Chesapeake Bay TMDL Action Plan

Version History

The City of Hampton (the “City” or “Hampton”) may wish, or be required, to make modifications to this Chesapeake Bay TMDL Action Plan as provided for in MS4 Permit No. VA0088633. Any such modifications will be noted and described below. The most recent date listed below is the “current version” of this Chesapeake Bay TMDL Action Plan.

Date (Version) Modifications Made June 30, 2018 Initial version of Hampton’s Chesapeake Bay TMDL Action Plan, as required by the City’s 2016 MS4 Permit (VA0088633) that became effective on July 1, 2016. April 3, 2018 Revisions per public comments

Chesapeake Bay TMDL Action Plan Page 3 City of Hampton Table of Contents

Please note that page numbers are matched to the pdf file (except for the appendices). The cover is page 1, the certification statement is page 2, and so on.

CERTIFICATION STATEMENT ...... 2 VERSION HISTORY ...... 3 TABLE OF CONTENTS ...... 4 DEFINITIONS & ACRONYMS ...... 5 1. EXECUTIVE SUMMARY ...... 6 1.1 Requirements for This Chesapeake Bay TMDL Action Plan ...... 6 1.2 Steps Undertaken to Prepare This Plan ...... 6 1.3 Summary of This Plan ...... 7 2. BACKGROUND INFORMATION ...... 8 2.1 MS4 Watersheds ...... 8 2.2 Population and Stormwater Infrastructure ...... 8 2.3 MS4 Permit Coverage ...... 8 2.4 MS4 Program Plan ...... 8 2.5 MS4 Annual Reports ...... 8 2.6 Contacts ...... 8 3. REQUIRED COMPONENTS OF THE CHESAPEAKE BAY TMDL ACTION PLAN ...... 9 3.1 Review of the Current MS4 Program Plan ...... 9 3.2 New or Modified Legal Authorities ...... 9 3.3 Means and Methods to Address Discharges into the MS4 from New Sources ...... 10 3.4 Estimate of Annual POC Loads Discharged from Existing Sources as of June 30, 2009 ...... 10 3.5 Determination of Total Pollutant Load Reductions Necessary to Reduce the Annual POC Existing Loads ...... 11 3.6 Means and Methods to Meet the Required Reductions ...... 11 3.7 Means and Methods to Reduce an Additional 15% of Total Pollutant Load Reduction ...... 11 3.8 Estimate of the Expected Cost to Implement the Necessary Reductions During the Permit Cycle ...... 12 3.9 Opportunity for Receipt and Consideration of Public Comment on the Draft Chesapeake Bay TMDL Action Plan ..... 12 3.10 List of All Public Comments Received and Modifications Made in Response to Public Comments ...... 12

APPENDIX A. POLLUTANT LOAD REDUCTION COMPUTATIONS FOR 1ST PERMIT CYCLE ...... 21 APPENDIX B. PUBLIC COMMENTS AND MODIFICATIONS MADE ...... 31

LIST OF TABLES Table 3.4-1. Estimate of Annual POC Loads Discharged from Existing Sources as of June 30, 2009 ...... 13 Table 3.5-1. Total Pollutant Load Reductions Necessary to Reduce the Annual POC Existing Loads ...... 14 Table 3.6-1. Means and Methods to Meet the Required Reductions ...... 15 Table A-1. BMP Calculations for the First Permit Cycle in the James River Basin ...... 23 Table A-2. BMP Calculations for the First Permit Cycle in the York River Basin ...... 27

LIST OF FIGURES Figure 3.4-1. MS4 Service Area and Excluded Land ...... 16 Figure 3.4-2. Regulated MS4 Service Area ...... 17 Figure 3.4-3. Regulated MS4 Service Area in the James and York River Basins...... 18 Figure 3.4-4. Impervious and Pervious Land in the James and York River Basins ...... 19 Figure 3.6-1. First-Cycle Projects in the James and York River Basins ...... 20

Chesapeake Bay TMDL Action Plan Page 4 City of Hampton Definitions & Acronyms

The following definitions shall apply to this Chesapeake Bay TMDL Action Plan:

Action Plan – unless specifically stated otherwise, the Chesapeake Bay TMDL Action Plan Permit – unless specifically stated otherwise, the City’s current MS4 permit valid from July 1, 2016 to June 30, 2021

The following acronyms are used in this Chesapeake Bay TMDL Action Plan:

BMP – Best Management Practice CIP – Capital Improvement Project (or ‘Projects’, typically referring to Hampton’s CIP budget) City – unless specifically stated otherwise, the City of Hampton DEQ – Virginia Department of Environmental Quality EOS – Edge of Stream EPA – The U.S. Environmental Protection Agency HRSD – Hampton Roads Sanitation District MS4 – Municipal Separate Storm Sewer System L2 – Level 2 (scoping run of Chesapeake Bay Watershed Model) MTD – Manufactured Treatment Devices NAVD88 – North American Vertical Datum of 1988 POCs – Pollutants of Concern (Specifically Nitrogen, Phosphorus, and Total Suspended Solids) RMA – Resource Management Area RPA – Resource Protection Area SLAF – Stormwater Local Assistance Fund (administered by DEQ) SWIFT – Sustainable Water Initiative for Tomorrow (HRSD program) TMDL – Total Maximum Daily Load TN – Total Nitrogen TNCC – Thomas Nelson Community College TP – Total Phosphorous TSS – Total Suspended Solids VAMSA – Virginia Municipal Stormwater Association VDOT – Virginia Department of Transportation VPDES - Virginia Pollutant Discharge Elimination System VSMP – Virginia Stormwater Management Program WIP – Watershed Implementation Plan

Chesapeake Bay TMDL Action Plan Page 5 City of Hampton  (i) An opportunity for receipt and consideration of public 1. Executive Summary comment on the draft Chesapeake Bay TMDL Action Plan.  (j) A list of all comments received as a result of public comment and any modifications made to the draft Chesapeake 1.1 REQUIREMENTS FOR THIS CHESAPEAKE BAY Bay TMDL Action Plan as a result of the public comments.” TMDL ACTION PLAN Tables 1, 2, and 3, mentioned above, may be found in the City’s MS4 permit, available online at Stormwater discharges from the City of Hampton are regulated by http://www.hampton.gov/DocumentCenter/View/12255. state and federal laws. The City operates a “municipal separate storm sewer system” (MS4), that is regulated by the This document contains Hampton’s responses to items (a) Commonwealth of Virginia through a Virginia Stormwater through (j) above, and comprises the City’s Chesapeake Bay Management Program (VSMP) MS4 permit (No. VA0088633). This TMDL Action Plan. permit was reissued in 2016 with new terms, conditions, and requirements that became effective on July 1, 2016. This Action Plan details the City’s estimation of its existing source loads of POCs as of June 30, 2009 based on the Chesapeake Bay The 2016 MS4 permit stipulates that the City, “shall develop and Program’s Phase 5.3.2 watershed model and the required submit to [DEQ] for its review and approval a phased Chesapeake reductions in POCs by the end of the first permit cycle. The means Bay TMDL Action Plan that includes: and methods by which the required reductions can be met have also been addressed.  (a) A review of the current MS4 Program Plan including existing legal authorities and the permittee's ability to ensure 1.2 STEPS UNDERTAKEN TO PREPARE THIS PLAN compliance with this special condition.  (b) Identification of any new or modified legal authorities, such The City of Hampton highly values its water features, and has as ordinances, permits, orders, contracts and inter- invested considerable financial and human capital to protect these jurisdictional agreements, implemented or needing to be vital resources. In addition to performing routine maintenance of its implemented to meet the requirements of this special public waterways and infrastructure and promoting responsible condition. development and land management, Hampton has enacted  (c) The means and methods utilized to address discharges into ordinances to protect the Chesapeake Bay from further pollution the MS4 from new sources. and follows a rigorous program to enforce building regulations and  (d) An estimate of the annual POC loads discharged from the sediment and control practices. existing sources as of June 30, 2009 based on the 2009 Oversight from state and federal regulators has steadily increased progress run. The permittee shall utilize Table 1 and multiply over the past decades, and Hampton has complied with all the total existing acres served by the MS4 on June 30, 2009 requirements. and the 2009 Edge of Stream (EOS) Loading Rate.  (e) A determination of the total pollutant load reductions In November 2010, Hampton City Council established the Hampton necessary to reduce the annual POC existing loads using Comprehensive Waterways Management Plan Steering Table 2 by multiplying the Total Existing Acres served by MS4 Committee to secure citizen guidance on how to effectively by the First Permit Cycle Required Reduction in Loading Rate. manage issues related to the City’s waterways and shorelines. The  (f) The means and methods, such as the management committee was charged with development of a comprehensive set practices and retrofit programs that will be utilized to meet the of goals, strategies and criteria to guide future City policies and required reductions identified in Part I.D.1.b)(1)(e) and a investments regarding waterways management. The Steering schedule to achieve those reductions. The schedule should Committee, comprised of interested citizens and staff, met regularly include annual benchmarks to demonstrate the ongoing from November 2010 until November 2011 to develop a progress in meeting the reductions. Comprehensive Waterway Management Plan to address tidal  (g) The means and methods to reduce 15% of total pollutant flooding, stormwater management, shoreline protection and load reduction calculated in (e) to offset increased loads from waterways management and maintenance. This committee new sources initiating construction between July 1, 2009 and produced far-reaching recommendations for policies and future June 30, 2014 and grandfathered projects in accordance with studies to identify specific projects that, among other goals, will help 9 VAC 25-870-48, that disturb one acre or greater as a result reduce water pollution. of the utilization of an average land cover condition greater than 16% impervious cover for the design of post-development The Committee recommended that detailed watershed studies be stormwater management facilities. The permittee shall utilize prepared to investigate and identify opportunities to reduce flooding Table 3 to develop the equivalent pollutant load for nitrogen and pollution in the City’s 22 watersheds. These studies are being and total suspended solids. phased, but considerable progress has been made. The City posts  (h) An estimate of the expected cost to implement the the studies at http://www.hampton.gov/2390/Watershed-Studies- necessary reductions during the permit cycle. Plans as each is completed. These studies have identified many of

Chesapeake Bay TMDL Action Plan Page 6 City of Hampton the water quality retrofit projects that appear in this Chesapeake basin at a total estimated cost of $10.4 million in 2018 dollars. Bay TMDL Action Plan. Some of these projects have already been constructed and some are in stages of planning and design. SLAF funding has been Hampton City staff continuously monitors regulatory requirements, secured for four (4) projects totaling over $1.4 million. and has actively participated in collaborative permit negotiations with DEQ and other Hampton Roads MS4 permittees. Keeping Using computational guidance provided by DEQ, Hampton abreast of the regulatory requirements has allowed the City to estimates the total annual reductions in its discharges of position itself to comply with its current MS4 permit by having pollutants to the Chesapeake Bay will be 1,209.04 pounds of potential projects generated from watershed studies. Nitrogen, 376.34 pounds of Phosphorus, and 148,999 pounds of Total Suspended Solids by the end of the first permit cycle. Hampton has also used its watershed studies to take advantage of funding provided through DEQ using Virginia’s Stormwater Local Hampton reserves the right to substitute other means and methods Assistance Fund. for any of these BMPs, in accordance with the MS4 permit, if it becomes advantageous to the City to do so. Likewise, the To prepare this Chesapeake Bay TMDL Action Plan, Hampton had implementation schedule is only an estimate, and the City reserves to determine the POC loads from existing sources. To do so, the the right to reschedule any of these projects, providing the terms of City delineated its MS4 boundary using guidance from the Virginia the MS4 permit are satisfied. Hampton intends to make steady Municipal Stormwater Association and definitions from DEQ. The progress implementing these projects using available funding in a City’s GIS data and aerial imagery from 2009 were used to fiscally responsible manner. delineate the MS4 area. Contour information, storm system pipe and structure data, as well as infrared LiDAR data, were used to The next permit cycle, from July 1, 2021 to June 30, 2026 will determine drainage patterns during the delineation process. The require an additional 35 percent of pollutants to be removed, with City’s MS4 service area is shown in Figure 3.4-2. the third permit cycle achieving 100 percent of the mandated reductions. This Action Plan does not directly address requirements Land cover within the MS4 as of June 30, 2009 was also identified for the second and third permit cycle phases. using the City’s aerial imagery and parcel development data, as depicted in Figure 3.4-1. Table 3.4-1 shows how this land cover data is used to compute pollutant loading rates, as prescribed in the MS4 permit. Table 3.5-1 takes the land cover data one step further to compute the pollutant reduction requirements.

With potential projects, largely identified from its watershed studies, and given the pollutant reduction requirements identified in Table 3.5-1, the City was able to develop a list of feasible potential BMP projects to meet the 5.75-percent level of compliance of this first permit cycle, as described in Section 3.6. 1.3 SUMMARY OF THIS PLAN

As prescribed in the City’s MS4 permit, this Chesapeake Bay TMDL Action Plan is phased.

The first permit cycle, from July 1, 2016 to June 30, 2021, requires the City to implement means and methods to achieve at least 5.75 percent of its total required reductions under the Chesapeake Bay TMDL. The reductions in discharges of nitrogen, phosphorous, and total suspended solids to the Chesapeake Bay are achieved through the implementation of Best Management Practice (BMP) projects, most of which require some sort of construction. This Action Plan identifies specific BMPs the City intends to utilize to satisfy the first permit cycle requirements.

Due to its location between the James and York Rivers, Hampton must satisfy pollutant reduction requirements for each of these river basins independently.

As summarized in Sections 3.6 through 3.8 of this Action Plan, the City intends to implement seven BMP retrofit projects in the James River basin, and eight projects in the York River

Chesapeake Bay TMDL Action Plan Page 7 City of Hampton 2. Background Information 2.6 Contacts Sharon Surita, PhD was the project manager for the City of Hampton, and was supported by Rob Gourley, PE. Sean Bradberry, ENV SP and Fred Whitley, PE were the project engineer and 2.1 MS4 Watersheds project manager, respectively, for AECOM. John Paine, PE, PH, The City’s MS4 spans 19,918 acres and is bordered by the City of CFM provided production assistance and helped prepare the final Poquoson and York County on the North, the City of Newport News document for GKY & Associates, Inc. on the west, the James River on the south, and the Chesapeake Bay on the east. Stormwater discharges from the City enter sixth (6th) order hydrologic units including:

 Northwest Branch Back River (CB22),  Lower Chesapeake Bay-Back River (CB24),  James River-Cooper Creek (JL43),  Southwest Branch Back River (CB23),  Hampton Roads-Hampton River (JL58), and  Hampton Roads Channel (JL59). 2.2 Population and Stormwater Infrastructure

According to the April 1, 2010 U.S. Census, the City's population is estimated to be 137,436. The City's MS4 consists of over 32,060 structures, approximately 24,957 of which are City-owned, over 220 miles of open conveyance or ditch and 467 miles of pipelines. 2.3 MS4 Permit Coverage

The City first obtained a permit to discharge stormwater from its MS4 in 1996, under Phase I of the National Stormwater Program, administered in Virginia. The permit was re-issued in 2001 and administratively continued until 2016, when a new Virginia Stormwater Management Program ("VSMP") Permit was reissued (MS4 Permit No. VA0088644). The 2016 permit became effective on July 1, 2016 and incorporates substanial new terms and requirements. Ths permit may be reviewed online at https://www.hampton.gov/DocumentCenter/View/12255. The accompanying permit fact sheet is also online, at https://www.hampton.gov/DocumentCenter/View/12288. 2.4 MS4 Program Plan

Hampton submitted an updated MS4 Program Plan to DEQ for approval prior to the end of the FY17 fiscal year. DEQ accepted the updated Program Plan on August 28, 2017 without comment. Hampton’s MS4 Program Plan may be found online at http://www.hampton.gov/DocumentCenter/Home/View/17785.

The 2016 MS4 permit requires Hampton to review the current MS4 Program Plan annually, in conjunction with the preparation of the annual report. 2.5 MS4 Annual Reports

Hampton posts its MS4 annual reports online at http://www.hampton.gov/686/Waterways-Management-Plans- Reports.

Chesapeake Bay TMDL Action Plan Page 8 City of Hampton becomes effective and enforceable 90 days after the date received 3. Required Components of the by DEQ. Chesapeake Bay TMDL Action Given the recent revision and August 28, 2017 acceptance of Hampton’s Program Plan by DEQ, no revisions or modifications to Plan the Program Plan are required to accommodate or facilitate this Chesapeake Bay TMDL Action Plan.

3.2 NEW OR MODIFIED LEGAL AUTHORITIES The “Permit Requirements” described below are taken verbatim from Section I.D.1.b)1) of the City’s MS4 Permit, which states, “No Permit Requirement: I.D.1.b)1)(b) Identifies any new or modified later than 24‐months after the effective date of this state permit, the legal authorities, such as ordinances, permits, orders, contracts and permittee shall develop and submit to the Department for its review inter‐jurisdictional agreements, implemented or needing to be and approval a phased Chesapeake Bay TMDL Action Plan that implemented to meet the requirements of this special condition. includes: The only new legal authorities required for plan implementation will  A Review of the Current MS4 Program Plan, be site-specific permits related to construction activity. These  New or Modified Legal Authorities, include coverage under the General VPDES Permit for Discharges  The Means and Methods to Address Discharges into the of Stormwater from Construction Activities; Hampton Land MS4 from New Sources, Disturbance Permits; Hampton Right-of-Way Permits; and Wetlands  An Estimate of Annual POC Loads Discharged from permits obtained on an as-needed basis. All other local and state Existing Sources as of June 30, 2009, construction and procurement laws are sufficient to implement the  Determination of Total Pollutant Load Reductions plan. Necessary to Reduce the Annual POC Existing Loads, Hampton’s MS4 Program Plan, available online at  The Means and Methods to Meet the Required http://www.hampton.gov/DocumentCenter/Home/View/17785, Reductions, contains summaries of the statutory or regulatory basis for  The Means and Methods to Reduce an Additional 15% of Hampton’s MS4 permit and its existing legal authority. Specifically, Total Pollutant Load Reduction, Hampton is regulated under and complies with:  An Estimate of the Expected Cost to Implement the Necessary Reductions During the Permit Cycle,  The Virginia Stormwater Management Act (§§ 62.1-  An Opportunity for Receipt and Consideration of Public 44.15:24, et seq.), Comment on the Draft Chesapeake Bay TMDL Action  The State Water Control Law Act (§§ 62.1-44.2, et seq.), Plan, and  The Clean Water Act (33 U.S.C. §1251, et seq.),  A List of All Public Comments Received and Modifications  The Virginia Erosion and Sediment Control Law (§§ 62.1- Made in Response to Public Comments. 44.15:51, et seq.),  The Chesapeake Bay Preservation Act (§§ 62.1- 3.1 REVIEW OF THE CURRENT MS4 PROGRAM 44.15:67, et seq.), PLAN  The VSMP Permit Regulation (9VAC 25-870, et seq.),  The EPA NPDES Regulation (40 CFR Part 122), Permit Requirement: I.D.1.b)1)(a) A review of the current MS4  The EPA Effluent Guidelines (40 CFR Part 133 or 400- Program Plan including existing legal authorities and the permittee's 471), ability to ensure compliance with this special condition.  Water Quality Standards (9VAC 25-260, et. seq.), and The City has obtained coverage under a VSMP MS4 Permit  Wasteload Allocations from a TMDL or River Basin Plan. (VA0088633) that authorizes the discharge of stormwater from all existing and new municipal separate stormwater point source The MS4 Program Plan is a consolidation of Hampton’s relevant discharges to surface waters from the MS4 owned or operated by ordinances and other regulatory requirements, the description of the City. programs and procedures (including standard forms to be used for reports and inspections) that will be implemented and enforced to The City maintains a MS4 Program Plan, which was extensively comply with the MS4 permit, and documentation of the selection, updated and submitted to DEQ in 2017, as required in the MS4 design, and installation of stormwater control measures. permit, along with its Permit Year 1 Annual Report. DEQ notified the City on August 28, 2017 that its Program Plan is approved and Hampton generally does not impose more burdensome is now an enforceable part of the MS4 permit. requirements on its citizens than state and federal law require. Hampton ordinances meet all applicable regulatory requirements In accordance with the permit requirements, Hampton has but do not include more stringent language or terms than state and developed and shall submit to DEQ for its review and acceptance, federal law require. this Chesapeake Bay TMDL Action Plan on or before June 30, 2018. Unless specifically denied in writing by DEQ, this plan Chesapeake Bay TMDL Action Plan Page 9 City of Hampton Hampton City Council adopted a resolution approving the Hampton 3.4 ESTIMATE OF ANNUAL POC LOADS Roads Water Quality Credit Agreement on March 22, 2017. This DISCHARGED FROM EXISTING SOURCES AS OF agreement describes a proposed initiative by the Hampton Roads JUNE 30, 2009 Sanitation District to treat wastewater effluent to drinkable standards, and inject it into the groundwater. The “Sustainable Permit Requirement: I.D.1.b)1)(d) An estimate of the annual POC Water Initiative for Tomorrow” (SWIFT) has substantial pollutant loads discharged from the existing sources as of June 30, 2009 reduction potential. If this program proves feasible and is ultimately based on the 2009 progress run. The permittee shall utilize Table 1 approved by DEQ and implemented, Hampton may meet its and multiply the total existing acres served by the MS4 on June 30, Chesapeake Bay TMDL pollutant reduction goals at significantly 2009 and the 2009 Edge of Stream (EOS) Loading Rate. less cost than originally anticipated. To determine the POC loads from existing sources, the City Options for SWIFT are discussed elsewhere in this document, with delineated its MS4 boundary using guidance from VAMSA and caveats. It is unlikely that SWIFT will be used in the current permit definitions from DEQ. The City’s GIS data and aerial imagery from cycle to meet Hampton’s pollutant reduction goals, but the City 2009 were used to delineate the MS4 area. Contour information, reserves the right to do so if it becomes a viable option. storm system pipe and structure data, as well as infrared LiDAR The legal authority to use SWIFT credits would be pursuant to data were used to determine drainage patterns during the Virginia Code § 62.1-44.19:21, which allows the City to acquire and delineation process. The majority of the City’s outfall ditches are use TN and TP credits for purposes of compliance with the tidal at some point, and interstate waters and wetlands are outside of the City’s MS4 jurisdiction. The MS4 area was terminated where Chesapeake Bay TMDL loading reductions of its MS4 VPDES permit, including credits generated by the HRSD Plants by outfall ditches reached “vegetated wetlands.” Virginia’s definition of discharging less TN or TP than permitted under the Watershed vegetated wetlands is those lands between mean low water and an General Permit. Pursuant to Virginia Code § 62.1-44.19:21.1, the elevation above mean low water equal to1.5 times the mean tide City may also acquire and use TSS credits for purposes of range. Using the Sewell’s Point tidal recording station, this elevation is approximately equal to 2.16 on the NAVD88 datum. Figure 3.4-1 compliance with the Chesapeake Bay TMDL loading reductions of maps the resulting MS4 service area and excluded land. its MS4 VPDES permit, including credits generated by the HRSD Plants by discharging less TSS than allocated under the Land cover within the MS4 as of June 30, 2009 was also Chesapeake Bay TMDL. determined using the City’s aerial imagery and parcel development data. The types of land cover identified within the City’s MS4 area 3.3 MEANS AND METHODS TO ADDRESS were: DISCHARGES INTO THE MS4 FROM NEW SOURCES  Regulated Pervious, Permit Requirement: I.D.1.b)1)(c) The means and methods utilized  Regulated Impervious, to address discharges into the MS4 from new sources.  Federal (excluded from the regulated MS4),  State (excluded from the regulated MS4), The City of Hampton requires that stormwater discharges from any  VDOT (excluded from the regulated MS4), new development adhere to the criteria outlined in the VSMP  TNCC (excluded from the regulated MS4), regulations for both water quality and quantity. Post-development  Fort Monroe (excluded from the regulated MS4), stormwater management facilities and structures must meet the  VPDES (excluded from the regulated MS4), design standards and specifications of the Virginia Stormwater  Water (excluded from the regulated MS4), BMP Clearinghouse, and plans for proposed post‐development  Direct Drainage (excluded from the regulated MS4), and stormwater management facilities must be reviewed and approved  Forest (excluded from the regulated MS4). by the City. In addition, all construction activities must follow the minimum standards and requirements outlined in Virginia’s Erosion Forested land was delineated only if it was a contiguous area over and Sediment Control Law as well as the City’s Erosion and one‐half acre. Forested areas on the edge of the MS4 boundary Sediment Control ordinance, to prevent sediment-laden stormwater were included if they were under one‐half acre but were part of a from being discharged into or beyond the MS4. contiguous area greater than one‐half acre. Tidal marsh areas within the MS4 are mapped as forested land, unless they are in Also, the City restricts all development in its RPAs in accordance direct drainage areas. with the Chesapeake Bay Preservation Act. To further protect water quality, Hampton designates all land within the 100-year floodplain Figure 3.4-2 shows the total regulated MS4 area (19,917.85 or 500 feet from the RPA in the southern portion of the City— acres). whichever is greater—to be RMAs. Additionally, Brick Kiln Creek, Salt Ponds and most of the northern Back River drainage basins Figure 3.4-3 divides the regulated MS4 area into the James are designated as RMAs. These RMA designations meet or exceed River Basin (7,778.32 acres) and York River Basin (12,139.53 the Chesapeake Bay Act's minimum technical requirements for acres). RMA designation. Figure 3.4-4 divides the regulated MS4 areas in each river basin into impervious and pervious land. Impervious and Chesapeake Bay TMDL Action Plan Page 10 City of Hampton pervious land within the James River Basin total 3,047.94 and implementation schedule is only an estimate, and the City reserves 4,730.38 acres, respectively. Impervious and pervious land the right to reschedule any of these projects, providing the terms of within the York River Basin total 5,089.05 and 7,050.48 acres, the MS4 permit are satisfied. Hampton intends to make steady respectively. progress implementing these projects using available funding in a fiscally responsible manner. Table 3.4-1 lists the annual pollutant loads generated by existing sources as of June 30, 2009. Using the loading rates Figure 3.6.1 shows the first-cycle projects for the James and prescribed in Table 1 of the MS4 permit, as of June 30, 2009 York River basins. This figure shows only BMP projects that have Hampton’s MS4 generated a total of 152,722 pounds of nitrogen, specific sites—street sweeping is not depicted. 19,095 pounds of phosphorous, and 5,487,276 pounds of total suspended solids per year. For the first permit cycle, Hampton anticipates implementing eight projects in the York River basin and seven projects in the James 3.5 DETERMINATION OF TOTAL POLLUTANT LOAD River basin. These projects will help Hampton achieve first- REDUCTIONS NECESSARY TO REDUCE THE cycle annual pollutant reductions of 1,209.04 pounds of Nitrogen, 376.34 pounds of Phosphorus, and 148,999 pounds ANNUAL POC EXISTING LOADS of Total Suspended Solids. Permit Requirement: I.D.1.b)1)(e) A determination of the total 3.7 MEANS AND METHODS TO REDUCE AN pollutant load reductions necessary to reduce the annual POC existing loads using Table 2 by multiplying the Total Existing Acres ADDITIONAL 15% OF TOTAL POLLUTANT LOAD served by MS4 by the First Permit Cycle Required Reduction in REDUCTION Loading Rate. Permit Requirement: I.D.1.b)1)(g) The means and methods to Applying the land cover data summarized in Section 3.4 with the reduce 15% of total pollutant load reduction calculated in (e) to reduction factors prescribed in Table 2 of the City’s MS4 Permit, offset increased loads from new sources initiating construction Hampton computed the required five% nutrient reductions to reduce between July 1, 2009 and June 30, 2014 and grandfathered the existing annual pollutant loads for the first permit cycle in projects in accordance with 9 VAC 25‐870‐48, that disturb one acre straightforward fashion. Table 3.5-1 lists the total pollutant load or greater as a result of the utilization of an average land cover reductions necessary to reduce the annual POC existing loads condition greater than 16% impervious cover for the design of post- for this permit cycle. development stormwater management facilities. The permittee shall utilize Table 3 to develop the equivalent pollutant load for nitrogen For the first permit cycle, the required annual reductions from and total suspended solids. Hampton’s MS4 are 641.31 pounds of nitrogen, 145.56 pounds of phosphorus, and 56,433.96 pounds of total suspended solids. Hampton’s MS4 permit requires reductions of increased loads from These values and Table 3.5-1 include the additional 15% reduction new sources as well as projects grandfathered under the VSMP described in Section 3.7. regulation. This requirement recognizes that the Phase 5.3.2 Chesapeake Bay Watershed Model does not account for increased 3.6 MEANS AND METHODS TO MEET THE loads after 2009 where the design of post-construction stormwater REQUIRED REDUCTIONS management facilities utilized an average land cover condition greater than 16%. Permit Requirement: I.D.1.b)1)(f) The means and methods, such as the management practices and retrofit programs that will be utilized After weighing considerable input from permittees, stakeholders, to meet the required reductions identified in Part I.D.1.b)(1)(e) and and concerned citizens during the permit drafting process, DEQ a schedule to achieve those reductions. The schedule should determined that requiring Hampton Roads MS4 permittees to meet include annual benchmarks to demonstrate the ongoing progress in an additional 15% pollutant load reduction during the first permit meeting the reductions. cycle would adequately compensate for this shortcoming in the Phase 5.3.2 model. Because the first permit cycle requires 5% Table 3.6-1 list the means and methods Hampton currently compliance with the Chesapeake Bay TMDL, the 15% addition plans to employ to meet the required reductions for the first comprises a total increase of 0.75% in the TMDL requirements. permit cycle. This table includes the pollutant reduction contributions for each BMP project and for street sweeping, the Hampton’s MS4 Permit Fact Sheet, prepared by DEQ and available project costs, and an estimated schedule for project online at https://www.hampton.gov/DocumentCenter/View/12288, implementation. Some BMP projects have already been completed, describes, in detail, how the 15% increase was determined and or will soon be completed. Some of the projects listed have multiple how it is to be applied. types of BMPs; Table 3.6-1 lists only the ‘primary’ BMP type for each project (please see Appendix A for project details). This Chesapeake Bay TMDL Action Plan complies with the 15% requirement. Table 3.5-1 includes the 15% addition in Hampton reserves the right to substitute other means and methods computing the total pollutant reduction requirements, which for any of these BMPs, in accordance with the MS4 permit, if it are used to determine permit compliance in Table 3.6-1. becomes advantageous to the City to do so. Likewise, the Chesapeake Bay TMDL Action Plan Page 11 City of Hampton For the first permit cycle, the required 15% additional annual  Project Description: The City has prepared a draft reductions from Hampton’s MS-4 are 83.65 pounds of Nitrogen, Chesapeake Bay TMDL Action Plan that aims to address 18.99 pounds of Phosphorus, and 7,360.95 pounds of Total all items listed in the City’s MS4 permit Part I. D.1.b). The Suspended Solids. These additional requirements are included and draft TMDL Action Plan will be available March 2, 2018 at addressed in Table 3.6-1. http://hampton.gov/DocumentCenter/View/20869.  How to Comment: The City accepts comments via online 3.8 ESTIMATE OF THE EXPECTED COST TO form, hand-delivery, e-mail, fax or postal mail. All IMPLEMENT THE NECESSARY REDUCTIONS comments and requests must be in writing and be DURING THE PERMIT CYCLE received by the City during the comment period. Submittals must include the names, mailing addresses Permit Requirement: I.D.1.b)1)(h) An estimate of the expected cost and telephone numbers of the commenter/requester and to implement the necessary reductions during the permit cycle. all persons represented by the commenter/requester.  Contact for Public Comments, Document Requests Hampton has estimated the design, property and easement, and and Additional Information: Dr. Sharon Surita, City of construction costs for each BMP project listed in Table 3.6-1. This Hampton, Public Works Department, 22 Lincoln Street, table lists the total project cost in 2018 dollars for each BMP. The 4th Floor, Hampton VA 23369; E-mail: estimated roll-up costs for the entire first permit cycle (5% level of [email protected]; Fax: 757-727-6123. The compliance + 15% of the 5%) are: public may review the draft TMDL Action Plan at the City  $1,306,063 for Design, office named above by appointment or may request  $408,720 for Property and Easement Acquisition, and copies of the documents from the contact person listed  $8,699,340 for Construction. above. These budget items produce a total cost of compliance for the 3.10 LIST OF ALL PUBLIC COMMENTS RECEIVED first permit cycle of $10,414,123 in 2018 dollars. SLAF funding AND MODIFICATIONS MADE IN RESPONSE TO has been secured for four (4) projects totaling over $1.4 million. PUBLIC COMMENTS Hampton is prepared to implement these BMP projects. Some have Permit Requirement: I.D.1.b)1)(j) A list of all comments received as already been constructed, others are in the CIP budget, and others a result of public comment and any modifications made to the draft will be implemented according to the schedule stipulated in the Chesapeake Bay TMDL Action Plan as a result of the public MS4 permit. comments. Hampton reserves the right to substitute other means and methods A description of the public comment process is provided in for any of these BMPs, in accordance with the MS4 permit, if it Appendix B, along with a list of all public comments received and becomes advantageous to the City to do so. modifications made to Hampton’s draft Chesapeake Bay TMDL 3.9 OPPORTUNITY FOR RECEIPT AND Action Plan. CONSIDERATION OF PUBLIC COMMENT ON THE DRAFT CHESAPEAKE BAY TMDL ACTION PLAN

Permit Requirement: I.D.1.b)1)(i) An opportunity for receipt and consideration of public comment on the draft Chesapeake Bay TMDL Action Plan.

A public meeting to present the City's Draft TMDL Action Plan was held March 2, 2018, which initiated the public comment period. The public meeting was advertised as noted below, beginning on February 1, 2018, via the City's webpage, e-news blasts and on designated kiosks at the City Hall main entrance area.

 Purpose of Notice: To seek public comment on the City’s draft TMDL Action Plan.  Public Comment Period: March 2, 2018 to April 2, 2018.  Permittee Name, Address and Permit Number: City of Hampton; Department of Public Works, 22 Lincoln Street, Hampton, Virginia 23669, VA0088633.

Chesapeake Bay TMDL Action Plan Page 12 City of Hampton Table 3.4-1. Estimate of Annual POC Loads Discharged from Existing Sources as of June 30, 2009

Pollutant Loads - James River Basin Regulated MS4 Service Area Estimated POC 2009 EOS Load - 2009 Acres Served as Loading Rate Progress Run Total POC Load Land Cover Pollutant of 6/30/2009 (lbs/ac/yr) (lbs/yr) (lbs/yr) Regulated Urban Impervious 3,047.94 9.574666034 29,183.008 Nitrogen 61,556.611 Regulated Urban Pervious 4,730.38 6.843763814 32,373.603 Regulated Urban Impervious 3,047.94 1.786015931 5,443.669 Phosphorus 7,791.502 Regulated Urban Pervious 4,730.38 0.496330705 2,347.833 Regulated Urban ImperviousTotal Suspended 3,047.94 703.424067500 2,143,994.352 2,634,835.781 Regulated Urban PerviousSolids 4,730.38 103.763636000 490,841.428

Pollutant Loads - York River Basin Regulated MS4 Service Area Estimated POC 2009 EOS Load - 2009 Acres Served as Loading Rate Progress Run Total POC Load Land Cover Pollutant of 6/30/2009 (lbs/ac/yr) (lbs/yr) (lbs/yr) Regulated Urban Impervious 5,089.05 7.309762 37,199.744 Nitrogen 91,165.105 Regulated Urban Pervious 7,050.48 7.654140 53,965.361 Regulated Urban Impervious 5,089.05 1.511968 7,694.481 Phosphorus 11,303.205 Regulated Urban Pervious 7,050.48 0.511841 3,608.725 Regulated Urban ImperviousTotal Suspended 5,089.05 459.679834 2,339,333.659 2,852,439.864 Regulated Urban PerviousSolids 7,050.48 72.776067 513,106.205

Pollutant Loads - Total Hampton MS4 Service Area (James and York River Basins Combined) Estimated POC 2009 EOS Load - 2009 Acres Served as Loading Rate Progress Run Total POC Load Land Cover Pollutant of 6/30/2009 (lbs/ac/yr) (lbs/yr) (lbs/yr) Regulated Urban Impervious 8,136.99 16.884428 66,382.752 Nitrogen 152,721.716 Regulated Urban Pervious 11,780.86 14.497904 86,338.964 Regulated Urban Impervious 8,136.99 3.297984 13,138.150 Phosphorus 19,094.708 Regulated Urban Pervious 11,780.86 1.008172 5,956.558 Regulated Urban Impervious Total Suspended 8,136.99 1163.103902 4,483,328.012 5,487,275.645 Regulated Urban Pervious Solids 11,780.86 176.539703 1,003,947.633

Chesapeake Bay TMDL Action Plan Page 13 City of Hampton Table 3.5-1. Total Pollutant Load Reductions Necessary to Reduce the Annual POC Existing Loads

First Permit Cycle Required Pollutant Reductions - James River Basin First Permit First Permit Cycle Cycle Additional Acres Served Reduction Reduction Additional 15% 15% as of Factor Required Reduction Reduction Total 1st Cycle Reduction Land Cover Pollutant 6/30/2009 (lbs/ac/yr) (lbs/yr) (lbs/ac/yr) (lbs/yr) (lbs/yr) Regulated Urban Impervious 3,047.94 0.043085997 131.324 0.006462900 19.699 151.022 Nitrogen 262.71 Regulated Urban Pervious 4,730.38 0.020531291 97.121 0.003079694 14.568 111.689 Regulated Urban Impervious 3,047.94 0.014288127 43.549 0.002143219 6.532 50.082 Phosphorus 59.87 Regulated Urban Pervious 4,730.38 0.001799199 8.511 0.000269880 1.277 9.788 Regulated Urban Impervious Total Suspended 3,047.94 7.034240675 21,439.944 1.055136101 3,215.992 24,655.935 27,125.48 Regulated Urban Pervious Solids 4,730.38 0.453965907 2,147.431 0.068094886 322.115 2,469.546

First Permit Cycle Required Pollutant Reductions - York River Basin First Permit First Permit Cycle Cycle Additional Acres Served Reduction Reduction Additional 15% 15% as of Factor Required Reduction Reduction Total 1st Cycle Reduction Land Cover Pollutant 6/30/2009 (lbs/ac/yr) (lbs/yr) (lbs/ac/yr) (lbs/yr) (lbs/yr) Regulated Urban Impervious 5,089.05 0.032895000 167.404 0.004934250 25.111 192.515 Nitrogen 378.59 Regulated Urban Pervious 7,050.48 0.022950000 161.809 0.003442500 24.271 186.080 Regulated Urban Impervious 5,089.05 0.012080000 61.476 0.001812000 9.221 70.697 Phosphorus 85.69 Regulated Urban Pervious 7,050.48 0.001848750 13.035 0.000277313 1.955 14.990 Regulated Urban Impervious Total Suspended 5,089.05 4.566800000 23,240.674 0.685020000 3,486.101 26,726.775 29,308.48 Regulated Urban Pervious Solids 7,050.48 0.318412500 2,244.961 0.047761875 336.744 2,581.705

Additonal 15% Pollutant Reductions Total First Permit Cycle Required Pollutant Reductions (James and York River Basins, Combined) (James and York River Basins Combined) Pollutant (lbs/yr) Pollutant (lbs/yr) Nitrogen 83.65 Nitrogen 641.31 Phosphorus 18.99 Phosphorus 145.56 Total Suspended Solids 7,360.95 Total Suspended Solids 56,433.96

Chesapeake Bay TMDL Action Plan Page 14 City of Hampton Table 3-6.1 Means and Methods to Meet the Required Reductions For Hampton's 5% Action Plan

12/22/2017 STATUS KEY: 1 = Funding provided w/ 2017-2021 CIP Checked: JFW POLLUTANT REDUCTIONS 2 = Included in 2017-2021 CIP but not funded 3 = Completed projects By: SMB, JNP JAMES RIVER BASIN YORK RIVER BASIN 4 = In Design TSS TN TP TSS TN TP 5 = In Watershed Study 5% Plan Requirement*1 27,125 262.71 59.87 29,308 378.59 85.69 6 = In Design/Acquisition 7 = 90% Design 5% Plan 42,118 337.15 76.76 106,881 871.89 299.58 Difference*2 14,993 74.44 16.89 77, 573 493.30 213.89 *1 Includes 15% offset for New Sources 2009-2014. TOTALS: 986.47 541.93 410.11 $ 1, 306,063 $ 408,720 $ 8,699,340 $ 10,414,123 $ 1,429,598 148,999 1,209.04 376.34 2 * Positive values indicate the target has been satisfied. ANNUAL NUTRIENT REDUCTION COST PER POUND OF POLLUTANT REMOVAL (POUNDS) (2018 Dollars)

ESTIMATED IMPLEMENT- CONDITION OF PROPERTY & CONSTRUCT- ATION DOWNSTREAM PROPERTY FISCAL DESIGN EASEMENT ION PRIMARY BMP PRIMARY BMP RIVER SCHEDULE CHANNEL/SUMMARY OF ACQUISITION YEAR TOTAL ACRES IMPERVIOUS PERVIOUS COSTS COSTS COSTS TOTAL COST SLAF FUNDED Project ID STORMWATER FEATURE NAME PLAN TYPE CLASSIFICATION STATUS WATERSHED BASIN DISTRICT (FY) IMPROVEMENT REQUIRED? FUNDED SERVED BY BMP ACRES ACRES (2018 Dollars) (2018 Dollars) (2018 Dollars) (2018 Dollars) PROJECTS (%) TSS TN TP TSS TN TP Manager COMMENTS 17-029 Kecoughtan Road Wet Pond 5% 14 Wet Pond 4 Hampton River JAMES 8 2018 TBD No 314.23 118.25 195.98 $68,848 $0 $391,976 $460,824 NA 7,453 89.04 17.58 $59 $4,976 $25,205 Greta Hawkins West & Southampton 14-002 Burbank Elementary - Bioretention 5% 9 Bioretention 3 Back River YORK 3 2016 10-yr capacity provided, No 0.91 0.37 0.54 $110,864 $0 $487,240 $598,104 $216,231 176 4.99 0.65 $3,270 $115,251 $884,769 Rob Gourley Drains to Burbank Elementary Constructed Wetland. for Buildings C&D (Drains to Riverdale reduced peak conveyance. Project complete. The total SLAF funding for project, Constructed Wetland) consisting of 4 BMPs, was $216,231.

14-002 Burbank Elementary - Bioretention 5% 9 Bioretention 3 Back River YORK 3 2016 10-yr capacity No 0.95 0.44 0.51 $110,864 $0 $487,240 $598,104 see comment 201 5.20 0.72 $2,860 $110,596 $798,750 Rob Gourley Drains to Burbank Elementary Constructed Wetland. for Buildings E&F (Drains to Riverdale provided,reduced peak Project complete. The total SLAF funding for project, Constructed Wetland) conveyance. consisting of 4 BMPs, was $216,231.

15-015 Lynnhaven Lake-Wet Pond (Level 2) 5% 14 Wet Pond 4 Back River YORK 1 2019 Man-made curently Yes FY17 118.17 44.14 68.14 $130,416 $0 $1,164,280 $1,294,696 $389,400 19,313 257.03 66.32 $64 $4,843 $18,771 Rob Gourley Grant agreement is not yet signed and will vary Lakeshore overtopping greater than 2- depending on construction bids. year storm, outlet control structure will reduce flooding and erosion issues.

16-009 Wincester Drive Stream Restoration 5% 19 Stream 7 Back River YORK 1 2018 Restored, hydraulic efficiency Yes FY17 700 LF N/A N/A $97,828 $104,000 $506,927 $708,755 $222,523 10,591 52.50 47.60 $64 $12,981 $14,317 Greta Hawkins Grant agreement is not yet signed and will vary (700 LF) Restoration Lakeshore to be improved and allow for depending on construction bids. more storage. 07-014 Forrest Elementary - Level 2 Wet 5% 11 Wet Swale 3 Mary Peake YORK 1 2017 Manmade Yes 33.90 12.10 21.80 $97,828 $104,000 $506,927 $708,755 NA 5,361 89.36 11.78 $127 $7,626 $57,852 Mike Hodges Swale Street Sweeping (York River Basin) 5% 20 Street Sweeping 3 YORK Citywide 2016-2021 No $0 $0 $0 $0 NA 22,092 46.21 17.26 $0 $0 $0 Tyler In operating budget. Richardson 17-021 Cherry Acres Constructed Wetland 5% 13 Constructed 5 Hampton River JAMES 8 2019 TBD Yes 35.99 15.74 19.75 $66,872 $153,920 $540,488 $761,280 NA 7,633 83.24 17.47 $96 $8,794 $41,900 Rob Gourley Wetland West & Southampton 17-022 Linear Wetland Between Mohawk Rd 5% 13 Constructed 5 Hampton River JAMES 4 2019 TBD Yes 16.63 4.77 11.86 $51,688 $46,800 $410,072 $508,560 NA 2,752 31.71 7.20 $178 $15,421 $67,917 Rob Gourley & Eastmoreland Drive Wetland West & Southampton 17-023 King Street Wet Pond 5% 14 Wet Pond 5 Hampton River JAMES 8 2019 TBD No 34.36 13.54 20.82 $105,976 $0 $733,455 $839,431 NA 5,768 47.15 13.01 $140 $17,119 $62,040 Rob Gourley West & Southampton 17-018 Pochin Place Created Wetland 5% 13 Constructed 6 Wythe JAMES 9 2018 TBD No 18.48 5.46 13.02 $105,976 $0 $733,455 $839,431 NA 3,701 45.75 9.91 $218 $17,643 $81,448 Brian Lewis Wetland NA Street Sweeping (James River Basin) 5% 20 Street Sweeping 6 JAMES 2016-2021 No $0 $0 $0 $0 NA 13,977 29.24 10.92 $0 $0 $0 Tyler Richardson 12-001 Coliseum Lake Retrofit 5% 14 Wet Pond 3 Back River YORK 3 2016 Adequate, man-made, No 395.09 321.44 47.18 $137,176 $0 $1,762,800 $1,899,976 $601,444 47,096 387.40 148.48 $39 $4,716 $12,304 Gayle Hicks Assumed no cost for city property. Project complete. Riverdale pollutant load reduction to be provided. 14-002 Burbank Elementary - Wet Pond 5% 14 Wet Pond 3 Back River YORK 3 2016 10-yr capacity No 5.51 2.48 3.02 $110,864 $0 $487,240 $598,104 see comment 816 8.25 2.38 $705 $69,709 $241,639 Rob Gourley Project complete. The total SLAF funding for project, (Level 1) Riverdale provided,reduced peak consisting of 4 BMPs, was $216,231. conveyance. 14-002 Burbank Elementary - Constructed 5% 13 Constructed 3 Back River YORK 3 2016 10-yr capacity No 12.13 3.20 7.49 $110,864 $0 $487,240 $598,104 see comment 1,234 20.95 4.39 $466 $27,451 $131,002 Rob Gourley Project complete. The total SLAF funding for project, Wetland (Level 1) Wetland Riverdale provided,reduced peak consisting of 4 BMPs, was $216,231. conveyance. NA Phoebus Shoreline Stabilization 5% 22 Shoreline 3 Mill Creek JAMES 7 2016 No 0.12 $0 $0 $0 $0 NA 835 11.02 0.67 $0 $0 $0 Greta Hawkins Previously budgeted. Project complete. Stabilization

Chesapeake Bay TMDL Action Plan Page 15 City of Hampton

Figure 3.4-1. MS4 Service Area and Excluded Land

Chesapeake Bay TMDL Action Plan Page 16 City of Hampton Figure 3.4-2. Regulated MS4 Service Area

Chesapeake Bay TMDL Action Plan Page 17 City of Hampton

Figure 3.4-3. Regulated MS4 Service Area in the James and York River Basins

Chesapeake Bay TMDL Action Plan Page 18 City of Hampton

York River Basin: Impervious Area = 5,089.05 Acres Pervious Area = 7,050.48 Acres Total Regulated Area = 12,139.53 Acres

James River Basin: Impervious Area = 3,047.94 Acres Pervious Area = 4,730.38 Acres Total Regulated Area = 7,778.32 Acres

Figure 3.4-4. Impervious and Pervious Land in the James and York River Basins

Chesapeake Bay TMDL Action Plan Page 19 City of Hampton Figure 3.6-1. First-Cycle Projects in the James and York River Basins

Chesapeake Bay TMDL Action Plan Page 20 City of Hampton Appendix A. Pollutant Load Reduction Computations for 1st Permit Cycle

Chesapeake Bay TMDL Action Plan Page 21 City of Hampton Appendix A. Pollutant Load Reduction Computations for 1st Permit Cycle

Table 3.6-1 presents the means and methods to meet the required pollutant reductions for the first permit cycle. This appendix provides the backup computations for the individual projects and pollutant reduction measures, which have been entered into Table 3.6-1.

Chesapeake Bay TMDL Action Plan Page 22 City of Hampton Table A-1. BMP Calculations for the First Permit Cycle in the James River Basin

Kecoughtan Wet Pond Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0 2.36 0.13 77.38 - - - Reg. Pervious 195.98 6.84 0.50 103.76 1,341.24 97.27 20,335.60 Reg. Impervious 118.25 9.57 1.79 703.42 1,132.20 211.20 83,179.90 Total (lbs/yr) 2,473.45 308.47 103,515.49 Removal Efficiencies* 3.6% 5.7% 7.2% Annual Reduction (lbs/yr) 89.04 17.58 7,453.12 *Removal efficiencies are based on the Chesapeake Bay Program Retrofit Curves for a runoff depth of 0.05 inches.

Cherry Acres - Constructed Wetland Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0.5 2.36 0.13 77.38 1.18 0.07 38.69 Reg. Pervious 19.75 6.84 0.50 103.76 135.16 9.80 2,049.33 Reg. Impervious 15.74 9.57 1.79 703.42 150.71 28.11 11,071.89 Total (lbs/yr) 287.05 37.98 13,159.92 Removal Efficiencies* 29% 46% 58% Annual Reduction (lbs/yr) 83.24 17.47 7,632.75 * Removal efficiencies taken from Chesapeake Bay Retrofit Curves. Removal efficiencies were determined using the methodology found in DEQ's Chesapeake Bay TMDL Action Plan Guidance Memo No. 15-2005, dated May 18, 2015. The required treatment volume for a level 1 constructed wetland at this location is approximately 1.6 ac/ft. Due to site constraints, a Tv of 1.6 ac/ft is unlikely to be feasible. An assumed treatment volume of 0.8 ac/ft was used to compute the runoff depth treated, over the impervious area contributing to the wetland. A Tv of 0.8 ac/ft, and a contributing impervious area of 15.74 acres results in a runoff depth treated of 0.61 inches. From the Chesapeake Bay Retrofit curves, a runoff depth of 0.61 inches results in removal efficiencies of 29%, 46%, and 58% for Nitrogen, Phosphorus, and Total Suspended Solids, respectively.

Chesapeake Bay TMDL Action Plan Page 23 City of Hampton Table A-1. BMP Calculations for the First Permit Cycle in the James River Basin

Eastmorland Dr./Mowhawk Rd. - Constructed Wetland (Level 1) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0 2.36 0.13 77.38 - - - Reg. Pervious 11.86 6.84 0.50 103.76 81.17 5.89 1,230.64 Reg. Impervious 4.77 9.57 1.79 703.42 45.67 8.52 3,355.33 Total (lbs/yr) 126.84 14.41 4,585.97 Removal Efficiencies* 25% 50% 60% Annual Reduction (lbs/yr) 31.71 7.20 2,751.58 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 1 created wetland. TSS removal efficiency was taken from the Chesapeake Bay Program Established Efficiencies for wet ponds.

N. King Street - Wet Pond (Level 1) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0 2.36 0.13 77.38 - - - Reg. Pervious 20.57 6.84 0.50 103.76 140.78 10.21 2,134.42 Reg. Impervious 13.79 9.57 1.79 703.42 132.03 24.63 9,700.22 Total (lbs/yr) 272.81 34.84 11,834.64 Removal Efficiencies* 20% 45% 60% Annual Reduction (lbs/yr) 54.56 15.68 7,100.78 *TN andTP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 1 created wetland. TSS removal efficiency was taken from the Chesapeake Bay Program Established Efficiencies for created wetlands.

N. King Street - Wet Pond (Level 1) - New Development Treated Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0 2.36 0.13 77.38 - - - Reg. Pervious 1.26 6.84 0.50 103.76 8.62 0.63 130.74 Reg. Impervious 2.97 9.57 1.79 703.42 28.44 5.30 2,089.17 Total (lbs/yr) 37.06 5.93 2,219.91 Removal Efficiencies* 20% 45% 60% Annual Reduction (lbs/yr) 7.41 2.67 1,331.95 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 1 created wetland. TSS removal efficiency was taken from the Chesapeake Bay Program Established Efficiencies for created wetlands.

King Street Wet Pond TMDL Credit (Total Reduction - Offset for New Development) Total Reductions 54.56 15.68 7,100.78 New Development Treated 7.41 2.67 1,331.95 TMDL Credit 47.15 13.01 5,768.83

Chesapeake Bay TMDL Action Plan Page 24 City of Hampton Table A-1. BMP Calculations for the First Permit Cycle in the James River Basin

Pochin Place - Land Conversion Credits

Land Use Change Load Reductions (lbs/ac/yr) Total Reductions (lbs/yr) Area Converted Acres TN TP TSS TN TP TSS Impervious to Pervious 0.15 2.29 1.60 817.29 0.34 0.24 122.59 Pervious to Forest* 1.36 5.03 0.48 57.82 6.84 0.65 78.64 Impervious to Forest* 0.44 7.31 2.07 875.11 3.22 0.91 385.05 Total Reduction for Land Conversion (lbs/yr) 10.40 1.80 586.28 *Conversion to a wetland treated as a conversion to forest. (Tidal wetlands treated as forest in Chesapeake Bay model) Conversion factors were taken from Table V.H.1 – Land Use Change Conversion Efficiency Table in DEQ's Chesapeake Bay TMDL Action Plan Guidance Memo No. 15-2005 , dated May 18, 2015.

Pochin Place (West Basin) - Created Wetland (Level 1 Design) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0 2.36 0.13 77.38 - - - Reg. Pervious 8.17 6.84 0.50 103.76 55.91 4.06 847.75 Reg. Impervious 3.75 9.57 1.79 703.42 35.90 6.70 2,637.84 Total 11.92 Total (lbs/yr) 91.82 10.75 3,485.59 Removal Efficiencies* 25% 50% 60% Annual Reduction (lbs/yr) 22.95 5.38 2,091.35 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 1 created wetland. TSS removal efficiency was taken from the Chesapeake Bay Program Established Efficiencies for created wetlands.

Pochin Place (East Basin) - Created Wetland (Level 1 Design) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0 2.36 0.13 77.38 - - - Reg. Pervious 4.85 6.84 0.50 103.76 33.19 2.41 503.25 Reg. Impervious 1.71 9.57 1.79 703.42 16.37 3.05 1,202.86 Total 6.56 Total (lbs/yr) 49.56 5.46 1,706.11 Removal Efficiencies* 25% 50% 60% Annual Reduction (lbs/yr) 12.39 2.73 1023.67 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 1 created wetland. TSS removal efficiency was taken from the Chesapeake Bay Program Established Efficiencies for created wetlands.

Pochin Place TOTALS TN TP TSS Pochin Place West Basin 22.95 5.38 2,091.35 Pochin Place East Basin 12.39 2.73 1,023.67 Land Conversion 10.40 1.80 586.28 Total 45.75 9.91 3,701.30

Chesapeake Bay TMDL Action Plan Page 25 City of Hampton Table A-1. BMP Calculations for the First Permit Cycle in the James River Basin

Phoebus Shoreline Stabilization Load Reduction (lbs/ac/yr) Project Reduction (lbs/yr) Protocol Acres TN TP TSS TN TP TSS 1. Prevented Sediment 0 ------2. Denitrification 0.12 85.00 0.00 0.00 10.20 0.00 0.00 3. Sedimentation 0.12 0.00 5.29 6959.00 0.00 0.63 835.08 4. Marsh Redfield Ratio 0.12 6.83 0.30 0.00 0.82 0.04 0.00

Annual Reduction (lbs/yr) 11.02 0.67 835.08 Nutrient reductions calculated using the methodology found in Recommendations of the Expert Panel to Define Removal Rates for Shoreline Management Projects by the Chesapeake Bay Partnership dated 07/13/2015.

Street Sweeping: James River Basin - Practice No. SCP-4 (AST- 1 P4W) Lane Miles/ *Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres Swept TN TP TSS TN TP TSS Reg. Impervious 188.62 15.5 1.93 1300 2,923.61 364.04 245,206.00 Total (lbs/yr) 2,923.61 364.04 245,206.00 Removal Efficiencies* 1% 3% 6% Annual Reduction (lbs/yr) 29.24 10.92 13,976.74 *Loading rates and removal efficiencies were taken from Table 17. Pollutant Reductions Associated with Different Street Cleaning Practices from the expert panel report on street and storm drain cleaning; Recommendations of the Expert Panel to Define Removal Rates for Street and Storm Drain Cleaning Practices, Final Report dated May 19, 2016, for 1 pass every 4 weeks using advanced sweeping technology.

Chesapeake Bay TMDL Action Plan Page 26 City of Hampton Table A-2. BMP Calculations for the First Permit Cycle in the York River Basin

Coliseum Lake - Wet Pond (Pre-Retrofit) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 26.47 2.13 0.07 27.61 56.38 1.85 730.84 Reg. Pervious 47.18 7.65 0.51 72.78 361.12 24.15 3,433.57 Reg. Impervious 321.44 7.31 1.51 459.68 2,349.65 486.01 147,759.49 Total (lbs/yr) 2,767.15 512.01 151,923.90 10% Reduction in Efficiencies Removal Efficiencies* 16% 36% 48% Annual Reduction (lbs/yr) 442.74 184.32 72,923.47 *Removal efficiencies taken from Chesapeake Bay Program Established Efficiencies for a wet pond, with a 20% downward reduction for two missing water quality features: a sediment forebay, and aquatic benches.

Coliseum Lake - Wet Pond (Post Retrofit to Level 2 Wet Pond) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 26.47 2.13 0.07 27.61 56.38 1.85 730.84 Reg. Pervious 47.18 7.65 0.51 72.78 361.12 24.15 3,433.57 Reg. Impervious 321.44 7.31 1.51 459.68 2,349.65 486.01 147,759.49 Total (lbs/yr) 2,767.15 512.01 151,923.90 Removal Efficiencies* 30% 65% 79% Annual Reduction (lbs/yr) 830.15 332.81 120,019.88 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 2 wet pond. TSS removal efficiency taken from Chesapeake Bay Program Retrofit Curves for a runoff depth (RD) of 7.59 inches. Post- 830.15 332.81 120,019.88 Pre- 442.74 184.32 72,923.47 Annual Reduction for Retrofit (lbs/yr) 387.40 148.48 47,096.41

Chesapeake Bay TMDL Action Plan Page 27 City of Hampton Table A-2. BMP Calculations for the First Permit Cycle in the York River Basin

Lynnhaven Lake - Wet Pond (Level 2) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 5.89 2.13 0.07 27.61 12.55 0.41 162.62 Reg. Pervious 68.14 7.65 0.51 72.78 521.55 34.88 4,958.96 Reg. Impervious 44.14 7.31 1.51 459.68 322.65 66.74 20,290.27 Total (lbs/yr) 856.75 102.03 25,411.85 Removal Efficiencies* 30% 65% 76% Annual Reduction (lbs/yr) 257.03 66.32 19,313.01 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 2 wet pond. TSS removal efficiency taken from Chesapeake Bay Program Retrofit Curves for a runoff depth (RD) of 1.51 inches.

Burbank Elementary - Wet Pond (Level 1) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0.01 2.13 0.07 27.61 0.02 0.00 0.28 Reg. Pervious 3.02 7.65 0.51 72.78 23.12 1.55 219.78 Reg. Impervious 2.48 7.31 1.51 459.68 18.13 3.75 1,140.01 Total (lbs/yr) 41.27 5.30 1,360.07 Removal Efficiencies* 20% 45% 60% Annual Reduction (lbs/yr) 8.25 2.38 816.04 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 1 extended wet pond. TSS removal efficiency taken from the Chesapeake Bay Program Established Efficiencies for wet ponds.

Burbank Elementary - Created Wetland (Level 1) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 1.44 2.13 0.07 27.61 3.07 0.10 39.76 Reg. Pervious 7.49 7.65 0.51 72.78 57.33 3.83 545.09 Reg. Impervious 3.2 7.31 1.51 459.68 23.39 4.84 1,470.98 12.13 Total (lbs/yr) 83.79 8.77 2,055.83 Removal Efficiencies* 25% 50% 60% Annual Reduction (lbs/yr) 20.95 4.39 1,233.50 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 1 created wetland. TSS removal efficiency taken from the Chesapeake Bay Program Established Efficiencies for wet ponds.

Chesapeake Bay TMDL Action Plan Page 28 City of Hampton Table A-2. BMP Calculations for the First Permit Cycle in the York River Basin

Burbank Elementary - Bioretention for Buildings C&D (Drains to Created Wetland) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0 2.13 0.07 27.61 - - - Reg. Pervious 0.54 7.65 0.51 72.78 4.13 0.28 39.30 Reg. Impervious 0.37 7.31 1.51 459.68 2.70 0.56 170.08 Total (lbs/yr) 6.84 0.84 209.38 Removal Efficiencies* 64% 55% 60% Annual Reduction (lbs/yr) 4.38 0.46 125.63 Remaining Load to be Treated By Wetland 2.46 0.38 83.75 Wetland Removal Efficiencies* 25% 50% 60% Annual Reduction (lbs/yr) 0.62 0.19 50.25 Total Reduction (lbs/yr) 4.99 0.65 175.88 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for Level 1 bioretention, and created wetlands. TSS removal efficiency taken from the Chesapeake Bay Program Established Efficiencies for bioretention with C/D soils with underdrain, and created wetlands.

Burbank Elementary - Bioretention for Buildings E&F (Drains to Created Wetland) Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0 2.13 0.07 27.61 - - - Reg. Pervious 0.51 7.65 0.51 72.78 3.90 0.26 37.12 Reg. Impervious 0.44 7.31 1.51 459.68 3.22 0.67 202.26 Total (lbs/yr) 7.12 0.93 239.37 Removal Efficiencies* 64% 55% 60% Annual Reduction (lbs/yr) 4.56 0.51 143.62 Remaining Load to be Treated By Wetland 2.56 0.42 95.75 Wetland Removal Efficiencies* 25% 50% 60% Annual Reduction (lbs/yr) 0.64 0.21 57.45 Total Reduction (lbs/yr) 5.20 0.72 201.07 *TN and TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for Level 1 bioretention, and created wetlands. TSS removal efficiency taken from the Chesapeake Bay Program Established Efficiencies for bioretention with C/D soils with underdrain, and created wetlands.

Winchester Drive Stream Restoration *Removal Rates (lbs/lf/yr) Total Removed (lbs/yr) Length of Restoration (LF) TN TP TSS TN TP TSS 700 0.08 0.07 15.13 52.50 47.60 10,591.00

Annual Reduction (lbs/yr) 52.50 47.60 10,591.00 *Removal rates taken from Table V.J.1-Urban Stream Restoration Interim Approved Removal Rates from DEQ's Chesapeake Bay TMDL Action Plan Guidance Memo No. 15-2005, dated May 18, 2015.

Chesapeake Bay TMDL Action Plan Page 29 City of Hampton Table A-2. BMP Calculations for the First Permit Cycle in the York River Basin

Forrest Elementary -Level 2 Wet Swale Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres TN TP TSS TN TP TSS Forest 0 2.13 0.07 27.61 - - - Reg. Pervious 21.8 7.65 0.51 72.78 166.86 11.16 1,586.52 Reg. Impervious 12.1 7.31 1.51 459.68 88.45 18.29 5,562.13 Total (lbs/yr) 255.31 29.45 7,148.64 Removal Efficiencies* 35% 40% 75% Annual Reduction (lbs/yr) 89.36 11.78 5,361.48 *TN, TP removal efficiencies taken from Virginia Stormwater BMP Clearinghouse Established Efficiencies for a Level 2 wet swale. TSS removal efficiency taken from Chesapeake Bay Program Retrofit Curves for a runoff depth (RD) of 1.39 inches.

Street Sweeping: York River Basin - Practice No. SCP-4 (AST- 1 P4W) Lane Miles/ *Loading Rates (lbs/ac/yr) Pollutant Loads (lbs/yr) Land Use Acres Swept TN TP TSS TN TP TSS Reg. Impervious 298.14 15.50 1.93 1,300.00 4,621.17 575.41 387,582.00 Total (lbs/yr) 4,621.17 575.41 387,582.00 Removal Efficiencies* 1.0% 3.0% 5.7% Annual Reduction (lbs/yr) 46.21 17.26 22,092.17 *Loading rates and removal efficiencies were taken from Table 17. Pollutant Reductions Associated with Different Street Cleaning Practices from the expert panel report on street and storm drain cleaning; Recommendations of the Expert Panel to Define Removal Rates for Street and Storm Drain Cleaning Practices, Final Report, dated May 19, 2016, for 1 pass every 4 weeks using advanced sweeping technology.

Chesapeake Bay TMDL Action Plan Page 30 City of Hampton

Appendix B. Public Comments and Modifications Made

Chesapeake Bay TMDL Action Plan Page 31 City of Hampton Appendix B. Public Comments and Modifications Made

No formal comments were submitted during the comment period from March 2, 2018 until April 2, 2018; however, minor revisions were made to the action plan stemming from verbal comments received during the public meeting. These revisions include updating the plan to include SLAF funding received for specific projects and specification of project managers for each respective project. These revisions may be found in Table 3-6.1 Means and Methods to Meet the Required Reductions.

A 1-page handout, summarizing the purpose of the report, was prepared and distributed through several mediums as recommended at the public meeting and is provided herein.

Furthermore, it was suggested to round the pound removal to the nearest whole number; however, as these were calculated values, based on acreage within the MS4 service area to the nearest hundredth, they remain unchanged.

Chesapeake Bay TMDL Action Plan Page 32 City of Hampton The Bay TMDL covers a 64,000-square mile watershed that includes seven Chesapeake Bay TMDL Action Plan FAQ Sheet jurisdictions. Bay jurisdictions include Delaware, Maryland, New York, Q. What is a TMDL? Pennsylvania, Virginia, West Virginia and A. The Clean Water Act (“CWA”) sets an environmental goal that all waters in the United States be the District of Columbia. “fishable” and “swimmable.” It requires states to establish appropriate uses for their waters and adopt water quality standards that are protective of those uses. States are required to develop a list of waterways that do not meet water quality standards. For those waterways, a Total Maximum Daily Load or “TMDL” must be developed. Essentially, a TMDL is a “pollution diet” that identifies the maximum amount of a pollutant the waterway can receive, while still meeting water quality standards.

Q. Why was a TMDL developed for the Chesapeake Bay (the “Bay”) and its tidal tributaries? A. Despite extensive restoration efforts during the last 25 years, the Bay TMDL was prompted by insufficient progress and continued poor water quality in the Bay and its tidal tributaries. The TMDL is required under the federal CWA. The Bay TMDL covers a 64,000-square mile watershed that includes seven jurisdictions. How to Comment: The City accepts comments via online form, hand- delivery, e-mail, fax or postal mail Q. What water quality problems affect the Bay? A. Nitrogen and phosphorus pollution are the most serious problems facing the Bay. Too much Comment Period: nitrogen and phosphorus cause algae blooms that block sunlight to underwater grasses. When the March 2, 2018 – April 2, 2018 blooms decompose, they create “dead zones,” where dissolved oxygen levels are too low to sustain Contact for public comments, document fish and shellfish. Excess sediment also degrades water quality. Poor water quality results in the loss requests and additional information: of habitat for aquatic species through the Bay and its tidal and free flowing rivers. Sharon Surita, City of Hampton Public Works Department Q. What is the City of Hampton doing to reduce the amount of pollutants entering our waterways? th 22 Lincoln Street, 4 Floor A. Hampton has developed a TMDL Action Plan as part of its stormwater permit issued by the state. Hampton VA 23369 E-mail: [email protected] The action plan identifies specific stormwater management projects that are, or will be, designed and Fax: 757-727-6123. constructed. Each project aims to reduce sediment, nutrients and other contaminants of concern, from discharging into the Bay. Some of the stormwater management facilities include bioretention, The online form for commenting can be infiltration, retention ponds, etc. found at the link provided below: https://hamptonmarketing.wufoo.com/ Q. Where can I find more information on Hampton’s Chesapeake Bay TMDL Action Plan? forms/zt15ecg190avyq/ A. The Draft Chesapeake Bay TMDL Action Plan can be found at the link provided below. http://hampton.gov/DocumentCenter/View/20869 Chesapeake Bay TMDL Action Plan Page 34 City of Hampton