Illicit Discharge Detection and Elimination Plan DRAFT Wayland, Massachusetts EPA NPDES Permit Number: BRPWM08A PREPARED BY: Copyright 2019 Kleinfelder Town of Wayland, MA – Illicit Discharge Detection & Elimination Plan TABLE OF CONTENTS ____________________________________________________________________________ Section Page 1 INTRODUCTION ............................................................................................................. 1 1.1 MS4 Program ....................................................................................................... 1 1.2 Illicit Discharges ................................................................................................... 1 1.3 Allowable Non-Stormwater Discharges ................................................................ 2 1.4 Receiving Waters and Impairments ..................................................................... 3 1.5 IDDE Program Goals, Framework, and timeline ................................................... 4 1.6 Work Completed To Date ..................................................................................... 5 2 IDDE RESPONSIBILITIES .............................................................................................. 6 2.1 Legal Authority ..................................................................................................... 6 2.2 Responsible Teams ............................................................................................. 6 2.3 Proposed Coordination Efforts ............................................................................. 6 3 TOWN OF WAYLAND STORMWATER MAPPING ........................................................ 7 3.1 Mapping Updates ................................................................................................. 7 3.2 IDDE Mapping Requirements: Phase 1 ................................................................ 7 3.3 IDDE Mapping Requirements: Phase 2 ................................................................ 7 3.4 2019 Outfall Inventory .......................................................................................... 8 4 SANITARY SEWER OVERFLOWS (SSOS) .................................................................... 9 5 ASSESSMENT AND RANKING OF OUTFALLS AND INTERCONNECTIONS ............ 11 5.1 Outfall Catchment Delineations .......................................................................... 11 5.2 Classify and Rank Outfalls ................................................................................. 11 5.2.1 Problem Outfalls ..................................................................................... 12 5.2.2 High Priority Outfalls ............................................................................... 13 5.2.3 Low Priority Outfalls ............................................................................... 13 5.2.4 Excluded Outfalls ................................................................................... 14 5.3 Preliminary Outfall Ranking ................................................................................ 14 6 DRY WEATHER SCREENING AND SAMPLING.......................................................... 15 6.1 Weather Conditions ........................................................................................... 15 6.2 Dry Weather Screening/Sampling Procedure ..................................................... 15 6.2.1 General Procedure ................................................................................. 15 6.2.2 Field Equipment ..................................................................................... 17 6.2.3 Sample Collection and Analysis ............................................................. 18 6.3 Interpreting Outfall Sampling Results ................................................................. 22 6.4 Follow-Up Ranking of Outfalls and Interconnections .......................................... 22 7 CATCHMENT INVESTIGATIONS ................................................................................. 23 7.1 System Vulnerability Factors .............................................................................. 23 7.2 Dry Weather Manhole Inspections ..................................................................... 26 7.3 Wet Weather Outfall Sampling ........................................................................... 27 7.4 Source Isolation and Confirmation ..................................................................... 28 7.4.1 Sandbagging .......................................................................................... 28 Page | ii Town of Wayland, MA – Illicit Discharge Detection & Elimination Plan 7.4.2 Dye Testing ............................................................................................ 29 7.4.3 CCTV Inspections .................................................................................. 29 7.5 Illicit Discharge Removal .................................................................................... 29 7.5.1 Confirmatory Outfall Screening ............................................................... 30 7.6 Ongoing Screening ............................................................................................ 30 8 TRAINING ..................................................................................................................... 31 9 PROGRESS REPORTING ............................................................................................ 32 10 REFERENCES .............................................................................................................. 33 TABLES 1 Impaired Waters Wayland, Massachusetts 2 IDDE Program Implementation Timeline 3 Sanitary Sewer Overflow Inventory 4 Overview of Outfall Categorization 5 Outfall Observations and Possible Sources 6 Field Equipment – Dry Weather Outfall Screening and Sampling 7 Field Sampling Analyses 8 Sampling Parameters and Analysis Methods 9 Required Analytical Methods, Detection Limits, Hold Times, and Preservatives 10 IDDE Schedule for Completion of Catchment Investigations 11 Outfall Catchment System Vulnerability Factor (SVF) Inventory FIGURES 1 IDDE Investigation Procedure Framework 2 IDDE Plan Training for DPW Staff June 2019 APPENDICES A. Legal Authority B. Storm Sewer System Mapping C. NSP Outfall Inventory and Prioritization Tool D. Preliminary Outfall Ranking E. Inspection Field Forms and Sampling Procedures F. Analytical Testing Methods – Impaired Waters G. IDDE Employee Training Record Page | iii Town of Wayland, MA – Illicit Discharge Detection & Elimination Plan Definitions Best Management Practice (BMP): An activity, procedure, restraint, or structural improvement that helps to reduce the quantity or improve the quality of stormwater runoff. Catch basin: A chamber or well, usually built to the curb line of a street that allows surface water to discharge into a storm water drain. Clean Water Act: The Federal Water Pollution Control Act (33 U.S.C. § 1251 et seq.) as hereafter amended. Discharge of Pollutants: The addition of any pollutant or combination of pollutants into the municipal storm drain system or into the waters of the United States or Commonwealth from any source. Groundwater: Water beneath the surface of the ground. Illicit Connection: A surface or subsurface drain or conveyance, which allows an illicit discharge into the municipal storm drain system, including without limitation sewage, process wastewater, or wash water and any connections from indoor drains, sinks, or toilets, regardless of whether said connection was previously allowed, permitted, or approved before the effective date of bylaws enacted to prohibit such discharges. Illicit Discharge: Direct or indirect discharge to the municipal storm drain system that is not composed entirely of stormwater, except as exempted by the EPA’s Phase II regulations. Manhole – Sewer system structure typically made from brick, concrete block, or monolithic concrete sections. Manholes have solid covers that do not accept runoff like a catch basin. Manholes within a storm sewer system are installed typically at bends in pipe runs, every 300 feet to 400 feet within a storm sewer pipe run, intersections of two or more pipe runs, and at the ends of pipe runs. Manholes allow for the cleaning and inspection of storm sewer systems. Manholes are typically ‘fed’ stormwater by catch basins and upstream storm sewer pipes. Junction Manhole – Under the Permit, a junction manhole is a manhole or structure with two or more inlets accepting flow from two or more MS4 alignments. Manholes with inlets solely from private storm drains, individual catch basins, or both, are not considered junction manholes. Municipal Separate Storm Sewer System (MS4): The system of conveyances designed or used for collecting or conveying stormwater, including any road with a drainage system, street, gutter, curb, inlet, piped storm drain, pumping facility, retention or detention basin, natural or man-made or altered drainage channel, reservoir, and other drainage structure that together comprise the storm drainage system owned or operated by the Town of Wayland. National Pollutant Discharge Elimination System NPDES) Stormwater Discharge Permit: A permit issued by United States Environmental Protection Agency or jointly with the Commonwealth of Massachusetts that authorizes the discharge of pollutants to waters of the United States. Page | iv Town of Wayland, MA – Illicit Discharge Detection & Elimination Plan Non-Stormwater Discharge: