IDDE PROGRAM Illicit Discharge Detection & Elimination Program City of Taunton, MA NPDES Small MS4 General Permit

City of Taunton, MA Illicit Discharge Detection & Elimination Program NPDES Small MS4 General Permit June 2019

IDDE PROGRAM

Prepared by: BETA GROUP, INC. Prepared for: City of Taunton

June 2019 Illicit Discharge Detection & Elimination Program IDDE Program City of Taunton, MA

TABLE OF CONTENTS 1.0 Objective ...... 1 2.0 Definitions ...... 2 3.0 Work Completed to Date ...... 3 4.0 Legal Authority and Statement of IDDE Responsibilities ...... 4 5.0 Receiving Waters and Impairments...... 4 6.0 Prohibitions and Required Actions ...... 7 7.0 Allowable Non-Stormwater Discharges ...... 7 8.0 Sanitary Sewer Overflows (SSOs) ...... 8 9.0 Stormwater System Mapping ...... 9 9.1 Phase I Mapping...... 9 9.2 Phase II Mapping...... 9 10.0 Outfall and Interconnection Inventory ...... 10 11.0 Initial Ranking of Outfalls and Interconnections ...... 10 12.0 Dry Weather Outfall and Interconnection Screening and Sampling ...... 11 12.1 Weather Conditions ...... 11 12.2 General Procedure for Dry Weather Outfall Screening/Sampling ...... 12 12.2 Interpreting Results ...... 12 13.0 Total Nitrogen and Total Phosphorus Source Identification Report ...... 13 14.0 Follow-up Ranking of Outfalls and Interconnections ...... 14 15.0 Catchment Investigations...... 14 15.1 System vulnerability Identification ...... 14 15.2 Dry weather Key Junction Manhole Inspections ...... 15 15.3 Wet Weather Investigation ...... 16 16.0 Identification/Confirmation of Illicit Source...... 16 17.0 Illicit discharge removal ...... 17 18.0 Ongoing Screening ...... 17 19.0 Training ...... 17 20.0 Citizen Call in Reports ...... 18 21.0 Indicators of IDDE Program Progress and Reporting ...... 18

Illicit Discharge Detection & Elimination Program IDDE Program City of Taunton, MA

LIST OF TABLES Table 1-1 IDDE Program Implementation Timeline Table 5-1 City of Taunton Waterbodies and Impairments Table 11-1 Initial Outfall Ranking Results

LIST OF APPENDICES Appendix A: Stormwater Outfall Map Appendix B: Outfall & Interconnection Inventory and Priority Ranking Appendix C: IDDE Composite Ranking Map and Sampling Locations Map Appendix D: Screening/Sampling Standard Operating Procedures and Forms Appendix E: IDDE Employee Training Record

ii 1.0 OBJECTIVE Taunton has developed this Illicit Discharge Detection and Elimination (IDDE) program to systematically find and eliminate potential sources of non-stormwater discharges to its municipal separate storm sewer system and implement procedures to prevent future discharges. This IDDE Plan has been developed to address Minimum Control Measure 3 requirements of the United States Environmental Protection Agency’s (USEPA’s) 2016 National Pollutant Discharge Elimination System (NPDES) General Permit for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems (MS4) in Massachusetts, hereafter referred to as the “2016 Massachusetts MS4 Permit” or “MS4 Permit.” The required timeline for implementing the IDDE program is shown in Table 1-1 starting from the effective 2018 date of the NPDES Small MS4 General Permit Number [MAR041164]. Table 1-1 IDDE Program Implementation Timeline

Completion Date from Effective Date of MS4 permit

IDDE Program Requirements 7 10 1 Year 1.5 Years 2 Years 3 Years 4 Years Years Years

Written IDDE Program Plan Complete

SSO Inventory Complete Written Catchment Investigation Procedure Complete

Phase I Mapping Complete Phase II Mapping (updates & added details) IDDE Regulatory Mechanism or By- law (if not already in place) Complete Dry Weather Outfall Screening Follow-up Ranking of Outfalls and Interconnections Nitrogen and Phosphorus Source Identification Report (Annual Report) Catchment Investigations – Problem Outfalls Catchment Investigations – as needed based on screening and sampling results On-going Screening and Composite Annually Sampling Training Annually To note, the City of Taunton finalized and implemented a Stormwater Management Ordinance in July 2014.

2.0 DEFINITIONS The following definitions are provided for terms used in this IDDE Plan. A catchment is the area that drains to an individual outfall or interconnection. Dry weather is when no more than 0.1 inches of rainfall has fallen in a 24-hour period and when significant snow melt has/is occurred. A sanitary sewer overflow (SSO) is a discharge of untreated sanitary wastewater from a municipal sanitary sewer. An illicit discharge is any discharge to a municipal separate storm sewer that is not composed entirely of stormwater, except discharges pursuant to a NPDES permit (other than the NPDES permit for discharges from the municipal separate storm sewer) and discharges resulting from firefighting activities. Illicit discharges may take a variety of forms. Illicit discharges may enter the drainage system through direct or indirect connections. Direct connections may be relatively obvious, such as cross-connections of sewer services to the storm drain system. Indirect illicit discharges may be more difficult to detect or address, such as failing septic systems that discharge untreated sewage to a ditch within the MS4, or a sump pump that discharges contaminated water on an intermittent basis. Some illicit discharges are intentional, such as dumping pollutants). Some illicit discharges are related to the unsuitability of original infrastructure to the modern regulatory environment. Elimination of some discharges may require substantial costs and efforts, such as funding and designing a project to reconnect sanitary sewer laterals. Others, such as improving self-policing of dog waste management, can be accomplished by outreach in conjunction with the minimal additional cost of dog waste bins and the municipal commitment to disposal of collected materials on a regular basis. Regardless of the intention, when not addressed, illicit discharges can contribute high levels of pollutants, such as heavy metals, toxics, oil, grease, solvents, nutrients, and pathogens to surface waters. Interconnection means the point (excluding sheet flow over impervious surfaces) where the permittee’s MS4 discharges to another MS4 or other storm sewer system, through which the discharge is conveyed to waters of the United States or to another storm sewer system and eventually to a water of the United States. Junction Manhole is a manhole or structure with two or more inlets accepting flow from two or more drainage alignments. For the purposes of this report, manholes with inlets solely from individual catch basins are not considered junction manholes. Key junction is a manhole or structure that can represent one or more junction manholes without compromising adequate implementation of the IDDE program. The MATRIX is the Outfall/Interconnection Data and Priority Ranking table MS4 is a municipal separate storm sewer system The MS4 Permit is the United States Environmental Protection Agency’s (USEPA’s) 2016 National Pollutant Discharge Elimination System (NPDES) General Permit for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems (MS4) in Massachusetts An outfall means a point source as defined by 40 CFR § 122.2 as the point where the municipal separate storm sewer discharges to waters of the United States. An outfall does not include open conveyances connecting two municipal separate storm sewers or pipes, tunnels or other conveyances that connect segments of the same stream or other waters of the United States and that are used to convey waters of the United States. (40 CFR § 122.26(b)(9)).

2 Receiving Waters are considered surface waterbodies and wetlands delineated by the USGS 25k hydrography data layers, consisting of rivers, streams, lakes, ponds, springs, impoundments, estuaries, wetlands, coastal waters and vernal pools. The number of outfalls was determined based on outfalls that discharge within a 100 feet of a wetland or 200 feet of a surface water. All other outfalls are considered to be upland of receiving waters and are included in the map for use by the City only. Sanitary Sewer Overflow (SSO) is an unauthorized discharge from the sanitary sewer system. SSO include discharges from manholes or piping that reach waters of the United States, as well as overflows to city streets, sidewalks and other locations. Causes of SSOs can be the result of blockages, electrical failures, collapsed or broken sewer pipes, insufficient conveyance capacity and vandalism. 3.0 WORK COMPLETED TO DATE The 2003 MS4 Permit required each MS4 community to develop a plan to mitigate illicit discharges using a combination of storm system mapping, adoption of a regulatory mechanism to prohibit illicit discharges and enforce this prohibition, and identifying tools and methods to investigate suspected illicit discharges. Each MS4 community was also required to define how confirmed discharges would be eliminated and how the removal would be documented. The City of Taunton has completed the following IDDE program activities consistent with the 2003 MS4 Permit requirements: ∂ Developed a map of outfalls and receiving waters ∂ Developed a Stormwater Ordinance (Chapter 19: Sewers and Drains) ∂ Developed procedures for locating illicit discharges (i.e., visual screening of outfalls for dry weather discharges, dye or smoke testing) ∂ Developed procedures for locating the source of the discharge ∂ Developed procedures for removal of the source of an illicit discharge ∂ Developed procedures for documenting actions and evaluating impacts on the storm sewer system subsequent to removal ∂ Identified 25 illicit cross connections and separated 12 cross-connected catch basins from the sanitary sewer since the Phase I Sewer Rehabilitation Project.

In addition to the 2003 MS4 Permit requirements, other IDDE-related activities that have been completed include: ∂ SSO inventory ∂ Outfall sampling ∂ Additional storm system mapping, including the locations of catch basins, manholes and pipe connectivity ∂ Catchment Delineations ∂ Culvert rehab and replacement ∂ Street sweeping and catch basin cleaning program

4.0 LEGAL AUTHORITY AND STATEMENT OF IDDE RESPONSIBILITIES Per section 1.10.3 of the MS4 General Permit, the City of Taunton’s Stormwater Management Ordinance (Chapter 19: Sewer and Drains) provide legal authority to: prohibit illicit discharges; investigate suspected illicit discharges; eliminate illicit discharges, including discharges from properties not owned by or controlled by the MS4 that discharge into the MS4 system; and implement appropriate enforcement procedures and actions. This ordinance was approved by the City of Taunton in July 2014. The City of Taunton has drafted stormwater by-law which will be finalized no later than October 2021. Section 19-4.5 of the Ordinance establishes he City of Taunton’s Department of Public Works (DPW) as the lead municipal department responsible for administering, implementing, and enforcing the IDDE program pursuant to the provisions of the Stormwater ordinance. The Committee of the Department of Public Works may promulgate rules, responsibilities, and a permitting process to effectuate the purposes of the ordinance. The Department of Public Works may issue a written order to enforce the provisions of the ordinance or the regulations there under, which may include: a. Elimination of illicit connections or discharges to the storm drainage system; b. termination of access to the storm drainage; c. performance of monitoring, analysis, and reporting; d. cessation of unlawful discharges, practices, or operations; and e. remediation of contamination in connection therewith. If the Department of Public Works determines that abatement or remediation of contamination is required, the order shall set forth a deadline for completion of the abatement or remediation. Said order shall further advise that, should the violator or property owner fail to abate or perform remediation within the specified deadline, the city may, at its option, undertake such work, and expenses thereof shall be charged to the violator or property owner. Within thirty (30) days after completing all measures necessary to abate the Violation or to perform remediation, the violator and the property owner will be notified of the costs incurred by the city, including administrative costs. The violator or property owner may file a written protest objecting to the amount or basis of costs with the Department of Public Works within thirty (30) days of receipt of the notification of the costs incurred. If the amount due is not received by the expiration of the time in which to file a protest or within thirty (30) days following a decision of the Department of Public Works affirrning or reducing the costs, or from a final decision of a court of competent jurisdiction, the cost shall become a municipal charge against the property owner. The Department of Public Works shall impose a municipal charges lien as provided in G.L. c. 40 s. 58 and so notify the Collector. The passage of this ordinance by the Municipal Council shall constitute a separate vote for this type of charge. 5.0 RECEIVING WATERS AND IMPAIRMENTS Table 5-1 lists the “impaired waters” within the boundaries of the City of Taunton regulated area based on the Drafted 2016 Massachusetts Integrated List of Waters produced by MassDEP every two years. Impaired waters are water bodies that do not meet water quality standards for one or more designated use(s) such as recreation or aquatic habitat. All receiving (surface) waters in the City of Taunton are identified as Class B classification. Class B waters are designated for the following uses: recreational (fish and wildlife habitat), agricultural and industrial supply and other legitimate uses including navigation.

4 Table 5-1 Impaired Waters: City of Taunton, Massachusetts

Associated Water Body Name Segment ID Location Category Impairment(s) Approved TMDL Big Bearhole Pond MA62011 Southeastern portion of Taunton, 5 Non-Native Aquatic Plants, Dissolved Massasoit State Park Oxygen Cain Pond MA62030 Southeastern portion of Taunton, 5 Dissolved Oxygen, Turbidity Massasoit State Park Cobb Brook MA62-43 Headwaters south of Dunbar 3 Street (in Crapo Bog), Taunton to mouth at confluence with Taunton River Cotley River MA62-41 From outlet of cranberry bog 3 Fecal Coliform, Total Phosphorus, south of Seekell St., Taunton to Total Nitrogen mouth at confluence with the Taunton River Forge River MA62-37 Headwaters, outlet Kings Pond, 3 Raynham to mouth at confluence with the Taunton River Lake Rico MA62148 Southeastern portion of Taunton, 4c Massasoit State Park Lake Sabbatia MA62166 Northeastern portion of Taunton 5 Non-Native Aquatic Plants, Dissolved Oxygen, Middle Pond MA62115 Southeastern portion of Taunton, 4c Massasoit State Park Mill River MA62-29 Headwaters, outlet Lake Sabbatia, 4c Non-Native Aquatic Plants, E.Coli Taunton to mouth at confluence with the Taunton River, (through Whittenton Impoundment Oakland Pond MA62136 3 Prospect Hill Pond MA62149 Southeast of Lake Sabbatia 3 Richmond Pond MA62159 4c

Associated Water Body Name Segment ID Location Category Impairment(s) Approved TMDL Segreganset River MA62-55 Source in wetland north of Glebe 4a Fecal Coliform (Shellfish Harvesting) Street, Taunton to the Montaup Pond Dam (NATID: MA02104) Snake River MA62-28 Headwaters, outlet Winnecunnet 3 Pond, Norton to mouth at inlet of Lake Sabbatia Taunton River MA62-01 Headwaters, confluence of Town 5 E.Coli, Total Phosphorus and Total 40310 and Matfield rivers, Bridgewater Nitrogen to Route 24 bridge and from Route 24 bridge south Three Mile River MA62-57 & Confluence of Wading and 4a Fecal Coliform, Total Phosphorus 40310 MA62-56 Rumford rivers, Norton to dam (NATID: MA03083) behind 66 South Street (Harodite Finishing Co.), Taunton (excluding the approximately 0.5 mile through Oakland Pond segment and from dam (NATID: MA03083) behind 66 South Street (Harodite Finishing Co.) to confluence at mouth of Taunton River Watson Pond MA62205 North of and inlet to Lake Sabbatia 5 E.Coli, Excess Algal Growth, Dissolved Oxygen, Total Phosphorus Notes: ∂ Category 3: waters in which insufficient or no information is available to assess any of their designated uses ∂ Category 4: waters exhibiting impairment for one or more uses, but do not require a TMDL ∂ Category 4a: waters in which the required TMDL has been completed and approved by the EPA ∂ Category 4b : waters in which pollution control measures other than TMDLs are expected to attain all designated uses ∂ Category 4c : waters impaired solely by pollution ∂ Category 5 : waters requiring a TMDL

6 6.0 PROHIBITIONS AND REQUIRED ACTIONS Illicit discharges and sanitary sewer overflows (SSOs) to its MS4 are prohibited. Upon detection of an illicit discharge or SSO, the City will commence actions to locate, identify and eliminate the illicit discharge as expeditiously as possible. Upon identification of the illicit source the City will notify all responsible parties for any such discharge and require immediate cessation of improper disposal practices in accordance with its legal authorities. Where elimination of an illicit discharge within 60 days of its identification as an illicit discharge is not possible, the City will establish an expeditious schedule for its elimination and report the dates of identification and schedules for removal in Taunton’s annual reports. The City will diligently pursue elimination of all illicit discharges, and in the interim, the City will take all reasonable and prudent measures to minimize the discharge of pollutants to and from its MS4. 7.0 ALLOWABLE NON-STORMWATER DISCHARGES The following categories of non-stormwater discharges are allowed under the MS4 Permit unless the City of Taunton, EPA, or the MassDEP identifies them as a significant contributor of pollutants to the MS4. In that case the City shall implement measures to control those sources so they are no longer significant contributors of pollutants or eliminate them entirely. An individual discharge is not allowed, but rather to be deemed an “illicit discharge” and is to be treated as part of the Illicit Discharge Detection and Elimination (IDDE) Program. ∂ Water line flushing ; ∂ Landscape irrigation; ∂ Diverted stream flows; ∂ Rising ground water; ∂ Uncontaminated ground water infiltration (as defined at 40 CFR § 35.2005(20)); ∂ Uncontaminated pumped ground water; ∂ Discharge from potable water sources ; ∂ Foundation drains; ∂ Air conditioning condensate; ∂ Irrigation water, springs; ∂ Water from crawl space pumps; ∂ Footing drains; ∂ Lawn watering; ∂ Individual resident car washing; ∂ Flows from riparian habitats and wetlands; ∂ De-chlorinated swimming pool discharges; ∂ Street wash waters; and, ∂ Residential building wash waters without detergents.

The following categories of non-stormwater discharges are also allowed provided that the City of Taunton DPW is verbally notified prior to the activity: ∂ Discharges necessary to protect health, safety, welfare or the environment; ∂ Dye testing; ∂ Discharges from de-chlorinated swimming pool water provided it is allowed to stand for one week prior to draining or tested for chlorine levels (less than one parts per million (< 1 ppm) prior to draining; and, ∂ Non-storm water discharges permitted under a NPDES permit, waiver, or waste discharge order that has been approved by the EPA and is within compliance shall not apply to prohibition under the MS4 Permit. 8.0 SANITARY SEWER OVERFLOWS (SSOS) The City of Taunton has implemented a program to reduce the volume of infiltration and inflow entering its wastewater collection system. This has served to significantly reduce the number and frequency of SSOs that enter the separate storm sewer system. Projects have included the separation of sewer and drain, reduced infiltration with cured in place pipe rehabilitation, and removal of underdrain connections from the sewer system at several locations. The City of Taunton has identified all known locations where SSOs have discharged to the MS4 within the previous five (5) years. This includes SSOs resulting, during dry or wet weather, from inadequate conveyance capacities, or where interconnectivity of the storm and sanitary sewer infrastructure that allows for communication of flow between the systems. The SSO inventory includes the following information: ∂ Location (approximate street crossing/address and receiving water, if any); ∂ A statement of whether the discharge entered a surface water directly or entered the MS4; ∂ Date(s) and time(s) of each known SSO occurrence (i.e., beginning and end of any known discharge); ∂ Estimated volume(s) of the occurrence; ∂ Description of the occurrence indicating known or suspected cause(s); ∂ Mitigation and corrective measures completed with dates implemented; and ∂ Mitigation and corrective measures planned with implementation schedules. The City maintains the inventory as a part of the SWMP and the Phase II System Mapping. The inventory is updated annually, including the information noted above. One SSO has occurred within the past five years. In accordance with Paragraph B.12 of Appendix B of the MS4 Permit, upon becoming aware of an SSO to the MS4, the City will provide oral notice to EPA within 24 hours. Additionally, the City of Taunton will provide written notice to EPA and MassDEP within five (5) days of becoming aware of the SSO occurrence and will include the information in the updated inventory. The notice will contain all of the information listed in part 2.3.4.4.b. Where common notification requirements for SSOs are included in multiple NPDES permits issued to the City, a single notification may be made to EPA as directed by Taunton’s wastewater or CSO NPDES permit and constitutes compliance with this part.

8 The City will include and update the SSO inventory in its annual report, including the status of mitigation and corrective measures implemented by the City of Taunton to address each SSO identified pursuant to this part. It is understood that the period between detection and elimination of a discharge from the SSO to the MS4 is not a grace period. Discharges from an MS4 that are mixed with an SSO are not authorized by the MS4 Permit and remain unlawful until eliminated. 9.0 STORMWATER SYSTEM MAPPING The City developed a storm sewer system map in 1999, per the NOI, the Stormwater Sewer Map has been developed, but verification is ongoing. The map was updated to meet the requirements of the 2003 MS4 Permit and includes most of the 2016 MS4 permit requirements for Phase I and Phase II. The City owned stormwater system consists of the following; ∂ 4,357 catch basins; ∂ 3,078 drain manholes; ∂ 86 culverts; and, ∂ 114 miles of pipe. 9.1 Phase I Mapping The 2016 MS4 permit requires Phase I mapping to be completed within two (2) years of the effective date of the permit (July 1, 2020) and include the following information: ∂ Outfalls and receiving waters (previously required by the MS4-2003 permit) ∂ Open channel conveyances (swales, ditches, etc.) ∂ Interconnections with other MS4s and other storm sewer systems ∂ Municipally owned stormwater treatment structures ∂ Water bodies identified by name and indication of all use impairments as identified on the most recent EPA approved Massachusetts Integrated List of Waters report ∂ Initial catchment delineations. Topographic contours and drainage system information may be used to produce initial catchment delineations.

Through the Department of Public Works outfall data was updated in 2018, and will be updated periodically as new information becomes available; new maps will be provided in each annual report. The mapping will include a depiction of the City’s separate storm sewer system in the MS4 permit area and is intended to facilitate the identification of key infrastructure and factors influencing proper system operation, and the potential for illicit sanitary sewer discharges. Appendix A provides 11x17 copies of the Stormwater Outfall Location map, for full size maps see Appendix E in the Stormwater Management Plan (SWMP).

9.2 Phase II Mapping Phase II mapping must be completed within ten (10) years of the effective date of the permit (By October 2028) and include the following information or updates to the following information. ∂ Outfall spatial location (latitude and longitude with a minimum accuracy of +/-30 feet) ∂ Pipes ∂ Manholes

∂ Catch basins ∂ Refined catchment delineations. Catchment delineations must be updated to reflect information collected during catchment investigations. ∂ Municipal Sanitary Sewer system (if available) ∂ Municipal combined sewer system (if applicable).

The City will update the mapping as necessary to reflect newly discovered information and required corrections or modifications and will report on the progress towards the completion of the system map in each annual report. 10.0 OUTFALL AND INTERCONNECTION INVENTORY The MS4 Permit requires an assessment and priority ranking of outfalls in terms of their potential to have illicit discharges and SSOs and the related public health significance. The ranking helps determine the priority order for performing IDDE investigations. The priority ranking is to be updated annually to reflect data collected in connection with dry weather screening and other relevant inspections conducted by the City as part of the IDDE program. 11.0 INITIAL RANKING OF OUTFALLS AND INTERCONNECTIONS Initial outfall and interconnection inventory and priority ranking were based on characteristics of their catchment areas as described in part 2.3.4.7(a) of the MS4 Permit. Appendix B provides the outfall inventory and priority ranking matrix. The inventory will be updated annually to include data collected during dry weather screening and other relevant inspections and provided in each annual report. Ranking of outfalls was based on the following criteria. ∂ Previous outfall sampling results indicate likely illicit connection (No = 0, Yes = 3); ∂ Outfalls discharge proximity to public beaches, recreational areas, drinking water supplies or shell fishing (No = 0, Yes = 3); ∂ Receiving water quality based on the latest version of MassDEP Integrated List of Waters (Good = 0, Fair = 2, Poor = 3); ∂ Density of generating sites proximate to the outfall that are institutional, municipal, commercial, or industrial sites with a potential to contribute to illicit discharges (e.g., car dealers, car washes, gas stations, garden centers, industrial manufacturing, etc.) (Low = 1, Medium = 2, High = 3); ∂ Age of development and infrastructure (Low = 1, Medium = 2, High = 3); ∂ Areas once served by combined sewers or septic systems that have been converted to municipal sewer (No = 0, Yes = 3); ∂ Proximity of drain system to aging septic systems (No = 0, Yes = 3); Answers to the criteria listed above were assigned a numerical value. Each outfall was then evaluated based on the criteria. The resulting numerical values were then summed to determine an overall score used to rank each outfall. Each outfall scores were ranked based on the following: ∂ Problem Outfalls - Outfalls/interconnections with known or suspected contributions of illicit discharges based on existing information will be designated as Problem Outfalls. This will include any outfalls/interconnections where previous screening indicates likely sewer input. Problem Outfalls are not required to be screened during a dry weather screening event pursuant to part 2.3.4.7.b. of the MS4 permit. Any outfall with a Score > 6 will also be listed as a problem outfall.

10 ∂ High Priority Outfalls - Denoted by Score ≥ 5 without a previous screening result indicating sewer input. Outfalls/interconnections that have not been classified as Problem Outfalls and that are: o discharging to an area of concern to public health due to proximity of public beaches, recreational areas, drinking water supplies or shellfish beds; o determined by the permittee as high priority based on the characteristics listed above or other available information;

∂ Low Priority Outfalls - Denoted by Score < 5. These Outfalls/interconnections determined by the permittee as low priority based on the characteristics score or other available information.

∂ Excluded Outfalls - Outfalls/interconnections that have no potential for illicit discharges. This category is limited to roadway drainage in undeveloped areas with no dwellings and no sanitary sewers; drainage for athletic fields, parks or undeveloped green space and associated parking without services; cross-country drainage alignments (that neither cross nor are in proximity to sanitary sewer alignments) through undeveloped land.

Table 11-1 Initial Outfall Ranking Results Ranking Status Number of Outfalls Problem 21 High Priority 48 Low Priority 222 Excluded 3

12.0 DRY WEATHER OUTFALL AND INTERCONNECTION SCREENING AND SAMPLING The City of Taunton will conduct screening of all outfalls/interconnections (excluding Problem and excluded Outfalls) in accordance with their initial ranking. The City-owned MS4 infrastructure areas are located within the Taunton Watershed. Within this watershed, there are a total of 658 outfalls and of these 658 locations, specific outfall locations have been determined as the most downstream point(s) for sampling of dry and wet weather flows. These specific locations, 296 total, will be used for ongoing annual dry weather screening and sampling, consistent with the procedures below, to provide a composite sampling result for the watershed. Appendix C provides an 11x17 copy of the IDDE Composite Ranking Map. Further screening and sampling and catchment investigations will be conducted with the procedures described in Sections 12 & 14 based on the composite sampling results if there is evidence of illicit connections. 12.1 Weather Conditions Dry weather screening and/or sampling should occur when there is less than 0.1 inches of rainfall over a 24 hour period and significant snowmelt is not occurring and/or has not occurred. For purposes of determining dry weather conditions, program staff will use precipitation data from one of the four

weather stations, at Wunderground.com. If Wunderground is unavailable, the weather station at the Taunton Municipal Airport (via National Oceanic and Atmospheric Administration is to be used a backup. 12.2 General Procedure for Dry Weather Outfall Screening/Sampling All High and Low Priority Outfalls should be inspected during dry weather within three years of the effective permit date. High and Low Priority Outfalls (in accordance with their ranking) shall be screened/sampled based on the procedure described below. If no flow is observed, but evidence of illicit flow exists, the City will revisit the outfall during dry weather within one week of the initial observation, if practicable, to perform a second dry weather screening and sample any observed flow (proceed as in iv. below). Where flow is found at an outfall/interconnection during a dry weather sampling event, at least one (1) sample will be collected and analyzed at a minimum for: ∂ Ammonia, ∂ Chlorine, ∂ Conductivity, ∂ Salinity, ∂ Dissolved Oxygen (DO) ∂ E. coli (freshwater receiving water), ∂ Fecal Coliform (freshwater receiving water) ∂ Surfactants (such as MBAS), ∂ Temperature, and ∂ Nitrogen and Phosphorus (pollutants of concern); where the discharge is directly into a water quality limited water or a water subject to an approved TMDL the sample will be analyzed for the pollutant(s) identified as the cause of the impairment (such as Total Nitrogen and Total Phosphorus). The receiving waters and pollutants of concern for sampling are identified in Table 5-1 and correspond to map figures in Appendix C. All analyses with the exception of indicator bacteria and pollutants of concern can be performed with field test kits or field instrumentation. Detailed Dry weather screening and sampling procedures, methods and forms can be found in Appendix D. The City will submit all screening and sampling data collected in compliance with the permit in its Annual Report.

12.2 Interpreting Results Outfalls/interconnections where dry sampling results indicate sewer and/or other pollutant input based on the following criteria of the MS4 permit will be considered highly likely to contain an illicit discharge: ∂ Olfactory or visual evidence of sewage, ∂ Ammonia ≥ 0.5 mg/L, surfactants ≥ 0.25 mg/L, and bacteria (Fecal coliform and/or E.Coli) levels greater than the water quality criteria applicable to the receiving water, or ∂ Ammonia ≥ 0.5 mg/L, surfactants ≥ 0.25 mg/L, and detectable levels of chlorine, or

12 ∂ Total Phosphorus ≥ 0.100 mg/L ∂ Total Nitrogen ≥ 0.45 mg/L 13.0 TOTAL NITROGEN AND TOTAL PHOSPHORUS SOURCE IDENTIFICATION REPORT Per the regulations of the MS4 Permit, as stated in Section 2.2.2 and Appendix H, the City of Taunton is subject to additional requirements to address nitrogen and phosphorus in their stormwater discharges because the receiving water bodies within the City of Taunton have been designated as water quality limited due to nitrogen and phosphorus, but do not have an EPA approved TMDL (for nitrogen and phosphorus). As a result, the City of Taunton has and will continue to provide public outreach on the topic as well in implement Best Management Practices (BMPs) for both nitrogen and phosphorus removal, which are presented in the SWMP, and complete a Nitrogen and Phosphorus Source Identification Report. The Report is to be completed within four years of the effective date of the permit (October 2022) as depicted in Table 1-1 and included as part of the year four annual report. This report will include the following information: ∂ Calculation of total MS4 area draining to the water quality limited waters or tributaries in addition to incorporating this into the updated mapping as part of Phase I and Phase II Mapping; ∂ Assessment data collected from screening and monitoring for both nitrogen and phosphorus during dry weather outfall screening as detailed in section 12.0; ∂ Calculation of impervious areas and directly connected impervious area (DCIA) for targeted catchments; ∂ Identification/delineation and priority ranking of potential areas with high nitrogen or phosphorus loading; ∂ Identification of potential retrofits or installations of structural BMPs (for nitrogen and phosphorus removal) with current or planned implementation by year 5 of the permit (October 2023) ∂ Additionally, the City of Taunton will update and re-prioritize the initial outfall and interconnection rankings based on information gathered during dry weather screening. Rankings will be updated periodically as dry weather screening information becomes available, but will be completed within three (3) years of the effective date of the MS4 permit (by July 1, 2021). The City will be relieved of these additional requirements when all receiving waters and downstream segments are no longer impaired due to nitrogen or phosphorus as deemed by MassDEP and EPA concurrently and when an EPA approved TMDL indicates that no additional stormwater controls are necessary based on waste load allocations (per the TMDL). Any approvals or changes made for a TMDL shall be documented in the SWMP. As there is no current TMDL for nitrogen and phosphorus loading, Total Nitrogen and Total Phosphorus threshold values to be used for screening and monitoring are based on ongoing assessment completed by the Taunton River Watershed Authority (TWRA) as well as consultation and direction by MassDEP, RIDEM, and EPA. These threshold values are included in Appendix D.

14.0 FOLLOW-UP RANKING OF OUTFALLS AND INTERCONNECTIONS Taunton will update and re-prioritize the initial outfall and interconnection rankings based on information gathered during dry weather screening, but will be completed within three (3) years of the effective date of the MS4 permit (by July 1, 2021). The MATRIX will be updated annually, if necessary, to reprioritize outfalls and interconnections based on information gathered during dry weather screening. Outfalls/interconnections where relevant information was found indicating sewer input to the MS4 or sampling results indicating sewer input will be considered highly likely to contain illicit discharges from sanitary sources, and such outfalls/interconnections will be ranked at the top of the High Priority Outfalls category for investigation. Other outfalls and interconnections may be re-ranked based on any new information from the dry weather screening. 15.0 CATCHMENT INVESTIGATIONS Once stormwater outfalls with evidence of illicit discharges have been identified, various methods can be used to trace the source of the potential discharge within the outfall catchment area. Catchment investigation techniques include but are not limited to review of maps, historic plans, and records; manhole observation; dry and wet weather sampling; video inspection; smoke testing; and dye testing. This section outlines a systematic procedure to investigate outfall catchments to trace the source of potential illicit discharges. All data collected as part of the catchment investigations will be recorded and reported in each annual report along with an inventory of catchment investigations completed. 15.1 System vulnerability Identification Begin by reviewing relevant mapping and system vulnerability factors (SVF) previously identified for the catchment. Look for any new information that may be available including Board of Health records on septic systems, plans related to recent and historic construction of storm and sanitary sewer infrastructure, and complaint records related to SSOs. Use this information to identify areas within the catchment with higher potential for illicit connections. The presence or absence of SVF for each catchment is to be documented/reported in Annual Reports. Catchments with a minimum of one SVF are subject to wet weather sampling requirements detailed in section 15.3. The presence of a SVF can be identified as any of the following: ∂ History of SSOs, including, but not limited to, those resulting from wet weather, high water table, or fat/oil/grease blockages ∂ Common or twin-invert manholes serving storm and sanitary sewer alignments ∂ Common trench construction serving both storm and sanitary sewer alignments ∂ Crossings of storm and sanitary sewer alignments where the sanitary system is shallower than the storm drain system ∂ Sanitary sewer alignments known or suspected to have been constructed with an underdrain system ∂ Inadequate sanitary sewer level of service (LOS) resulting in regular surcharging, customer back- ups, or frequent customer complaints ∂ Areas formerly served by combined sewer systems ∂ Sanitary sewer infrastructure defects such as leaking service laterals, cracked, broken, or offset sanitary infrastructure, directly piped connections between storm drain and sanitary sewer

14 infrastructure, or other vulnerability factors identified through Inflow/Infiltration Analyses, Sanitary Sewer Evaluation Surveys, or other infrastructure investigations ∂ Sewer pump/lift stations, siphons, or known sanitary sewer restrictions where power/equipment failures or blockages could readily result in SSOs ∂ Any sanitary sewer and storm drain infrastructure greater than 40 years old ∂ Widespread code-required septic system upgrades required at property transfers (indicative of inadequate soils, water table separation, or other physical constraints of the area rather that poor owner maintenance) ∂ History of multiple Board of Health actions addressing widespread septic system failures (indicative of inadequate soils, water table separation, or other physical constraints of the area rather that poor owner maintenance). 15.2 Dry weather Key Junction Manhole Inspections Field crews are to systematically inspect key junction manholes and gather catchment information of the location of MS4 pipes, manholes and the extent of the contributing catchment. Begin at the first key junction up gradient of the outlet/interconnection or previously investigated key junction and work progressively upstream inspecting and sampling at manholes in the storm drain network to isolate the illicit discharge source as follows: During dry weather, key junction manholes will be opened and inspected systematically for visual and olfactory evidence of illicit connections (e.g., excrement, toilet paper, gray filamentous bacterial growth, or sanitary products present). If flow is observed, the City will sample the flow at a minimum for pH, temperature, conductivity, dissolved oxygen, ammonia, chlorine and surfactants using field kits for these analyses. Where sampling results or visual or olfactory evidence indicate potential illicit discharges or SSOs, the area draining to the junction manhole will be flagged for further upstream investigation. Key junction and subsequent manhole investigations will proceed, repeating the inspection and sampling of upstream key junction manholes until the location of suspected illicit discharges or SSOs can be isolated to a pipe segment between two manholes (inspecting from the outfall and moving up into the system). Source isolation and confirmation procedures will then be followed as described in Section 15. If no evidence of an illicit discharge is found, catchment investigations will be considered complete upon completion of key junction manhole sampling. Where catchments do not contain junction manholes, the dry weather screening and sampling will be considered as meeting the manhole inspection requirement and source isolation and confirmation procedures will be followed as described in Section 15. For most catchments, manhole inspections will proceed from the outfall moving up into the system as described. However, depending on the nature of the drainage system and availability it may be more efficient to move from upstream down, particularly if the sources of illicit discharges are believed to be located in the upstream portions of the catchment area. In either case, once a manhole inspection methodology has been selected, investigations will continue systematically through the catchment.

15.3 Wet Weather Investigation At least one wet weather screening and sampling will be conducted at the 296 composite sampling outfall locations (identified for this IDDE Plan) with the same parameters required during dry weather screening. Wet weather condition sampling will be completed to the extent necessary to determine whether wet-weather induced high flows in the sanitary sewers or high groundwater in areas of septic systems result in discharge of sanitary flow to the MS4. Wet weather outfall sampling will be conducted as follows: Wet weather sampling and screening will proceed during or after a storm event of sufficient depth or intensity to produce a stormwater discharge at the outfall. Every effort should be made to sample during the spring (March through June) when groundwater levels are relatively high. The MS4 permit does not require a minimum rainfall event prior to wet weather screening however, it must be an event with enough depth or intensity to produce a stormwater discharge at the outfall. Sampling should be avoided during the initial period of discharge (“first flush”). If wet weather outfall sampling indicates a potential illicit discharge, then additional wet weather source sampling will be performed, as warranted, or source isolation and confirmation procedures will be followed as described in Section 15. If wet weather outfall sampling does not identify evidence of illicit discharges then the wet weather investigation is complete. 16.0 IDENTIFICATION/CONFIRMATION OF ILLICIT SOURCE Where the source of an illicit discharge has been reported and/or delimited between two manholes, more detailed investigation techniques will be used to isolate and confirm the source. Based on the site conditions, one or more of the following techniques may be used: Sandbagging Sandbagging is a technique that can be particularly useful when attempting to isolate intermittent illicit discharges or those with very little perceptible flow. The technique involves placing sandbags or similar barriers (e.g., caulking, weirs/plates, or other temporary barriers) within outlets to manholes to form a temporary dam that collects any intermittent ﬂows that may occur. Sandbags are typically left in place for 48 hours, and should only be installed when dry weather is forecast. If flow has collected behind the sandbags/barriers after 48 hours it can be assessed using visual observations or by sampling. If no ﬂow collects behind the sandbag, the upstream pipe network can be ruled out as a source of the intermittent discharge. Finding appropriate durations of dry weather and the need for multiple trips to each manhole makes this method both time-consuming and somewhat limiting. Dye Testing Dye testing is used to confirm a suspected illicit connection to a storm drain system. Prior to testing, permission to access the site should be obtained. Dye is discharged into the suspected fixture, and nearby storm drain structures and sanitary sewer manholes observed for presence of the dye. Each fixture, such as sinks, toilets, and sump pumps, should be tested separately. A third-party contractor may be required to perform this testing activity. Smoke Testing Smoke testing can be used to locate the source of illicit discharges when there is no obvious potential source. Smoke testing is an appropriate tracing technique for short sections of pipe and for pipes with

16 small diameters. Smoke added to the storm drain system will emerge in connected locations. A third- party contractor may be required to perform this testing activity. Closed Circuit Television Inspection (CCTV) CCTV can be used to locate illicit connections and infiltration from sanitary sewers. In CCTV, cameras are used to record the interior of the storm drain pipes. They can be manually pushed with a stiff cable or guided remotely on treads or wheels. A third-party contractor may be required to perform this testing activity. 17.0 ILLICIT DISCHARGE REMOVAL When the specific source of an illicit discharge is identified, the City will exercise its authority as necessary to require its removal pursuant to part 2.3.4.2 or 2.3.4.3 of the MS4 permit and in accordance with the City of Taunton By-law and/or Ordinance. For each confirmed source the City will include in the annual report the following information: ∂ The location of the discharge and its source(s); ∂ A description of the discharge; ∂ The method of discovery; ∂ Date of discovery; ∂ Date of elimination, mitigation or enforcement action OR planned corrective measures and a schedule for completing the illicit discharge removal; and ∂ Estimate of the volume of flow removed. Within one (1) year of removal of all identified illicit discharges within a catchment area, confirmatory outfall or interconnection screening will be conducted. The confirmatory screening will be conducted in dry weather unless System Vulnerability Factors have been identified, in which case both dry weather and wet weather confirmatory screening will be conducted. If confirmatory screening indicates evidence of additional illicit discharges, the catchment will be scheduled for additional investigation. 18.0 ONGOING SCREENING The City-owned MS4 infrastructure consists of 296 composite sampling locations that will be used for ongoing annual dry and wet weather screening and sampling. Ongoing screening and sampling will be in accordance with procedures described in Section 12 of this plan. Appendix C provides an 8.5 x11 copy of the IDDE Composite Ranking Map, for full size map see Appendix C in the Stormwater Management Plan (SWMP). Further screening and sampling and catchment investigations will be conducted with the procedures described in Sections 12 & 14 based on the composite sampling results if there is evidence of illicit connections. The program has proven to be successful in identifying illicit connections and in the future will use composite sampling results to inspection target efforts. 19.0 TRAINING The City of Taunton will, at a minimum, annually provide training to the appropriate employees about the IDDE program, including how to recognize illicit discharges and SSOs. Training Records will be

maintained by the DPW. Copies of the training records are included in Appendix E. The frequency and type of training will be included in the annual report. 20.0 CITIZEN CALL IN REPORTS The City’s DPW will provide opportunity to report suspected illicit discharges through their stormwater website, email, phone and office visit. Reports by residents and other users of a water body can be effective tools in identifying the presence of illicit discharges. Many communities have set up phone hotlines for this purpose, or have provided guidance to local police departments and dispatch centers to manage data reported in this manner. Municipal employees and the general public should receive education to help identify the signs of illicit discharges and should be informed how to report such incidents. When a call is received about a suspected illicit discharge, an IDDE Incident Tracking Sheet shall be used to document appropriate information. Potential illicit discharges reported by citizens should be reviewed on an annual basis to locate patterns of illicit discharges, identify high-priority catchments, and evaluate the call-in inspection program. 21.0 INDICATORS OF IDDE PROGRAM PROGRESS AND REPORTING The progress and effectiveness of the IDDE program will be evaluated and reported on in each annual report. The success of the IDDE program will be measured by the IDDE activities completed within the required MS4 permit timelines. Indicators and documentation for tracking the program success will include: ∂ The MATRIX, updated annually with data collected as part of catchment investigations ∂ All dry and wet weather screening and sampling results ∂ Reports on actions taken, SSOs and illicit connection identified and removed, and the estimated volume of sewage removed ∂ The number and percent of total City-owned MS4 catchment areas evaluated using the IDDE program procedures ∂ Training records for frequency and type of employee training

18 APPENDIXAPPENDIX A – Stormwater A – Legal Outfall Authority Map EASTON WEST BRIDGEWATER

MANSFIELD City of Taunton, Massachusetts

T E E R T S L L I H T C E P S O R P Stormwater Outfall Locations Map Legend Outfall Use - 658 ¯ #* Commercial - 40 JOSEPH L QU INN DR I VE #* #* #* IndusBtRrIDiGaEWlA T-ER 11 IN W DU S T O #* R O #* L IA E D R D A #* L H P A A V A O Y R K R C #*I Municipal - 4 E H D #* W E E R D V L D I I V #* #* R U D R #* CR E NI #* AN B R I DI Z D #* E AV V D EN L UE I E R E N I Residential - 603 I O R N V V #* NORTON TH E N D E RR D #* #* #* TE IA N R JENNA R #*#*#* CI RCLE A V VE I I V E N DR #* #* I E L E#*R #* STREET U FIELD O #* B Data Source: City of Taunton and MassGIS H S I E D LAN Y M N ERR A YB A T BA #* Y S F Plot Date: September 28,2018 Scale: 1" = 1,200' S #* L LE O

Y W M D A D #* E R O R A R D V A A E V E I L N S I E Y U A N

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C A BA R L E #* NUM A #* S M A R TR EET #* D R T K #* #* N #* R O T O #* H JO E R R RE W D S A T P T H W S E #* E I E N N R E U V A E ST E R S D E I T M A IT O #* E U SS V S H C EN L E O O W V #* T V V E CR E #* E T N I #* A L F E T #* R I T E R E E R A S I A #* A L R #* ST E W T R A N E V RIVER STREET #*E R E #* I E D R A M C D C R T R N T E E #* E T E RE E U S E E O ST OR T T R E S V S V L G I T V U D F E E R T #* OO N E E T V I D S E W I T S RE N KY E E N N S ST S E R T R OC RE A S T A R D R W T H T D L T D E D #* S I E R AR T L IN R L O L R H S O E A CA RO L IV IL C V R E C L R E U H R E N B #* #* A E A E E O #* E #* T E T L A B I T E A V H R L G N E R P W T Y #* P #* A E #* #* E L C N R #* #* E I #* S I A A #* N O C K E B #* R T N C #* O V #* N I R U B R R E

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D #* L #* E Y I S I O E T E T C E L R A #* O O O E L T N R M B I #* V D E L E A #* T E A S E T #* R D ET R R RE S #* M #* ST E AY T R AN EW R S ET L T S N C T E A T N S E R KN O S #* U E R I E S T N E GH B S R T L T L T S D T #* R E S #* D G T R O E T R O H #* E O ET T I O C E H N #* D W A E D IR I W N Y H A G E O O N W C D E I #* #* L R #* K P A A IG O R E Y T S #* N C I D P T L R T T C O V R T F W T I I H R R A A O C E E ET A R N #* C B #* E L E N T E Y E TR E E T T T S L H #* L S T X #* R RE E D O E E TR E N AR O V N T E E H F E E S R E R T E H #* O P R R N O L T E U T E T E N R T S N A R E C I R A D N E D E E R N K R #* U X E S H H N F #*#* V O A U X O O #* A S E G T T X L U C D E E R A E T #* E D E #* R A I P S E E T E T L N O N H E #* R N U #* R T B #* E R V S T A G N L L T I O C U E V A A N E E R E I V S R V#* A E E L E I #* #* E E E A N R K E E N N A E #* A U T V #* T #* N #* V #*A L #*#* R U E C R E E #* E S N E A T T N A V L E M R #* E U V E S #* S E S E E U R M T I

F T W IF R #* #* V TH S S R K T R E R E R E I T A ET E E A I L D H E I S N #* V S T E E E L T O V T R #* T L T I A H G T L E #* R R R E E E U L R U #* E I N A IV C D W T R A E T T D B E S #* R U S O A S O R W A W N L X T S EN E T B L S T R O E S L KA L N R E T S F #* S T IV C #* E #* H A E Y R E #* #* B T D D N E I #* S A E I C T E R E I P #* T O N N O E L W E R E R U #* C R N P A L E T A N T L E T K E O E K R E S C D A T V V S T R S E A L A S S #* E L #* E T R E #* T T K O S V N T T E E #* B R E T A R O O E T B E T O A E E E R E #* N I T O V E N I Y M S S T R E A ID L R R R F A D R E U D T LE P T W E A B C T S E E #* S W OR E O L W ' #* L O R E P R F I V W E L F A R I I V I #* T D E E U #* J B N L #*#* S H U E N O E O C #* E E G N L I O A G Y T N E S N I A O E A H A U E Y P L U R T T TA R V G D C D C H #* T G #* #* #* D A L O #* S #* Y A D T E A L R A D R A E C S L A E O N W T #* R E L T O I A T O A B IV #*T I PE L #* V AN D R E R #* S R D O V I N E E S S AZA T #* T E #* D E R #* L E R O U R EE R S W E E L A O T A V I N T K N T I V R E T U S E D R #* E O EF E R E E A #* R D E O R S #* V T #* T E H I E N R V #* E V S E E B A L E O #* T E R #* L E T T T I N T R E M A E B #* B #* U P S W E A S C #* #* A E N K R H REHOBOTH E L E D E A R #* R R E #* R N N #* A N OA V A I #* D M A C E #* W L E Y A S U R W E O R T L S A O T S C R E J E B I E V E N E E W E R T #* N RI E N O N H O D J 'S R I EA Z L A P NI M Y P Z L T N O E L O IA E C E E D S IR #* E M L A #* CL R A R S I E S N I C B T I T B #* #* D #* R C R A #*N H #* O #* I K R D S K J I E U C H R E Y E C S S U M A C R T R E L B #* O T T Y T D M B A E D A R #* #* E E D N A IN #* T R E E E I C A A G R #*S #* T I O T E N E B #* R C T O T IV I #*S S I R R C #* R A D D Y L #* R L L E N A D DRIVE L O O I #* B N O O L E #* A D H U W N E N #* J C D R E A A E U Y #* S R L W V S A D A E M L L N L A I #* A E L S C D RY Y OV S T O A A E S REET R N M T#*RE N W E #* D T W O D A A N V Y E R C I O I V K #* #* L P I I B L ME N G #* A R LLO S F #* #* #*S D A D RM G R #* #* #* R OA Y D #* N #* I I E D V K E L E P B T O R #* E C A E R #* D T #* S R #* VE I N I S RIVE V R T D D E A C O E D L O R #* EA RY F L N P LAKEVILLE L W A E W S #* S S #* #* T R #* S E O #* E #* T U EE T STR T SO TH H U R H EV M P I E R R O G A L T E #* U H I #* A LR C O T S I C I

A O N T D N O A A C O V M T EN RY N U E S D T E E P R R T E I O E S V A T T E V W R E H E T N TURNE STRE ET R E UR A U S T CO T E T N C T R

O A #* NS O A I N TT T W E L N B E B #* D I Y N E R #* R S T A R I E T V Y D E W R E R L L A T I A E S A #* O L A N R E L Y R #* T #* R D #* E AY E IV W K S W ER E L C E T I D FI B E A O S D AV U N #* M T A D F U L F P I D A T O U Y O A R L A KR M O ID O W O GE S W A DIGHTON D R D R IV W #* E E L D R D A I V ID Y F #* E M C A H C ES O HI R IVE M E D R #* B R RISON E O RO A R M D TY S N #* T A R N K A E V I N E EN T UE G M

BERKLEY N

S T T EE R R E T E S AY T W LO L S HO S A

P Y B T E E E N R A T L S

L Y I A J D W O J O O L O S F L S H ET F H U O A E A U R H L T D A A C S N S L L A E K A C N I I R R E Y E M

E APPENDIX B – Outfall & Interconnection InventoryAPPENDIX and A – Priority Legal Authority Ranking Appendix B - Outfall Inventory and Priority Ranking Matrix - IDDE Plan Taunton, Massachusetts Revision: 06/18/2019

Discharging to Previous Screening Results Frequency of Past Area of Concern Receiving Water Density of Generating Age of Development Historic Combined Aging Culverted Outfall ID Receiving Water Indicate Likely Sewer Discharge 3 4 5 6 7 8 Additional Characteristics Score Priority Ranking 1 to Public Health Quality Sites and Infrastructure Sewers or Septic? Septic Streams Input? 2 Complaints

Outfall Inspections and Land Use Information, City Staff (DPW), GIS Land Use, GIS and Storm Information Source GIS Maps Taunton DPW Impaired Waters List Land Use/GIS Maps Sample Results Visual Observations Maps DPW Staff System Maps Frequent = 3 Poor = 3 High = 3 Medium High = 3 Yes = 3 (Problem Outfall) Yes = 3 Yes = 3 No Yes = 3 Yes = 3 Scoring Criteria Occassional = 2 Fair =2 = 2 Medium = 2 No = 0 No = 0 =0 No =0 No =0 None = 0 Good = 0 Low= 1 Low- 1 30-1 Watson Pond 0 3 0 3 1 1 0 0 0 8 High 31-1 Lake Sabbattia 0 3 0 3 1 1 0 0 0 8 High 31-3 Snake River/Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 31-4 Snake River/Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 31-8 Watson Pond 0 3 0 3 1 1 0 0 0 8 High 38-1 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 38-2 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 38-3 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 40-1 Wetland/Lake Sabbatia 0 0 0 3 1 2 0 0 0 6 Low 40-2 Wetland 0 0 0 0 1 1 0 0 0 Discharges to open wetland 2 Low 43-2 Stream/Three Mile River 0 3 0 3 3 1 0 0 0 10 High 43-3 Stream/Three Mile River 0 3 0 3 3 1 0 0 0 10 High 45-1 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 45-2 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 45-3 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 45-4 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 45-5 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 45-6 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 45-7 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 46-1Prospect Hill Pond/Kings Pond/Taunton River 0 0 0 0 1 1 0 0 0 2 Low 46-2 Wetland/Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 46-3 Wetland/Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 46-6 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 46-7 Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 50-2 Three Mile River 0 0 0 2 1 1 0 0 0 4 Low 50-4 Three Mile River 0 0 0 3 3 3 0 0 0 9 Problem 51-2 Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 51-3 Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 52-1 Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 52-2 Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 52-3 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 52-4 Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 52-5 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 52-6 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 52-7 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 53-1 Pond/Lake Sabbattia 0 0 0 3 1 1 0 0 0 5 Low 53-2 Pond/Lake Sabbattia 0 0 0 3 1 1 0 0 0 5 Low 53-4 Black Pond/Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low Appendix B - Outfall Inventory and Priority Ranking Matrix - IDDE Plan Taunton, Massachusetts Revision: 06/18/2019

Outfall Inspections and Land Use Information, City Staff (DPW), GIS Land Use, GIS and Storm Information Source GIS Maps Taunton DPW Impaired Waters List Land Use/GIS Maps Sample Results Visual Observations Maps DPW Staff System Maps Frequent = 3 Poor = 3 High = 3 Medium High = 3 Yes = 3 (Problem Outfall) Yes = 3 Yes = 3 No Yes = 3 Yes = 3 Scoring Criteria Occassional = 2 Fair =2 = 2 Medium = 2 No = 0 No = 0 =0 No =0 No =0 None = 0 Good = 0 Low= 1 Low- 1 53-5 Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 53-6 Lake Sabbatia 0 0 0 3 1 2 0 0 0 Buried Structure 6 Low 54-1 Wetland 0 0 0 0 1 1 0 0 0 2 Low 56-4 Three Mile River 3 0 0 3 1 2 0 0 0 9 Problem 56-5 Wetland/Three Mile River 3 0 0 3 1 1 0 0 0 8 Problem 57-3 Wetland/Three Mile River 3 0 0 3 1 2 0 0 0 9 Problem 59-1 Ponds 0 0 0 0 1 1 0 0 0 2 Low 59-2 Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 59-3 Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 60-1 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 60-2 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 60-3 Lake Sabbatia 0 3 0 3 1 1 0 0 0 8 High 61-5Prospect Hill Pond/Kings Pond/Taunton River 0 0 0 0 1 1 0 0 0 2 Low 62-1 Lake Sabbattia 0 0 0 3 1 1 3 0 0 Trailer Park; no sewer connection 8 Low 63-3 Three Mile River 0 0 0 0 1 1 0 0 0 2 Low 63-4 Three Mile River 0 0 0 0 1 1 0 0 0 2 Low 64-1 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 64-3 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 64-7 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 65-1 Three Mile River 0 0 0 2 1 1 0 0 0 4 Low 65-2 Three Mile River 0 0 0 2 1 1 0 0 0 4 Low 66-12 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 66-8 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 73-2 Three Mile River 0 0 0 2 1 1 0 0 0 4 Low 73-9 Three Mile River 0 0 0 2 1 1 0 0 0 4 Low 74-2 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 74-4 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 75-2 Three Mile River 0 0 0 2 1 1 0 0 0 4 Low 79-11 Mill River 3 3 0 2 1 1 0 0 0 10 Problem 79-12 Mill River 3 3 0 2 1 1 0 0 0 10 Problem 79-2 Mill River 0 0 0 2 1 1 0 0 0 4 Low 79-3 Mill River 3 3 0 2 1 1 0 0 0 10 Problem 79-4 Mill River 3 3 0 2 1 1 0 0 0 10 Problem 79-5 Mill River 3 3 0 2 1 1 0 0 0 10 Problem 79-6 Mill River 3 3 0 2 1 1 0 0 0 10 Problem 79-7 Mill River 3 3 0 2 1 1 0 0 0 Half Under River 10 Problem 79-8 Mill River 0 0 0 2 1 1 0 0 0 4 Low 79-9 Mill River 0 0 0 2 1 1 0 0 0 4 Low Appendix B - Outfall Inventory and Priority Ranking Matrix - IDDE Plan Taunton, Massachusetts Revision: 06/18/2019

Outfall Inspections and Land Use Information, City Staff (DPW), GIS Land Use, GIS and Storm Information Source GIS Maps Taunton DPW Impaired Waters List Land Use/GIS Maps Sample Results Visual Observations Maps DPW Staff System Maps Frequent = 3 Poor = 3 High = 3 Medium High = 3 Yes = 3 (Problem Outfall) Yes = 3 Yes = 3 No Yes = 3 Yes = 3 Scoring Criteria Occassional = 2 Fair =2 = 2 Medium = 2 No = 0 No = 0 =0 No =0 No =0 None = 0 Good = 0 Low= 1 Low- 1 84-1 Three Mile River 0 0 0 2 1 1 0 0 0 4 Low 84-4 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 85-1 Three Mile River/Wetland 0 0 0 0 1 1 0 0 0 Discharges to open wetland area 2 Low 85-2 Three Mile River 0 0 0 2 1 1 0 0 0 4 Low 85-6 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 85-8 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 87-1 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 88-3 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 88-4 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 90-1 Mill River 0 0 0 2 1 1 0 0 0 4 Low 90-10 Mill River 0 0 0 2 1 1 0 0 0 4 Low 90-11 Mill River 0 0 0 2 1 1 0 0 0 4 Low 90-12 Mill River 0 0 0 2 1 1 0 0 0 4 Low 90-2 Wetland/Mill River 0 0 0 2 1 3 0 0 0 6 Low 90-3 Mill River 0 3 0 2 1 1 0 0 0 7 High 90-4 Mill River 0 3 0 2 1 1 0 0 0 7 High 90-5 Mill River 0 0 0 2 1 1 0 0 0 4 Low 90-6 Mill River 0 0 0 2 2 1 0 0 0 5 Low 90-7 Mill River 0 0 0 2 1 1 0 0 0 4 Low 90-8 Mill River 0 0 0 2 1 2 0 0 0 5 Low 90-9 Mill River 0 0 0 2 1 1 0 0 0 4 Low 92-1 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 92-4 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 92-5 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 92-6 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 100-2 Wetland/Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 101-1 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 101-2 Wetland/Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 101-3 Wetland/Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 101-4 Wetland/Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 102-1 Pond/Mill River 0 0 0 2 1 1 0 0 0 4 Low 102-2 Mill River 0 0 0 2 1 3 0 0 0 6 Low 103-1 Mill River 0 3 0 2 1 1 0 0 0 7 High 103-2 Mill River 0 3 0 3 3 2 0 0 0 11 High 103-3 Mill River 0 3 0 2 1 1 0 0 0 7 High 104-2 Taunton River 0 3 0 3 1 1 0 0 0 8 High 104-3 Taunton River 0 3 0 3 1 1 0 0 0 8 High 108-1 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 108-2 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 108-3 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low Appendix B - Outfall Inventory and Priority Ranking Matrix - IDDE Plan Taunton, Massachusetts Revision: 06/18/2019

Outfall Inspections and Land Use Information, City Staff (DPW), GIS Land Use, GIS and Storm Information Source GIS Maps Taunton DPW Impaired Waters List Land Use/GIS Maps Sample Results Visual Observations Maps DPW Staff System Maps Frequent = 3 Poor = 3 High = 3 Medium High = 3 Yes = 3 (Problem Outfall) Yes = 3 Yes = 3 No Yes = 3 Yes = 3 Scoring Criteria Occassional = 2 Fair =2 = 2 Medium = 2 No = 0 No = 0 =0 No =0 No =0 None = 0 Good = 0 Low= 1 Low- 1 108-4 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 110-1 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 110-2 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 111-3 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 112-3 Pond/Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 112-4 Wetland/ Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 113-1 Wetland/Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 113-2 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 113-4 Cobb Brook 0 3 0 0 1 1 0 0 0 5 Low 113-5 Cobb Brook 0 3 0 0 1 1 0 0 0 5 Low 113-6 Cobb Brook 0 3 0 0 1 1 0 0 0 5 Low 114-10 Mill River 0 0 0 2 2 1 0 0 0 5 Low 114-4 Mill RIver 0 0 0 2 1 1 0 0 0 4 Low 114-8 Mill River 0 0 0 2 1 1 0 0 0 4 Low 114-9 Mill River 0 0 0 2 1 3 0 0 0 Destroyed 6 Excluded 116-2 Taunton River 0 3 0 3 1 1 0 0 0 8 High 117-1 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 117-2 Marsh/Taunton River 0 0 0 3 2 2 0 0 0 7 High 117-4 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 117-5 Taunton River 0 0 0 3 1 2 0 0 0 6 Low 117-8 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 117-9 Taunton River 0 0 0 3 2 1 0 0 0 6 Low 259-2 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 126-1 Wetland/Three Mile River 0 0 0 3 1 1 0 0 0 Could Not Locate 5 Excluded 128-1 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 128-10 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 128-4 Cobb Brook 0 0 0 0 1 2 0 0 0 3 Low 128-5 Cobb Brook 0 0 0 0 1 1 0 0 3 5 Low 128-6 Wetland/Cobb Brook 0 0 0 0 1 2 0 0 0 3 Low 128-7 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 128-8 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 128-9 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 129-1 Mill River 3 0 0 2 1 1 0 0 0 7 Problem 130-1 Mill River 0 0 0 2 2 2 0 0 0 6 Low 130-10 Mill River 0 0 0 2 3 1 0 0 0 6 Low 130-11 Mill RIver 0 0 0 2 3 1 0 0 0 6 Low 130-12 Mill RIver 0 0 0 2 3 1 0 0 0 6 Low 130-13 Mill RIver 0 0 0 2 3 1 0 0 0 6 Low 130-14 Mill RIver 0 0 0 2 3 1 0 0 0 6 Low 130-15 Mill River 0 0 0 2 1 0 0 0 3 Low 130-16 Mill River 0 0 0 2 1 3 0 0 0 6 Low 130-17 Mill RIver 0 0 0 2 1 1 0 0 0 4 Low 130-18 Mill RIver 0 0 0 2 3 1 0 0 0 6 Low 130-19 Mill RIver 0 0 0 2 3 1 0 0 0 6 Low 130-2 Mill River 0 0 0 2 1 2 0 0 0 5 Low Appendix B - Outfall Inventory and Priority Ranking Matrix - IDDE Plan Taunton, Massachusetts Revision: 06/18/2019

Outfall Inspections and Land Use Information, City Staff (DPW), GIS Land Use, GIS and Storm Information Source GIS Maps Taunton DPW Impaired Waters List Land Use/GIS Maps Sample Results Visual Observations Maps DPW Staff System Maps Frequent = 3 Poor = 3 High = 3 Medium High = 3 Yes = 3 (Problem Outfall) Yes = 3 Yes = 3 No Yes = 3 Yes = 3 Scoring Criteria Occassional = 2 Fair =2 = 2 Medium = 2 No = 0 No = 0 =0 No =0 No =0 None = 0 Good = 0 Low= 1 Low- 1 130-200 Mill River 0 0 0 2 1 1 0 0 0 4 Low 130-3 Mill River 0 0 0 2 1 1 0 0 0 4 Low 130-4 Mill River 0 0 0 2 1 1 0 0 0 4 Low 130-5 Mill River 0 0 0 2 1 1 0 0 0 4 Low 130-6 Mill RIver 0 0 0 2 2 1 0 0 0 5 Low 130-7 Mill River 0 0 0 2 2 2 0 0 0 6 Low 130-8 Mill River 0 0 0 2 2 1 0 0 0 5 Low 130-9 Mill RIver 0 0 0 2 3 1 0 0 0 6 Low 131-1 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-10 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-11 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-12 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-13 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-14 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-15 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-16 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-17 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-18 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-19 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-2 Taunton River 0 0 0 3 1 3 0 0 0 7 Low 131-20 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-21 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-3 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-4 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-5 Taunton River 0 0 0 3 1 3 0 0 0 7 Low 131-6 Taunton River 0 0 0 3 1 2 0 0 0 6 Low 131-7 Taunton River 0 0 0 3 1 2 0 0 0 6 Low 131-8 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 131-9 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 133-1 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 133-2 Wetland/Taunton River 0 0 0 3 1 1 0 0 0 5 Low 133-3 Wetland/Taunton River 0 0 0 3 1 1 0 0 0 5 Low 133-5 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 139-2 Segreganset River 0 3 0 2 1 1 0 0 0 7 High 144-1 Wetland/Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 144-2 Wetland/Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 144-3 Wetland/Cobb Brook 0 0 0 0 1 2 0 0 0 3 Low 144-4 Wetland/Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 144-6 Wetland/Three Mile River 0 0 0 3 1 2 0 0 0 6 Low 144-7 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 144-8 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 146-10 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 146-11 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 146-4 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 146-5 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low Appendix B - Outfall Inventory and Priority Ranking Matrix - IDDE Plan Taunton, Massachusetts Revision: 06/18/2019

Outfall Inspections and Land Use Information, City Staff (DPW), GIS Land Use, GIS and Storm Information Source GIS Maps Taunton DPW Impaired Waters List Land Use/GIS Maps Sample Results Visual Observations Maps DPW Staff System Maps Frequent = 3 Poor = 3 High = 3 Medium High = 3 Yes = 3 (Problem Outfall) Yes = 3 Yes = 3 No Yes = 3 Yes = 3 Scoring Criteria Occassional = 2 Fair =2 = 2 Medium = 2 No = 0 No = 0 =0 No =0 No =0 None = 0 Good = 0 Low= 1 Low- 1 146-6 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 146-7 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 146-8 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 147-1 Mill River 0 0 0 2 1 3 0 0 0 6 Low 148-1 Mill River 3 0 0 2 2 0 0 0 7 High 148-2 Mill River 3 0 0 2 1 1 0 0 0 7 Problem 148-3 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 148-4 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 149-2 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 149-9 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 150-1 Wetland/Taunton River 0 0 0 3 1 1 0 0 0 Discharges to unnamed pond 5 Low 150-2 Taunton River 0 0 0 3 1 1 0 0 0 Discharges to unnamed pond 5 Low 161-3 Wetland/Cobb Brook 0 0 0 0 1 2 0 0 0 3 Low 161-4 Three Mile River 0 0 0 3 1 2 0 0 0 6 Low 161-5 Wetland/Three Mile 0 0 0 3 1 1 0 0 0 5 Low 161-6 Wetland/Three Mile 0 0 0 3 1 1 0 0 0 5 Low 161-8 Wetland/Three Mile 0 0 0 3 1 1 0 0 0 5 Low 161-9 Wetland/Three Mile 0 0 0 3 1 1 0 0 0 5 Low 162-3 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 163-4 Cobb Brook 0 3 0 0 1 1 0 0 0 5 High 163-5 Cobb Brook 0 3 0 0 1 1 0 0 0 5 High 163-6 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 163-7 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 163-8 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 165-1 Wetland / Taunton River 3 0 0 3 1 2 0 0 0 9 Problem 166-2 Wetland/Taunton River 0 0 0 3 1 1 0 0 0 Discharges to unnamed pond 5 Low 167-5 Pond/Tauton River 0 0 0 3 1 1 0 0 0 Discharges to unnamed pond 5 Low 168-1 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 168-2 Wetland/Taunton River 0 0 0 3 1 1 0 0 0 5 Low 168-3 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 179-1 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 179-2 Three Mile River 0 0 0 2 2 2 0 0 0 6 Low 181-1 Wetland/Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 181-4 Pond/Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 182-2 Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 182-4 Wetland/Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 183-1 Taunton River 0 0 0 3 2 3 0 0 0 8 High 183-2 Taunton River 0 0 0 3 3 1 0 0 0 7 High 183-3 Mill River 3 0 0 2 3 1 0 0 0 9 Problem 183-4 Taunton River 3 0 0 3 1 1 0 0 0 8 Problem 183-5 Taunton River 0 0 0 3 3 1 0 0 0 7 High 183-6 Taunton River 0 0 0 3 3 2 3 0 0 11 Problem 184-3 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 185-4 Wetland/Taunton River 0 0 0 3 1 3 0 0 0 7 Low 186-1 Wetland/Cotley River 0 0 0 0 1 3 0 0 0 4 Low Appendix B - Outfall Inventory and Priority Ranking Matrix - IDDE Plan Taunton, Massachusetts Revision: 06/18/2019

Outfall Inspections and Land Use Information, City Staff (DPW), GIS Land Use, GIS and Storm Information Source GIS Maps Taunton DPW Impaired Waters List Land Use/GIS Maps Sample Results Visual Observations Maps DPW Staff System Maps Frequent = 3 Poor = 3 High = 3 Medium High = 3 Yes = 3 (Problem Outfall) Yes = 3 Yes = 3 No Yes = 3 Yes = 3 Scoring Criteria Occassional = 2 Fair =2 = 2 Medium = 2 No = 0 No = 0 =0 No =0 No =0 None = 0 Good = 0 Low= 1 Low- 1 187-1 Cotley River 0 0 0 0 1 1 0 0 0 2 Low 187-2 Cotley River 0 0 0 0 1 1 0 0 0 2 Low 187-3 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 188-1 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 188-2 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 190-4 Wetland/Taunton River 0 0 0 3 1 1 0 0 0 5 Low 199-1 Three Mile River 0 0 0 3 1 2 0 0 0 6 Low 199-2 Three Mile River 0 0 0 3 1 1 0 0 3 8 High 199-3 Three Mile River 0 0 0 3 1 1 0 0 3 8 High 199-4 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 199-5 Three Mile River 0 0 0 3 1 2 0 0 0 6 Low 199-6 Three Mile River 0 0 0 3 1 2 0 0 0 6 Low 199-7 Three Mile River 0 0 0 3 1 1 0 0 0 5 Low 202-2 Wetland/Cobb Brook 0 0 0 0 1 1 0 0 0 2 Low 202-4 Taunton River 0 0 0 3 1 2 0 0 0 6 Low 202-5 Taunton River 0 0 0 3 3 1 0 0 0 7 High 202-6 Cobb Brook 0 0 0 2 1 1 3 0 0 7 Low 202-7 Cobb Brook 0 0 0 2 1 1 3 0 0 7 Low 203-2 Taunton River 0 0 0 3 3 1 3 0 0 10 Problem 203-3 Taunton River 0 0 0 3 3 2 3 0 0 11 Problem 203-4 Taunton River 0 0 0 3 3 1 3 0 0 10 Problem 203-6 Taunton River 0 0 0 3 3 1 3 0 0 10 High 203-7 Taunton River 0 0 0 3 3 1 3 0 0 10 Problem 209-1 Wetland/Richmond Pond 0 0 0 0 1 1 0 0 0 2 Low 219-6 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 221-1 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 221-2 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 221-3 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 221-4 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 227-2 Stream/Richmond Pond 0 0 0 2 1 1 0 0 0 4 Low 227-3 Richmond Pond 0 0 0 0 1 1 0 0 0 2 Low 235-1 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 238-5 Cotley River 0 0 0 0 2 2 0 0 0 4 Low 240-1 Wetland/Richmond Pond 0 0 0 0 1 1 0 0 0 2 Low 240-6 Wetland/Richmond Pond 0 0 0 2 1 1 0 0 0 4 Low 240-8 Pond/Richmond Pond 0 0 0 2 1 1 0 0 0 4 Low 240-9 Richmond Pond 0 0 0 0 1 1 0 0 0 No sewer connection nearby 2 Excluded 246-1 Three Mile River 0 0 0 3 3 1 0 0 0 7 High 246-3 Three Mile River 0 0 0 3 3 1 0 0 0 7 High 250-2 Cotley River 0 0 0 0 2 3 0 0 0 5 Low 250-3 Cotley River 0 0 0 0 2 1 0 0 0 3 Low 25-2 Snake River/Lake Sabbatia 0 0 0 3 1 1 0 0 0 5 Low 259-1 Taunton River 0 0 0 3 1 1 0 0 0 5 Low 259-2 Cobb Brook River 0 0 0 0 1 1 0 0 0 2 Low 296 Appendix B - Outfall Inventory and Priority Ranking Matrix - IDDE Plan Taunton, Massachusetts Revision: 06/18/2019

Outfall Inspections and Land Use Information, City Staff (DPW), GIS Land Use, GIS and Storm Information Source GIS Maps Taunton DPW Impaired Waters List Land Use/GIS Maps Sample Results Visual Observations Maps DPW Staff System Maps Frequent = 3 Poor = 3 High = 3 Medium High = 3 Yes = 3 (Problem Outfall) Yes = 3 Yes = 3 No Yes = 3 Yes = 3 Scoring Criteria Occassional = 2 Fair =2 = 2 Medium = 2 No = 0 No = 0 =0 No =0 No =0 None = 0 Good = 0 Low= 1 Low- 1 Scoring Criteria: 1. Previous screening results indicate likely sewer input if any of the following are true: · Olfactory or visual evidence of sewage, · Ammonia : 0.5 mg/L, surfactants: 0.25 mg/L, and bacteria levels greater than the water quality criteria applicable to the receiving water, or · Ammonia : 0.5 mg/L, surfactants: 0.25 mg/L, and detectable levels of chlorine 2. Outfalls/interconnections that discharge to or in the vicinity of any of the following areas: public beaches, recreational areas, drinking water supplies, or shellfish beds 3. Receiving water quality based on latest version of MassDEP Integrated List of Waters. · Poor = Waters with approved TMDLs (Category 4a Waters) where illicit discharges have the potential to contain the pollutant identified as the cause of the impairment · Fair = Water quality limited waterbodies that receive a discharge from the MS4 (Category 5 Waters) · Good = No water quality impairments 4. Generating sites are institutional, municipal, commercial, or industrial sites with a potential to contribute to illicit discharges (e.g., car dealers, car washes, gas stations, garden centers, industrial manufacturing, etc.) 5. Age of development and infrastructure: · High = Industrial areas greater than 40 years old and areas where the sanitary sewer system is more than 40 years old · Medium = Developments 20-40 years old · Low = Developments less than 20 years old 6. Areas once served by combined sewers and but have been separated, or areas once served by septic systems but have been converted to sanitary sewers. 7. Aging septic systems are septic systems 30 years or older in residential areas. 8. Any river or stream that is culverted for distance greater than a simple roadway crossing. 9. Problem Outfalls - Denoted by Previous Screening Results and/or Score > 6 10. High Priority Outfalls - Denoted by Score ≥ 5 without a previous screening result indicating sewer input. 11. Low Priority Outfalls - Denoted by Score < 5 12. Excluded Outfalls - Outfalls/interconnections that have no potential for illicit discharges; drainage for athletic fields, parks or undeveloped green space and associated parking without services; cross-country drainage alignments. Problem High Priority Excluded Low Priority APPENDIX C – IDDE Composite Ranking and APPENDIXSampling A – Legal Locations Authority Map P M A W S

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o t o r n o C o R k iv e r APPENDIX D- Screening/Sampling Standard Operating Procedures and Forms Screening/Sampling Standard Operating Procedures and Forms

1.0 Before Field Inspection and Sampling

The dry and wet weather outfall inspection and sampling procedure consists of the following general steps: 1. Identify outfall(s) to be screened/sampled based on initial outfall inventory and priority ranking 2. Acquire the necessary staff, mapping, and field equipment (see Table 2-1 for list of potential field equipment) 3. Determine weather conditions: Dry weather conditions – anything less than 0.1 inches of rain within 24 hours of a precipitation event or snowmelt. 4. Contact the lab at least one day prior to field sampling. The lab should prepare and supply the appropriate microbiology (bacteria) sampling bottleware. 5. Obtain the appropriate sampling equipment required for in-situ analysis (i.e. test kits, and handheld multi-meter devices).

2.0 Field Sampling 1. Conducting the outfall inspection during both dry and weather inspection: a. Mark and photograph the outfall b. Record the inspection information and outfall characteristics (using paper forms or digital form using a tablet or similar device) (see attached form) c. Look for and record visual/olfactory evidence of pollutants in flowing outfalls including odor, color, turbidity, and floatable matter (suds, bubbles, excrement, toilet paper or sanitary products). Also observe outfalls for deposits and stains, vegetation, and damage to outfall structures. 6. If flow is observed, sample and test the flow following the procedures described in the following sections. 7. If no flow is observed, but evidence of illicit flow exists (illicit discharges are often intermittent or transitory), revisit the outfall during dry weather within one week of the initial observation, if practicable, to perform a second dry weather screening and sample any observed flow. Other techniques can be used to detect intermittent or transitory flows including conducting inspections during evenings or weekends and using optical brighteners. 8. Input results from screening and sampling into spreadsheet/database. Include pertinent information in the outfall/interconnection inventory and priority ranking. 9. Include all screening data in the annual report.

Previous outfall screening/sampling conducted under the 2013 MS4 Permit may be used to satisfy the dry weather outfall/screening requirements of the 2016 MS4 Permit only if the previous screening and sampling was substantially equivalent to that required by the 2016 MS4 Permit, including the list of analytes outlined in Section 2.3.4.7.b.iii.4 of the 2016 permit.

2.1 Field Sampling Equipment

Table 2-1 lists field equipment commonly used for dry weather outfall screening and sampling. Screening/Sampling Standard Operating Procedures and Forms

Table 2-1. Field Equipment – Dry Weather Outfall Screening and Sampling Equipment Use/Notes

Clipboard For organization of field sheets and writing surface Field Sheets Field sheets for both dry weather inspection and Dry weather sampling should be available with extras Chain of Custody Forms To ensure proper handling of all samples Pens/Pencils/Permanent Markers For proper labeling Nitrile Gloves To protect the sampler as well as the sample from contamination Flashlight/headlamp w/batteries For looking in outfalls or manholes, helpful in early mornings as well Cooler with Ice For transporting samples to the laboratory Digital Camera For documenting field conditions at time of inspection Personal Protective Equipment Reflective vest, Safety glasses and boots at a minimum (PPE) GPS Receiver For taking spatial location data Water Quality Sonde If needed, for sampling conductivity, temperature, pH Water Quality Meter Hand held meter, if available, for testing for various water quality parameters such as ammonia, surfactants and chlorine Test Kits Have extra kits on hand to sample more outfalls than are anticipated to be screened in a single day Label Tape For labeling sample containers Sample Containers Make sure all sample containers are clean. Keep extra sample containers on hand at all times. Make sure there are proper sample containers for what is being sampled for (i.e., bacteria requires sterile containers). Pry Bar or Pick For opening catch basins and manholes when necessary Sandbags For damming low flows in order to take samples Small Mallet or Hammer Helping to free stuck manhole and catch basin covers Utility Knife Multiple uses Measuring Tape Measuring distances and depth of flow Safety Cones Safety Hand Sanitizer Disinfectant/decontaminant Zip Ties/Duct Tape For making field repairs Rubber Boots/Waders For accessing shallow streams/areas Sampling Pole/Dipper/Sampling For accessing hard to reach outfalls and manholes Cage Screening/Sampling Standard Operating Procedures and Forms

2.2 Field Sampling Equipment

If flow is present during a dry weather outfall inspection, a sample will be collected and analyzed for the required permit parameters1 listed in Table 2-2. The general procedure for collection of outfall samples is as follows:

1. Fill out all sample information on sample bottles and field sheets (see attached inspection form) 2. Put on protective gloves (nitrile/latex/other) before sampling 3. Collect sample with dipper or directly in sample containers. If possible, collect water from the flow directly in the sample bottle. Be careful not to disturb sediments. 4. If using a dipper or other device, triple rinse the device with distilled water and then in water to be sampled (not for bacteria sampling) 5. Use test strips, test kits, and field meters (rinse similar to dipper) for most parameters (see Table 2-1) 6. Place laboratory samples on ice for analysis of bacteria and pollutants of concern 7. Fill out chain-of-custody form for laboratory samples 8. Deliver samples to ##NAME OF LABORATORY(s) 9. Dispose of used test strips and test kit ampules properly 10. Decontaminate all testing personnel and equipment

In the event that an outfall is submerged, either partially or completely, or inaccessible, field staff will proceed to the first accessible upstream manhole or structure for the observation and sampling and report the location with the screening results. Field staff will continue to the next upstream structure until there is no longer an influence from the receiving water on the visual inspection or sampling.

Field test kits or field instrumentation are permitted for all parameters except indicator bacteria and any pollutants of concern. Field kits need to have appropriate detection limits and ranges. Table 2-1 lists various field test kits and field instruments that can be used for outfall sampling associated with the 2016 MS4 Permit parameters, other than indicator bacteria and any pollutants of concern. Analytic procedures and user’s manuals for field test kits and field instrumentation are provided in Appendix D.

Table 2-1. Sampling Parameters and Analysis Methods

Analyte or Parameter Instrumentation (Portable Meter) Field Test Kit Ammonia CHEMetrics™ V-2000 Colorimeter CHEMetrics™ K-1410 Hach™ DR/890 Colorimeter CHEMetrics™ K-1510 (series) Hach™ Pocket Colorimeter™ II Hach™ NI-SA Hach™ Ammonia Test Strips Surfactants CHEMetrics™ I-2017 CHEMetrics™ K-9400 and K- (Detergents) 9404 Hach™ DE-2 Chlorine CHEMetrics™ V-2000, K-2513 NA Hach™ Pocket Colorimeter™ II

1 Other potentially useful parameters, although not required by the MS4 Permit, include fluoride (indicator of potable water sources in areas where water supplies are fluoridated), potassium (high levels may indicate the presence of sanitary wastewater), and optical brighteners (indicative of laundry detergents). Screening/Sampling Standard Operating Procedures and Forms

Analyte or Parameter Instrumentation (Portable Meter) Field Test Kit Conductivity CHEMetrics™ I-1200 NA YSI Pro30 YSI EC300A Oakton 450

Temperature YSI Pro30 NA YSI EC300A Oakton 450 Salinity YSI Pro30 NA YSI EC300A Oakton 450 Temperature YSI Pro30 NA YSI EC300A Oakton 450 Indicator Bacteria: EPA certified laboratory procedure (40 CFR § NA E. coli (freshwater) or 136) Enterococcus (saline water) Total Nitrogen1 SM4500NO3-F Total Phosphorus1 Pollutants of Concern1 EPA certified laboratory procedure (40 CFR § NA 136) 1 Where the discharge is directly into a water quality limited water or a water subject to an approved TMDL, the sample must be analyzed for the pollutant(s) of concern identified as the cause of the water quality impairment.

Testing for indicator bacteria and any pollutants of concern must be conducted using analytical methods and procedures found in 40 CFR § 136.2 Samples for laboratory analysis must also be stored and preserved in accordance with procedures found in 40 CFR § 136. Table 2-2 lists analytical methods, detection limits, hold times, and preservatives for laboratory analysis of dry weather sampling parameters.

Table 2-2 Required Analytical Methods, Detection Limits, Hold Times, and Preservatives4

2 40 CFR § 136: http://www.ecfr.gov/cgi-bin/text- idx?SID=b3b41fdea0b7b0b8cd6c4304d86271b7&mc=true&node=pt40.25.136&rgn=div5 Screening/Sampling Standard Operating Procedures and Forms

Max. Hold Analyte or Parameter Analytical Method Detection Limit Preservative Time

Ammonia EPA: 350.2, SM: 4500- 0.05 mg/L 28 days Cool ≤6°C, H2SO4 NH3C to pH <2, No preservative required if analyzed immediately Surfactants SM: 5540-C 0.01 mg/L 48 hours Cool ≤6°C Chlorine SM: 4500-Cl G 0.02 mg/L Analyze within None Required 15 minutes Temperature SM: 2550B NA Immediate None Required Specific Conductance EPA: 120.1, SM: 2510B 0.2 µs/cm 28 days Cool ≤6°C Salinity SM: 2520 - 28 days Cool ≤6°C Indicator Bacteria: E.coli E.coli 8 hours Cool ≤10°C, E.coli EPA: 1603 EPA: 1 cfu/100mL 0.0008% Na2S2O3 Enterococcus SM: 9221B, 9221F , 9223 B SM: 2 MPN/100mL Other: Colilert ®, Colilert- Other: 1 MPN/100mL 18® Enterococcus Enterococcus EPA: 1 cfu/100mL EPA: 1600 SM: 1 MPN/100mL SM: 9230 C Other: 1 MPN/100mL Other: Enterolert®

Total Phosphorus EPA: Manual-365.3, EPA: 0.01 mg/L 28 days Cool ≤6°C, H2SO4 Automated Ascorbic acid SM : 0.01 mg/L to pH <2 digestion-365.1 Rev. 2, ICP/AES4-200.7 Rev. 4.4

SM: 4500-P E-F Total Nitrogen EPA: Cadmium reduction EPA: 0.05 mg/L 28 days Cool ≤6°C, H2SO4 (Ammonia + (automated)-353.2 Rev. SM : 0.05 mg/L to pH <2 Nitrate/Nitrite, methods 2.0, SM: 4500-NO3 E-F are for Nitrate-Nitrite and need to be combined with Ammonia listed above.) SM = Standard Methods Screening/Sampling Standard Operating Procedures and Forms

2.3 Intepreting Outfall Sampling Results

Outfall analytical data from dry weather sampling can be used to help identify the major type or source of discharge. Table 2-3 shows values identified by the U.S. EPA, the Center for Watershed Protection as typical screening values for select parameters, and the values to meet the require TMDL and values required for the pollutants of concern. These represent the typical concentration (or value) of each parameter expected to be found in stormwater. Screening values that exceed these benchmarks may be indicative of pollution and/or illicit discharges.

Table 2-3. Benchmark Field Measurements for Select Parameters

Analyte or Parameter Benchmark/Threshold Values

pH 6.5≤ x ≤8.3 S.U.

Ammonia >0.5 mg/L Conductivity >2,000 μS/cm Surfactants >0.25 mg/L Chlorine1 >0.02 mg/L (detectable levels per the 2016 MS4 Permit) Indicator Bacteria3: E.coli: the geometric mean of the five most recent E.coli samples taken during the same bathing season shall not exceed 126 colonies per 100 ml and no single sample taken during the bathing season shall exceed 235 colonies per 100 ml

Enterococcus Enterococcus: the geometric mean of the five most recent samples taken during the same bathing season shall not exceed 33 colonies per 100 ml and no single sample taken during the bathing season shall exceed 61 colonies per 100 ml Fecal Coliform Fecal coliform: no single sample taken shall exceed 400 colonies per 100 ml Total Nitrogen2 ≥ 0.45 mg/L Total Phosphorus ≥0.100 mg/L for a single sample or monthly average of 0.05 mg/L Dissolved Oxygen4 ≥5.0 mg/L Notes: 1: Concentrations of chlorine above the applicable Threshold Value can be indicative of sewage/sewer input 2: Threshold Value based on the Taunton River Watershed Authority (TRWA) water quality assessment after consultation with MassDEP, Rhode Island Department of Environmental Management (RIDEM), and EPA. 3: Threshold Value based on EPA Suggested Water Criteria for Water and the TWRA continuous observations and assessment data collected from watershed. 4: Preliminary guideline as stated in correspondence letter from MassDEP to the City of Taunton regarding MassDEPs update to the water quality criteria Dissolved Oxygen (DO) criteria.

3 Massachusetts Water Quality Standards: http://www.mass.gov/eea/docs/dep/service/regulations/314cmr04.pdf Screening/Sampling Standard Operating Procedures and Forms

2.4 Follow-up Ranking of Outfalls and Interconnections

The City of Taunton DPW will update and re-prioritize the initial outfall and interconnection rankings based on information gathered during dry and wet weather screening. The rankings will be updated periodically as dry weather screening information becomes available, but will be completed within three (3) years of the effective date of the permit (July 1, 2020).

Outfalls/interconnections where relevant information was found indicating sewer input to the MS4 or sampling results indicating sewer input are highly likely to contain illicit discharges from sanitary sources. Such outfalls/interconnections will be ranked at the top of the High Priority Outfalls category for investigation. Other outfalls and interconnections may be re-ranked based on any new information from the dry weather screening. IDDE Outfall Inspection and Screening Form – Dry and Wet Weather Screening/Sampling

INSPECTION/OUTFALL ID: INSPECTOR(S): INSPECTION DATE: LOCATION: Location Mapped or Inventoried YES NO Address or Nearest St. Intersection:

Receiving Water: Land Use in Drainage Area (select all that apply): Industrial Commercial Residential Open Space Other: Known Industries:

OUTFALL DESCRIPTION SHAPE: Circular Round Box Elliptical Other: SHAPE SIZE: Single Double Triple Other: Dimensions: Number of Grates (if applicable): Damage: Damage Details:

FLOW CHARACTERISTICS: Flow Present: YES NO Flow Description: Trickle Moderate Substantial Turbulent IDDE Outfall Inspection and Screening Form – Dry and Wet Weather Screening/Sampling

PHYSICAL INDICATORS Odor YES NO Odor Description: Sewage Sulfide Petroleum/Gas Rancid/Sour Other: Additional Description: Color Description: Turbidity: Floatables: Floatables Description Deposits/Stains: Stains Details: Abnormal Vegetation: Benthic Growth:

SAMPLE CATEGORY: DRY WEATHER WET WEATHER WEATHER Previous 24 hour rainfall (Inches): Previous 48 hour rainfall (inches): Air Temperature: Water Chemistry pH: DO (mg/L): Ammonia (mg/L)- Test Kit Surfactants (mg/L)- Test Kit Additional Analysis: E.Coli Fecal Coliform Total Nitrogen Total Phosphorus Other:

Additional Comments/Observations: APPENDIX E – Employee Training Record CITY OF TAUNTON, MASSACHUSETTS ILLICIT DISCHARGE DETECTION AND ELIMININATION TRAINING LOG Employee Training Record

Training Date: ______

Length of Training: ______

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