles confluence with Williams Pond DO NPS 1996 2000 4a 2004
Table III-6: Delaware 2004 Final 303(d) list 140 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes From the headwaters above Concord Bacteria NPS 1996 2005 5 Pond to the confluence with the 5.5 Nanticoke River, excluding Concord miles Nutrients NPS 1996 2000 4a 2004 Pond McColleys Branch--from the confluence 3.24 of New Ditch to the confluence with Habitat NPS 1998 2010 5 miles Deep Creek DE240-004 Nanticoke River Deep Creek Branch 5 Deep Creek--from the start of the third 2.51 order stream to the confluence with Habitat NPS 1998 2010 5 miles Deep Creek and McColleys Branch Tyndall Branch--from the start of the third order stream on Stoney Creek to 5.00 Habitat NPS 1998 2010 5 the confluence of Tyndall Branch and miles Deep Creek From the headwaters of Gravelly Branch 6.5 Bacteria NPS 1996 2005 5 above Collins Pond to the confluence miles Nutrients NPS 1996 2000 4a 2004 Gravelly Branch--from the start of the 2.12 third order stream to the confluence with Habitat NPS 1998 2010 5 miles the next larger stream order DE240-005 Nanticoke River Gravelly Branch 5 Prong No. 1--from the start of fourth 0.73 order stream to the confluence with Habitat NPS 1998 2010 5 miles Gravelly Branch on Nanticoke River Maple Branch-- from the start of the 1.0 third order stream to the confluence with Habitat NPS 1998 2010 5 mile Prong No. 1 From the headwaters of Bridgeville Bacteria NPS 1996 2005 5 7.2 Branch to the confluence with Nanticoke Nutrients NPS 1996 2000 4a 2004 miles River DO NPS 1996 2000 4a 2004 DE240-006 Nanticoke River Bridgeville Branch 5 Bridgeville Branch---from the start of the 3.92 third order stream to the confluence with Habitat NPS 1998 2010 5 miles Nanticoke River From the headwaters located northeast of 6.0 Bacteria NPS 1996 2005 5 Woodland Ferry to the confluence with miles Nutrients NPS 1996 2000 4a 2004 DE240-007 Nanticoke River Gum Branch 5 Gum Branch.--from the start of the third 2.37 order stream to the confluence with Habitat NPS 1998 2010 5 miles Nanticoke River Bacteria NPS 1996 2005 5 Lewes Creek, including Butler Mill 10.3 DE240-008 Nanticoke River Lewes Creek 5 Nutrients NPS 1996 2000 4a 2004 Branch and Chapel Branch miles DO NPS 2002 2000 4a 2004 DuPont Gut has been determined by USEPA not to be Waters of the U.S. , 1.0 DE240-009 Nanticoke River DuPont Gut n/a therefore the prior listing was withdrawn Temperature PS 1996 2002 mile in 2002. This information is provided for Temperature, listed in 1996, Delisted 2002 based on continuity with prior 303(d) lists. new information and US EPA findings.
Table III-6: Delaware 2004 Final 303(d) list 141 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Gum Branch--from the confluence of 3.51 Stallion Head Branch to the confluence Habitat NPS 1998 2010 5 Gum Branch on miles with West Branch Gum Branch DE240-010 Nanticoke River Upper Nanticoke 4c River Toms Dam Branch--from the start of the 5.23 third order stream to the confluence with Habitat NPS 1998 2010 5 miles Gum Branch Bacteria NPS 1996 2005 5 Pond southwest of Seaford and below 11.9 DE240-L01 Nanticoke River Craigs Pond 5 Nutrients NPS 1996 2000 4a 2004 Butler Mill Branch acres DO NPS 2002 2000 4a 2004 Pond east of Seaford on Deep Creek 87.4 DE240-L02 Nanticoke River Concord Pond 4a Nutrients NPS 1996 2000 4a 2004 Branch acres Pond located in Seaford and below 100.0 Nutrients NPS 1996 2000 4a 2004 DE240-L04 Nanticoke River Williams Pond 5 Middleford acres Bacteria NPS 2002 2005 5 Pond located north of Seaford on Clear 67.0 Bacteria NPS 1996 2005 5 DE240-L05 Nanticoke River Hearns Pond 5 Brook Branch acres Nutrients NPS 1996 2000 4a 2004 PS, Bacteria 1996 2005 5 NPS Lower Broad Creek, including Collins 24.8 PS, and Culvert Ditch, Holly Ditch, and Nutrients 1996 1998 4a 2004 miles NPS Rossakatum and Cooper Branches PS, DE050-001 Broad Creek Lower Broad Creek 5 DO 2002 1998 4a 2004 NPS Cooper Branch--from the start of the 2.73 third order stream on Rossakatum Habitat NPS 1998 2010 5 miles Branch to the confluence of Broad Creek Tributary west of Laurel, excluding 7.9 Bacteria NPS 1996 2005 5 Portsville and Tussock Ponds miles Nutrients NPS 1996 2000 4a 2004 DE050-002 Broad Creek Tussocky Branch 5 Tussocky Branch--from the confluence 3.42 of Mill Creek to the confluence with Habitat NPS 1998 2010 5 miles Broad Creek Tributary south of Laurel, excluding 2.4 DE050-003 Broad Creek Little Creek 5 Bacteria NPS 1996 2005 5 Horsey’s Pond miles Tributary northeast of Laurel, excluding 6.7 Bacteria NPS 1996 2005 5 Chipman Pond miles Nutrients NPS 1996 2000 4a 2004 Jobs Ditch--from the headwaters to the 0.98 Habitat NPS 1998 2010 5 confluence with Dukes and Jobs Branch miles Chipman Pond DE050-004 Broad Creek 5 Mirey Branch--from the start of the third Branch 1.28 order stream to the confluence with Habitat NPS 1998 2010 5 miles Elliott Pond Branch Dukes Ditch--from the headwaters to the 2.45 Habitat NPS 1998 2010 5 confluence with Dukes and Jobs Branch miles James Branch, including Pepper Pond Bacteria NPS 1996 2005 5 11.1 DE050-005-01 Broad Creek James Branch 5 Branch, Hitch Pond Branch, and Grays Nutrients NPS 1996 2000 4a 2004 miles Branch DO NPS 2002 2000 4a 2004
Table III-6: Delaware 2004 Final 303(d) list 142 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes From the headwaters to the confluence 3.5 with James Branch, excluding Trussum Bacteria NPS 1996 2005 5 miles Trussum Pond Pond DE050-005-02 Broad Creek 5 Branch Wards Branch--from the confluence of 3.18 the headwaters to the confluence with DO NPS 1998 2000 4a 2004 miles James Branch From the headwaters of Trap Pond 2.9 Bacteria NPS 1996 2005 5 DE050-006-01 Broad Creek Trap Pond Branch 5 including Saunders and Thompson miles Nutrients NPS 1996 2000 4a 2004 Bacteria NPS 2002 2005 5 Headwaters of Raccoon Pond and Trap 9.11 DE050-006-03 Broad Creek Raccoon Prong 5 Nutrients NPS 2002 2000 4a 2004 pond miles DO NPS 2002 2000 4a 2004 14.5 Bacteria NPS 1996 2005 5 DE050-L01 Broad Creek Portsville Pond 5 Pond west of Laurel on Tussocky Branch acres Nutrients NPS 1996 2000 4a 2004 8.6 Bacteria NPS 2002 2005 5 DE050-L02 Broad Creek Tussock Pond 5 Pond southwest of Laurel acres Nutrients NPS 2002 2000 4a 2004 Bacteria , listed in 1996, Delisted 2004 based on Pond south of Laurel on Little Creek 46.3 Bacteria NPS 1996 1 2004 DE050-L03 Broad Creek Horseys Pond 4a 2004 305(b) assessment tributary acres Nutrients NPS 1996 2000 4a 2004 PS, Bacteria 1996 2005 5 NPS 91.9 PS, DE050-L04 Broad Creek Records Pond 5 Pond adjacent to Laurel Nutrients 1996 2000 4a 2004 acres NPS DO, listed in 1996, Delisted 2002 based on 2002 DO 1996 1 2002 305(b) report Pond located north of Laurel on Chipman 47.0 Nutrients NPS 1996 2000 4a 2004 DE050-L05 Broad Creek Chipman Pond 5 Branch acres Bacteria NPS 2002 2005 5 Bacteria NPS 1996 2005 5 Pond southeast of Laurel on James 58.7 DE050-L06 Broad Creek Trussum Pond 5 Nutrients NPS 1996 2000 4a 2004 Branch acres DO NPS 2002 2000 4a 2004 Nutrients NPS 1996 2000 4a 2004 Pond east of Laurel on Hitch Pond 88.0 DO NPS 2002 2000 4a 2004 DE050-L07 Broad Creek Trap Pond 4a Branch acres Bacteria, listed in 1996, Delisted 2002 based on 2002 Bacteria 1996 1 2002 305(b) report Bacteria NPS 1996 2005 5 Pond east of Laurel on Hitch Pond 13.5 DE050-L08 Broad Creek Raccoon Pond 5 Nutrients NPS 1996 2000 4a 2004 Branch acres DO NPS 2002 2000 4a 2004 Bacteria NPS 1996 2005 5 Pocomoke River, from headwaters to the 11.8 DO NPS 1996 2005 5 MD-DE State line miles Nutrients NPS 1996 2005 5 Pocomoke River--from the confluence of 0.99 Bald Cypress Branch and Gum Branch to Habitat NPS 1998 2010 5 DE250-001 Pocomoke River Pocomoke River 5 miles the MD-DE line Pocomoke River--from start of the third 4.55 order stream to the confluence with Bald Habitat NPS 1998 2010 5 miles Cypress Branch and Gum Branch Tributaries from the Bald Cypress Branch--from the Habitat NPS 1998 2010 5 3.5 DE250-002 Pocomoke River headwaters to MD- 5 confluence of the headwaters to the Bacteria NPS 2004 2005 5 miles DE State line confluence with the next larger stream Nutrients NPS 2004 2005 5
Table III-6: Delaware 2004 Final 303(d) list 143 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes INLAND BAYS/ATLANTIC OCEAN BASIN PS, Bacteria 1996 2006 5 NPS Tidal waters from the confluence of Lewes and 8.9 PS, DE170-001 Lewes and Rehoboth Canal 5 Delaware Bay to the confluence with Nutrients 1996 2003 5 Rehoboth Canal miles NPS Rehoboth Bay 1996 , DO, listed in 1996, Delisted 2002 based on 2002 DO 2003 5 2004 305(b) report and relisted 2004. From the headwaters of Chapel Branch Bacteria NPS 1996 2006 5 to the confluence of Herring Creek, 27.0 Nutrients NPS 1996 2003 5 including Hopkins Prong, Unity Branch, miles DO, listed in 1996, Delisted 2004 based on 2004 DO NPS 1996 1 2004 DE280-001-01 Rehoboth Bay Chapel Branch 5 Phillips Branch, and Guinea Creek 305(b) Assessment Chapel Branch--from the start of the 3.75 second order stream to the confluence Habitat NPS 1998 2013 5 miles with Herring Creek Bacteria NPS 1996 2006 5 Love Creek, Love Creek, Bundicks Branch and 4.2 Nutrients NPS 1996 2003 5 DE280-002 Rehoboth Bay including 5 Goslee Creek to the confluence with miles DO, listed in 1996, Delisted 2002 based on 2002 tributaries Rehoboth Bay DO 1996 1 2002 305(b) report PS, Near coastal waters extending north from 12.0 DO 1996 1998 4a 2004 NPS DE280-E01 Rehoboth Bay Rehoboth Bay 4a the confluence with Indian River Bay at sq. PS, Burton Island mi. Nutrients 1996 1998 4a 2004 NPS 33.0 DE280-L01 Rehoboth Bay Burton Pond 5 Pond northeast of Millsboro Nutrients NPS 1998 2003 5 acres Saline tidal waters extending from the Bacteria NPS 1996 2006 5 4.9 DE140-001 Indian River White Creek 5 north end of Assawoman Canal to the Nutrients NPS 1996 2003 5 miles Indian River Bay DO NPS 1996 2003 5 Bacteria NPS 1996 2006 5 Saline tidal waters from the headwaters 7.2 DE140-002 Indian River Blackwater Creek 5 DO NPS 2002 2003 5 to the confluence with Indian River Bay miles Nutrients NPS 2002 2003 5 Pepper Creek, Pepper Creek including Vines Creek, Bacteria NPS 1996 2006 5 24.8 DE140-003 Indian River including 5 McCrays Branch, and Deep Hole Nutrients NPS 1996 2003 5 miles tributaries Branch DO NPS 1996 2003 5 PS, Bacteria 1996 2006 5 NPS PS, Nutrients 1996 1998 4a 2004 NPS Saline tidal portion of river from 4.6 PS, DE140-004 Indian River Indian River 5 Temperature 1996 1998 2004 4a 2004 Millsboro Pond to Power Plant intake miles NPS EPA TMDL December 2004 PS, SS 1996 1998 4a 2004 NPS PS, DO 2002 1998 4a 2004 NPS
Table III-6: Delaware 2004 Final 303(d) list 144 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes PS, Bacteria 1996 2006 5 NPS Freshwater tidal river from the 8.6 PS, DE140-005 Indian River Swan Creek 5 headwaters of Swan Creek to the Nutrients 1996 2003 5 miles NPS confluence with Indian River Temperature, listed in 1996, delisted in 2002 as sole Temperature point source discharger was removed PS, Bacteria 1996 2006 5 NPS From the confluence of Alms House 8.23 PS, DE140-006 Indian River Stockley Branch 5 Ditch with Stockley Branch to the Nutrients 1996 2003 5 miles NPS confluence with Millsboro Pond PS, DO, listed in 2002, Delisted 2004 based on 2004 DO 2002 1 2004 NPS 305(b) Assessment PS, From the headwaters of McGee Ditch, Bacteria 1996 2006 5 13.6 NPS DE140-007 Indian River Eli Walls Tax Ditch 5 Eli Walls Tax Ditch, and Gills Branch to miles PS, the confluence with Morris Millpond Nutrients 1996 2003 5 NPS PS, Bacteria 1996 2006 5 Deep Branch, including Peterkins NPS Deep Branch, Branch, White Oak Swamp Ditch, 16.9 PS, DE140-008 Indian River 5 Nutrients 1996 2003 5 including tributary Sockorockets Ditch, Welsh Branch, and miles NPS Simpler Branch PS, DO 1996 2003 5 NPS Mirey Branch, including Sheep Pen 23.5 Bacteria NPS 1996 2006 5 Mirey Branch, Ditch, and Narrow Drain miles Nutrients NPS 2004 2003 5 DE140-009 Indian River including 5 Mirey Branch-- from the confluence of 5.40 tributaries the headwaters to the confluence with Habitat NPS 1998 2013 5 miles Sheep Pen Ditch From the headwaters of the tributaries of Bacteria NPS 1996 2006 5 17.5 DE140-010 Indian River Betts Pond Branch 5 Ingrams Pond and Betts Pond to the DO NPS 2002 2003 5 miles confluence with Millsboro Pond, Nutrients NPS 2002 2003 5 PS, Bacteria 1996 2006 5 NPS 13.0 Lower Indian River PS, DE140-E01 Indian River 5 From inlet to Pepper Creek sq. Nutrients 1996 1998 4a 2004 Bay NPS mi. PS, DO 1996 1998 4a 2004 NPS Bacteria NPS 1996 2006 5 Upper portion of estuary from power 0.95 Upper Indian River Nutrients NPS 1996 1998 4a 2004 DE140-E02 Indian River 5 plant cooling water intake to Pepper sq. Bay Temperature NPS 1996 1998 2004 4a 2004 EPA TMDL December 2004 Creek, including Island Creek mi. DO NPS 2002 1998 4a 2004 PS, Bacteria 1996 2003 5 NPS PS, 126.0 Nutrients 1996 2003 5 DE140-L01 Indian River Millsboro Pond 5 Pond north of Millsboro NPS acres 1996 , DO 2003 5 DO, listed in 1996, Delisted 2002 based on 2002 2004 305(b) report, relisted 2004 based on assessment
Table III-6: Delaware 2004 Final 303(d) list 145 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Nutrients NPS 1996 2003 5 80.0 DE140-L02 Indian River Betts Pond 5 Pond northwest of Millsboro Bacteria, listed in 1996, Delisted 2004 based on 2004 acres Bacteria NPS 1996 1 2004 305(b) assessment 48.0 Bacteria NPS 1996 2003 5 DE140-L03 Indian River Ingrams Pond Pond west of Millsboro acres Nutrients NPS 1996 2003 5 Pond between Millsboro and 44.0 PS, DE140-L04 Indian River Morris Mill Pond 5 Bacteria 1996 2006 5 Georgetown acres NPS From the headwaters of Iron Branch and Bacteria NPS 1996 2006 5 13.1 Whartons Branch to the confluence with Nutrients NPS 1996 2003 5 miles Indian River DO NPS 1996 2003 5 DE150-001 Iron Branch Iron Branch 5 Whartons Ditch--from the start of the Habitat NPS 1998 2013 5 3.55 third order stream to the confluence with DO NPS 1998 2013 5 miles Whartons Branch Temperature NPS 1998 2013 5 PS, Delaware DNREC, EPA and MD Dept. of Nutrients 1996 2003 4b NPS Environment are working cooperatively to implement From the headwaters to the MD-DE State 4.6 PS, the MD TMDL for the downstream portion in DE070-001 Buntings Branch Buntings Branch 5 DO 1996 2003 4b line miles NPS Delaware's portion of this shared waterbody for these PS, Bacteria 2002 2006 5 NPS 0.59 Portion of the estuary up to the MD-DE DE350-E01 Assawoman Bay Assawoman Bay 5 sq. Bacteria NPS 1998 2006 5 State line mi. Saline tidal waters from the confluence Bacteria NPS 1996 2006 5 Little Assawoman 3.1 DE180-001 Little Assawoman Bay 5 with White Creek to the confluence with Nutrients NPS 1996 2003 5 Canal miles little Assawoman Bay DO NPS 1996 2003 5 From the headwaters of Miller Creek to Bacteria NPS 1996 2006 5 6.5 the confluence with Little Assawoman DO NPS 1996 2003 5 miles bay Nutrients NPS 1996 2003 5 DE180-002 Little Assawoman Bay Miller Creek 5 Beaver Dam Ditch--from the confluence 2.31 of Blackwater Creek to the confluence Habitat NPS 1998 2013 5 miles with the next larger stream order From the headwaters of Dirickson Creek Bacteria NPS 1996 2006 5 13.3 to the confluence with Little Assawoman Nutrients NPS 1996 2003 5 miles bay DO NPS 2002 2003 5 Bearhole Ditch--from the confluence. of 2.39 DE180-003 Little Assawoman Bay Dirickson Creek 5 the headwaters to the confluence with Habitat NPS 1998 2013 5 miles Batson Branch Agricultural Ditch--from the confluence 2.97 of the headwaters to the confluence with Habitat NPS 1998 2013 5 miles Dirickson Creek Estuary from the confluence with 3.0 Bacteria NPS 1996 2006 5 Little Assawoman DE180-E01 Little Assawoman Bay 5 Assawoman Canal to the confluence sq. DO NPS 1996 2003 5 Bay with Assawoman Bay mi. Nutrients NPS 1996 2003 5
Table III-6: Delaware 2004 Final 303(d) list 146 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes DELAWARE BAY BASIN PS, Bacteria 1996 2006 5 NPS PCBs 1996 2005 5 Arsenic 2002 2011 5 PS, Dioxin 2002 2011 5 NPS, Mercury 2002 2011 5 SF Chlorinated 2002 2011 5 Pesticides The protocol for gathering chronic toxicity data and 59.0 Chronic From the Pennsylvania- Delaware line to related information has been questioned. There is a NA Delaware River DRBC Zone 5 5 sq. Toxicity PS, Liston Point, Delaware. need to collect supplementary data in order to (DRBC Zones NPS, 2002 3 mi. determine the validity of the data used for this listing 5a and 5b, 25 SF and the extent of impairment which may exist in the sq miles) river segment. Surface water levels of iron in the segment sometimes exceed the applicable criterion. The Department believes further study of surface water Iron 2004 3 iron levels and a determination of whether a use impairment is resulting from those levels is an appropriate response to the available information. Nutrients 1996 2006 5 Segment from Route 13 to mouth at 3.0 DO 1996 2006 5 Delaware River tidal freshwater segment miles Bacteria 2002 2006 5 DE020-001 Army Creek Lower Army Creek 5 First tributary on Army Creek after the 0.73 Habitat NPS 1998 2011 5 headwaters miles Segment from Route 13 to the mouth of 2.00 Biology and NPS 1998 2011 5 the Delaware River miles Habitat Nutrients NPS 1998 2006 5 Nontidal segment from headwaters to 1.1 DE020-002 Army Creek Upper Army Creek 5 DO NPS 1998 2006 5 Route 13 miles Bacteria NPS 2002 2006 5 DO NPS 1996 2006 5 Nutrients NPS 1996 2006 5 Chlorinated Chlorinated Benzene, listed in 1996, Delisted 2002 From U.S. Route 13 to the mouth at 1.5 1996 1 2002 Benzenes based on improved conditions. Delaware River miles Bacteria NPS 2002 2006 5 DE270-001-01 Red Lion Creek Lower Red Lion 5 PCBs NPS 2002 2011 5 Dioxins NPS 2002 2011 5 First tributary downstream of Doll Run 0.91 from the headwaters to the confluence Biology NPS 1998 2011 5 miles with Red Lion Creek From the headwaters to the location 1.9 Bacteria NPS 1996 2006 5 where Route 13 intersects Red Lion miles Nutrients NPS 1996 2006 5 DE270-001-02 Red Lion Creek Upper Red Lion 5 First tributary after the headwaters of 0.28 Biology NPS 1998 2011 5 Red Lion Creek miles Nutrients NPS 1998 2006 5 Lower Dragon Run From dam at the water supply pond to 3.2 DE130-001 Dragon Run Creek 5 DO NPS 1998 2006 5 Creek the mouth of Delaware River miles Bacteria NPS 2002 2006 5
Table III-6: Delaware 2004 Final 303(d) list 147 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS 1996 2006 5 4.1 From headwaters to water supply pond DO NPS 1996 2006 5 Upper Dragon Run miles DE130-002 Dragon Run Creek Nutrients NPS 1996 2006 5 Creek From the confluence of the headwaters to 3.42 Biology NPS 1998 2011 5 the water supply dam miles Nutrients NPS 2002 2011 5 Chesapeake & Delaware C&D Canal from the MD Line to 15.0 DE090-001 C&D Canal 5 PCBs NPS 2002 2011 5 Canal Delaware River M Dioxins NPS 2002 2011 5 Scott Run-- from the headwaters to the Biology and 4.81 NPS 1998 2011 5 confluence with Chesapeake & Delaware Habitat miles Canal DO NPS 1998 2006 5 Crystal Run--from the headwaters to the 1.52 confluence with Chesapeake & Delaware Biology NPS 1998 2011 5 Tributaries of miles Chesapeake & Delaware Canal DE090-002 Chesapeake & 5 Canal Joy Run--from the headwaters to the Delaware Canal 1.99 confluence with Chesapeake & Delaware Biology NPS 1998 2011 5 miles Canal Eastern tributary on Lums Pond--from 1.04 Biology and the headwaters to the confluence with NPS 1998 2011 5 miles Habitat Lums Pond Bacteria, listed in 1996, Delisted 2004 based on Chesapeake & Delaware 189.3 Bacteria NPS 1996 1 2004 DE090-L01 Lums Pond5 Pond south of Newark 305(b) assessment Canal acres Nutrients NPS 2002 2006 5 PS, DO 1996 1998 4a 2004 NPS Lower PS, Saline Tidal Reach, excluding 7.1 Nutrients 1996 1998 4a 2004 DE010-001-01 Appoquinimink River Appoquinimink 5 NPS Hangman’s Run miles River Bacteria NPS 2002 2006 5 PCBs NPS 2002 2011 5 Dioxins NPS 2002 2011 5 PS, Nutrients 1996 1998 4a 2004 NPS PS, Upper DO 1996 1998 4a 2004 6.1 NPS DE010-001-02 Appoquinimink River Appoquinimink 5 Freshwater Tidal Reach miles PS, River Bacteria 2002 2006 5 NPS PCBs NPS 2002 2011 5 Dioxins NPS 2002 2011 5 From the headwaters of Drawyer Creek Bacteria NPS 1996 2006 5 8.2 to the confluence with the Nutrients NPS 1996 2003 4a 2004 miles Appoquinimink River, including DO NPS 1996 2003 4a 2004 Tributary of Drawyer Creek--from the 2.30 Biology and confluence of the headwaters to the NPS 1998 2011 5 DE010-001-03 Appoquinimink River Drawyer Creek 5 miles Habitat confluence with the mainstem Western tributary of the headwaters of 2.20 Habitat NPS 1998 2011 5 Drawyer Creek to its confluence miles 5.45 PCBs NPS 2002 2011 5 Tidal Portion miles DDT NPS 2002 2011 5
Table III-6: Delaware 2004 Final 303(d) list 148 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes From the headwaters of Wiggins Mill Bacteria NPS 1996 2006 5 3.4 Pond to the confluence with Noxontown DO NPS 1996 2003 4a 2004 miles Wiggins Mill Pond Pond Nutrients NPS 2002 2003 4a 2004 DE010-002-01 Appoquinimink River to confluence with 5 From the confluence of the headwaters of Silver Lake 1.62 Wiggins Mill Pond to the confluence Biology NPS 1998 2011 5 miles with Noxontown Pond Bacteria NPS 2002 2006 5 From the headwaters of Deep Creek to 2.4 Nutrients NPS 2002 2003 4a 2004 confluence with Silver Lake, excluding miles DO, listed in 1996, Delisted 2002 based on 2002 Silver Lake DO 1996 1 2002 Deep Creek to 305(b) report DE010-002-02 Appoquinimink River confluence with 5 First western tributary after the 1.98 Biology NPS 1998 2011 5 Silver Lake headwaters of Silver Lake miles Deep Creek.-- from the confluence of the 1.84 Biology NPS 1998 2011 5 headwaters to Appoquinimink River miles 158.6 Bacteria NPS 1998 2006 5 DE010-L01 Appoquinimink River Noxontown Pond Pond southwest of Odessa acres Nutrients NPS 1998 2003 4a 2004 Bacteria NPS 1996 2006 5 Nutrients NPS 1996 2001 5 Lake adjacent to Middletown, below 38.7 PCB NPS 2002 2011 5 DE010-L02 Appoquinimink River Silver Lake 5 Deep Creek acres Dieldrin NPS 2002 2011 5 DDT NPS 2002 2011 5 Dioxin NPS 2002 2011 5 Nutrients NPS 1996 2001 2003 4a 2004 43.1 DE010-L03 Appoquinimink River Shallcross Lake 4a Lake above Drawyer Creek Bacteria, listed in 1996, Delisted 2004 based on acres Bacteria NPS 1996 1 2004 305(b) assessment DO NPS 1996 2006 5 Tidal segment from Route 13 to mouth 13.8 DE030-001 Blackbird Creek Lower Blackbird 5 Nutrients NPS 1996 2006 5 of the Delaware River miles Bacteria NPS 2002 2006 5 Bacteria NPS 1996 2006 5 Nontidal segment from headwaters to 13.6 DO NPS 1996 2006 5 Route 13 miles Nutrients NPS 1996 2006 5 First eastern tributary after the 2.19 headwaters to the confluence with Biology NPS 1998 2011 5 miles Blackbird Creek DE030-002 Blackbird Creek Upper Blackbird 5 Upper Blackbird Creek--from the 2.11 confluence of the headwaters to the Biology NPS 1998 2011 5 miles confluence with Barlow Branch From the confluence of the headwaters to 2.27 Biology NPS 1998 2011 5 the confluence with Barlow Branch miles DO NPS 2004 2006 5 Tributaries on the Sandom Branch to the confluence with 1.16 Biology and DE030-003 Blackbird Creek 5 NPS 1998 2011 5 mainstem Blackbird Creek ( upper half ) miles Habitat Habitat NPS 1998 2011 5
Table III-6: Delaware 2004 Final 303(d) list 149 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes DO NPS 1996 2006 5 Lower Smyrna From the head of tide to the Delaware 10.2 DE310-001 Smyrna River 5 Nutrients NPS 1996 2006 5 River River miles Bacteria NPS 2002 2006 5 Bacteria NPS 1996 2006 5 5.2 From the headwaters to Lake Como Nutrients NPS 1996 2006 5 miles DO NPS 2002 2006 5 DE310-002 Smyrna River Mill Creek 5 Providence Creek--from the confluence 2.18 Biology and of the headwaters of Mill Creek to the NPS 1998 2011 5 miles Habitat confluence with Lake Como Bacteria NPS 1998 2006 5 Tributaries from the headwaters to the 4.2 DO NPS 2004 2006 5 confluence with Delaware Bay miles Nutrients NPS 1998 2006 5 From the confluence of the headwaters of 2.68 Biology and Paw Paw Branch to the confluence with NPS 1998 2011 5 miles Habitat Providence Creek Tributary of First eastern tributary after the DE310-003 Smyrna River 5 0.86 Smyrna River headwaters of Paw Paw Branch to the Habitat NPS 1998 2011 5 miles confluence with Smyrna River Eastern tributary of the headwaters of 0.67 Biology and NPS 1998 2011 5 Sawmill Branch to its confluence miles Habitat Sawmill Branch--from the confluence of 3.81 the headwaters to the next larger stream Biology NPS 1998 2011 5 miles order Lake Como and 82.0 Bacteria NPS 1996 2006 5 DE310-L01 Smyrna River 5 Lake Como in Smyrna Duck Creek Pond acres Nutrients NPS 1996 2006 5 Bacteria NPS 1996 2006 5 Lower Leipsic From dam at Garrisons Lake to mouth at 13.6 DE160-001 Leipsic River 5 Nutrients NPS 1996 2006 5 River Delaware River miles DO NPS 1996 2006 5 Bacteria NPS 1996 2006 5 From headwaters to Garrisons Lake, 5.8 DO NPS 1996 2006 5 excluding Masseys Mill Pond miles Nutrients NPS 1996 2006 5 Upper Leipsic From the start of the third order stream 2.70 Biology NPS 1998 2011 5 DE160-002 Leipsic River 5 River on Pinks Branch to the confluence with miles DO NPS 1998 2006 5 Tributary of Leipsic River--from the 0.93 confluence of the headwaters to the Biology NPS 1998 2011 5 miles confluence with Leipsic River From the confluence of the headwaters of 2.16 Tributary from the Alston Branch to the confluence Leipsic Biology NPS 1998 2011 5 miles dam at Garrisons River 5 Lake to mouth at Tributary of Leipsic River--eastern DE160-003 Leipsic River 0.91 Delaware Bay tributary of the headwaters to its Habitat NPS 1998 2011 5 miles confluence Dyke Branch from headwaters to 4.39 Dyke Branch 5 DO NPS 2004 2006 5 confluence with Leipsic River miles Muddy Branch from headwaters to the 5.59 DE160-004 Leipsic River Muddy Branch 5 DO NPS 2004 2006 5 confluence with Leipsic River miles
Table III-6: Delaware 2004 Final 303(d) list 150 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS 1996 2006 5 85.9 DE160-L01 Leipsic River Garrisons Lake5 Lake south of Smyrna Nutrients NPS 1996 2006 5 acres DO NPS 2002 2006 5 Bacteria NPS 1996 2006 5 30.0 DE160-L02 Leipsic River Masseys Mill Pond 5 Pond south of Clayton DO NPS 1996 2006 5 acres Nutrients NPS 1996 2006 5 From the confluence of Upper Little DO NPS 1996 2006 5 2.9 DE190-001-01 Little River Lower Little River 5 River and Pipe Elm Branch with the Nutrients NPS 1996 2006 5 miles Lower Little River to the mouth at Bacteria NPS 2002 2006 5 Bacteria NPS 1996 2006 5 From the headwaters to the confluence 5.5 DO NPS 1996 2006 5 with Lower Little River miles Nutrients NPS 1996 2006 5 Morgan Branch--from the confluence of 0.60 DE190-001-02 Little River Upper Little River 5 the headwaters to the confluence with the Habitat NPS 1998 2011 5 miles next larger stream order Start of the third order stream near the 4.14 Biology and headwaters of Little River to the NPS 1998 2011 5 miles Habitat confluence with Morgan Branch Bacteria NPS 1996 2006 5 From the headwaters to the confluence 2.1 DE190-001-03 Little River Pipe Elm Branch 5 DO NPS 1996 2006 5 with Little River miles Nutrients NPS 1996 2006 5 DO NPS 1996 2006 5 PCBs NPS 1996 2011 5 Nutrients NPS 1996 2006 5 From Old Lebanon Bridge to the mouth 8.3 DE290-001-01 Saint Jones River Lower Saint Jones 5 Bacteria NPS 2002 2006 5 of Delaware Bay miles Dioxin NPS 2002 2011 5 Mercury NPS 2002 2011 5 Arsenic NPS 2002 2011 5 Bacteria NPS 1996 2006 5 DO NPS 1996 2006 5 PCBs NPS 1996 2011 5 From the dam at Silver Lake to Old 6.7 Nutrients NPS 1996 2006 5 Lebanon Bridge at Road 357 miles Dioxin NPS 2002 2011 5 Mercury NPS 2002 2011 5 DE290-001-02 Saint Jones River Upper Saint Jones 5 Arsenic NPS 2002 2011 5 0.32 Tributary of Silver Lake in Dover Habitat NPS 1998 2011 5 miles Puncheon Branch--from the confluence 1.84 Biology and of the headwaters to the confluence with NPS 1998 2011 5 miles Habitat the Saint Jones River
Table III-6: Delaware 2004 Final 303(d) list 151 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS 1996 2006 5 From the headwaters to the confluence 9.1 Nutrients NPS 1996 2006 5 with Saint Jones River, excluding miles DO, listed in 1996, Delisted 2002 based on 2002 Moores Lake DO 1996 1 2002 305(b) report From the confluence of Allabands Mill 3.62 Stream to the confluence with Saint Biology NPS 1998 2011 5 miles Jones River DE290-002 Saint Jones River Isaac Branch From the confluence of the headwaters of 2.50 Almhouse Branch to the confluence of Biology NPS 1998 2011 5 miles Isaac Branch Second tributary upstream of Wyoming 1.28 Habitat NPS 1998 2011 5 Lake on Isaac Branch miles PCB NPS 2002 2011 5 28.5 Wyoming Mill Pond Dioxin NPS 2002 2011 5 Acres DDT NPS 2002 2011 5 Bacteria NPS 1996 2006 5 From the headwaters to Silver Lake in 7.7 DO NPS 1996 2006 5 Dover miles Nutrients NPS 1996 2006 5 Cahoon Branch--from the confluence of 2.33 the headwaters to the confluence with the Habitat NPS 1998 2011 5 miles next larger stream order Maidstone Branch- from the confluence 3.09 of the third order stream to the Biology NPS 1998 2011 5 miles confluence with Cahoon Branch DE290-003 Saint Jones River Fork Branch 5 Tributary to Maidstone Branch---from 0.13 the confluence of the headwaters to the Habitat NPS 1998 2011 5 miles confluence with Maidstone Branch Fork Branch--from the start of the third 6.24 Habitat NPS 1998 2011 5 order stream to the confluence with miles DO NPS 1998 2011 5 From the start of the third order stream 1.28 on Cahoon Branch to the confluence with Biology NPS 1998 2011 5 miles Maidstone Branch
Table III-6: Delaware 2004 Final 303(d) list 152 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes Bacteria NPS 1996 2006 5 From below Derby Pond to the 3.8 Nutrients NPS 1996 2006 5 confluence with the Saint Jones River miles DO 2002 2006 5 From the confluence of the headwaters of 1.08 Biology and Tidbury Creek to the confluence with NPS 1998 2011 5 miles Habitat Derby Pond Tributary of Tidbury Creek--from the 0.75 DE290-004 Saint Jones River Tidbury Branch 5 headwaters to the confluence with Habitat NPS 1998 2011 5 miles Tidbury Creek Red House Branch--from the confluence 0.71 of the headwaters to the confluence with Biology NPS 1998 2011 5 miles Derby Pond Tidbury Creek--from the confluence with 4.53 Derby Pond to the confluence with Biology NPS 1998 2011 5 miles Lower Saint Jones River Bacteria NPS 1996 2006 5 PCBs NPS 1996 2011 5 27.1 Nutrients NPS 1996 2006 5 DE290-L01 Saint Jones River Moores Lake5 Lake east of Camden acres DO, listed in 1996, Delisted 2002 based on 2002 DO NPS 1996 2006 1 2002 305(b) report DDT NPS 2002 2011 5 Bacteria NPS 1996 2006 5 Nutrients NPS 1996 2006 5 157.8 DE290-L02 Saint Jones River Silver Lake 5 Silver Lake at Dover PCBs NPS 1996 2011 5 acres Dioxin NPS 2002 2011 5 Mercury NPS 2002 2011 5 Bacteria, listed in 1996, Delisted 2004 based on 23.1 Bacteria NPS 1996 1 2004 DE290-L03 Saint Jones River Derby Pond 5 Pond south of Wyoming 305(b) assessment acres Nutrients NPS 1996 2006 5 PS, Nutrients 1996 2006 2001 4a 2004 NPS From the confluence with Spring Creek 7.6 PS, DE220-001 Murderkill River Lower Murderkill 5 DO 1996 2006 2001 4a 2004 to the mouth at Delaware Bay miles NPS PS, Bacteria 2002 2006 5 NPS PS, Bacteria 1996 2006 5 NPS From the headwaters to the confluence 15.8 PS, with Murderkill River , excluding DO 1996 2001 4a 2004 miles NPS Andrews Lake and McGinnis Pond PS, Nutrients 1996 2001 4a 2004 DE220-002 Murderkill River Spring Creek 5 NPS Tributary of Hudson River--from the 0.49 Biology and headwaters to the confluence with the NPS 1998 2011 5 miles Habitat next larger stream order Pratt Branch--eastern tributary of the 1.27 Biology NPS 1998 2011 5 headwaters to its confluence miles
Table III-6: Delaware 2004 Final 303(d) list 153 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes PS, Bacteria 1996 2006 5 From McCauley and Coursey Pond to the 9.2 NPS confluence with Spring Creek miles PS, Mid Murderkill Nutrients 1996 2001 4a 2004 DE220-003Murderkill River 5 NPS River Ash Gut-- from the headwaters to the 1.04 Biology and confluence with the next larger stream NPS 1998 2011 5 miles Habitat order Bacteria NPS 1998 2006 5 From the headwaters adjacent to DO NPS 1998 2001 4a 2004 8.8 Harrington to the confluence with Nutrients NPS 1998 2001 4a 2004 miles McCauley Pond PS, DE220-004 Murderkill River Browns Branch 5 Ammonia 2004 2001 4a 2004 NPS Tributary of Browns Branch-- from the confuence of the headwaters wtot he 1.77 Biology and NPS 1998 2011 5 confluence with Browns Branch miles Habitat From the headwaters to the confluence Bacteria NPS 1996 2006 5 7.4 with Coursey pond, excluding Killens DO NPS 2004 2001 4a 2004 miles and Coursey Ponds Nutrients NPS 1996 2001 4a 2004 Spring Branch--tributary on Coursey 2.52 Biology NPS 1998 2011 5 Pond miles Habitat NPS 1998 2011 5 Fan Branch--from the headwaters to the 2.31 DO NPS 1998 2011 5 confluence with Murderkill River miles Temperature NPS 1998 2011 5 Upper Murderkill DE220-005 Murderkill River 5 Tributary of Black Swamp Creek--from 0.28 River Habitat NPS 1998 2011 5 the headwaters to its confluence miles Beaver Dam Branch--from the confluence of the headwaters to the 2.96 Biology NPS 1998 2011 5 confluence with Murderkill River and miles Black Swamp Creek Black Swamp Creek--from the Biology and 0.75 NPS 1998 2011 5 headwaters of Black Swamp to the Habitat miles confluence with the next larger stream DO NPS 1998 2011 5 Bacteria NPS 1998 2006 5 31.3 DE220-L01 Murderkill River McGinnis Pond 5 Pond east of Viola Nutrients NPS 1998 2001 4a 2004 acres DO NPS 2002 2001 4a 2004 17.5a Bacteria NPS 2002 2006 5 DE220-L02 Murderkill River Andrews Lake 5 Pond West of Frederica cres Nutrients NPS 2002 2001 4a 2004 Nutrients NPS 1996 2001 4a 2004 58.1 DE220-L03 Murderkill River Coursey Pond4a Pond southwest of Frederica Bacteria, listed in 2002, Delisted 2004 based on acres Bacteria NPS 2002 1 2004 305(b) assessment
Table III-6: Delaware 2004 Final 303(d) list 154 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes 75.1 Bacteria NPS 1996 2006 5 DE220-L04 Murderkill River Killens Pond 5 Pond southwest of Felton acres Nutrients NPS 1996 2001 4a 2004 Bacteria, listed in 1996, Delisted 2004 based on 49.0 Bacteria NPS 1996 1 2004 DE220-L05 Murderkill River McCauley Pond4a Pond northeast of Harrington 305(b) assessment acres Nutrients NPS 1996 2001 4a 2004 Bacteria NPS 1996 2006 5 From dam at Silver Lake to mouth at 13.2 DE210-001 Mispillion River Lower Mispillion 5 DO NPS 1996 2006 5 Delaware Bay miles Nutrients NPS 1996 2006 5 From the headwaters to Silver Lake in Bacteria NPS 1996 2006 5 11.2 Milford, excluding Silver, Haven, and DO NPS 1996 2006 5 miles Griffith Lakes; Blairs, Abbotts, and Tub Nutrients NPS 1996 2006 5 DE210-002 Mispillion River Upper Mispillion 5 Tantrough Branch--from the headwaters 3.24 Biology NPS 1998 2011 5 to the confluence with Blairs Pond miles Beaverdam Branch--western tributary of 2.69 Biology NPS 1998 2011 5 the headwaters to its confluence miles Johnson Branch Johnson Branch--from the confluence of 4.02 DE210-003 Mispillion River including its 4c the headwaters to the confluence with Habitat NPS 1998 2011 5 miles tributaries Haven Lake Tributary from the Lednum Branch---eastern tributary of the 1.31 DE210-004 Mispillion River headwaters to 4c Habitat NPS 1998 2011 5 headwaters to its confluence miles Silver Lake Mispillion Tributaries From 2.45 DE210-005 Mispillion River 5 King's Causeway Branch DO NPS 2004 2006 5 Dam At Silver Lake miles To The Mouth 4.8 DE210-L01 Mispillion River Tub Mill Pond 5 Pond north of Milford Nutrients NPS 1996 2006 5 acres 28.5 Bacteria NPS 1996 2006 5 DE210-L02 Mispillion River Silver Lake 5 Silver Lake at Milford acres Nutrients NPS 1996 2006 5 Nutrients NPS 1996 2006 5 Lake west of Milford; upstream of Silver 82.5 DO NPS 1996 2006 5 DE210-L03 Mispillion River Haven Lake 5 Lake acres Bacteria, listed in 2002, Delisted 2004 based on Bacteria NPS 2002 1 2004 305(b) assessment Lake west of Milford; upstream of Haven 32.2 DE210-L04 Mispillion River Griffith Lake 5 Nutrients NPS 1996 2006 5 Lake acres Bacteria NPS 1996 2006 5 28.5 Nutrients NPS 1996 2006 5 DE210-L05 Mispillion River Blairs Pond 5 Pond southwest of Milford acres DO, listed in 1996, Delisted 2002 based on 2002 DO 1996 1 2002 305(b) report Bacteria NPS 1998 2006 5 25.6 DE210-L06 Mispillion River Abbotts Mill Pond 5 Pond southwest of Milford Nutrients NPS 1998 2006 5 acres DO NPS 2002 2006 5 DO NPS 1996 2006 5 Lower Cedar Tidal segment from Cedar Creek Mill 8.8 DE080-001 Cedar Creek 5 Bacteria NPS 1996 2006 5 Creek Pond to mouth at Delaware Bay miles Nutrients NPS 1996 2006 5
Table III-6: Delaware 2004 Final 303(d) list 155 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes From the headwaters to Cedar Creek Mill Bacteria NPS 1996 2006 5 13.0 DE080-002 Cedar Creek Upper Cedar Creek 5 Pond, including Church Branch and Nutrients NPS 1996 2006 5 miles Cedar Mill Pond, Cubbage Pond, DO NPS 2004 2006 5 From the headwaters to The Confluence 7.91 DE080-003 Cedar Creek Slaughter Creek 5 DO NPS 2004 2006 5 with Cedar Creek Miles From the confluence with Beaver Dam Nutrients NPS 1996 2006 5 8.1 DE060-001 Broadkill River Lower Broadkill 5 Creek to mouth at Delaware Bay, DO NPS 1996 2006 5 miles excluding Red Mill Pond Bacteria NPS 2002 2006 5 PS, Bacteria 1996 2006 5 NPS From the headwaters to the confluence 8.3 PS, DE060-002 Broadkill River Beaverdam Creek 5 Nutrients 1996 2006 5 with Broadkill River miles NPS PS, DO 2002 2006 5 NPS PS, Bacteria, listed in 1998, Delisted 2004 based on Broadkill River from below Waggamons Bacteria 1998 1 2004 Upper Broadkill 5.0 NPS 305(b) assessment DE060-003 Broadkill River 5 Pond to the confluence with Beaver Dam River miles PS, Creek Nutrients 1998 2006 5 NPS Bacteria NPS 1996 2006 5 Tributary from the headwaters to 5.2 DE060-004 Broadkill River Round Pole Branch 5 DO NPS 1996 2006 5 confluence with Upper Broadkill River miles Nutrients NPS 1996 2006 5 Bacteria NPS 1996 2006 5 From the headwaters to Waggamons 7.6 DO NPS 1996 2006 5 Pond, including Diamond Pond miles DE060-005 Broadkill River Ingrams Branch 5 Nutrients NPS 1996 2006 5 Ingrams Branch-- western tributary of 1.70 DO NPS 1998 2006 5 the headwaters miles Habitat NPS 1998 2012 5 From the headwaters to Waggamons 5.0 Bacteria NPS 1996 2006 5 DE060-006 Broadkill River Pemberton Branch 5 Pond miles Nutrients NPS 1996 2006 5 Nutrients NPS 1996 2006 5 DO, listed in 1996, Delisted 2002 based on 2002 Lower Red Mill From Red Mill Pond to the confluence 5.3 DO 1996 1 2002 DE060-007-01 Broadkill River 5 305(b) report Branch with Lower Broadkill River miles Bacteria, listed in 2002, Delisted 2004 based on Bacteria NPS 2002 1 2004 305(b) assessment 1.5 DO NPS 1996 2006 5 From the headwaters to Red Mill Pond miles Nutrients NPS 1996 2006 5 DE060-007-02 Broadkill River Martin Branch 5 Tributary above Red Mill Pond--from 0.06 start of the second order stream to the Habitat NPS 1998 2011 5 miles confluence with Red Mill Pond 1.0 Bacteria NPS 1996 2006 5 DE060-007-03 Broadkill River Heronwood Branch 5 From the headwaters to Red Mill Pond miles DO NPS 1996 2006 5 Bacteria NPS 1996 2006 5 150.0 DE060-L01 Broadkill River Red Mill Pond 5 Pond located on Martin Branch Nutrients NPS 1996 2006 5 acres DO NPS 1996 2006 5 35.0 PS, DE060-L02 Broadkill River Waggamons Pond 5 Pond adjacent to Milton Nutrients 1996 2006 5 acres NPS Bacteria NPS 1998 2006 5 Waples Pond and Ponds located on Sowbridge Branch of 88.8 DE060-L03 Broadkill River 5 Nutrients NPS 1998 2006 5 Reynolds Pond Primehook Creek acres DO NPS 1998 2006 5
Table III-6: Delaware 2004 Final 303(d) list 156 POLLUTANT URCE(S) WATERBODY WATERSHED NAME SEGMENT DESCRIPTION SIZE OR ID STRESSOR TMDL Methodology TMDL DATE TMDL Assessment and YEAR LISTED YEAR Year Changed from from Changed Year Overall CALM Code CALM Overall Category 5 Per 305(b) 305(b) 5 Per Category TARGET DATE FOR Polllutant CALM Code
PROBABLE SO Notes DELAWARE ESTUARY BASIN PS, Bacteria 1996 2006 5 782.0 NPS From Liston Point to the confluence N/A Delaware Bay DRBC Zone 6 5 sq. PCBsPS, 1996 2005 5 with the Atlantic Ocean mi. Mercury NPS, 2002 2012 5 Dioxin SF 2002 2012 5
KEY for Pollutant(s) or Stressor(s): DO = Dissolved Oxygen KEY for Probable Source(s): NPS = Nonpoint Source(s) PS = Point Source(s) SF = Superfund Site(s) KEY for CALM Code 1= Fully Supporting for this parameter 3= Information is insufficent to make a determination 4a= TMDL has been completed and approved by EPA 4b= Management Actions are expected to solve impairment 5= TMDL Needed
Table III-6: Delaware 2004 Final 303(d) list 157 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Chapter Four: Public Health/Aquatic Life Concerns
State of Delaware Fish Consumption Advisory Update Certain chemicals build up in the food chain to levels that can be harmful to human and ecological health. DNREC and DHSS collect and analyze fish from Delaware waters to monitor the extent that these chemicals accumulate in fish from Delaware waters. When elevated levels are detected, the information is shared with the public and consumption advisories are issued to notify the angling public, their families, and friends regarding contaminants in fish from affected waterways. The advisories include specific advice on the number of meals to be consumed annually and proper trimming and cooking. The goal of this advice is voluntary reduction of exposure until the contamination is sufficiently cleaned up. The following table lists the current fish consumption advisories (recommended limitations on the consumption of particular fish species) issued jointly by the Delaware Department of Natural Resources and Environmental Control and the Department of Health and Social Services, as of March 2004 (see also Figure III-6).
Delaware Fish Consumption Advisories as of March, 2004
Geographical Contaminants Waterbody Species Advice Extent of Concern*
No more than one Becks Pond All Finfish Entire Pond PCBs, Mercury 8-ounce meal per year
PCBs, Dioxin, Delaware State Mercury, Delaware River All Finfish Line to the No Consumption Chlorinated C&D Canal Pesticides
No more than Red Lion Route 13 to the All Finfish PCBs, Dioxin three 8-ounce Creek Delaware River meals per year
159 Delaware Fish Consumption Advisories as of March, 2004
Geographical Contaminants Waterbody Species Advice Extent of Concern*
No more than one 8-ounce meal per Striped Bass, year; No more Channel Lower than one 8 ounce Catfish, White C&D Canal to Delaware River PCBs, Mercury, meal per year for Catfish, Delaware Bay and Delaware Dieldrin bluefish less than American Eel, Mouth Bay 24 inches. White Perch, Do not eat bluefish Bluefish larger than 24 inches.
Tidal River Mouth to Brandywine All Finfish PCBs No Consumption Baynard Blvd. River
Baynard Blvd. Non-Tidal No more than two To Brandywine All Finfish PCBs, Dioxin 8-ounce meals per Pennsylvania River year Line
Philadelphia Shellpot Creek All Finfish Pike to the PCBs No Consumption Delaware River
Tidal Christina River Mouth to All Finfish PCBs, Dieldrin No Consumption River Smalley’s Dam
No more than six Non-tidal Smalley’s Dam All Finfish PCBs 8-ounce meals per Christina River to I-95 year
Creek mouth to Little Mill All Finfish Kirkwood PCBs No Consumption Creek Highway
160 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Delaware Fish Consumption Advisories as of March, 2004
Geographical Contaminants Waterbody Species Advice Extent of Concern*
Tidal White River Mouth to All Finfish PCBs No Consumption Clay Creek Route 4
Non Tidal No more than one Rte. 4 to Paper White Clay All Finfish PCBs 8-ounce meal per Mill Road Creek month
PCBs, Dioxin, No more than two Red Clay State Line to All Finfish Chlorinated 8-ounce meals per Creek Stanton Pesticides year
Chesapeake & Entire Canal in Delaware All Finfish PCBs No Consumption Delaware Canal
No More than one Appoquinimink All Finfish Tidal Portions PCBs, Dioxin 8-ounce meal per River year
No More than one Drawyers All Finfish Tidal Portions PCBs, DDT 8-ounce meal per Creek year
No More than one Silver Lake PCBs, Dieldrin, All Finfish Entire Lake 8-ounce meal per Middletown DDT, Dioxin year
River Mouth to No More than two St. Jones River All Finfish Silver Lake PCBs, Dioxin 8-ounce meals per Dam year
No More than two Moores Lake All Finfish Entire Pond PCBs, DDT 8-ounce meals per year
161 Delaware Fish Consumption Advisories as of March, 2004
Geographical Contaminants Waterbody Species Advice Extent of Concern*
No More than two Silver Lake PCBs, Dioxin, All Finfish Entire Pond 8-ounce meals per Dover Mercury year
No More than two Wyoming Mill PCBs, Dioxin, All Finfish Entire Pond 8-ounce meals per Pond DDT year
* The pollutant listed first is of the greatest concern in this system. Proper trimming and cooking of fish can reduce, but not eliminate, the risk associated with PCB's, Dioxins, and chlorinated pesticides. Trimming and cooking does not reduce the risk associated with mercury!
The contaminant of primary concern for these advisories is polychlorinated biphenyl (PCB). To a lesser degree chlorinated pesticides, dioxins and mercury have been identified as contaminants of concern. PCBs have been designated as probable human carcinogens by the EPA, are believed to affect the immune system and have been linked to developmental problems in infants. PCBs were banned in the 1970s but are extremely persistent in the environment. PCBs are found in bottom sediments and continue to enter Delaware waters from upland sources, though not at an increasing rate. Data collected to date show that PCBs in fish are not an imminent public health threat, though they are a significant, avoidable exposure. Exposure may be avoided by eating fish from uncontaminated waters. Delaware will continue to monitor the situation and coordinate work between and within agencies to coordinate remediation activities.
National Methylmercury Fish Consumption Advisory On January 12, 2001, EPA and the Food and Drug Administration (FDA) issued concurrent national fish consumption advisories recommending restricted consumption of freshwater coastal and marine species of fish due to methylmercury contamination. EPA’s advisory targeted women of childbearing age and children who may be consuming noncommercial freshwater fish caught by family or friends. The advisory specifically recommends that women who are pregnant or could become pregnant, women who are nursing a baby, and their young children, should limit consumption of freshwater fish caught by family and friends to one meal per week unless the state health department has different advice for the specific waters where the fish are caught. For adults, one meal is six ounces of cooked fish or eight ounces uncooked fish; for a young child, one meal is two ounces of cooked fish or three ounces of uncooked fish. The FDA issued advice on mercury in fish bought from stores and restaurants, which includes ocean and coastal fish as well as other types of commercial fish. The advice was that women
162 State of Delaware 2004 Combined 305(b) Report and 303(d) List
who are pregnant or could become pregnant, nursing mothers, and young children, not eat shark, swordfish, king mackerel, or tilefish. FDA also advises that women who are pregnant or could become pregnant may eat an average of 12 ounces of fish purchased in stores and restaurants each week. EPA recommends that women who are or could become pregnant, nursing mothers, and young children follow the FDA advice for coastal and ocean fish caught by family and friends. EPA and FDA both recommend that the public check with state or local health authorities for specific consumption advice about fish caught or sold in the local area. The EPA and FDA advisories are available through the EPA fish advisory website.
Shellfish and Recreational Waters Program
Shellfish Program Delaware, along with 26 other states, and nine foreign countries, is a member of the Interstate Shellfish Sanitation Conference (ISSC), administrative body of the National Shellfish Sanitation Program (NSSP). The ISSC is a tripartite organization, with the membership including state participants, the U.S. Food and Drug Administration, and the shellfish industry. Member-states / countries establish water quality and pollution source parameters for determining the safety of shellfish for human consumption. Additionally, parameters are established for sanitation in harvesting, processing, and shipping shellfish (molluscan bivalves). DNREC's role is to maintain Delaware's NSSP conforming status, as per FDA scrutiny (annual Program evaluations), thereby allowing Delaware to ship and receive shellfish. This is necessary for the preservation of Delaware's shellfish industry. Additionally, and most importantly, this ensures a safe product for the shellfish consumer.
Recreational Water (beach monitoring) Program DNREC also ensures that natural bathing beaches are safe for swimming. Of particular concern are viruses shed by humans. Delaware uses total enterococci as an indicator of possible human fecal contamination. As is the case with the Shellfish Program, there is a qualitative component in the assessment of the risk to swimmers. Enterococci in the presence of possible sources of human fecal contamination may represent an unacceptable health risk. However, there is an increasing body of evidence, including studies conducted in Delaware, that so-called indicator bacteria are ubiquitous in the environment. Delaware's standards are based on Delaware-specific bacteria and illness data, and reflect a threshold swimming advisory level of 12.5 illnesses per 1,000 swimmers. The actual prevailing risk may be in the range of two in 100,000. Guarded beaches are tested weekly from mid-May to Labor Day.
163 164 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Part IV Ground-Water Assessment
165
State of Delaware 2004 Combined 305(b) Report and 303(d) List
IV.1 Ground-Water Assessment Overview Ground water provides an abundant, high-quality, low-cost supply of water for residents of the State of Delaware. The latest estimates indicate that more than 40 billion gallons of water were withdrawn in 1995 from ground water sources (Solley et al., 1998), a 20% increase from the estimated 1990 ground-water withdrawal of 32 billion gallons (Solley et al., 1993). The domestic needs of approximately two-thirds of the State's population are met with ground water provided by both public and private wells. Most of the water used for agriculture, Delaware's largest industry, and self-supplied industrial use, is also derived from ground-water sources. These figures will be updated during the next reporting cycle once the water-use data for 2000 have been compiled by the U.S. Geological Survey (USGS). By maintaining base flow ground water is recognized as the primary supplier of fresh water to streams. By allowing streams to maintain flow even during times of low rainfall ground water is responsible for supporting aquatic ecosystems, wildlife populations, and water-supply withdrawals. Work by the USGS in the Red Clay Creek Basin estimated that base flow comprises 62-71% of stream flow (Vogel and Reif, 1993). In Atlantic Coastal Plain streams in Delaware, base flow has been shown to constitute approximately 80 percent of surface-water flow (Johnston, 1976). During periods of low or no rainfall, essentially all surface water flow is due to ground-water discharge. Saltwater intrusion and high iron content in ground water are two naturally-occurring contamination problems that may render ground water undrinkable. Radionuclides have been found in certain aquifers in both New Jersey and Maryland and studies in Delaware (Bachman and Ferrari, 1995; Werkheiser, 1995; Ferrari, 2001) indicate that they, particularly radon, are elevated in some areas. The occurrences of these contaminants appear to be localized and most of Delaware's ground water is of high quality. Generally, the development of ground water as a water source is less costly than surface water because it does not require as much, if any, treatment. In addition, production wells can be located near demand centers, which reduces the need for extensive transmission lines. Ground water in Delaware is, however, a relatively vulnerable resource due to the State's shallow water table and high soil permeability. The shallow unconfined aquifer is the most vulnerable to contamination and has been made unusable in many localized areas. If ground water resources are improperly managed or inadequately protected, many of the advantages previously mentioned may be lost. Contaminants in ground water originate from anthropogenic sources such as domestic septic systems, landfills, underground storage tanks, agricultural activities, chemical spills and leaks, and many other sources and activities. As population and industrialization of the State continues the standards of purity of ground water are more frequently exceeded over larger areas of the State. The deeper confined aquifers in the State are also susceptible to contamination. This is because all but one of the confined aquifers in Delaware subcrops beneath the unconfined aquifer and all aquifers receive recharge from leakage from overlying aquifers. Consequently, contamination of the ground water in the surficial unconfined aquifer could eventually affect ground-water quality of the underlying confined aquifers. Studies in southern New Castle County have demonstrated
167 the long-term susceptibility of these deeper aquifers where they subcrop beneath the unconfined surficial aquifer. The Department is responsible for taking appropriate action to eliminate existing ground water contamination problems and reduce the likelihood of future ground water contamination. This is being accomplished by both regulatory programs (e.g., Underground Injection Control, Underground Storage Tank, RCRA, etc.) and non-regulatory programs (e.g., Pollution Prevention, Non-point Source, etc.).
IV.2 Factors affecting Ground-Water Availability
IV.2.1 Delaware's Water Budget Annual precipitation in Delaware ranges from 30 to 58 inches and averages 44 inches. The annual precipitation rate usually exceeds the evapotranspiration rate by 12 to 18 inches. During summer when temperatures are high and plants are most active, virtually all of the precipitation is lost to evapotranspiration or overland flow. As a result, very little water is left to recharge aquifers and water levels in the water-table aquifer generally decline between the months of April and October. Ground-water levels tend to rise again during the late fall and winter. The amount of precipitation that recharges the water-table aquifer averages about 16 inches per year in (Johnston, 1976) or 760,000 gallons per square mile per day. This water eventually discharges to streams, rivers, bays, and the Atlantic Ocean, is captured by pumping wells, or recharges deeper, confined aquifers. Shallow ground water is particularly important to the hydrologic regime of Delaware’s streams. A study conducted by Johnston (1976), which included four small basins in the Atlantic Coastal Plain of Delaware, concluded that ground- water discharge (i.e., base flow) constitutes approximately 80 percent of surface-water flow. Excessive pumping of water from wells in the water-table aquifer can be at the expense of stream flow. During late summer stream flow often declines to only 100,000 gallons per day per square mile. Precipitation data for the reporting period are summarized by county in Figures IV-1A (New Castle County), IV-1B (Kent County), and IV-1C (Sussex County). With reference to these figures, long-term monthly precipitation averages at each precipitation-gauging station are provided for reference. Note that the averages for each station are based on monthly measurements recorded since 1949. In general, Delaware received average to below-average precipitation from January 2002 thru August/September 2002 (Figures IV-1A, B, and C); this deficit resulted in drought conditions that necessitated water-use restrictions in New Castle County. From September/October 2002 thru December 2003, Delaware generally received average to above-average precipitation (Figures IV-1A, B, and C). Figures IV-2 and IV-3 illustrate changes in ground-water levels in the water-table (unconfined) and artesian (confined) aquifers, respectively, for the 2002-2003 reporting period. As indicated on these figures, water-level data are from digital records made available by the Delaware Geological Survey (http://www.udel.edu/dgs/Hydrology/histgw.html). As shown in Figure IV-2, water levels in water-table well Db24-10 clearly illustrate the effects of the 2002 drought, with record-low water levels recorded over several consecutive months during that year. Subsequent to the drought, water levels in all four water-table wells rebounded to above-average and, in some cases, record-high levels during 2003 or early, depending on the well. The rebound is most
168 State of Delaware 2004 Combined 305(b) Report and 303(d) List evident in well Db24-10, where drought water levels (~17 ft bls) rose to post-drought levels (~7 ft bls) over a period of about eight months. Water levels in artesian wells (Figure IV-3) are affected more by water withdrawals than hydrologic conditions.
169 (A) New Castle County (measured at the New Castle County Airport)
10 9 8 7 6 5 4 3 2 Precipitation, in inches in Precipitation, 1 0 Jan-02 Feb-02 Mar-02 Apr-02 May-02 Jun-02 Jul-02 Aug-02 Sep-02 Oct-02 Nov-02 Dec-02 Jan-03 Feb-03 Mar-03 Apr-03 May-03 Jun-03 Jul-03 Aug-03 Sep-03 Oct-03 Nov-03 Dec-03
Reporting period (2002-03) Long-term monthly average
(B) Kent County (measured at Dover)
10 9 8 7 6 5 4 3 2 Precipitation, in inches in Precipitation, 1 0 Jan-02 Feb-02 Mar-02 Apr-02 May-02 Jun-02 Jul-02 Aug-02 Sep-02 Oct-02 Nov-02 Dec-02 Jan-03 Feb-03 Mar-03 Apr-03 May-03 Jun-03 Jul-03 Aug-03 Sep-03 Oct-03 Nov-03 Dec-03
Reporting period (2002-03) Long-term monthly average
(C) Sussex County (measured at the University of Delaw are Georgetow n Farm)
10 9 8 7 6 5 4 3 2 1 Precipitation, in inches 0 Jan-02 Feb-02 Mar-02 Apr-02 May-02 Jun-02 Jul-02 Aug-02 Sep-02 Oct-02 Nov-02 Dec-02 Jan-03 Feb-03 Mar-03 Apr-03 May-03 Jun-03 Jul-03 Aug-03 Sep-03 Oct-03 Nov-03 Dec-03
Reporting period (2002-03) Long-term monthly average
Figure IV-1. Graphs showing precipitation received at (A) New Castle County, (B) Kent County, and (C) Sussex County during the 2002-2003 reporting period. Data are from the Delaware Geological Survey (http://www.udel.edu/dgs/Hydrology/historical/histprecip.xls).
170 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Hydrograph for well Db24-10, water-table aquifer
4 6 8 10 12 14 PENNSYLVANIA 16 18
Depth to water, in ft below land surface R E V Jul-03 Jul-02 I Oct-03 Jun-03 Oct-02 Jun-02 Jan-04 Jan-03 Jan-03 Apr-03 Jan-02 Jan-02 Apr-02 Nov-03 Mar-03 Nov-02 Mar-02 Aug-03 Aug-02 Dec-03 Sep-03 Dec-02 May-03 Sep-02 May-02 R E Long-term monthly mean water level Highest monthly water level of record Db24-10 R Lowest monthly water level of record Reporting period water levels (2002-03) WA A L N E D Hydrograph for well Hb14-01, water-table aquifer
0 2 4 NEW 0 5 10 15 MILES 6 CASTLE 8 COUNTY 0 5 10 15 20 KILOMETERS 10 Hb14-01 12 14 Depth to water, in ft below land surface Jul-03 Jul-02 Oct-03 Jun-03 Oct-02 Jun-02 Jan-04 Jan-03 Jan-03 Apr-03 Jan-02 Jan-02 Apr-02 Nov-03 Mar-03 Nov-02 Mar-02 Aug-03 Aug-02 Dec-03 Sep-03 Dec-02 May-03 Sep-02 May-02
Long-term monthly mean water level Highest monthly water level of record Lowest monthly water level of record Reporting period water levels (2002-03)
M
A
R
Hydrograph for well Md22-01, water-table aquifer Y
L D A E 0 N KENT L D A 2 COUNTY W A 4 R E B 6 A Md22-01 Y 8
10
12 Depth to water, in ft below land surface Jul-03 Jul-02 Jun-03 Oct-03 Jun-02 Oct-02 Jan-04 Jan-03 Jan-03 Apr-03 Jan-02 Jan-02 Apr-02 Nov-03 Mar-03 Nov-02 Mar-02 Aug-03 Aug-02 Dec-03 Dec-02 May-03 Sep-03 May-02 Sep-02
Long-term monthly mean water level Highest monthly water level of record A SUSSEX T Lowest monthly water level of record Reporting period water levels (2002-03) L
COUNTY AN
T
I Hydrograph for well Qe44-01, water-table aquifer C
O
C
2 Qe44-01 E
A
4 N
6
8 MARYLAND 10
12
14 Depth to water, in ft below land surface Jul-02 Jul-03 Jun-02 Jun-03 Oct-02 Oct-03 Jan-02 Jan-02 Apr-02 Jan-03 Jan-03 Apr-03 Jan-04 Mar-02 Nov-02 Mar-03 Nov-03 Aug-02 Aug-03 May-02 Dec-02 May-03 Sep-02 Dec-03 Sep-03
Long-term monthly mean water level Highest monthly water level of record Lowest monthly water level of record Reporting period water levels (2002-03)
Figure IV-2. Hydrographs (left) and location map (right) for selected water-table (unconfined) observation wells in Delaware.
171 Hydrograph for well Ec32-07, Potomac aquifer
30
50
70
90
110
130 PENNSYLVANIA Depth to water,ft in belowsurfaceland Jul-03 Jul-02 Oct-03 Jun-03 Oct-02 Jun-02 Jan-04 Jan-03 Jan-03 Apr-03 Jan-02 Jan-02 Apr-02 Nov-03 Mar-03 Nov-02 Mar-02 Aug-03 Aug-02 Dec-03 Sep-03 May-03 Dec-02 Sep-02 May-02 R E Long-term monthly mean water level Highest monthly water level of record V I Lowest monthly water level of record Reporting period water levels (2002-03) R E R A W A Hydrograph for well Id55-01, Piney Point aquifer L N E D 60 Ec32-07 80
100 NEW 120 CASTLE 0 5 10 15 MILES 140 COUNTY 0 5 10 15 20 KILOMETERS 160
180 Depth to water, in ft below land surface Jul-03 Jul-02 Oct-03 Jun-03 Oct-02 Jun-02 Jan-04 Jan-03 Jan-03 Apr-03 Jan-02 Jan-02 Apr-02 Nov-03 Mar-03 Nov-02 Mar-02 Aug-03 Aug-02 Dec-03 Sep-03 Dec-02 May-03 Sep-02 May-02 Long-term monthly mean water level Highest monthly water level of record Id55-01 Lowest monthly water level of record Reporting period water levels (2002-03)
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L D A E 80 N KENT L D A COUNTY W 90 A R E 100 B A 110 Y
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N 60 65 70 MARYLAND 75 80 85 90 95 100 Depthto water, ft in below surface land Jul-03 Jul-02 Oct-03 Jun-03 Oct-02 Jun-02 Jan-04 Jan-03 Jan-03 Apr-03 Jan-02 Jan-02 Apr-02 Nov-03 Mar-03 Nov-02 Mar-02 Aug-03 Aug-02 Dec-03 Sep-03 Dec-02 May-03 Sep-02 May-02
Long-term monthly mean water level Highest monthly water level of record Lowest monthly water level of record Reporting period water levels (2002-03)
Figure IV-3. Hydrographs (left) and location map (right) for selected artesian (confined) observation wells in Delaware.
172 State of Delaware 2004 Combined 305(b) Report and 303(d) List
IV.2.2 Geology, Hydrogeology, and Ground-Water Recharge Potential
IV.2.2.1 Geology Delaware is situated in two physiographic provinces that are separated by the Fall Line. The Fall Line represents the demarcation that separates the Piedmont Province to the north and the Atlantic Coastal Plain Province to the south and extends, in general, from the City of Wilmington to the City of Newark. Figure IV-4 is a generalized geologic map for Delaware and shows the location of these two provinces and the Fall Line. The Piedmont Province consists of very old igneous and metamorphic rocks, and occupies approximately six percent of the State's land area. Schenck et al. (2000) completed detailed geologic mapping of the Piedmont of Delaware and adjacent Pennsylvania. A report entitled “Bedrock geology of the Piedmont of Delaware and adjacent Pennsylvania” (Plank et al., 2000) accompanies this map. For additional information concerning Delaware’s Piedmont geology, the reader is directed to these two publications and their associated reference sections. The Piedmont Province in Delaware contains the Cockeysville Formation. This formation is a fractured and solution-dissolved marble and dolomite that is able to transmit ground water and serves as an important local aquifer. The formation has been extensively studied by both the Delaware Geological Survey (e.g., Woodruff and Plank, 1995) and the U.S. Geological Survey (e.g., Werkheiser, 1995). Findings presented by Werkheiser (1995) indicate that water withdrawals from the aquifer are currently at their maximum. However, most water withdrawn in the Piedmont area is from surface water intakes on the Brandywine River and from Red and White Clay creeks. The Atlantic Coastal Plain Province consists of a southeastwardly thickening sequence of unconsolidated and semi-consolidated sediments that rest unconformably on crystalline basement rock. In general, these deposits, which are of fluvial and marine origin, dip gradually toward the southeast and form a sediment wedge. The thickness of this sediment wedge is approximately 10,000 feet in southeastern Delaware.
IV.2.2.2 Hydrogeology The Atlantic Coastal Plain sediments previously described contain the principal aquifer systems in the State. All of the aquifers are used in some capacity as a source of potable water. South of the C & D Canal, ground water from these aquifers provides almost all of the freshwater needed for all uses, and all of the drinking water is derived from ground water. The principle hydrologic units in the Atlantic Coastal Plain of Delaware include, from oldest to youngest, the Potomac, Magothy, Englishtown-Mt. Laurel, Rancocas, Piney Point, Cheswold, Federalsburg, Frederica, Milford, Manokin, Pocomoke, and Columbia aquifers. The latter blankets most of the state and is important for water supply, base flow to streams and rivers, and recharge to deeper, confined aquifers. Hydrologic units recognized in Delaware and their associated well yields are summarized in Table IV-1. Figure IV-4 illustrates the generalized subcrop areas for some of the confined aquifers. Figure IV-5 is a cross-sectional diagram of the major aquifers found in Delaware.
173 More detailed geohydrologic mapping in Delaware has been completed for the Dover area (Woodruff, 1972), Newark area (Woodruff, 1977, 1978), Wilmington area (Woodruff, 1981, 1984a, 1984b, 1985), Milford area (Talley, 1982), northern coastal area (Andres, 1986, 1987a), Chesapeake and Delaware Canal area (Woodruff, 1986, 1988), southern coastal area (Talley, 1987, 1988), Middletown-Odessa area (Woodruff, 1990), Seaford area (Andres, 1994), and Smyrna-Clayton area (Andres, 2001).
174 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Table IV-1. Hydrologic and geologic units recognized in Delaware. Table modified after the Delaware Geological Survey (http://www.udel.edu/dgs/Hydrology/hydrostrat.html). Age Geologic Units Hydrologic Units Holocene Carolina Bay deposits upland bog deposits Cypress Swamp Columbia/ Unconfined/ Pleistocene aquifer - poor to Fm. excellent yield, minor confining beds Nanticoke deposits Pleistocene Scotts Corners Fm. Lynch Heights Fm. Confining unit over Columbia aquifer only in Omar Fm. southeastern Sussex County - minor poor aquifer Staytonville unit Columbia Fm. Columbia/ Unconfined/ Pleistocene aquifer - poor to excellent yield, minor confining beds Pliocene Beaverdam Fm. Interbedded confining units and Pocomoke aquifer - Bethany fm. fair to excellent yield Manokin aquifer - fair to excellent yield and Manokin fm. confining beds St. Marys Fm. Confining beds - minor poor aquifer Interbedded unnamed aquifers; fair to good yields, Choptank Fm. and confining units Milford aquifer - fair to good yield Miocene Confining beds Frederica aquifer - fair to good yield Confining beds Calvert Fm. Federalsburg aquifer - fair to good yield Confining beds Cheswold aquifer - fair to excellent yield Confining beds Glauconitic unit of Oligocene Oligocene age
Glauconitic unit of Eocene late Eocene age
175 Piney Point Aquifer - poor to excellent yield, Piney Point Fm. interbedded confining units Shark River Fm. Confining Beds Deal Fm. Manasquan Fm. Rancocas aquifer - fair to good yield, interbedded Vincentown Fm. confining units Paleocene Hornerstown Fm. Confining beds Navesink Fm. Mount Laurel Fm. Mount Laurel Aquifer - poor to good yield Marshalltown Fm. Confining bed Englishtown Fm. Englishtown Aquifer - fair to good yield Cretaceous Merchantville Fm. Confining bed Magothy Fm. Magothy Aquifer - fair to good yield Potomac aquifers and confining units - fair to Potomac Fm. excellent yields Post-rift unconformity rocks Triassic and (of Jurassic age) Jurassic Rift basin rocks (inferred) Poor yield (<10 gallons per minute (gpm)) Fair yield (10-50 gpm) Good yield (50-500 gpm) Excellent yield (>500 gpm)
176 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Figure IV-4. Generalized Geologic Map of Delaware (from Pickett, 1976).
177
State of Delaware 2004 Combined 305(b) Report and 303(d) List
179 Figure IV- 5. Generalized geologic cross section of the Coastal Plain of Delaware (from Pickett, 1976).
IV.2.2.3 Ground-Water Recharge Potential In 1990 DNREC began working with the Delaware Geological Survey to map ground-water recharge potential for the entire state. Ground-water recharge potential is the relative ability of water to pass from the land surface into the underlying aquifer. A rating of excellent, good, fair or poor is assigned based on the relative amount of sand, silt and clay within the first 20 feet of land surface. The excellent areas are those with a very high percentage of sand in that 20-foot interval. Andres (1991) describes the methodology, defines the rating approach, and provides a means of challenging a rating at a specific parcel of land. As with any mapping project, the number of data points dictates the placement of lines between areas, and the addition of more data points helps refine the line. Recharge mapping for the entire Coastal Plain of Delaware is now complete. Butoryak and Talley (1993) mapped ground-water recharge potential in the Coastal Plain of New Castle County. New Castle County adopted the excellent areas as one of several Water Resource Protection Areas (WRPAs) in their Water Resource Protection Area ordinance. A map showing the distribution of these recharge protection areas in New Castle County is presented in Figure IV-6. Andres (2003a) and Andres (2003b) depict the recharge-potential in Kent and Sussex counties, respectively. This work was completed on a 7.5-minute quadrangle basis in accordance with methodology described by Andres (1991). The maps depict the four recharge potential areas and are available in both hard copy and digital format. Figure IV-7 is a map showing areas of excellent recharge potential in Kent and Sussex counties. In 2001, the Delaware General Assembly passed a bill that recognized both excellent ground- water recharge areas and wellhead protection areas as critical resource areas which must be addressed by the local governments. This includes the three counties and about a dozen municipalities with 2000 or more residents.
IV.2.3 Water Use in Delaware Water-use information, which is published by the U.S. Geological Survey every five years, was not available for 2000 at the time of this ground-water assessment preparation. For discussion on the most recent (1995) water-use information for Delaware, the reader is directed to the 2000 305(b) ground-water assessment or Wheeler (1995). The raw water-use data for 1995 are presented in Solley et al. (1998). If available, water use for 2000 will be summarized in the 2006 305(b) ground-water assessment section. Well permit issuances for the 2002-2003 reporting period are summarized in Table IV-2. All data have been refined to the county level. This information demonstrates the continued and increasing reliance on ground water for fresh water needs throughout the state. For each of the reported years, well over 2,000 domestic well permits and over 100 public well permits were issued. Well over 50% of these well permits were issued in Sussex County alone, due to increased development in this largely rural county. Kent County had the second highest number of permit issuances; New Castle County had the least number of permit issuances. The number of permits issued in New Castle County likely indicates the trend toward increasing reliance on ground water noted in the previous report and is the result of full utilization of fresh water
180 State of Delaware 2004 Combined 305(b) Report and 303(d) List
supplies from surface water. In addition, the southern part of New Castle County is experiencing a considerable amount of residential development with corresponding use of wells for public and domestic water supplies. The impact of the drought of 2002 is seen in the number of permit issuance with more irrigation and agricultural permits issued in the 2002 than in 2003, with 632 and 429 permits, respectively. Table IV-2. Summary of well permit issuances for the 2002-2003 reporting period.
Well 2002 2003 All Years Type Kent New Castle Sussex Total Kent New Castle Sussex Total Total Agricultural 118 18 323 459 87 11 205 303 762 Domestic 1008 211 1438 2657 886 136 1230 2252 4,909 Recharge/Injection 4 28 32 3 4 42 49 81 Dewatering 9 1 28 38 32 13 77 122 160 Recovery1236 52713 Heat Pump Supply 2 24 26 4 36 40 66 Heat Pump Recharge Industrial/Ind - MW 1 2 3 2 1 3 6 Irrigation 60 2 111 173 54 8 64 126 299 Monitor 279 312 176 767 189 479 159 827 1594 Observation 14 25 30 69 2 21 8 31 100 Public 33 16 72 121 36 19 56 111 232 Other** 31 44 56 131 20 49 35 104 235 Total 1559 861 2291 4711 1315 746 1914 3975 8686
Source: Delaware Water Use Data System **Other includes the following classes: Unknown, Temporary, Fire Protection, Geoprobe, Geothermal, Other, Engineer Test Boring
181 IA N A V L Y S N N E P
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Figure IV-6. Recharge Water Resource Protection Areas (WRPAs) in New Castle County, Delaware (modified after Butoryak and Talley, 1993).
182 State of Delaware 2004 Combined 305(b) Report and 303(d) List
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MARYLAND Figure IV-7. Areas of excellent ground-water recharge potential in Kent and Sussex Counties, Delaware. Modified after mapping by A. Scott Andres et al. of the Delaware Geological Survey. Mapping methodology is described by Andres (1991).
183 IV.3 Ground Water-Surface Water Interactions The most pressing interactions between ground and surface waters in Delaware occur in coastal areas, particularly in Sussex County. Historically, saltwater intrusion has occurred as a result of ground-water withdrawal activities in coastal areas or along tidal streams, with both public and domestic water-supply wells having been affected. Monitoring networks are maintained along the coasts of New Castle County and Sussex County. The New Castle County network is restricted to wells completed in the Potomac aquifer system. Salt-water intrusion is discussed in more detail in Section IV.4.10.3. As stated previously, ground-water discharge (i.e., base flow) has been shown to constitute approximately 80 percent of surface-water flow in Coastal Plain streams (Johnston, 1976). Modeling work conducted by Andres (1987b) in the Inland Bays of coastal Sussex County indicates that fresh ground-water discharge to the bays may range from 21 to 43 million gallons per day. Follow-up work by Andres (1992) suggests that, on an average annual basis, nitrate “flux” to the Indian River and Rehoboth Bays from direct ground-water discharge may range from 1,303 to 2,500 pounds per day. Because of the importance of base flow to the hydrologic regime of Coastal Plain streams, additional study of ground water-surface water interactions in these areas is needed and is especially important for the determination of non-point source total maximum daily loads (TMDLs). In recognition of the contribution of nutrient loading to the Inland Bays from ground-water discharge, the DNREC designed a study to assess the areal distribution of nutrients in ground water within the Indian River, Indian River Bay, and Iron Branch watersheds in Sussex County. The non-point source components of the TMDL goals for nutrients for these watersheds are considerable and require a detailed understanding of the overall nutrient concentration distributions. Sampling activities, which began in late 2001 and ended in September 2003, involved the collection of ground-water samples from 255 wells completed in the surficial (Columbia) aquifer. Samples were analyzed for field parameters (pH, temperature, dissolved oxygen, and specific electrical conductance), major ions, and nutrients (nitrate+nitrite as N, ammonia as N, and phosphorus). At present (March 2004), project staff are in the data analysis and report preparation phase. This information is to be used to identify areas of the watershed most in need of nutrient reductions in ground water. Future sampling of the network may allow for assessment of long-term trends of nutrients in ground water. Work conducted by Werkheiser (1995) in the Cockeysville aquifer in northern New Castle County illustrates a somewhat different ground water-surface water interaction. Mill Creek, which originates in a noncarbonate geologic setting and flows over the carbonate, Cockeysville Formation, was found to lose water (about 0.55 million gallons per day) to the outcrop area of this formation. In addition, temperature anomalies were identified in ground-water wells indicating rapid flow from surface water to ground water, likely due to fractures in the formation. Werkheiser (1995) concluded that reduction in base flow in noncarbonate areas upstream of the Cockeysville outcrop could significantly reduce recharge to the Cockeysville aquifer.
IV.4 Potential Sources of Ground-Water Contamination Ground water in Delaware is vulnerable to activities that may contaminate it and render it undrinkable. Delaware's soils are very permeable in many parts of the State and facilitate the
184 State of Delaware 2004 Combined 305(b) Report and 303(d) List movement of contaminants from the land surface into the water table. The existing or potential sources of ground-water contamination are listed in Table IV-3. The types of sources are basically unchanged since the previous report with the seven highest priority sources being animal feedlots (including poultry), federal/state superfund sites, fertilizer application, hazardous waste sites, salt water intrusion, septic systems, and underground storage tanks (primarily petroleum). Both non-regulatory and regulatory programs are addressing these and other sources. Tables IV-4, IV-5, and IV-6 provide current information on potential point sources of ground- water contamination in New Castle County, Kent County, and Sussex County, respectively. Table IV-7 summarizes this information for the entire state. For a basin-scale presentation of similar information, the reader is referred to DNREC’s assessment reports for the Chesapeake Bay basin (DNREC, 2001a), the Inland Bays/Atlantic Ocean basin (DNREC, 2001b), and the Piedmont Basin (DNREC, 1997). The Delaware Basin Assessment Report has not yet been published. Note that a detailed discussion of the Inland Bays/Atlantic Ocean assessment is included in the Inland portion of the 2000 305(b) Report. This presentation is similar to those provided for the Chesapeake Basin in the 1998 305(b) and for the Piedmont Basin in the 1996 305(b). Once completed, the Delaware River Basin watershed report information will be summarized in an upcoming 305(b) report. Discussions of selected contaminant sources are provided below.
IV.4.1 Septic Systems Septic systems are a source of nitrate and bacteriological contamination. If a septic system is designed properly the soil medium will filter out pathogenic organisms from sewage effluent; however, soil is not an effective agent in the removal of oxidizable nitrate compounds. Elevated nitrate concentrations have been found in ground water above EPA's maximum contaminant level in many areas of the State. In areas of poor drainage and high seasonal water table septic system overflow or failure can lead to bacterial contamination of ground and surface waters. Pathogenic organisms may travel with overland water flow and contaminate improperly grouted shallow wells and/or surface water bodies. To prevent the possibility of a septic system contaminating a drinking water well, a minimum isolation distance of 100 feet between septic systems and unconfined wells was adopted in the 1985 Regulations Governing the Design, Installation and Operation of On-Site Wastewater Treatment and Disposal Systems (amended March 11, 2002). Domestic septic systems continue to be a common practice for domestic wastewater disposal; however, areas of the state, particularly in eastern Sussex County, have continued to expand central sewer facilities, thus eliminating existing septic systems in expanded service areas. 4977 new domestic septic permits were issued during 2002-2003; of these, 54.9% were in Sussex County, 33.5% were in Kent County, and 11.6% were in New Castle County. This compares well with the number of domestic well permits issued over the same period with 4,909 domestic well permits issued with 54% issued in Sussex County. The Department estimates that, as of 1997, there were approximately 78,600 septic systems statewide. This information is based on a project that counted the number of dwellings outside sewer districts on 1997 aerial photographs. Of these, 20% are in New Castle County, 53% in Sussex County, and 27% in Kent County.
185 Septic systems that discharge in excess of 2,500 gallons per day are permitted as large septic systems. These systems are operated by a licensed operator and may have monitoring wells on site to evaluate the septic system’s effectiveness. Prior to installation of new large septic systems, an assessment of the impact of these systems on ground water, nearby potable wells, and surface water bodies is conducted to prevent contamination of these potential receptors. There are approximately 88 large septic systems currently operating statewide. Of these, 60 (68.2%) are in Sussex County, 17 (19.3%) are in Kent County, and 11 (12.5%) are in New Castle County. The overall decrease represents work on regionalization of wastewater treatment.
IV.4.2 Solid Waste Landfills The types of landfills found in Delaware include sanitary and industrial. Other facilities involved in non-hazardous waste treatment or management include resource recovery facilities, transfer stations, infectious waste facilities, and closed sites. There are 8 active landfill sites in Delaware and others that are closed and managed by other programs. Sanitary Landfills - The material found in this type of landfill is composed of municipal garbage, commercial waste, some industrial waste, and relatively inert substances. Resulting contamination could be in the form of high dissolved solids, chemical and biochemical oxygen demand, and some volatile organic compounds. Currently, the Delaware Solid Waste Authority owns and operates the three active sanitary landfills in Delaware, one in each of the three counties. These facilities require extensive investigation prior to siting and require stringent source control and monitoring during operation. Impermeable liners are used to prevent leachate from reaching ground water and a ground-water monitoring well network is installed around the site to assess migration from the site. Industrial Landfills - These types of landfills are site specific as to the nature of the material received. There are presently 5 (five) active industrial landfills in Delaware. They may contain various types of materials including plastics, metals, fly ash, sludges, coke, ore, waste pigment particles, low-level radioactive wastes, polypropylene, wood, brick, cellulose, ceramics, synthetics, and other similar substances. These facilities require extensive investigation prior to siting and require stringent source control and monitoring during operation.
IV.4.3 Underground Storage Tanks Leaking underground storage tanks and pipelines are recognized as a widespread source of ground water contamination. Numerous domestic wells and several public supply wells have been replaced or taken out of service as a direct result of contaminant release from leaking underground storage tanks. Delaware promulgated regulations for underground storage tank installation and monitoring of storage tanks in July 1986 which were later amended in September of 1990. Heating oil tanks over 2,000 gallons are required to meet minimum installation standards, however smaller storage tanks such as domestic heating oil tanks are not regulated. DNREC’s Tank program administers the state UST and AST regulations and regulates commercial, non-heating oil petroleum and hazardous substance UST’s over 110 gallons as well as agricultural, residential, and heating oil UST’s over 1,100 gallons, and all leaking UST’s. There are approximately 12,050 regulated USTs at 3,896 facilities of which 2,399 tanks at 1,092 facilities are currently in use. 9,651 USTs have been removed from the ground or properly abandoned in place. Since leaking UST problems were recognized in the early 1980s
186 State of Delaware 2004 Combined 305(b) Report and 303(d) List
approximately 314040 releases have been confirmed. Of these, 2,800 have been closed. Over the period 2002-2003, 142 sites had confirmed releases with 30 confirmed ground water releases. Of the confirmed ground water releases, 43.3% were in New Castle County, 30.0% in Kent County, and 26.7% in Sussex County. The Tank Management Branch (TMB) uses the UST Access database and DEN to maintain an up-to-date file of facility names, owners, number of tanks, and status. Also, this database will be compatible with the Department’s data integration efforts. The UST program has used prepared maps of public drinking water supplies and recharge areas for New Castle, Kent, and Sussex Counties since 1990 to determine if a new UST is close enough to a public water supply to warrant secondary containment. The maps are entitled Tank Area Secondary Containment (TASC) maps. The location of leaking UST’s and most UST’s are also mapped and are included in DNREC's GIS. Since the deadline in December 1998 for all in use USTs to have equipment for early detection of leaks and for corrosion protection, the number of reported releases from USTs has declined. DNREC's UST program continues to enforce compliance with operating requirements for in use USTs as well as to require timely investigation and remediation of all suspected and confirmed releases from USTs. In July 2002, the Jeffrey Davis Above Ground Storage Tank Act was passed and signed into law. Aboveground storage tanks above 12,500 storing hazardous substances and gasoline or 40,000 gallons and greater storing heating fuel, diesel, kerosene or jet fuel are now regulated. Regulations are expected to be adopted by July 2004 covering installation, operation, maintenance and corrective action at regulated ASTs. In addition, all commercial ASTs above 250 gallons must register with the Department. The TMB has created a database to manage the AST registration information. No specific data is yet available on releases from ASTs.
IV.4.4 Hazardous Substance Release Sites DNREC has identified over 602 sites in Delaware as potential hazardous substance release sites. Of which, 476 sites have a higher priority because they are either a site in the State’s Voluntary Cleanup Program (VCP) or they pose a risk to public health, welfare, and/or the environment. Of these 476 sites, 459 sites are being addressed either as a HSCA enforcement site, or as a VCP site. There are 17 Sites in Delaware that have been placed on EPA’s National Priority List. Also the RCRA Corrective Action Program is addressing 10 Sites listed on the HSCA inventory list. DNREC is currently addressing 295 sites under HSCA, and 164 sites are currently undergoing investigation and cleanup under the Voluntary Cleanup Program (VCP)/ Brownfields Program. Cleanups have been completed at 138 sites, resulting in over 1,500 acres of underutilized property being returned to possible productive use. In the last two (2) years, DNREC-SIRB has addressed Formerly Used Defense Sites (FUDS) as part of its Pre-Remedial Grant, four (4) sites have been investigated. These sites have undergone a Pre-Screening Assessment in order to provide necessary data to make a determination whether or not to continue pursuing a Site Inspection (SI) of these sites. One (1) FUDS has undergone an SI, which is a process that evaluates the extent to which a site presents a threat to human health or the environment. Additionally, Targeted Brownfields Assessments (TBA) have been completed at 23 sites. TBA’s are investigations performed in strategic locations that have been identified by municipalities as areas of economic growth.
187 IV.4.5 Hazardous Waste Land Disposal Units In Delaware, there are 7 hazardous waste land disposal units that have impacted ground water. These units are regulated by the State’s Solid and Hazardous Waste Program and require permits for operation as well as post closure. Currently only one unit, Motiva’s hazardous waste landfill, which received refinery wastewater treatment plant sludges, is considered an operating unit. The other 6 units have closed and have been issued post-closure permits. These 7 units and associated contaminants of concern are: Facility Unit Contaminants of Permitting Status Concern Motiva Land Treatment VOCs, SVOCs, Post Closure Permit Unit Metals issued Motiva CPI Surge Basin VOCs, SVOCs, Post Closure Permit Metals issued Motiva Landfill VOC, Metals Closure Pending Atlantic Coast Waste Pile Solvents Post Closure Permit Environmental issued
Oxy Chem Landfill Mercury Post Closure Permit Issued Dover Air Force Surface Solvents Post Closure Permit Base Impoundment Issued Hercules Research Landfill VOCs, SVOCs, Post Closure Permit Center metals issued
State of Delaware Hazardous Waste Regulations require the owner/operator of a hazardous waste land disposal unit to establish a ground water monitoring network surrounding the unit to determine if a release of hazardous waste has taken place. The level of monitoring and/or remediation required is determined on a unit-by-unit basis based on the type and concentration of contaminant and its potential to do harm to human health and the environment.
IV.4.6 RCRA Corrective Action Sites The RCRA Corrective Action Program is a state wide environmental investigation and clean-up program, similar to Superfund, designed to clean-up releases of hazardous waste at facilities required to obtain a RCRA permit for the on-site treatment, storage, and disposal of hazardous waste. The State has thirteen sites that are subject to RCRA Corrective Action authorities. Of the thirteen sites subject to RCRA Corrective Action, ten sites have impacted ground water.
IV.4.7 Injection Wells Injection wells are used in the State to return the water used for “water to air heat pump systems” to the aquifer. Contamination from these wells is virtually non-existent. The DNREC is initiating efforts to identify other types of class V wells, which may exist in the State, in order to evaluate
188 State of Delaware 2004 Combined 305(b) Report and 303(d) List
their impact on ground water. Injection of hazardous wastes and brine are specifically banned in Delaware due to the possibility of contaminating water supply aquifers. During the reporting period, one UIC permit has been issued for an Aquifer Storage and Recovery operation where potable water is returned to the aquifer for latter recovery by public water supply wells. This project is located in New Castle County, Delaware. The Underground Injection Control (UIC) Program is continuing to evaluate other classes of injection wells including those used by body shops, service stations, etc. The UIC staff has been working with the Tank Management Branch, issuing UIC permits to facilities involved in petroleum contamination remediation projects. The UIC program has issued 8 remediation project permits in 2002-2003. A total of 14 UIC permits were issued during this review period.
IV.4.8 Land Application and Treatment Land application and treatment of wastes includes spray irrigation, sludge application, application of food processing by-products, and percolation basins. Sources of these wastes include municipal wastewater treatment plants, community wastewater treatment plants, animal wastes, food processing operations, and textile dyeing operations. The wastes generated by these activities can cause contamination by nitrates, brine, metals, and volatile organic compounds. However, land application of waste has been shown to be a viable and environmentally safe disposal method if properly managed. There are currently 22 active and two inactive wastewater spray irrigation facilities in Delaware. Another four facilities are in various stages of design or review. The locations of all of the active facilities are being determined using GPS units and are being entered into the DNREC's GIS system. The DNREC requires ground-water monitoring at each of these sites. Some of these sites were included in ambient ground-water monitoring network in southern New Castle County (see Baxter and Talley, 1997). Most wastewater spray sites are found in Sussex County (18 sites). There are also 16 active or approved sludge application sites governed by 9 permits in the State. Additionally there are 3 application sites for food processing wastes governed by 3 formal approvals. Ground water monitoring is not required at each site, however, it is encouraged and many of the sites do have ground water monitoring. Of these, all are located in either Kent or Sussex County. Additional sites for land treatment of restaurant grease trap waste (GTW) have been approved under this program. Roughly 100,000 gallons of GTW are land applied onto approximately 20 total acres per month. The sites are located in Kent and Sussex Counties. The liquid waste contains primarily food waste (i.e. cooking oil, fat and polysaccharides) which is highly degraded in the soil/microbe matrix. The waste contains no contaminants of concern. There is no ground water monitoring at these sites. Activity is monitored by DWR. This practice may become commonplace as many wastewater treatment facility owners are refusing to accept GTW into their systems.
IV.4.9 Agricultural Activities Agricultural activities that may contribute to ground-water contamination include fertilizer and pesticide application, animal feedlots, and manure storage and disposal. These activities
189 contribute organically bound nitrogen, which is readily converted to nitrate under the aerobic soil conditions that exist in a substantial portion of the State. The nitrate produced primarily affects the shallow, unconfined aquifer and has been identified as the most common ground-water contaminant in the State. Best management practices (BMPs) have been developed to reduce and/or prevent pollution from fertilizer application and animal waste. In 1999, as a result of enactment of the Delaware Nutrient Management Law, the Delaware Nutrient Management Program was established. According to the program’s website (http://www.state.de.us/deptagri/nutrients/index.htm), the following are required to develop and implement a nutrient management or animal waste plan: All persons who operate an animal feeding operation in excess of 8 animal units (1 AU = 1,000 pounds). All persons who control/manage property in excess of 10 acres where nutrients are applied. The Delaware Department of Agriculture, in cooperation with the Delaware Geological Survey, completed a study of pesticides in shallow ground water in Delaware (Blaier and Baxter, 2000). Data presented by these workers are from approximately 350 ground-water samples collected from 136 monitoring points, which included domestic, agricultural, and monitoring wells less than 80 feet deep and distributed throughout most of the Atlantic Coastal Plain of Delaware. Analyses of ground-water samples were generally limited to the pesticides atrazine, alachlor, cyanazine, metolachlor, and simazine. Results presented by Blaier and Baxter (2000) indicated that pesticides were not detected in almost 80 percent of analyses, and concentrations were less than 1.0 micrograms per liter (µg/L) in 96 percent of the analyses. Alachlor was detected at concentrations above the PMCL (2 µg/L) in three wells located in Sussex County (PCMN62, PCMN122, and PCMN136). No other PMCL or State health advisory limit (HAL) exceedences were reported. Analytical data for pesticides and metabolites presented in a recent report by the U.S. Geological Survey (Ferrari, 2001) are in general agreement with results from Blaier and Baxter (2000). The USGS work involved the collection of raw ground-water samples from 30 randomly-selected, unconfined public water-supply wells. Water-quality analyses included 45 pesticides and 13 pesticide metabolites, all of which were generally less than 1.0 µg/L. No PMCL or HAL exceedences for pesticides were reported by Ferrari (2001). The DDA has a training and certification program for pesticide applicators to insure that pesticides are used in an environmentally responsible manor. The DDA and the DNREC, with EPA guidance, have drafted a State Pesticide Management Plan (PMP). The PMP emphasizes prevention and will allow the State to responsibly manage pesticides into the future.
IV.4.10 Naturally-Occurring Contaminants of Concern Naturally-occurring ground-water contaminants in Delaware include, but are not limited to, arsenic, radionuclides, saltwater, and iron. Each of these contaminants is discussed separately in the following sections.
IV.4.10.1 Arsenic There are presently limited data for the occurrence and distribution of ambient (naturally- occurring) arsenic in ground water in Delaware. A limited analysis of arsenic in ground water,
190 State of Delaware 2004 Combined 305(b) Report and 303(d) List
which was based on 61 raw ground-water samples collected and analyzed by Delaware’s Office of Drinking Water, was presented in the Ground-Water Assessment Section of the 2002 305(b) report. According to that analysis, arsenic was detected in 11 (18%) of 61 samples; however, none of the reported concentrations exceeded the PMCL for arsenic (0.05 mg/L). It was noted that sources of arsenic (naturally-occurring or anthropogenic) could not be ascertained from the data. According to the U.S. EPA (http://www.epa.gov/safewater/arsenic.html), on January 23, 2006 public water systems will have to comply with the new PMCL for arsenic (0.01 mg/L). Seven (11.5%) of the 61 analyses discussed previously showed concentrations of arsenic above 0.01 mg/L. More study of ambient arsenic in Delaware’s ground water appears to be warranted.
IV.4.10.2 Radionuclides Radionuclides include approximately 2,000 species of atoms (both naturally occurring and man- made), which, by way of radioactive decay, emit radiation in the form of alpha particles, beta particles, or gamma rays (Facozio et al., 2000). Alpha and beta radiation are composed of particle emissions that cannot penetrate the skin and, therefore, must be ingested in order to come in contact with internal tissue; gamma radiation, however, is an energy emission that can penetrate through skin and internal tissue (Facozio et al., 2000). The standard unit of measure for radioactivity in water is picocuries per liter (pCi/L). One pCi/L is equivalent to 2.2 radioactive disintegrations per minute per liter of water. Because they are known carcinogens, the U.S. EPA has established primary maximum contaminant levels (PMCLs) for beta particles and photon emitters (4 millirems per year), gross alpha particle activity (15 pCi/L), radium-226 and radium-228 combined (5 pCi/L), and uranium (0.03 mg/L). The proposed PMCL for radon-222, which is a gas that results from the radioactive alpha decay of radium-226, is 300 pCi/L. The Delaware Division of Public Health’s Office of Drinking water presently enforces PMCLs for gross alpha (15 pCi/L) and gross beta (4 pCi/L) activities. Studies conducted by the U.S. Geological Survey (Werkheiser, 1995; Bachman and Ferrari, 1995; Ferrari, 2001) have documented the presence of radionuclides in Delaware’s ground water. Werkheiser (1995), in his study of the hydrogeology of the Cockeysville aquifer and adjacent noncarbonate aquifer in northern Delaware, collected 29 ground-water samples for radon-222 analysis. Out of the 29 samples, 14 (48%) had radon-222 concentrations greater than 300 pCi/L. The average, minimum, and maximum radon-222 concentrations were 461, <80 (not detected above 80 pCi/L), and 2,500 pCi/L, respectively. Investigation of ground-water quality and geochemistry in southern New Castle County (Bachman and Ferrari, 1995) involved the collection of 21 samples for radon-222 analysis. The samples were collected from wells completed in the Magothy and Potomac aquifer system (six samples), the Englishtown-Mount Laurel aquifer system (eight samples), and the Rancocas aquifer (seven samples). Although radon-222 was detected in each aquifer system, concentrations greater than 300 pCi/L were limited to the Englishtown-Mount Laurel (seven out of eight samples) and the Rancocas (seven out of seven samples). The maximum radon-222 concentration detected (1,700 pCi/L) was in Englishtown-Mount Laurel well Eb43-09 in Summit, Delaware. Additional data for radon in ground water in southern New Castle County are presented by Baxter and Talley (1997).
191 The U.S. Geological Survey (Ferrari, 2002) assessed of the occurrence and distribution of selected contaminants in public drinking-water supplies in the surficial aquifer in Delaware. This assessment involved the collection of ground-water samples from 30 randomly-selected, unconfined public water-supply wells. A subset of 10 wells was sampled for gross alpha and gross beta activities, radium-224, -226, and -228, and radon-222. Although detectable levels of these radionuclides were identified, none of the activities exceeded a MCL. Only one sample showed a radon-222 activity above the proposed MCL (300 pCi/L).
IV.4.10.3 Saltwater Intrusion Saltwater intrusion in Delaware has been an historic problem along the Atlantic Coast, Delaware Bay and Estuary, and the Inland Bays. Public supply wells have been abandoned as a result of salt water intrusion and replacement wells installed farther inland to avoid the problem. As population increases and water use increases, the possibility for saltwater intrusion increases. This problem is one of the issues that has or is being addressed by the Governor's Task Force on the Inland Bays, the Delaware Geological Survey, the U.S. Geological Survey, and the States of Maryland and Delaware. The DNREC manages two programs to monitor for saltwater intrusion. The Delaware Geological Survey monitors a group of coastal wells screened in all of the major aquifers that are used for public water from the Town of Lewes to Fenwick Island State Park, all along the Atlantic Coast and Inland Bays. The DNREC also samples wells in coastal New Castle County in order to monitor for chlorides in the Potomac aquifer. The DNREC's Water Allocation Program monitors and regulates withdrawals from coastal wells to reduce the possibility of salt water intrusion. Yearly summaries of the Coastal Sussex network are prepared by the Delaware Geological Survey (Talley and Bounds, 2002; Talley, 2003). While there have been some water level decreases along some coastal aquifers, there have not been significant changes in chloride concentrations (beyond normal seasonal changes). This is true both during the 2002 drought and the wetter 2003 period. Water levels recovered somewhat in 2003 responding to the wetter conditions. Existing management strategies appear to be working with no major losses of public wells to saltwater during the reporting period. However, localized problems with salt water in a few shallow domestic wells persist primarily in the Inland Bays area and in some coastal communities along the Delaware Bay.
IV.4.10.4 Iron The secondary maximum contaminant level (SMCL) for iron (0.3 mg/L) is a non-enforceable standard because it may cause cosmetic effects such as taste or color. However, iron in ground water is a widespread problem in Delaware and many water supplies have treatment systems to remove iron. A limited analysis of iron in ground water, which was based on 561 raw ground-water samples collected and analyzed by Delaware’s Office of Drinking Water, was presented in the Ground- Water Assessment Section of the 2002 305(b) report. According to that analysis, iron exceeded the SMCL in 192 (34.22%) of 561 samples.
192 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Data presented by Ferrari (2001) indicated that five (16.7%) of 30 samples collected from 30 randomly-selected public water-supply wells completed in the unconfined, Columbia aquifer had iron concentrations in excess of the SMCL. One of the five wells was located in southern Kent County, while the remaining four were located in Sussex County. Note that out of the 30 wells sampled by Ferrari (2001), four (13.3%) were located in New Castle County, six (20%) were located in Kent County, and 20 (66.7%) were located in Sussex County.
193 Table IV-3. Potential sources of ground-water contamination in Delaware Ten Highest- Factors Considered in Relative Contaminant Source Priority Sources Selecting a Contaminant Contaminants (2) Priority (X) Source (1) Agricultural Activities Agricultural chemical facilities NA NA 1,2,5 Animal feedlots (including poultry) X HIGH A,C,D,F,G 5,8 Drainage wells -- NOT ALLOWED IN STATE -- Fertilizer applications X HIGH C,D,F 5 Irrigation practices (return flow) LOW NO INFORMATION -- Pesticide application MEDIUM G 1,2 Storage and Treatment Activities Land application MEDIUM D,H 9 Material stockpiles LOW D,H 9 Storage tanks (above ground) LOW G,H 4 Storage tanks (underground) X HIGH A,B,C,D,F,H 4 Surface impoundments LOW C,D,H 5 Waste piles LOW A,D 9 Waste tailings NA NA -- Disposal Activities Deep injection wells (heat pump) LOW A 9 Landfills MEDIUM D,G,H 3,7 Septic Systems X HIGH A,B,C,D,F,H 5,8 Shallow injection wells LOW A 9 Other Hazardous waste generators -- -- SEE HAZARDOUS WASTE SITES -- Hazardous waste sites (RCRA) X HIGH A,B,E,G,H 3,8 Industrial facilities -- -- SEE HAZARDOUS WASTE SITES -- Material transfer operations -- -- SEE HAZARDOUS WASTE SITES 1,2,3,4,7 Mining and mine drainage NA NA -- Pipelines and sewer lines MEDIUM G 5 Salt storage and road salting LOW A,B,D 6 Salt Water intrusion X HIGH B,E,F,G 6 Spills VARIABLE G 9 Transportation of Materials -- -- SEE HAZARDOUS WASTE SITES -- Urban runoff LOW C,E 9 Federal or State Superfund X HIGH F,G,H 3,4,7 (1) Factors used in selecting sources (2) Contaminant Classes A - Human health and/or environmental risk (toxicity) 1 - Inorganic pesticides B - Size of the population at risk 2 - Organic pesticides C - Location of the sources relative to drinking water sources 3 - Halogenated solvents D - Number and/or size of contaminant sources 4 - Petroleum compounds E - Hydrogeologic sensitivity 5 - Nitrate F - State findings, other findings 6 - Salinity/brine G - High priority in localized areas of the State 7 - Metals H - Regulated activity 8 - Bacteria -- - Data not available or not applicable 9 - Variable
194 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Table IV-4. Summary of known or potential sources of ground-water contamination in New Castle County, Delaware.
Number of Sites Number of Number of Number of Number of sites Number of that have been Total Number Number of Sites that Sites with Sites with sites with Present in with Confirmed Contaminants of Site Stabilized or have Source Type of Sites in are Listed and/or have Corrective Active cleanup County Ground Water Primary Concern Investigations had the Source County Confirmed Releases Action Plans Remediation completed Contamination (optional) Removed (optional) (optional) (optional) (optional)
Total for 2002 Total and 2003
Solvents, (TCE, PCE NPL//EPA Removal K1 K2 Yes ------Vinyl Chloride) ------
State Sites (non- Yes -- K1 -- *, K2 -- * TCE, PCE, Metals ------NPL) --
DOD/DOE/FUDS Yes -- --K1 -- K2 -- TCE ------
Benzene, Petroleum, LUST L1 L1 L1 L2 L3 L3 L2 Yes 1916 1916 101 13 MTBE 101 119 110 110 119
R1 LNAPLs, Metals, R2 RCRA Yes 8 8 -- 8 Inorganic Solvents 826-- --
Landfill Leachate, Coal Solid Waste Yes 4 4 -- 4 Ash ------
Underground Nitrates, Coliform, Yes 22 22 2 D2 D3 ------Injection Chloride
Large Septic Nitrates, Coliform, Yes 11 11 0 D2 D3 ------System Chloride
Nitrates, Coliform, Domestic Septic D2 D3 Yes 16,644 16,644 578 Chloride ------
D2 D3 Nitrates, Coliform, Spray Irrigation Yes 3 3 0 Chloride, Sodium ------
Land Treatment of Food Processing No 0 0 0 S1 D3 Nitrates ------& Grease Trap WasteS1
Sludge Application No 0 0 0 S1 D3 Nitrates ------PermitsS1 NPL - National Priority List D1 - Not Broken-down by County -- See State Summary Sheet N1 - One DOD site (Dover AFB) reported as NPL site DOE - Department of Energy D2 - Reported as new permit issuances R1 - Facilities undergoing corrective action DOD - Department of Defense D3 - Permitted ground-water discharges R2 - Sites in facility investigation stage or earlier FUDS - Formerly-Used Defense Sites L1 - Number of sites identified in 1998 and 1999 (subset of total) R3 - post closure permit LUST - Leaking Underground Storage Tanks L2 - Reported as total number of sites that are closed 1998-99 R4 - See county sheets for specific qualifiers RCRA - Resources Conservation and Recovery Act L3 - Reported as total corrective action plans approved 1998-99 S1 - Reported as active permits -- - Data not available or not applicable K1 - Reported as new sites identified in 2000-01 * - Estimated value K2 - Reported as new sites with ground-water contamination
195 Table IV-5. Summary of known or potential sources of ground-water contamination in Kent County, Delaware.
Number of Sites Number of Number of Number of Number of Sites that Number with Number of that have been Present Sites with Sites with sites with Total Number of are Listed and/or Confirmed Ground Contaminants of Site Stabilized or have Source Type in Corrective Active cleanup Sites in County have Confirmed Water Primary Concern Investigations had the Source County Action Plans Remediation completed Releases Contamination (optional) Removed (optional) (optional) (optional) (optional)
Total for 2002 Total and 2003
NPL Yes -- --K1 -- K2 -- TCE, PCE, Benzene ------State Sites (non- Yes -- K1 -- *,K2 -- * TCE, Metals ------NPL) --
DOD/DOE/FUDS No ------
Benzene, LUST L1 L1 L1 L2 L3 L3 L2 Yes 573 573 18 9 Petroleum,MTBE 18 29 27 27 29
RCRAR3 Yes 2 2 0 2 Solvents 21211
Solid Waste Yes 1 1 0 0 Landfill Leachate ------
Underground Nitrates, Coliform, Yes 25 25 6 D2 D3 ------Injection Chloride
Large Septic Nitrates, Coliform, Yes 17 D1 17 2 D2 D3 ------System Chloride
Nitrates, Coliform, Domestic Septic D2 D3 Yes 23,941 23,941 1,665 Chloride ------
Nitrates, Coliform, Spray Irrigation D2 D3 Yes 1 1 0 Chloride, Sodium ------
Land Treatment of Food Processing No 2 2 2 S1 D3 Nitrates ------& Grease Trap WasteS1
Sludge Application Yes 3 3 3 S1 D3 Nitrates ------PermitsS1 NPL - National Priority List D1 - Not Broken-down by County -- See State Summary Sheet N1 - One DOD site (Dover AFB) reported as NPL site DOE - Department of Energy D2 - Reported as new permit issuances R1 - Facilities undergoing corrective action DOD - Department of Defense D3 - Permitted ground-water discharges R2 - Sites in facility investigation stage or earlier FUDS - Formerly-Used Defense Sites L1 - Number of sites identified in 1998 and 1999 (subset of total) R3 - post closure permit LUST - Leaking Underground Storage Tanks L2 - Reported as total number of sites that are closed 1998-99 R4 - See county sheets for specific qualifiers RCRA - Resources Conservation and Recovery Act L3 - Reported as total corrective action plans approved 1998-99 S1 - Reported as active permits -- - Data not available or not applicable K1 - Reported as new sites identified in 2000-01 * - Estimated value K2 - Reported as new sites with ground-water contamination
196 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Table IV-6. Summary of known or potential sources of ground-water contamination in Sussex County, Delaware. Number of Sites Number of Number of Number of Number with Number of that have been Present Total Number Number of Sites that Sites with Sites with sites with Confirmed Ground Contaminants of Site Stabilized or have Source Type in of Sites in are Listed and/or have Corrective Active cleanup Water Primary Concern Investigations had the Source County County Confirmed Releases Action Plans Remediation completed Contamination (optional) Removed (optional) (optional) (optional) (optional)
Total for 2002 Total and 2003
NPL Yes -- --K1 -- K2 -- TCE, PCE ------
State Sites (non- K1 *,K2 W1 Yes ------* PAHs, TCE ------NPL)
DOD/DOE/FUDS Yes -- --K1 -- K2 ------
Benzene, Petroleum, LUST Yes 651 651 23 L1 8 L1 23 L1 32 L2 26 L3 26 L3 29 L2 MTBE
RCRAR1 Yes 1 1 1 Metals 1--1R2 -- --
Solid Waste Yes 3 3 2 Landfill Leachate ------
Underground Oils, TPH, BTEX, Yes 33 33 6 D2 D3 ------Injection Grease, Antifreeze
Large Septic Nitrates, Coliform, Yes 60 60 18 D2 D3 ------System Chloride
Nitrates, Coliform, Domestic Septic D2 D3 Yes 46,455 46,455 2,734 Chloride ------
Nitrates, Coliform, Spray Irrigation Yes 18 18 0 D2 D3 ------Chloride, Sodium
Land Treatment of Food Processing No 4 4 4 S1 D3 Nitrates ------& Grease Trap WasteS1
Sludge Application Yes 14 14 14 S1 D3 Nitrates ------PermitsS1 NPL - National Priority List D1 - Not Broken-down by County -- See State Summary Sheet N1 - One DOD site (Dover AFB) reported as NPL site DOE - Department of Energy D2 - Reported as new permit issuances R1 - Facilities undergoing corrective action DOD - Department of Defense D3 - Permitted ground-water discharges R2 - Sites in facility investigation stage or earlier FUDS - Formerly-Used Defense Sites L1 - Number of sites identified in 1998 and 1999 (subset of total) R3 - post closure permit LUST - Leaking Underground Storage Tanks L2 - Reported as total number of sites that are closed 1998-99 R4 - See county sheets for specific qualifiers RCRA - Resources Conservation and Recovery Act L3 - Reported as total corrective action plans approved 1998-99 S1 - Reported as active permits -- - Data not available or not applicable K1 - Reported as new sites identified in 2000-01 W1 - Includes five Sussex County landfills with GMZs * - Estimated value K2 - Reported as new sites with ground-water contamination
197 Table IV-7. Statewide summary of known or potential sources of ground-water contamination in Delaware.
Number of Sites that Number of Number of Number of Number with Total Number Number of Sites that are Number of Site have been Stabilized Sites with Sites with sites with Present in Confirmed Ground Contaminants of Source Type of Sites in Listed and/or have Investigations or have had the Corrective Active cleanup State Water Primary Concern State Confirmed Releases (optional) Source Removed Action Plans Remediation completed Contamination (optional) (optional) (optional) (optional)
Total for 2002 Total and 2003
TCE, PCE, Benzene NPL+EPA Removal K1 K2 Yes ------Vinyl Chloride ------
State Sites (non- K1 *,K2 TCE, PCE, PAHs, W1 Yes ------* ------NPL) Metals
DOD/DOE/FUDS Yes -- N1 --K1 -- K2 -- TCE ------
LUST Yes 3140 3140 142 L1 30 L1 Benzene, Petroleum 142 L1 180 L2 163 L3 163 L3 177 L2
R4 Metals, LNAPLs, RCRA Yes 11 11 11 Solvents 11 3 9 1 3
Solid Waste Yes 8 8 6 Landfill Leachate 000----
Underground Nitrates, Coliform, Yes 80 80 14 D2 D3 ------Injection Chloride
Large Septic Nitrates, Coliform, Yes 88 88 20 D2 D3 ------System Chloride
Nitrates, Coliform, Domestic Septic D2 D3 Yes 87,040 87,040 4977 Chloride ------
Nitrates, Coliform, Spray Irrigation D2 D3 Yes 22 22 0 Chloride, Sodium ------
Land Treatment of Food Processing No 6 6 6 S1 D3 Nitrates ------& Grease Trap WasteS1
Sludge Application Yes 17 17 17 S1 D3 Nitrates ------PermitsS1 NPL - National Priority List D1 - Not Broken-down by County -- See State Summary Sheet N1 - One DOD site (Dover AFB) reported as NPL site DOE - Department of Energy D2 - Reported as new permit issuances R1 - Facilities undergoing corrective action DOD - Department of Defense D3 - Permitted ground-water discharges R2 - Sites in facility investigation stage or earlier FUDS - Formerly-Used Defense Sites L1 - Number of sites identified in 1998 and 1999 (subset of total) R3 - post closure permit LUST - Leaking Underground Storage Tanks L2 - Reported as total number of sites that are closed 1998-99 R4 - See county sheets for specific qualifiers RCRA - Resources Conservation and Recovery Act L3 - Reported as total corrective action plans approved 1998-99 S1 - Reported as active permits -- - Data not available or not applicable K1 - Reported as new sites identified in 2000-01 W1 - Includes five Sussex County landfills with GMZs * - Estimated value K2 - Reported as new sites with ground-water contamination
198 State of Delaware 2004 Combined 305(b) Report and 303(d) List
IV.5 Ground-Water-Quality Data from Selected Public Water-Supply Wells For previous 305(b) Ground-Water Assessments, the Delaware Office of Drinking Water database was queried for analytical data for raw (pretreatment) water samples collected from public water-supply wells. The reader is referred to Section IV.5 of the 2002 305(b) Watershed Assessment Report for the most recent analysis of this type. The process described above is cumbersome and yields only very general information about ground-water quality with respect MCLs and SMCLs. Moreover, there is presently no user- friendly means to associate water samples with an individual well and its geographic location, screen setting, and aquifer. As well identification numbers are added to the Delaware Office of Drinking Water database, it will be possible to associate ground-water-quality data with aquifers and geographic location, and more detailed assessments of ground-water quality may be possible. It is envisioned that such analyses will be included in future 305(b) reports.
IV.5.1 Routine Chemical Analyses [Section intentionally left blank; please see section IV.5 for explanation]
IV.5.2 Trace Metals Analyses [Section intentionally left blank; please see section IV.5 for explanation]
IV.5.3 Synthetic Organic Compounds [Section intentionally left blank; please see section IV.5 for explanation]
IV.5.4 Volatile Organic Compounds [Section intentionally left blank; please see section IV.5 for explanation] Table IV-8. Routine chemical and trace metals data for raw ground-water samples collected from public water-supply wells during the reporting period. [Table intentionally not included; please see section IV.5 for explanation] Table IV-9. Volatile and synthetic organic compound (VOC and SOC) data for raw ground- water samples collected from public water-supply wells during the reporting period.
[Table intentionally not included; please see section IV.5 for explanation]
199
State of Delaware 2004 Combined 305(b) Report and 303(d) List
IV.6 Ground-Water Protection Programs Delaware's ground water protection goal is to "ensure sufficient ground water quality for the protection of public health." The DNREC recognizes that protecting public water supplies is an integral part of Delaware's ground water protection goal. Priority is also given to public water supplies through the State's Office of Drinking Water. An indication of the overall ground water quality of the State is presented in the previous (2002) 305(b) Ground-Water Assessment. Since the majority of public water supplies derive their water from ground water, the Office of Drinking Water records provide an indication of the overall quality of Delaware's ground water. Delaware has taken initiatives to minimize the occurrence of contaminants in its public water supplies. Some of the initiatives and programs are briefly discussed. Table IV-10 summarizes the status of regulatory and non-regulatory programs with significant ground-water protection responsibilities. Detailed description of all significant ground water protection programs are found in the Delaware Comprehensive State Ground Water Protection Program (CSGWPP). Delaware’s Wellhead Protection Program (WHPP) was approved by EPA in 1990. Delaware is implementing its WHPP through coordination and cooperation with local governments and agencies such as the University of Delaware Water Resources Agency and the Delaware Rural Water Association. Most elements of the WHPP have been carried out under the Source Water Assessment and Protection Program (SWAPP). Management of contamination sources in Wellhead Protection Areas will occur through existing regulatory programs, zoning ordinances, site plan reviews, operating standards, sources prohibitions, public education, and/or ground water monitoring. Currently the City of Newark and the New Castle County are undertaking several of these activities as part of their Water Resources Protection Area Ordinances. Ordinances have also been adopted in Townsend, Delmar, and Smyrna. Delaware has developed its Source Water Assessment and Protection Program under funding from the SDWA Amendments of 1996. Delaware’s SWAPP was approved by EPA on October 27, 1999. The major activities underway in the SWAPP included (1) delineating all source water areas i.e. wellhead areas for all public supply wells and the watersheds and critical areas upstream of all public drinking water supply intakes (This latter includes Brandywine Creek, Red Clay Creek, White Clay Creek, and Christina River); (2) identifying all potential point and non- point sources of contaminants. (This is being compiled in the DNREC “site index database” (See Table IV-11)); (3) conducting a susceptibility assessment of all public water supply systems; (4) developing a source water protection loan fund; and (5) providing for adequate public availability of all source water susceptibility assessments. The state also passed source water protection legislation that Many of the environmental control programs (e.g. Comprehensive Environmental Response Compensation and Liability Act (CERCLA), Delaware's Hazardous Substance Cleanup Act (HSCA), On-Site Wastewater, UST/Leaking Underground Storage Tanks (LUST)) provide additional protection and/or more priority cleanup requirements in the vicinity of both public and domestic water supplies (ground water and surface water derived) and within major recharge areas. As mapping efforts are completed for the entire State, these protection efforts will become increasingly comprehensive. The recharge mapping effort has been completed and the source water assessment areas for all public water systems are were essentially completed by December
201 2003. These areas will provide a much better basis for prioritizing ground water protection activities. The Non-Point Source Program also addresses sources of contamination in Wellhead Protection Areas and priority watersheds. These efforts include inventorying sources of potential and existing nonpoint sources of contamination, public outreach and education measures to prevent contamination, and by developing best management practices to protect ground and surface water. The Ground Water Protection and the NPS Program cooperate extensively on mitigating activities that affect ground water quality through the State's Comprehensive State Ground Water Protection Plan and Nonpoint Source Management Plan, for example. The Ground Water Protection Program has also assisted the Delaware Department of Agriculture with its Pesticide Management Plan.
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Table IV-10. Summary of ground-water protection programs. Implementation Responsible State Programs or Activities Check (X) Status Agency Active SARA Title III Program X FE DNREC-DAWM Ambient ground water monitoring system X CE DGS, DNREC-WSS, DDA Aquifer vulnerability assessment X CE DNREC-WSS, DGS Aquifer mapping X FE/CE DGS Aquifer characterization X CE DNREC-WSS,DGS Comprehensive data management system X UD DNREC-WSS, DGS EPA-endorsed Core Comprehensive State Ground Water CE DNREC-WSS Protection Program (CSGWPP) X Ground water discharge permits Ground water Best Management Practices X UD/CE DNREC-WSS Ground water legislation Ground water classification Ground water quality standards Interagency coordination for ground water protection UD/CE DNREC-WSS initiatives X Nonpoint source controls X CE DNREC-NPS Pesticide State Management Plan X UD DDA Pollution Prevention Program X CE DNREC Resource Conservation and Recovery Act (RCRA) FE DNREC-RCRA Primacy X State Superfund X FE DNREC-HSCA State RCRA Program incorporating more stringent FE DNREC-RCRA requirements than RCRA primacy X State septic system regulations X FE/UR DNREC-UIC Underground storage tank installation requirements X FE DNREC-TMB Underground Storage Tank Remediation Fund X FE DNREC-TMB Above Ground Storage Tank Program X UD/FE(6/04) DNREC-TMB Underground Storage Tank Permit Program X FE DNREC-TMB Underground Injection Control Program X FE DNREC-UIC Vulnerability assessment for drinking water/wellhead UD DHSS-ODW/DNREC-WSS protection X Well abandonment regulations X FE/UR DNREC-WSS Wellhead Protection Program (EPA-approved) X UD DNREC-WSS Well installation regulations X FE/UR DNREC-WSS Federal CERCLA* X FE DNREC-CERCLA Solid Waste Management * X FE DNREC-SWMA Water Allocation* X FE/CE DNREC-WSS Emergency response* X FE DNREC-ER DNREC - Department Natural Resources and Environmental Control DHSS - Department of Health and Social Services DGS - Delaware Geological Survey CE - Continuing Effort DAWM - Division of Air & Waste Management NPS - Non-Point Source Program FE - Fully Established HSCA - State Hazardous Substance Program ODW - Office of Drinking Water UD - Under Development SWMA - Solid Waste Management Authority CERCLA - Superfund Program UR - Under Review DDA - Delaware Department of Agriculture WSS - Water Supply Section TMB - Tank Management Branch RCRA - RCRA Program ER - Emergency Response Program * - Denotes fields added as "other"
203 Table IV-11. Summary of Potential Point Sources of Contamination identified in Site Index Database as of March 2004. Site Type Count Animal Operations 1445 Combined Sewer Overflows 49 Dredge Spoil Disposal Areas 27 Hazardous Waste Generators 1177 Landfills & Dumps 46 Large On-Site Septic Systems 83 Wastewater Outfalls 172 Pesticide Loading, Mixing & Storage 48 Facilities Salvage Yards 72 Superfund Sites 477 Sludge Application Sites 11 Spray Irrigation Sites 27 Tire Piles 36 Toxics Release Inventory Sites 121 Underground Storage Tanks 3402 Total 7193
IV.6.1 Comprehensive Data Management System Delaware has moved to improved both basic data management and geographic information system data across many programs, including ground-water protection programs. Efforts by DNREC, DDA, DHSS-ODW, DGS and other agencies have moved data systems to better integration and database systems that are related. Programs with point sources are increasingly mapping sites with GPS technology. Other programs such as the drinking water program have begun to enter basic water quality data into a database assessable to agencies outside of that program. Considerable advancement has been demonstrated through the Whole Basin assessments as demonstrated by progress in completing the site index database for the entire state (see Table IV-11). As a result of the efforts stemming from whole basin assessments, the Department has moved to greatly increase the accessibility and quality of environmental information. Termed the Environmental Information System, programs which regulate, for instance, facilities that could contaminate ground water will be “live” linked to a single database.
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IV.6.2 Pesticide Management Program The Delaware DDA and DNREC completed the recently approved Delaware Pesticide Management Plan. This plan describes Delaware’s approach to managing the use of pesticides which have a potential for contaminating ground water. Once regulations are promulgated by the U.S. EPA, Delaware is prepared to begin development of pesticide-specific management plans. As part of the Pesticide program, the DDA developed a statewide ambient ground-water monitoring network which includes approximately 136 monitoring, domestic, and agricultural wells. These wells are routinely sampled and tested for pesticides that are included in the PMP. The results of the first years of this study are included in a report published by the DGS (Blaier and Baxter, 2000). Key findings of Blaier and Baxter (2000) are discussed briefly in Section IV.4.9 of this 305(b) report.
IV.6.3 Source Water Assessment and Protection Program The Delaware Source Water Assessment and Protection Program (SWAPP) is responsible for a number of key activities associated with the assessment and protection of the sources of public drinking water. The key activities, as described in the Delaware Source Water Assessment Plan (DNREC, 1999), include the (1) delineation of the source water areas for public water supplies for both surface- and ground-water systems, (2) identification of sources of contamination within the delineated area, (3) preparation of a susceptibility assessment report for each of the over 500 pubic water systems in Delaware, (4) assuring the involvement of the public in both the SWAPP approach in Delaware and in receipt of the source water assessments for their public water purveyor, (5) development of protection measures for sources of public water, and (6) management of a source water protection loan fund. Begun in 1999, the Delaware SWAPP has worked to address each of the key activities, with some statutory deadlines set by the 1996 amendments to the Safe Drinking Water Act. Both wellhead protection area and watershed basin delineations are being completed. The surface water system assessments are all located in New Castle County within the Christina River Basin with the watersheds for the Brandywine River, Red Clay Creek, White Clay Creek, and Smalley’s Pond. All of these watersheds extend into adjacent states of Pennsylvania and Maryland. These assessments were largely completed during the previous reporting period with the final reports completed in March 2002. The wellhead protection area delineations for the remaining 510 public water supply systems are being completed in earnest with 350 systems completed. The remaining 160 systems are scheduled to be completed in early 2004. The highest priority is being given to the community systems, followed by the non-transient and transient systems. The Department has developed a sophisticated computer based approach which uses WhAEM models, Arcview GIS, standard databases, and integrated work document processing to prepare the assessment reports and the associated maps. This approach allows the state to readily update their assessments. The contaminant inventory is based on extensive GIS data now available for both point (discrete) sources and land use. This information is compiled automatically using the DNREC-GIS to identify the potential contaminant problems within source water areas. The DNREC Site Index Database catalogues the ground water and surface water pollution rankings for the point source sites (e.g. UST, landfills, septic systems, etc) and the 1997 aerial land use maps. In addition, the
205 DHSS Office of Drinking Water analytical database is queried to assemble data for raw water sampling. The susceptibility assessment reports compile all of the previously mentioned data and rate the source water susceptibility as to it’s relative susceptibility based on the intrinsic vulnerability of the system (which is a determination of the relative ease with which contaminants could enter the well or intake) versus the severity of contaminant sources within the source water area. Information on the types of discrete potential sources of contamination and major land uses is being compiled in the SWP database. As of December 2003, with most assessments complete, the five major land uses are residential (7,550 acres) and cropland (6,872 acres), followed by commercial, combined urban, and forested and much less acreage. The relative amounts did differ between the three counties depending of the population and major industries. The transient and non-transient, as a group, had more recreational land. Similar information is available for discrete sources of contamination with 314 underground storage tank sites, 100 hazardous waste generators, 47 uncontrolled waste sites, 9 large wastewater disposal systems, 5 animal feedlot operations, and numerous domestic septic systems. Source water assessments are made available on the SWAPP web site at www.wr.udel.edu/swap/swp1.html, from the DNREC Division of Water Resources, or from the water system purveyor. There are some limitations placed on the availability of the assessment maps, however. IV.6.4 Whole Basin Management DNREC has developed a schedule for Whole Basin Management for each of Delaware’s four defined basins- Piedmont, Chesapeake, Inland Bays/Atlantic, and Delaware River. The initial step in the whole basin management approach is a preliminary assessment at all natural resources and problems, including surface water and ground-water resources. The Preliminary Assessments for the Piedmont Basin (DNREC, 1997), Chesapeake Basin (DNREC, 2001a), and Inland Bays/Atlantic Ocean Basin (DNREC, 2001b) have been completed. The information on ground water for these basin was included in previous 305 (b) reports. The Delaware River Basin preliminary assessment began in 1999 and is not yet final.
IV.7 References Andres, A. Scott, 1986, Geohydrology of the northern coastal area, Delaware: Delaware Geological Survey Hydrologic Map Series No. 5, Sheet 1 – Basic Geohydrologic Data, scale 1:24,000. _____, 1987a, Geohydrology of the northern coastal area, Delaware: Delaware Geological Survey Hydrologic Map Series No. 5, Sheet 2 – Geohydrology of the Columbia aquifer, scale 1:24,000. _____, 1987b, Estimate of direct discharge of fresh ground water to Rehoboth and Indian River Bays: Delaware Geological Survey Report of Investigations No. 43, 37 p. _____, 1991, Methodology for mapping ground-water recharge areas in Delaware’s Coastal Plain: Delaware Geological Survey Open File Report No. 34, 18 p. _____, 1992, Estimate of nitrate flux to Rehoboth and Indian River Bays, Delaware, through the direct discharge of ground water: Delaware Geological Survey Open File Report No. 35, 36 p.
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_____, 1994, Geohydrology of the Seaford area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 9, scale 1:24,000. _____, 2001, Geohydrology of the Smyrna-Clayton area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 10, scale 1:24,000. _____, 2003a, Ground-Water Recharge Potential, Kent County, Delaware: Delaware Geological Survey Hydrologic Map No. 11. _____, 2003b, Ground-Water Recharge Potential, Sussex County, Delaware: Delaware Geological Survey Hydrologic Map No. 12. Bachman, Joseph L., and Ferrari, Matthew J., 1995, Quality and geochemistry of ground water in southern New Castle County, Delaware: Delaware Geological Survey Report of Investigations No. 52, 31 p. Baxter, Stefanie J., and Talley, John H., 1997, Design, development, and implementation of a ground-water quality monitoring network for southern New Castle County, Delaware – Phase IV – continued implementation – results of second, third, and fourth quarters of year 1: Delaware Geological Survey, unpublished report, 55 p. Blaier, Scott C., and Baxter, Stefanie J., 2000, The occurrence and distribution of several agricultural pesticides in Delaware’s shallow ground water: Delaware Geological Survey Report of Investigations No. 61, 23 p. Butoryak, Kathleen R., and Talley, John H., 1993, Delineation of ground-water recharge resource protection areas in the Coastal Plain of New Castle County, Delaware: Delaware Geological Survey, 26 p., with plates. DNREC, 1997, Piedmont Basin Preliminary Assessment Report: Delaware Department of Natural Resources and Environmental Control Document No. 40-01/97/07/03, 203 p., 34 maps. DNREC, 2001a, Assessment Report of Delaware’s Chesapeake Basin: Delaware Department of Natural Resources and Environmental Control Document No. 40-01/00/11/02, 150 p., 39 maps. DNREC, 2001b, Inland Bays/Atlantic Ocean Basin Assessment Report: Delaware Department of Natural Resources and Environmental Control Document No. 40-01/01/01/02, 180 p., 35 maps. Facozio, Michael J., Szabo, Zoltan, Kraemer, Thomas F., Mullin, Ann H., Barringer, Thomas H., and DePaul, Vincent T., 2000, Occurrence of selected radionuclides in ground water used for drinking water in the United States – A reconnaissance survey, 1998: U.S. Geological Survey Water-Resources Investigations Report 00-4273, 40 p. Ferrari, Matthew J., 2001, Occurrence and distribution of selected contaminants in public drinking-water supplies in the surficial aquifer in Delaware: U.S. Geological Survey Open-File Report 01-327, 62 p. Johnston, Richard H., 1976, Relation of ground water to surface water in four small basins of the Delaware Coastal Plain: Delaware Geological Survey Report of Investigations No. 24, 56 p. Pickett, Thomas E., 1976, Generalized Geologic Map of Delaware (revised): Delaware Geological Survey Special Publication No. 9, scale 1:576,000. Plank, Margaret O., Schenck, William S., and Srogi, LeeAnn, 2000, Bedrock geology of the
207 Piedmont of Delaware and adjacent Pennsylvania: Delaware Geological Survey Report of Investigations No. 59, 52 p. Schenck, William S., Plank, Margaret O., and Srogi, LeeAnn, 2000, Bedrock geologic map of the Piedmont of Delaware and adjacent Pennsylvania: Delaware Geological Survey Geologic Map Series No. 10, scale 1:36,000. Solley, Wayne B., Pierce, Robert R., and Perlman, Howard A., 1993, Estimated use of water in the United States in 1990: U.S. Geological Survey Circular 1081. Solley, Wayne B., Pierce, Robert R., and Perlman, Howard A., 1998, Estimated use of water in the United States in 1995: U.S. Geological Survey Circular 1200, 71 p. Talley, John H., 1982, Geohydrology of the Milford area, Delaware: Delaware Geological Survey Hydrologic Map Series No. 4, scale 1:24,000. _____, 1987, Geohydrology of the southern coastal area, Delaware: Delaware Geological Survey Hydrologic Map Series No. 7, Sheet 1 – Basic Geohydrologic Data, scale 1:24,000. _____, 1988, Geohydrology of the southern coastal area, Delaware: Delaware Geological Survey Hydrologic Map Series No. 7, Sheet 2 – Geohydrology of the Columbia aquifer, scale 1:24,000. _____, 2003, Ground-water monitoring of coastal aquifers, Sussex County, Delaware: Delaware Geological Survey, unpublished report. Talley, John H., and Baxter, Stefanie J., 2001, Summary of water conditions in Delaware, water year 2001, October 1, 2000 – September 30, 2001: Delaware Geological Survey, 3 p. _____, 2002a, Summary of water conditions in Delaware, water year 2002, October and November 2001: Delaware Geological Survey, 3 p. _____, 2002b, Summary of water conditions in Delaware, water year 2002, December 2001 and January 2002: Delaware Geological Survey, 3 p. Talley, John H., and Bounds, Roland E., 2002, Ground-water monitoring of coastal aquifers, Sussex County, Delaware: Delaware Geological Survey, unpublished report. Vogel, Karen L., and Reif, Andrew G., 1993, Geohydrology and simulation of ground-water flow in the Red Clay Creek basin, Chester County, Pennsylvania, and New Castle County, Delaware: U.S. Geological Survey Water-Resources Investigations Report 93-4055, 111 p., 2 plates. Werkheiser, William H., 1995, Geohydrology of the Hockessin area with emphasis on the Cockeysville aquifer, in Talley, John H., ed., Geology and Hydrology of the Cockeysville Formation, northern New Castle County, Delaware: Delaware Geological Survey Bulletin No. 9, p. 26-59. Wheeler, Judith C., 1999, Freshwater use in Delaware, 1995: U.S. Geological Survey Fact Sheet 126-99. Woodruff, Kenneth D., 1972, Geohydrology of the Dover area, Delaware: Delaware Geological Survey Hydrologic Map Series No. 1, scale 1:24,000. _____, 1977, Geohydrology of the Newark area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 2, Sheet 1- Basic Geology, scale 1:24,000.
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_____, 1978, Geohydrology of the Newark area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 2, Sheet 2- Hydrologic Geology, scale 1:24,000. _____, 1981, Geohydrology of the Wilmington area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 3, Sheet 1- Basic Geology, scale 1:24,000. _____, 1984a, Geohydrology of the Wilmington area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 3, Sheet 2- Hydrologic Data, scale 1:24,000. _____, 1984b, Geohydrology of the Wilmington area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 3, Sheet 3- Structural Geology, scale 1:24,000. _____, 1985, Geohydrology of the Wilmington area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 3, Sheet 4- Structural Geology, scale 1:24,000. _____, 1986, Geohydrology of the Chesapeake and Delaware Canal area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 6, Sheet 1- Basic Geology, scale 1:24,000. _____, 1988, Geohydrology of the Chesapeake and Delaware Canal area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 6, Sheet 2 – Thickness of the confining unit beneath the water-table aquifer, scale 1:24,000.
_____, 1990, Geohydrology of the Middletown-Odessa area, Delaware. Delaware Geological Survey Hydrologic Map Series No. 8, Sheet 1- Basic Geology and Hydrology, scale 1:24,000. Woodruff, Kenneth D., and Plank, Margaret O., 1995, Geology of the Cockeysville Formation, in Talley, John H., ed., Geology and Hydrology of the Cockeysville Formation, northern New Castle County, Delaware: Delaware Geological Survey Bulletin No. 9, p. 4-25, 1 plate.
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Part V: Wetlands Assessment
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Part V: Wetlands Assessment
Introduction Wetlands comprise a significant portion of the water resources of Delaware covering over 300,000 acres of the state. Throughout the state a wide diversity of wetland types occur including both tidal and nontidal wetlands. While some wetlands are directly connected or adjacent to other surface waters such as salt marshes and floodplains, others occur as isolated areas surrounded by uplands such as forested flats and Delmarva Bays. Preserving the abundance, quality, diversity and proportion of different types of wetlands in the landscape is essential to protecting the natural resources and waters of Delaware. Currently the State of Delaware is actively working in each of these areas to protect our high quality wetland resources and restore degraded systems on the watershed scale.
Functions and Values of Wetlands Wetlands perform a variety of functions including surface and subsurface water exchange, surface and subsurface water storage, sediment retention, nutrient cycling, organic carbon export, providing faunal and flora habitat, maintaining intact food webs, and maintaining interspersion and connectivity in the landscape. Because wetlands are diverse and occur in a variety different ecosystems, they do not all perform the same functions therefore, it is generally difficult to determine a wetland’s function without a specific site analysis. Variables to consider in assessing wetland function include: wetland type, landscape position, vegetation, soils, hydrology, size, adjacent land use, and human disturbance. In contrast to function, wetland value is determined by the usefulness of the wetland and the functions it is performing to humans. According to Wohlgemuth (1991), wetlands offer three broad categories of values: fish and wildlife habitat values, environmental quality values and socioeconomic values. The location of the wetland, human pressures on it, or the size of the wetland may indicate the value of a functional ecological process (Mitch and Gosselink, 1986). For example, clean water associated with wetlands provides drinking water to upland species, and provides an uncontaminated environment necessary for many fish species, and ultimately, recreational value in the form of hunting and fishing for humans. Because wetland values are determined by their benefit to humans, a wetland in one locality may be more highly valued than a wetland performing the same function in another locality.
Fish and Wildlife Habitat Wetlands provide food and habitat for a variety of terrestrial and aquatic species including fish, birds, mammals, amphibians, reptiles, and invertebrates. Some of these animals are either fully or partially dependent on wetlands to complete their lifecycles. Most Commercially important fish species, for example, are wholly dependent on wetlands for spawning and nursery areas. Wetlands also provide breeding, feeding, and nesting habitats for a variety of waterfowl species and furbearers. Some species of frogs, toads, and salamanders depend on wetland habitat for their survival, and provide food for animals in higher trophic levels. Reptiles, such as turtles and
213 snakes, use these areas for the same reasons as the above. Invertebrates such as aquatic insects are important in the maintenance of the food web.
Environmental Quality Benefits Wetlands are considered among the most productive ecosystems in the world. Wetland plants produce more plant material than most very productive cultivated farm fields. Wetland plant communities sustain a high diversity of plant species including a large number of rare and threatened species in Delaware. Additionally, when the plants die and are broken down into detritus by bacteria and other microorganisms, they form the base of the food web that supports higher animals such as commercial fish species. Wetlands also help maintain and improve water quality. The following are specific environmental quality benefits of wetlands: Pollutant removal (heavy metals, pathogens) Sediment trapping Nutrient uptake and recycling Oxygen production Socioeconomic Values Some of the functions that wetlands perform are economically valuable, such as protection from flood and storm damage. Because these benefits provide dollar savings, they tend to be more appreciated. The following are some socioeconomic wetland values: Flood and storm water damage protection Erosion control Water supply and ground water recharge Natural products supply (e.g., timber, fish, wildlife, firewood… etc.) Recreation (e.g., waterfowl, fishing, boating, nature study… etc.)
Wetland Quantity Estimates of wetland acreages have changed as more technologically refined techniques have been developed over the last couple of years. Until the advent of this higher resolution color aerial infrared photography, it was found that much of the wetland land base was underestimated. In fact, previous estimates by Tiner (1985) assessed 221,800 total acres of tidal and nontidal wetlands in Delaware, while a recent estimate by the same author realized a more refined estimate of 353,868 (Tiner 2002). The higher figure reported in the latter estimate can, however, be attributed in part to the inclusion of 29,000 acres of nontidal agricultural wetlands that were intentionally omitted in the previous assessment effort (See table 1). Table V-1. Current tidal and nontidal Delaware wetland acreage estimates (Tiner 2002).
Tidal wetlands 127,338
214 State of Delaware 2004 Combined 305(b) Report and 303(d) List
Nontidal wetlands* 226,530
Total wetland acreage 353,868
* Includes 29,000 acres of nontidal agricultural wetlands
I.2.1 The Statewide Wetland Mapping Project (SWMP) and Wetland Trends in Delaware (1981/2-1992) In an attempt to improve existing wetland inventories, the State Wetlands Mapping Project (SWMP) was conceived as a collaborative effort between the Delaware Department of Natural Resources (DNREC), Delaware Department of Transportation (DELDOT), and the United States Fish and Wildlife Service (USFWS; Pomato 1994). Utilizing aerial color digital orthophotography, the SWMP maps (derived from same named project), employ a modified Cowardin et. al. (1979) hierarchical classification scheme for classifying Delaware’s wetlands. These aerial color photographs provide higher level resolution “wetland signatures” than the older monochromatic National Wetlands Inventory (NWI) maps, which increases the precision and accuracy of wetland delineation, identification of vegetative types (e.g., broad-leaved deciduous, broad-leaved evergreen…etc), and the identification of hydrologic regimes (e.g., A, B, C…etc.). Utilizing color infrared aerial photography for the decade-long time period (1981/2-1992), the service assessed statewide wetland losses, gains, and changes in wetland type by photo interpretation of “wetland signatures.” Wetland trends were also assessed separately in the following four drainage basins: 1) Northern Piedmont, 2) Delaware Bay, 3) Chesapeake Bay and, 4) Inland Bays.
Statewide Wetland Losses (1981/2-1992) Approximately 2000 acres of vegetated wetlands were destroyed from 1981/2 to 1992 time period. Most of the wetland losses were palustrine vegetated wetlands (1890 acres), while estuarine wetlands losses were minor. (106 acres; Tiner et al. 1999). Agricultural activities had the greatest impact on Palustrine wetland losses (954 acres). Residential activities also destroyed significant amounts of wetlands (436 acres). The remaining wetland losses were derived from pond and road construction practices, with each being responsible for 7 percent of the losses. Palustrine vegetated wetlands accounted for 95 percent of all wetland losses in Delaware. Palustrine forested wetlands experienced the bulk of losses of all palustrine vegetated types (1505 acres; Tiner et al. 1999). Most of the losses to estuarine wetlands were due to saltwater impoundments (52.2 acres). Filling in wetlands also accounted for some significant acreage losses (32.7acres). Highway road projects and residential development accounted for the balance of estuarine wetland losses (11 acres; Tiner et al. 1999).
Northern Piedmont Drainage Wetland Losses The Northern Piedmont drainage is the smallest and most urbanized drainage basin in the state. About 9 percent of the state’s land area fall within this drainage basin, which contains approximately 3.2 percent of the state’s wetlands.
215 During this decade-long study period (1981/2-1992), palustrine vegetated wetlands experienced the greatest losses. These wetland s declined by 137.8 net acres. Of all palustrine vegetated types, palustrine forested wetlands experienced the greatest losses, with about 110 acres or 75 percent of total palustrine vegetated wetland being converted to uplands. Residential and Industrial development were the leading causes attributed to their destruction of 70 percent and 18 percent, respectively. (Tiner et al. 1999). Estuarine wetlands were not subject to the same degree of destruction as palustrine wetlands during the decade long study period. Approximately 1 acre of wetlands was destroyed by conversion to industrial development, or impounded estuarine deepwater habitat (Tiner et al. 1999).
Delaware Bay Drainage Wetland Losses The Delaware Bay Drainage is the largest drainage in Delaware. About 41 percent of the state’s land area fall within this drainage basin, which also contains approximately 34 percent of the state’s wetlands. From 1981/2-1992, palustrine vegetated wetlands experienced the greatest losses (679.2 acres), though estuarine wetlands experienced lesser, though not insignificant losses (78.4 acres; Tiner et al. 1999). The primary agent in palustrine vegetated wetland destruction was residential development, accounting for about 35 percent of the losses. Agriculture and Highway road construction accounted for the remainder of the losses – about 28 percent and 10 percent, respectively (Tiner et al. 1999). From 1981/2-1992, estuarine wetlands experienced net losses only second to palustrine vegetated wetlands (78.4 acres). The primary cause of their losses was conversion to estuarine open water impoundments and dredged channels (36.8 acres), miscellaneous filling practices (37.4 acres; Tiner et al. 1999).
Chesapeake Bay Drainage The Chesapeake Bay drainage is the second largest drainage in Delaware (approximately 32 percent), and contains the greatest percentage of wetlands (approximately 54 percent) of the four drainages. Palustrine vegetated wetlands are the predominant wetland system type found in this basin. About 712 acres of palustrine vegetated wetlands, or 84 percent of these wetlands, were lost due to agricultural expansion during the 1981/2-1992 study period. Significant acreages of estuarine vegetated wetlands are not found in this basin (Tiner et al. 1999). Most of the palustrine vegetated wetland losses were palustrine forested wetlands. Approximately 701 acres of these wetlands were destroyed during the 1981/2-1992 study period. Agricultural operations were responsible for 82 percent of the losses of this wetland type (Tiner et al. 1999).
Inland Bays Drainage The Inland Bays Drainage is comprised of three coastal bays: Indian River Bay, Rehoboth Bay, and Little Assawoman Bay. This drainage comprises about 18 percent of Delaware’s surface land area and contains both Palustrine and Estuarine wetlands. Consistent with the other three drainages, Palustrine vegetated wetlands experienced the greatest losses (Tiner et al. 1999).
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A loss of 271.3 acres of palustrine vegetated wetlands were recorded during the 1981/2-1992 time period, of which forty-eight percent were directly attributed to agricultural operations. The remainder of the losses were agricultural and residential – about 20 percent and 24 percent, respectively (Tiner et al. 1999). Forested wetlands bore the brunt of these losses. About 254.3 acres of forested wetlands were lost during the 1980s, which represents 90 percent of the drainage’s palustrine vegetated wetland base. Palustrine deciduous forests experienced the greatest losses, with 178.4 acres converted to uplands or 70 percent of the palustrine forested wetland base. Agricultural activities were responsible for 38 percent of the total losses. Residential development and pond construction accounted for remaining wetland losses, 33 percent and 26, respectively (Tiner et al. 1999).
Wetland Quality In addition to evaluating the quantity of wetlands in the state and working towards protection of these areas, the State of Delaware is developing techniques to begin assessing the condition of our wetland resources. Beginning in 1999 we have been working with The Smithsonian Environmental Research Center and The Nature Conservancy in the Nanticoke River watershed to develop hydrogeomorphic models that will evaluate how non-tidal wetlands throughout the watershed are performing various functions compared to reference sites. This study will provide information on the overall condition of wetlands in the watershed and identify the major stressors that are affecting wetland functions. Currently we are completing this work and compiling the information with the goal of producing a strategy for wetland protection and restoration for the watershed that will improve wetland quality on the watershed level.
Wetlands and Total Maximum Daily Load (TMDL) Regulations As noted above, wetlands processes can be important in the removal and mitigation of excessive sediment, nutrients, and other pollutants. These pollutants have a direct bearing on the quality of water in the receiving waterbody. Delaware has recently enacted TMDL regulations to improve water quality in waterbodies that are not meeting their designated uses. The Department believes active preservation and restoration of high quality wetlands will be important components of a successful TMDL implementation process.
References Mitsch, W.J. and J.G. Gosselink. 1986. Wetlands. Van Nostrand Reinhold Co., New York, NY. 329 pp. Pomato, L.T. 1994. Statewide Wetland Mapping Project (SWMP). Prepared for the State of Delaware’s Department of Natural Resource and Environmental Control (DNREC) and for the Delaware Department of Transportation (DELDOT). Tiner, R.J. 2002. Delaware Wetlands Status and Trends. In Press. Tiner, R., J. Swords and S. Schaller 1999. Wetland Trends in Delaware 1981/2 to 1992. U.S. Fish and Wildlife Service, National Wetlands Inventory, Hadley, MA and Delaware Department of Natural Resources and Environmental Control, Watershed Assessment Section, Dover, DE. Cooperative Publication. 46pp.
217 Wohlgemuth, M., 1991. Non-tidal Wetland Functions and Values. Technical Report No. 91-A. 12 pp.
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Appendices
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Appendix A: Citizens Monitoring Data Summary Statistics
Delaware Inland Bays Citizen Monitoring Program Summary Nutrient, Chlorophyll a and Suspended Solids Statistics
# TSS Average Max TSS #chl a Average chl Max chl a # DIP Average Max DIP # DIN Average Max DIN Location Samples TSS (mg/l) (mg/l) Samples a (ug/l) (ug/l) Samples DIP (mg/l) (mg/l) Samples DIN (mg/l) (mg/l) Ag. Ditch (Roxana) 47 6.6 40.3 47 4.3 31.0 47 0.022 0.414 47 1.9 4.7 Bay Colony 87 30.7 200.8 89 12.0 45.2 67 0.026 0.116 67 0.5 2.2 Big Ditch Point, Pot Nets Indian Landing 68 55.9 191.3 68 14.3 547.2 43 0.018 0.045 43 0.1 0.2 Burton Prong 99 30.3 198.4 100 18.5 65.6 76 0.006 0.018 76 0.4 2.0 Burtons Pond Spillway 10 0.3 1.5 10 2.6 7.5 10 0.007 0.013 10 0.7 1.7 Dirickson Creek at Road 381 bridge. 90 37.7 238.0 90 72.0 715.3 72 0.040 0.278 72 1.2 6.2 Fenwick-Lighthouse Cove 8 12.5 17.2 8 13.6 25.4 8 0.014 0.044 8 0.2 0.4 Guinea Creek (Winding Creek 102 23.8 199.0 102 19.2 92.2 77 0.007 0.087 77 0.9 3.8 Guinea Creek @ Rd 298 Bridge 105 16.3 198.0 104 17.4 108.9 80 0.010 0.057 80 2.1 5.0 Gull Point 88 30.3 117.6 89 24.0 111.2 79 0.044 0.426 79 0.6 2.3 Herring Creek, Mid-Section 135 26.8 143.7 136 22.5 112.8 110 0.015 1.057 110 0.4 1.7 Holly Terrace Acres Canal 40 59.8 1354.0 40 65.4 1040.0 16 0.006 0.011 16 0.5 2.0 Keenwick on Bay, Roy Creek 65 38.9 90.3 65 18.8 44.2 40 0.006 0.023 40 0.1 0.4 Lewes-Rehoboth Canal - Lewes 10 28.1 67.4 10 18.0 76.9 10 0.055 0.122 10 0.4 1.0 Lewes-Rehoboth Canal - Rehoboth 84 48.2 152.1 85 12.1 48.8 60 0.043 0.223 60 0.4 1.2 Love Creek at Rt 24 Bridge 105 28.5 97.4 104 56.2 743.8 81 0.010 0.053 81 0.5 2.2 Massey's Landing 90 55.0 230.8 91 8.3 33.4 66 0.017 0.051 66 0.1 0.4 Millsboro Pond-Rt 30 Boat Launch 10 1.5 5.3 10 8.2 27.3 10 0.008 0.016 10 2.9 3.7 Mouth of Arnell Creek/Mouth of Love Creek 91 42.0 176.0 90 13.8 62.8 75 0.019 0.116 75 0.2 1.3 Mouth of Guinea Creek (Pot Nets Creekside) 105 37.0 185.5 104 15.9 50.0 81 0.006 0.019 81 0.2 0.7 Mulberry Landing 104 34.4 175.2 105 24.1 71.8 80 0.006 0.023 80 0.1 1.6 Steele Cove, Pot Nets Indian Landing 37 16.5 99.7 36 9.1 26.6 37 0.010 0.041 37 0.1 0.7 Vine Creek at Rt 26 20 43.0 114.0 20 67.4 316.0 20 0.020 0.108 20 0.8 2.9 Warwick Cove 16 56.4 113.9 16 22.8 70.6 West Bay Park 98 20.1 139.4 98 11.6 108.6 74 0.023 0.075 74 0.1 0.4 Delaware Citizen Monitoring Program Summary Dissolved Oxygen Statistics
# DO Average Min DO Location Samples DO (mg/L) (mg/L) Anchorage Canal, South Bethany 102 6.8 3.8 Assawoman Canal @ Kent Ave Bridge 96 5.5 2.2 Bay Colony 138 6.0 2.2 Bethany Marina 9 7.7 5.2 Big Ditch Point, Pot Nets Indian Landing 92 6.7 1.4 Broken marshes, 1/4 mile SE of Quillens 53 8.0 4.0 Point Burton Prong 152 6.1 1.8 Camp Arrowhead(camp pier) 30 7.9 5.0 Dirickson Creek at Road 381 bridge. 73 5.5 0.0 Guinea Creek (Winding Creek Village) 110 6.8 3.6 Gull Point 78 6.6 3.2 Head of Bay Cove-Canal-Venetian Drive 81 10.6 4.5 Head of Bay Cove-Canal-Venetian Drive- 100m from RB42 6 9.5 7.8 Herring Creek, Mid-Section 167 7.3 2.3 Holly Terrace Acres Canal 23 5.7 1.5 Holt's Landing State Park 61 8.1 2.3 Joy Beach 12 6.2 2.4 Keenwick on Bay, Roy Creek 20 5.8 2.3 Keenwick Sound, entrance to canal system 9 4.2 2.6 Lewes - Rehoboth Canal at Lewes 80 6.3 3.4 Lewes-Rehoboth Canal - Rehoboth 100 6.0 2.0 Lighthouse Cove, Fenwick 14 4.4 2.6 Love Creek at Rt 24 Bridge 134 6.5 2.6 Massey's Landing 9 6.7 4.7 Mouth of Arnell Creek/Mount of Love Creek 122 6.0 2.0 Mouth of Arnell Creek-Lagoon (100m NE 5 2.6 0.7 of RB01) Mouth of Guinea Creek (Pot Nets 149 6.5 3.0 Creekside) Mulberry Knoll, Love Creek 111 5.9 1.8 Mulberry Landing 149 7.2 3.5 Pelican Cove, Dewey 12 6.6 4.8 Steele Cove, Pot Nets Indian Landing 51 7.5 2.6 Warwick Cove 135 8.3 3.3 West Bay Park 163 7.1 2.1 White Creek 90 6.3 3.3 White House Beach 38 8.0 4.2 Appendix B: Comments and Responses to the Tentative Determination for the State of Delaware 2004 Clean Water Act Section 303(d) List of Waters Needing TMDLs.
Comments and Response to Comments on Delaware’s Tentative Determination for the 2004 Clean Water Act Section 303(d) List of Waters Needing TMDLs This Response to Comments document consists of comments made from September 1, 2004 through October 15, 2004 and Departmental responses to the Department’s Tentative Determination for the 2004 Section 303(d) List. A section has been created for each commenter. Where practical, the exact text of each comment has been used.. Comments are listed in the order that they were received. Commenter information is in bold at the head of each section, the comments are in italics and Departmental responses are in regular text.
Commenter: Robert Whetzel Affiliation: Richards Layton & Finger on behalf of Kent County Levy Court (Editors Note: Mr. Whetzel’s comments on behalf of the County totaled 25 pages and included several hundred pages of supporting documents. They were summarized within the comment, by the commenter. The summary statements are repeated below.)
1. DNREC has not promulgated the Tentative 303(d) List, which constitutes a regulation, in accordance with Delaware law; The 303(d) List is not a regulation. As noted in the public notice of the availability of the Tentative List: “Section 303(d) of the Federal Clean Water Act and implementing regulations (40 CFR 130.7) require each state to identify and prioritize water quality limited segments still requiring Waste Load Allocations/Load Allocations (WLAs/Las) and Total Maximum Daily Loads (TMDLs) within its boundaries. A water quality limited segment is a waterbody or portion of a waterbody (e.g., a length of river, an area of an estuary, a pond or wetland, etc.) in which water quality does not meet applicable water quality standards, and/or is not expected to meet applicable water quality standards, even after the application of technology-based effluent limitations required by sections 301(b) and 306 of the Clean Water Act. A TMDL specifies the maximum allowable loading of a pollutant or thermal energy to a waterbody and allocates that loading or thermal energy to contributing point and nonpoint sources such that water quality standards can be attained.“ The commenter’s comments note that “Section 303(d) of the CWA requires the periodic identification and listing by the State of waters for which effluent limitations on pollutant discharge required by section 1311(b)(1) of the CWA “are not stringent enough to implement any water quality standard applicable to such waters.” The list is used to delineate the waters for which TMDLs are required. The TMDLs are subject to applicable Delaware Laws and implementing regulations. In order to more fully inform the public of conditions existing in surface waters of the State, when a TMDL has been established, the waters are put into Category 4a until all applicable criteria are met. Then those waters are put into Category 1. The Department advertises the Tentative List and asks for comments as one way to ensure that stakeholders have a say in which waters are listed and have TMDLs developed to meet the Clean Water Act goals of restoring the physical, chemical and biological integrity of the waters. 2. The Clean Water Act does not contemplate the listing of a water segment such as the lower Murderkill River where water quality reflects natural conditions;
It has not been demonstrated that natural conditions are responsible for impaired water quality in the segments. If such a demonstration is made, future lists will reflect those findings.
3. The lower Murderkill River should not be listed for nutrients because DNREC (a). has not demonstrated the failure of the segment to meet the narrative water quality standard
(b). appears to be utilizing unapproved numerical standards in its determination of attainment, (c). has not adequately described its methodology or the data and information used in its analysis, and (d). utilizes “targets” and “guidelines” not appropriate for the lower Murderkill River; Section 7 of the State Standards provides narrative criteria to minimize the impact of nutrient input to the surface waters from point and human-induced nonpoint sources. For the past several 303(d) lists, the Department has used average levels greater than 1.0 mg/l for total nitrogen and 0.1 mg/l for total phosphorous as indicators of nutrient impairment based on literature values and best professional judgment. The appropriateness of these nutrient levels was recently documented by a study conducted for DNREC and the U.S. Environmental Protection Agency (EPA) Region 3 by Kent S. Price, Ph.D. The study, “Data Analysis for the Development of Nutrient Criteria for Estuaries in Delaware, Kent S. Price, June 12, 2001,” was carried out to assist the State in the establishment of nutrient criteria for estuaries and tidal rivers. By applying EPA’s methodology for establishing nutrient criteria, the study concluded that for Delaware tidal rivers, the nutrient criteria should be approximately 1.73 mg/l for total nitrogen and 0.09 mg/l for total phosphorous. The lower confidence limits (LCL) for the 90th percentile of total nitrogen data was reported between 1.8 and 4.3 mg/l for the lower Murderkill stations. For phosphorous the 90th percentile LCLs ranged from 0.3 to 0.6 mg/l. Median values were not reported in the assessment, but median values for total nitrogen ranged from 1.3 to 2.5 mg/l and median total phosphorous ranged from 0.23 to 0.36 mg/l during the period of interest. As noted in the response to comments on the methodology (see appendix), nutrient levels in the Murderkill system appear to be much higher now than in the past.
4. The lower Murderkill River should not be listed for dissolved oxygen, because DNREC (a). fails to identify the standard used to determine attainment (b). has not demonstrated that the water segment does not attain water quality standards for DO, (c). has not applied the water quality standard for DO correctly, and (d). has not examined all available data; The applicable standards were shown in the Methodology document. Results of upper confidence limit analyses were shown on a station by station basis. Stations in the lower Murderkill showed upper confidence of the 10th percentile ranging between 1.9 and 4.6 mg/l, well below either the marine standard of 5.0 mg/l or the freshwater 5.5 mg/l criteria. All readily available data was used for the determination. The commenter notes that continuous monitoring data may have been available, and was not considered. Two projects have been undertaken in the Murderkill using continuous monitors. One project used continuous monitors at four stations during 2001. The second project is part of a pilot project to continuously monitor some waters of the State for dissolved oxygen and other parameters. As part of the pilot project, the Lower Murderkill has had a continuous monitor at one location at various times from 2001-2003. As part of the 305(b) assessment process the Department evaluated the data from both projects and found the data suitable for use in scientific studies, but determined the data to be inappropriate for assessment purposes. This comment prompted the Department to evaluate the data with the
results in the following table. The Department believes that the continuous data supports the same conclusions reached using grab sample data.
# # # UCL samples Summer summer 1st Station #samples less Daily means %tile, than 4 Means <5 all data 206091 (2001 Project) 8247 2688 109 85 1.89 206101 (2001 Project) 8259 373 109 7 3.09 206141 (2001 Project) 8294 3031 109 96 1.61 206231 (2001 Project) 8272 2834 104 93 1.93
Continuous Monitoring 2001 9149 214 0 0 3.18 Continuous Monitoring 2002 16075 4127 79 55 1.85 Continuous Monitoring 2003 13669 777 86 12 2.86
5. DNREC has failed to explain its analysis procedures in a manner allowing stakeholders to verify that attainment decisions are based on scientifically defensible methods; The Department detailed its procedures and the basis for them in the Draft Methodology document and in the final Document. The literature cited supported the methodology. 6. DNREC has not made the required priority ranking of impaired water quality segments and; The Department has been working under a Consent Decree that proscribes the timetable for TMDL promulgation of waters listed on the 1996 303(d) list. The timetable was based on a rotating basin approach. As new waters are added to the list, most will be incorporated into the current TMDL schedule. Those waters and pollutants that would not already be under the Consent Decree schedule are tentatively added to the end of the schedule under the rotating basin time schedule. 7. DNREC has otherwise failed to conduct, document, and explain the proposed listing in accordance with applicable law, regulations and guidance. The Department followed applicable law, regulation and guidance to develop and publish the Tentative List. The Listing Rationale clearly described the methodology and the Department has provided the commenter with relevant information and data in a timely manner.
Commenter: Dominique Lueckenhoff Affiliation: United States EPA DNREC did not identify the sources of data and information used to make the listing determination as part of the submission. EPA requests that DNREC provide that identification in the final submission of the 2004 303(d) list. The sources used to make the determinations are shown below: For the 2004 assessment, the Department considered data and information received on or before January 2, 2004 from the following sources: • Reports prepared in 2002 to satisfy Clean Water Act (CWA) Sections 305(b), 303(d) and 314 and any updates;
• The most recent Section 319(a) nonpoint source assessment;
• Reports of ambient water quality data including State ambient water quality monitoring programs, citizen volunteer monitoring programs, complaint investigations, and other readily available data sources (e.g., EPA’s Storage and Retreival System (STORET), the United States Geological Survey, and research reports), and data and information provided by the public;
• Reports relative to dilution calculations or predictive models;
• Water quality management plans;
• Superfund Records of Decision; and
• Safe Drinking Water Act source water assessments.
• Fish and shellfish advisories
• Restrictions on water sports or recreational contact
In addition to a public notice published in local papers the Department solicited an email list of over 90 stakeholders from within the Department, US EPA, US Fish and Wildlife service, industry, environmental groups and other stakeholders that had expressed an interest in the process in the past. We note that in all cases where a stream was listed due to Biology and Habitat are now categorized as 3 (some data is available, but it is insufficient to make a determination), and the target TMDL date removed. Streams may be delisted (i.e., removed from Part 5 of the list) only if attainment is achieved, a TMDL has been developed or some other additional data indicates that the stream no longer requires listing on Part 5 of the list. The assumption in 1998 when these streams were listed was that sufficient data did exist to list these streams as impaired. DNREC has provided no explanation as to why it has now been determined that the data is now insufficient. EPA requests that DNREC provide additional waterbody-specific information justifying the change or change the CALM code for those waters back to Category 5. EPA would like additional information on how DNREC is planning to collect additional data to make a more precise determination. EPA would encourage DNREC to work with the State’s biologists and use best professional judgement looking at taxa lists, data and patterns in the community make-up to determine the likely cause of impairment (e.g., nutrient enrichment, toxicity), and design follow-up monitoring accordingly. The Department listed streams in the 1998 list for ‘biology’ and ‘habitat’ for those sites that were determined to be either partially supporting, or not supporting based on indices and on the listing
methodology used at the time. During the interim, EPA and the States have further developed assessment methodologies for habitat and biology. Those methodologies include strategies to determine causes for the biological and habitat impairments. Delaware intends to use those published methods to further assess the segments in the near future to determine 1) if the impairments still exist and 2) if there is a pollutant responsible for the impairment. Delaware will modify the categories and TMDL dates as appropriate during the upcoming assessment and listing cycles. Thus the Department believes that the original Category 3 determinations for streams listed for both habitat and biology and for which no pollutant data is available is appropriate.
In all cases where streams were listed due to Habitat, they are now categorized as 4c (impairment or threat is not caused by a pollutant) and the target date for the TMDL removed. DNREC has not supplied any additional information as to how this determination is justified. If DNREC has additional information demonstrating that the impairment on a specific waterbody is not caused by a pollutant, it may be appropriate to remove that specific waterbody from Category 5 to Category 4c. EPA requests that DNREC submit additional waterbody specific information showing that the cause of impairment is not a pollutant consistent with EPA guidance, or to keep the waterbody in Category 5. Once again, streams may be delisted only if attainment is achieved, a TMDL has been developed or some other additional data indicates that the stream no longer requires listing. Instead of delisting, DNREC should be determining what is causing the habitat impairment and listing these streams for that stressor. For example, although it would not be the case statewide, in any case where the habitat impairment is due to sediment, it should be listed as such. EPA regulations and Delaware’s Assessment and Listing methodology make it clear that segments may be removed from a 303(d) list for a variety of reasons, including waters that were listed where there is no pollutant associated with the impairment. To date, the Department has not determined if one or more pollutants was responsible for the impairments thus the changes to the categories were warranted. Based on the comment, the Department changed the segments from category 4c to 5 and will study these issues further.
In the draft “Assessments for Ammonia and Temperature,” DNREC notes a number of waterbodies that are exceeding either ammonia or temperature criteria. Yet, with the exception of Browns Branch of the Murderkill River, no additions to the list have been made based on this assessment. DNREC should explain this discrepancy. The Department noted in the assessments that only one station on Browns Branch had more than one exceedance for ammonia. That station was the only one listed on the draft 303(d) List. In accordance with EPA recommended water quality criteria for ammonia, the assessments document has been changed to note that two or more exceedances in the assessment period would trigger a finding that the waterbody is impaired for ammonia.
Waterbody Specific Comments
DE230-001-02, Naamans Creek, North Branch and South Branch
On the 2002 303(d) list, bacteria was not listed as a pollutant or stressor, yet it appears on this 2004 list and indicates that it was listed in 1996. Please correct or explain this discrepancy. Naamans Creek was listed for bacteria in 1996 and has remained on the list since.
DE300-001-01, Shellpot Creek, Lower Shellpot Creek The 2002 303(d) list indicated that TMDLs for nutrients, DO and bacteria were to be completed for this watershed in 2009, but this 2004 list now indicates 2004. Please correct or explain this change. The correct date for Nutrients, DO and Bacteria in this segment is 2004.
DE040-002, Brandywine Creek, Upper Brandywine For this waterbody, the list indicates that the pollutant CALM code is Category 5 for nutrients, but the list also indicates that a TMDL was completed for nutrients in 2000. The “Surface Water Segment Attainment” list indicates that the CALM code for nutrients is Category 4a. Please correct or explain this discrepancy. This has been corrected in the final list.
DE320-001, White Clay Creek, Mainstem The “Surface Water Segment Attainment” indicates that for this waterbody the zinc concentrations are now below criteria, yet the Category for this parameter remains 4c. Does Delaware plan to acknowledge the attainment of the zinc criteria this on the list? The category has been changed to 1 for zinc in this segment.
DE320-004, White Clay Creek, Muddy River The 303(d) list indicates that this segment of the waterbody is “Muddy River” but station summary indicates that this waterbody is “Middle River.” DNREC should correct this discrepancy. The correct name of the Segment is Middle River. The List has been modified accordingly.
DE120, Christina River In all cases where it applies in the Christina River Basin, DNREC should note that the high flow TMDL for nutrients is scheduled to be completed for 2005. The 2005 deadline has been noted for the appropriate segments. DE120-003, Christina River, Upper Christina River There were no station summary statistics provided for this waterbody. Please explain whether this is an oversight, or if there is none available. No monitoring data are available for this segment. DE120-004-02, Christina River, Belltown Run
The “Surface Water Segment Attainment” indicates “4a” for bacteria, nutrients and dissolved oxygen, yet the list indicates Category 5 for all these parameters. Please correct or explain this discrepancy. Category 5 is the correct category. DE240-001, Nanticoke River, Lower Nanticoke River DNREC is currently seeking to grant intake credits to the Invista Seaford plant in accordance with Delaware regulations at 8.04.d. The parameters for which the facility is seeking intake credits are total suspended solids (TSS) and total organic carbon (TOC). DNREC should review the information from the site to determine if the source of the intake water and the receiving water are exceeding criteria and need to be listed for TSS and/or TOC. In order for the facility to receive the intake credits, the segment must be identified as impaired consistent with Section 303(d) of the Clean Water Act and listed as Category 5. There are no numeric criteria for TOC or TSS in that segment. Permit limits for those parameters are based on technology based permitting requirements. Additionally, the Department is not aware of any use impairments related to either parameter, thus a Category 5 listing is inappropriate at this time.
DE140-004, Indian River, Indian River DE140-E02, Indian River, Upper Indian River Bay In the notes, DNREC indicates that the 316(a) study is currently under EPA review for temperature. Please note the EPA provided comments to DNREC on this study previously. EPA is providing contractor assistance to Delaware to develop a draft NPDES permit for the NRG Indian power plant. That permit, when issued, is expected to address the 316(a) issue. In addition, please note that the TMDL is scheduled to be issued by EPA in December 2004. EPA established a TMDL for temperature for the segment in December of 2004, thus the category for this segment is shown as 4a for temperature. NA, Delaware River, DRBC Zone 5 DNREC is currently seeking to grant intake credits to the DuPont Edgemoor plant in accordance with Delaware regulations at 8.04.d. The parameter for which the facility is seeking intake credits is iron. DNREC should review the information from the site to determine if the source of the intake water and the receiving water are exceeding criteria and need to be listed for iron or any other pollutant for which an intake credit is sought. In order for the facility to receive the intake credits, the segment must be identified as impaired consistent with Section 303(d) of the Clean Water Act and listed as Category 5.
Surface water levels of iron in the segment sometimes exceed the applicable criterion. The Department believes further study of surface water iron levels and a determination of whether a use impairment is resulting from those levels is an appropriate response to the available information. Thus, the Department has listed the segment in Category 3 for iron at this time. As more information becomes available, the Department will make the appropriate listing decisions.
DE160-003, Leipsic River, Tributary from the dam at Garrisons Lake to mouth at Delaware Bay
The “Surface Water Segment Attainment” indicates that the minimum dissolved oxygen criteria are not being attained at this site, yet the segment is not being listed for dissolved oxygen. Please correct or explain this discrepancy.
The draft list assigned an incorrect segment number to the station, and showed a new listing in the incorrect segment. That has been corrected. DE290-L01, Saint Jones River, Moores Lake Dissolved oxygen was delisted in 2002 for this waterbody. Dissolved oxygen is included on this 2004 list, even though the “Surface Water Segment Attainment” indicates that the waterbody is meeting the minimum dissolved oxygen, and that there are not enough data to make a determination on average dissolved oxygen. EPA suggests that DNREC review this information. This has been corrected and shows as Category 1 in the final list. DE220-004, Murderkill River, Browns Branch EPA notes that DNREC has identified an additional pollutant ammonia on the 2004 303(d) list as a parameter in non-attainment in this waterbody. We also note that DNREC indicates that a TMDL has been completed for this parameter in 2001. To our knowledge, the Murderkill TMDL addresses only nitrogen and phosphorous that were identified as the pollutants impairing the waterbody on the 1996 303(d) list. We realize that DNREC feels that by reducing nitrogen due to implementation fo the TMDL, ammonia will also be reduced. EPA cannot agree with that direct assertion. EPA also understands that DNREC is currently in the process of modifying the 2001 TMDL, but that this modified TMDL would not address ammonia impairment. Please indicate an alternate date whether that modified TMDL will address this parameter or the projected date when a TMDL for ammonia would be completed.
Since the source of ammonia in Browns Branch is a point source discharge from the City of Harrington WWTP, both the 2001 adopted Murderkill River TMDLs and the proposed 2004 modifications to the TMDLs would address ammonia impairment in Browns Branch in the following fashion: 1. The adopted 2001 TMDL requires that the concentration of total nitrogen in the effluent from the City of Harrington WWTP should not exceed 6.0 mg/l. To achieve this concentration, the plant will be upgraded to achieve significant nitrification/denitrification. Consequently, the ammonia concentration in the plant’s effluent will be very low (much lower than the 4-6 mg/l that would cause ammonia toxicity). 2. The proposed modifications to the 2001 Murderkill TMDLs require that treated wastewater from the City of Harrington wastewater treatment facility be used for spray irrigation. Furthermore, it requires that stream discharge of effluent be considered only during the winter season or during wet weather periods, when spray irrigation of treated wastewater is not practical. Considering this, the discharge of ammonia, especially during critical summer months, will be totally eliminated. With regard to occasional seasonal discharge, the NPDES permit for the City of Harrington will be drafted in such a way that the discharge of effluent would not cause violation of ammonia criteria in the receiving stream.
Considering the above, it can be concluded that both the adopted Murderkill River TMDLs and the proposed modifications to the 2001 TMDLs would result in attainment of ammonia criteria in the Browns Branch of the Murderkill River.
Also, in 2002, this segment was listed for biology and habitat impairment, but this listing is not included in the 2004. Please correct or explain this discrepancy. The biology and habitat impairments are identified for this segment in the final List. DE220-005, Murderkill River, Upper Murderkill River Dissolved oxygen is identified as a stressor from the headwaters to the confluence with Coursey pond. It is indicated that a TMDL will be completed for this waterbody in 2006, yet it also indicates that a TMDL was completed for dissolved oxygen in 2001. Please explain and/or correct this discrepancy. In 2001, a TMDL was adopted for entire Murderkill River Watershed, including this segment. The date has been corrected in the final list. DE210-L03, Mispillion River, Haven Lake The 2004 303(d) list indicates that this waterbody is being delisted for bacteria based on assessment data. The station summary statistics, however, indicate attainment of bacteria criteria at one sampling location in the waterbody, but insufficient data at another. Based on these statistics, EPA believes this waterbody should be remain listed for bacteria. Delaware disagrees for the following reasons. Haven Lake is a small lake of 82.5 acres. The other station had 5 monitoring events, none of which were above the single sample maximum. The same station that caused the station to be listed had sufficient data to be found in compliance with the methodology. Reanalysis of the data that caused the listing using the current methodology showed that the station would not have been listed in the first place under the current methodology.
DE080-002, Cedar Creek, Upper Cedar Creek The 2004 303(d) list indicates that this waterbody has been delisted for bacteria based on assessment. The station summary statistics, however, indicates attainment of bacteria criteria at one sampling location in the waterbody, but insufficient data at seven others. Based on these statistics, EPA believes this waterbody should be remain listed for bacteria. Further analysis of the available data indicates the most conservative path is to list this segment for bacteria impairment. The final List has been revised accordingly.
In the course of reviewing this tentative 2004 303(d) list, EPA conferred with our colleagues at the U.S. Fish and Wildlife Service (USFWS) and the National Marine Fisheries Service (NOAA Fisheries). Their main comment is a request that Delaware consider the presence of threatened and endangered species when prioritizing which streams need TMDLS and in the development of those TMDLs. This would especially be the case when dealing with pollutants that bioaccumulate, like PCBs and mercury. EPA requests that DNREC consider such prioritization. We are enclosing a copy of the letter that USFWS provided to us on our request for information on Federally listed or proposed threatened and endangered species. In advance of making assessment and listing decisions, the Department requests data and information from many sources including the Fish and Wildlife Service. The Service’s comment letter to EPA noted the presence of Bald Eagles in some watersheds, but no compelling information to indicate a pressing
need to speed up TMDLs that are scheduled per the consent decree. The Department will continue to request information in future listing cycles. If the Department is provided compelling information on a timely basis, it will be considered when prioritizing TMDL development schedules.
Commenter: David Bacher Affiliation: NRG Indian River Operations
(Editors Note: NRG’s comments are summarized below. The full comments are in the appendix.)
…Delaware proposes to list segments DE140-E02 (Indian River: upper portion of estuary from power plant cooling water intake to Pepper Creek, including Island Creek) and DE140-004 (Indian River: saline tidal portion of river from Millsboro Pond to Power Intake). NRG disagrees that either segment ought to be listed, for the reasons presented below. I. Segment DE 140-E02: Data Points Within the Station’s Heat Dissipation Area are Not Exceedences. II. Under the Federal Clean Water Act, 316(a) Takes Precedence Over State Water Quality Standards III. State Law Confirms that the 316(a) Variance is Controlling IV. Segment DE 140-004 Should be Also Delisted for Temperature V. Summer Ambient Water Temperature May Exceed Criterion
The Department recognizes that the temperature requirements in the administratively extended permit are controlling in the segment. Available data and EPA technical analyses indicate that thermal impacts from the plant extend beyond the 300-acre limit within the permit, including both of the referenced segments. EPA established a temperature TMDL for the segments in December of 2004.
Appendix C: 2003 Nutrient Management Commission Annual Report.
Delaware Nutrient Management Commission 2003 Annual Report, Page 1 2003 Annual Report of the Delaware Nutrient Management Commission
to Governor Ruth Ann Minner and the 142nd Delaware General Assembly April 1, 2004
“Water quality is everyone’s responsibility”
Introduction Table of Contents This report includes information about the Delaware Nutrient Introduction 1 Management Commission’s activities in 2003 and will give an Nutrient Management Training, overview of its ongoing efforts to improve water quality. The 1999 Education and Certification 2 Nutrient Management Law (3 Del. C. §2200 et.al.) requires the Best Management Practices 2 Commission to annually report on nutrient management training activities, best management practices implemented, the number of Nutrient Management Planning 2 acres under nutrient management plans and critical areas that will Nutrient Management Plan Audits 3 be targeted for action. Urban Nutrient Management 3 Nutrient Management Relocation 3 The Delaware Nutrient Management Commission made progress Critical Areas 4 in 2003 towards achieving established goals. Priorities for Budget 4 implementing these goals include: Permits for Large Animal Operations 5 Nutrient Management Research Priorities 5 1. Establish a concentrated animal feeding operation Environmental Stewardship Program 6 permitting program; Complaint Resolution 6 2. Continue certification and education of nutrient handlers; Recommended Incentives 6 3. Provide optimal resources for nutrient planning; Background and Contacts 6 4. Promote and continue support of exporting excess poultry Commission Members 7 litter to farms or alternative use projects in need of Program Staff 7 nutrients. University of Delaware Nutrient Specialists 8 The Commission is continuing its efforts to improve the quality of Contact information 8 Delaware’s waters, while preserving the state’s valuable agricultural industries. It has met and is on track to meet the nutrient management deadlines established by 1999 legislation. January 2004 marked a milestone for mandatory certification of all nutrient handlers in the state with a result of 1,853 certifications. The law requires 20% increments for implementing mandatory nutrient management standards starting in 2003. The remaining mandates continue to be phased in every January until we reach the deadline of 2007. To date, 68% of Delaware farmland is enrolled or mandated into program requirements, 28% ahead of the deadline.
The following section fulfills reporting requirements to the Governor and the General Assembly as stated in the Nutrient Management Law. They are followed by additional information, such as an overview of the Commission’s budget, a progress report on permits required for large animal farms, research Public meetings of the Delaware Nutrient Management Commission priorities, environmental stewardship and other background are held monthly at the Delaware Department of Agriculture. information. Page 2, Delaware Nutrient Management Commission 2003 Annual Report Nutrient Management Training, Education and Certification The Commission continues to offer certification classes, as required by law, for nutrient generators, nutrient handlers and nutrient consultants. The University of Delaware Cooperative Extension conducts these classes in support of the Nutrient Management Commission. During 2003, the University conducted 78 certification classes throughout the State. Class participants pursue one of four certification levels that require multiple classes. The Commission has issued 1,853 certifications as outlined and can be individually viewed on the Program’s website (see contact information): 1. Nutrient Generator: 503 2. Private Nutrient Handlers: 1,235 3. Commercial Nutrient Handlers: 12 4. Nutrient Consultants: 103 In-house composting, such as the above, is an approved BMP for Ninety-four demonstration projects were implemented throughout catastrophic poultry mortality management. the State for the purpose of relating research data to commercial farm production. These projects were conducted by the University New Castle County of Delaware Cooperative Extension and were located on 15 Delaware Manure storage structures — 3 farms. The projects included: Acres planted with cover crop — 725 Kent County 1. Starter fertilization in corn Manure storage structures — 8 2. Poultry litter application rates Poultry carcass composters —12 3. Pre-sidedress Soil Nitrate Test Acres planted with cover crop — 5,681 4. Use of diagnostic tools to improve nutrient management Pre-sidedress soil nitrate test — 64 samples representing 12,070 acres 5. Field evaluations of amended poultry litter that could potentially decrease phosphorus concentration Sussex County Manure storage structures — 25 Poultry carcass composters — 19 Acres planted with cover crop — 36,255 Pre-sidedress soil nitrate test — 107 samples representing 9,981 acres In conjunction with county and federal conservation district offices, the Commission developed a Nutrient Management Best Practices source book, which provides nutrient handlers a list of recommended practices. These practices will be part of nutrient management planning that will help reduce nutrient pollution. The source book has been distributed to all certification participants and provides a detailed explanation of 53 practices. The following practices represent a summary of the Commission approved Best Management Practices that can also be found on the website: • Feed Related Amendments • Poultry Litter Amendments • Roof Runoff Management in Feedlots • Storm water Control in Feedlots • Pasture Stream Fencing • Liquid and Non-liquid Manure Handling for Long-term and Short-term Storage Nutrient Management Certification classes were held during the • Animal Mortality Handling year at various locations throughout Delaware such as the one — Daily Mortality/Catastrophic Mortality above. • Analysis and Testing of soil, manure and plant tissue • Nutrient Application Equipment Calibration and Adjustment Best Management Practices • Residue Management and Tillage Practices The Nutrient Management Commission promotes best management Nutrient Management Planning practices, which are actions that can help reduce pollution. These management practices are the backbone of nutrient management and Any business operation that applies nutrients to greater than ten acres will have short-term and long-term results on water quality. They or manages 8,000 pounds of animals will be affected by mandatory include such practices as testing soil before fertilizing, proper timing nutrient management. These people will be randomly selected in 20% and methods of fertilizer (commercial and manure) application, the increments, which started in 2003 and will complete in 2007. They are planting of cover crops and vegetative buffer strips, erosion control, the affected by the following methods: proper disposal of dead animals and general conservation practices. 1. Develop a nutrient management plan or animal waste management The Commission works cooperatively with county conservation districts plan - These plans can be developed by nutrient consultants located to promote and implement nutrient related best management practices. at Kent and Sussex conservation district or by private consultants Many practices that are coordinated by the Districts result in success funded by the Commission; that helps both the environment and the farmer. The following is a 2003 2. Maintain nutrient handling records - Record keeping books have summary of the Districts’ accomplishments: been developed and distributed to simplify requirements; Delaware Nutrient Management Commission 2003 Annual Report, Page 3 3. Submit annual report - A one page nutrient information form Nutrient Management Plan Audits must be provided March 1st, the year after mandatory nutrient planning; A fraction of all nutrient management plans developed and reported to 4. Become certified – Certification deadline was January 1, 2004. the Commission are audited to instill high standards for the plans and More certification classes are scheduled for 2004 for those who practices on the farm or operation. The Commission’s goal is to audit missed the deadline or whose situation has changed. 10 % of nutrient management plans developed each year. This process helps to ensure that plans are meeting the requirements of the law and Although nutrient planning practices are phased in over five years, that they are being utilized. During 2003, program staff audited 15 many nutrient handlers have volunteered as early cooperators. agricultural operations and 4 non-agricultural operations. Volunteer efforts and the mandates have resulted in the establishment of nutrient management plans for more than 87,469 acres during 2003. Urban Nutrient Management To date, 373,030 acres (68%) of agricultural crop land is managed under Commission approved nutrient management practices. In cooperation with The Center for the Inland Bays and the Delaware Nonpoint Source Program, 175,000 brochures were designed and printed for distribution targeting smaller properties in urban and suburban areas. “Managing Nutrients for your Turf Grass and Lawns” is a concise but informative brochure available to homeowners. Help from garden centers, fertilizer stores, University extension offices, other public offices and direct mailings distributed nearly 60,000 brochures.
Farmers can contact their Conservation District or private nutrient consultants for nutrient management planning.
Nutrient Management Plan Development for 2003
Nutrient Management Plan Development for 2003 Total 87,469 Acres Proper non-agricultural nutrient management is critical to improving water quality. Nutrient Management Relocation Many farmers are dealing with excess manure, namely poultry litter, and need to export the manure in order to balance crop nutrient demands. The Commission provides cost assistance for poultry litter cleanout, loading and transport to alternative use projects or to other farms for land
Nutrient Management Planning for past three years
Nutrient Management Planning to Date Total 373,030 Acres
The to date time frame represents current nutrient management The Commission provides financial assistance for relocating excess planning from crop year 2001 to crop year 2004. litter such as above project. Page 4, Delaware Nutrient Management Commission 2003 Annual Report application. Excess litter continues to be transported for land application Critical Areas throughout Delaware as well as to other states such as Maryland, New Jersey, and Virginia. Other relocation projects involve alternative uses The Commission has created a “critical areas” map to help set priorities such as mushroom producers in Pennsylvania. Additionally, the Perdue for the Nutrient Management Program. Such priorities include nutrient AgriRecycle pellet-fertilizer plant is in the third year of operation and is relocation involvement for the export of excess poultry litter. the home for a portion of Delaware’s excess litter. These critical areas encompass most of Sussex County and a portion Through this program, farmers can register by calling a toll free number of Kent. They include the Inland Bays, Nanticoke, Pocomoke, and the or by contacting any of several brokers. A farmer has the option to Murderkill watersheds. move the litter themselves and be reimbursed by the Commission. The Commission’s choices were based on the impaired-waters list 2003 Relocation developed by the Department of Natural Resources and Environmental Control, the level of livestock production within those watersheds and 2003 Relocation input from the Tributary Action Teams. Total 65,469 Tons
Relocation to date
Relocation Projects to Date Total 177,486 Tons
The Perdue AgriRecycle pellet-fertilizer plant exported nearly 15,200 tons of Delaware poultry litter in 2003 and approximately 44,000 tons since commencement. This tonnage is included in the above figures; however, Commission funds did not finance transportation costs to or from the plant.
Relocation Progress to date Budget The Nutrient Management Commission’s accomplishments were made possible by funding provided by the Legislature and Governor Minner. The Nutrient Management Program is well into implementing nutrient planning, relocation and mandated activities as required by the Nutrient Management Law. In the coming year, a third of five mandatory 20% increments of people who handle animal manure or commercial fertilizer will be affected. The following is an outline of the Commission’s budget needs for fiscal year 2005 that will support mandatory nutrient management 2001 2002 2003 As of April 1, practices: 2004 Delaware Nutrient Management Commission 2003 Annual Report, Page 5 The affect to these farms will be similar to the requirements of Budget Request for Fiscal Year 2005 the State Nutrient Management Law. The primary differences include the application for coverage process, manure storage FY 2004 FY 2005 structure design requirements and the federal oversight. Once a farm is declared a CAFO, the owner must apply for coverage, Budget Budget develop a nutrient management plan, maintain records and submit Program Operating Costs: an annual report. The operation will need to meet the following Personnel 192,200 221,700 requirements: Travel 4,000 4,000 • Adequate manure storage; • Proper management of dead animals; Contractual 17,000 17,000 • Diversion of clean water and roof runoff control; Supplies 4,000 4,000 • Application rates based on yield goals, soil samples and manure samples; Information/Education/Certification 221,000 221,000 • Methods for land application of manure; Nutrient Relocation Program 246,000 246,000 • Record keeping; • Proper chemical handling; Federal Funds section 319 200,000 225,000 • Feed management and storage; Nutrient Management Planning 451,800 451,800 • Conservation practices to mitigate nutrient loss. TOTAL $1,336,000 $1,390,500 The Commission, DNREC and DDA are jointly working with EPA to proceed with the CAFO permitting program. A CAFO task The above budget was recommended by Governor Minner as part force group was established and started meeting in March of 2003. Draft CAFO regulations will be presented to the Agricultural of the 2005 operating budget. community during the summer of 2004. The State is scheduled to adopt standards by March of 2005. Permits for Large Animal Operations Nutrient Management Research Priorities A recently codified Federal regulation requires permits for large animal operations called Concentrated Animal Feed Operations (CAFO). A The Nutrient Management Commission is working closely with the past agreement between the Environmental Protection Agency (EPA), University of Delaware College of Agriculture and Natural Resources Department of Natural Resources and Environmental Control (DNREC), to couple research priorities with nutrient management priorities. The Department of Agriculture (DDA) and the Commission has authorized listed priorities are summarized and were recommended to the University the Nutrient Management Program to develop and administer standards in an effort to better balance science based policy development with for CAFOs. modern and responsible nutrient management practices. They relate to implementation of the 1999 Nutrient Management Law and the These standards will affect large animal feeding operations such as concentrated animal feeding operation requirements. poultry farms that raise more than 125,000 birds at a time. There are approximately 50 poultry operations and several other animal operations 1. Temporary in-field poultry litter stockpiling; Standards for that will be affected by the Spring 2006. These standards may also apply temporary stockpiling continue to be an issue and a summary to smaller operations as designated by the Commission and Secretary of of the available published data is needed to better understand the Agriculture. The following size animal operations will be affected by environmental impact from stockpiling. CAFO regulations: 2. Manure and litter application setbacks; The Commission • 700 mature dairy cows is faced with exploring alternative standards to EPA’s 100- • 1,000 beef cattle, heifers or veal calves foot application setback for manure generated by an Animal • 2,500 swine Operation. The application setback pertains to surface waters • 125,000 chickens except laying hens and drainage ditches found throughout Delaware. Alternative • 82,000 laying hens standards will account for site-specific conditions and the • 500 horses implementation of best management practices. 3. Surface flow of Phosphorus; Given the erosion control benefits of no-till conservation practices, there are other site specific consequences when involving the application of litter or manure. Additional data is needed regarding the relative amounts of phosphorus that is carried from the field to surface water. A comparison of conventional tillage, minimum tillage and no- till practices should be assessed for fields receiving litter and manure.
4. Quantifying Nutrient Management Practices; In the continued efforts in quantifying Best Management Practices, confusion is prevalent at all levels of government. A matrix is requested that will rank or quantify Nitrogen and Phosphorus environmental benefits from BMPs and other nutrient management practices.
5. Phosphorus Critical Sub-surface Flow Path Baseline; As farmers transit to phosphorus limited application rates, it is important to establish a baseline for water quality trends. The phosphorus critical sub-surface flow path needs to be identified Large Animal Operations such as the above poultry farm will need and monitored at field scale levels. This will help measure to meet Federal guidelines by 2007. the effectiveness of phosphorus based nutrient management planning. Page 6, Delaware Nutrient Management Commission 2003 Annual Report
6. Automated sampling during storm events; In many non- During 2003, one formal and 30 informal complaints were received point source nutrient pollution cases, storm events account for a involving manure handling, livestock mortality, odor and commercial majority of all surface transport. Given this fact, there should be fertilizer application. The categories of complaints and operation types more emphasis on sampling before, during and following storm are summarized and follow: events to help represent the intensity of mass transport. Complaint category
Delaware Environmental Stewardship Manure odor 43% Program Manure handling (stockpiling, application, transport) 43% Animal mortality management 10% In an effort to promote environmental stewardship and recognize Lawn care application 4% those individuals who practice it, the Commission, Allen Family Foods, Mountaire Farms and Perdue Farms established the Delaware Operation type Environmental Stewardship Program. Poultry 48% This program recognized poultry growers by evaluating their natural Cattle 31% resource, general farm management, nutrient management, animal Horse 13% mortality management and overall farm conservation. The best Dairy 4% management practices implemented by these individuals contribute to Lawn Care 4% the protection and preservation of the environment, water quality, and agriculture. Recommended Incentives
The 2001 and 2002 winners were nominated and won the Mid Atlantic As the Nutrient Management Program continues to become established, Regional Environmental Award from the U.S. Poultry & Egg Association the Commission recommends continued financial commitment for and were recognized at the International Poultry Exposition in Atlanta, nutrient management planning, nutrient relocation, and best management Georgia. The Delaware Environmental Stewardship awardees follow: practices. Expenses incurred as a result of voluntary efforts or regulatory requirements to implement these practices would significantly reduce • 2003: Ronald and Scott Webb, Greenwood, Mountaire Farms the profitability of agriculture if not assisted by government funding. • 2002: Roland and Laura Hill, Lewis, Allen Family Farms • 2001: Charles P. West II, Gumboro, Perdue Farms Continued funding is the key to successfully implementing the Nutrient Management Program. Background & Contacts
What is the Delaware Nutrient Management Commission?
The Nutrient Management Law established a 19-member Commission that is charged to develop, review, approve, and enforce regulations governing the certification of individuals engaged in the business of land application of nutrients and the development of nutrient management plans. The members of this Commission come from many different backgrounds and professions.
Mission statement
The Delaware Nutrient Management Commission’s official mission is: “To manage those activities involving the generation and application of nutrients in order to help improve and protect the quality of Delaware’s ground and surface waters, sustain and promote a profitable agricultural community, and to help meet or exceed federally mandated water quality standards, in the interest of the overall public welfare.”
What are the Commission’s responsibilities?
Roland and Laura Hill receive the 2002 Environmental Stewardship The Delaware Nutrient Management Commission will: award from Chick Allen and Carl Solberg (far right). 1. Consider establishing critical areas for voluntary and regulatory programs. 2. Establish Best Management Practices to reduce nutrients in the Complaint Resolution environment. 3. Develop educational and awareness programs. Complaints relating to manure application, handling or general farm 4. Consider incentive programs to redistribute nutrients. practices are handled and resolved by Program staff. Formal complaints 5. Establish the elements and general direction of the State Nutrient against any alleged violation of the Nutrient Management Law, regulations Management Program. or standards are investigated by staff and recommended for action by the Commission. 6. Develop nutrient management regulations. Delaware Nutrient Management Commission 2003 Annual Report, Page 7 Members of the Nutrient Management Commission William Vanderwende, Commission Chairman, was appointed to the Bud O’Neill was appointed by the Governor as a Commission by the Senate, and was named Chairman representative for the golf course/lawn care industry. by the Governor. He is a full-time Sussex County dairy He owns an agronomic service firm that plans and producer who represents the state’s dairy industry. He manages turfgrass for golf course, athletic complexes operates a farm with 700-head of dairy, and 3,000 crop and lawns. He is past chairman of the Delaware State acres. He can be reached at (302) 349-4423. Golf Association greens section and can be reached at (302) 697-4659 David Baker, Commission Vice Chairman and Chairman of the Personnel Subcommittee, was appointed by the Brian Schilling, Chairman of the Industry Relations Senate as a representative of the New Castle County Subcommittee, was appointed by the House of grain industry. He is a full-time grain farmer of 3,000 Representatives to represent commercial agricultural acres. He can be reached at (302) 378-3750. nutrient applicators. He is a nutrient consultant and manager of a local agricultural cooperative. He can be Mark Adkins was appointed by the reached at (302) 934-7684. Governor to represent swine farmers. He operates a 900 acre family grain farm and 1,000 swine farm and Carl Solberg, Chairman of the Program & Education is a director of Delaware Swine Producers. He can be Subcommittee, was appointed by the Senate. He reached at (302) 732-3007. represents the Environmental Advocacy Group, and is a volunteer for the Delaware Chapter of the Sierra Club. Robert Baldwin, Director of the Department of Natural He can be reached at (302) 492-1225. Resources and Environmental Control Division of Soil & Water Conservation is appointed by the Nutrient Richard Sterling was appointed by the Governor as a Management Law. He can be reached at (302) 739- representative of the commercial nursery industry. He 4411. operates a 75-acre nursery specializing in evergreens. Stephen Corazza, Chairman of the Government He can be reached at (302) 653-7060. Interaction Subcommittee, was appointed by the House of Representatives to represent New Castle County Charles West II was appointed by the House of poultry producers. He operates a 112,000-bird poultry Representatives to represent Sussex County Poultry farm. He can be reached at (302) 653-3583. producers. He has a 140,000 broiler operation. He can be reached (302) 238-0137. James Elliott was appointed by the Governor as a Sussex County public citizen representative. John Hughes, Secretary of the Delaware Department of He is the past Chairman of the Center for Inland Bays, Natural Resources and Environmental Control, is an ex- an environmental advocacy group. He can be reached officio member of the Commission. He can be reached at (302) 539-3409. at (302) 739-4403
Carlton Fifer was appointed by the Senate. He represents Michael Scuse, Secretary of the Delaware Department of the Kent County vegetable industry, and operates a Agriculture, is an ex-officio member of the Commission. 2,500-acre fruit and vegetable farm. He can be reached He can be reached at (302) 698-4500. at (302) 697-2141. Dr. Gerald Llewellyn serves for Tony Keen, Chairman of the Technology Secretary Vincent Meconi and is currently Chief of the Sub-committee, was appointed by the Senate as a Environment Health Evaluation Branch at the Division nutrient consultant. He owns and operates a private crop of Public Health, within the Department of Health & consulting firm. He can be reached at (302) 684-3196. Social Services (DHSS). His position is ex-officio and can be reached at (302) 744-4540. Connie Larimore, Chairman of the Budget Subcommittee was appointed by the House of Representatives to represent Kent County poultry producers. She owns a 50,000-capacity poultry operation and 150-acre grain farm. She can be reached at (302) Program Staff 398-8304. William Rohrer Jr., is the Program Administrator and Ed Lewandowski, Chairman of the Rules and is an ex-officio member of the Nutrient Management Regulations Subcommittee, was appointed by the House Commission. He can be reached at (302) 698-4500. of Representatives as an Environmental Advocacy Group representative. He is currently the Education and Outreach Coordinator at the Center for the Inland Bays. Steve Hollenbeck is the Environmental Coordinator He can be reached at (302) 645-7325. and he can be reached at (302) 698-4500. Page 8, Delaware Nutrient Management Commission 2003 Annual Report Chris Robinson is the Nutrient Management Coordinator and he can be reached at (302) 698-4500. University of Delaware Nutrient Specialists Several specialist from the University of Delaware provide certifi cation J. Reneé Pope is the Administrative training for the Nutrient Management Program. They also assist the Assistant and she can be reached at (302) program by providing technical recommendations and by conducting 698-4500. research and demonstration projects on nutrient management practices. They are:
Maryann Pielmeier is the Administrative Specialist Dr. Greg Binford is a Extension Nutrient Management and she can be reached at (302)698-4500. Specialist and Assistant Professor of Soil Science with the University of Delaware. He is responsible for educating the public about nutrient management and the impact How to contact the Nutrient Management that nutrient management can have on water quality. He Program can be reached at (302) 831-2146.
To reach program staff members, call (302) 698-4500 or (800) 282-8685, Dr. David Hansen is a nutrient management specialist or send an e-mail to [email protected]. and extension water quality coordinator for the University of Delaware. His extension activities include developing Information about the Nutrient Management Program can be found on and conducting nutrient management training courses in the Internet at www.state.de.us/deptagri. support of the Delaware Nutrient Management Program. How to contact your conservation district He can be reached at (302) 856-7303. Several people assist Dr. Binford and Dr. Hansen in the training The conservation districts provide technical agricultural programs and research and demonstration projects. They are: professionals who can assist in nutrient management strategies and Carl Davis, of the New Castle County Extension Offi ce, at (302) 831- recommendations. 2506. New Castle County – (302) 832-3100 Gordon Johnson, of the Kent County Extension Offi ce, at (302) 697- Kent County - (302) 697-2600 4000. George (Bud) Malone, Extension Poultry Specialist, at (302) 856-7303. Sussex County – (302) 856-3990 Shawn Tingle, Extension Associate, at (302) 856-7303. Derby Walker, of the Sussex County Extension Offi ce, at (302) 856- 7303. Sydney Young, Extension Associate, at (302) 856-7303.
Farming for clean water