General Permit for the Discharge of Stormwater from Small Municipal Separate Storm Sewer Systems (MS4) Stormwater Management Plan 2015 Annual Report Town of Enfield Enfield, Connecticut May 2016 146 Hartford Road Manchester, Connecticut 06040 Table of Contents Stormwater Management Plan 2015 Annual Report Town of Enfield 1 Introduction .................................................................................................. 1 2 Public Education and Outreach on Stormwater Impacts ........................ 2 2.1 Staff and Property Owner Education .................................................................... 2 2.2 Storm Drain Stenciling .......................................................................................... 4 2.3 Watercourse Signs ................................................................................................. 4 2.4 Plan Modifications ................................................................................................ 4 2.5 Future Activities .................................................................................................... 4 3 Public Involvement and Participation........................................................ 4 3.1 Community (Riverbank) Clean-Ups ..................................................................... 5 3.2 Recreational Water Resource Events .................................................................... 5 3.3 Plan Modifications ................................................................................................ 6 3.4 Future Activities .................................................................................................... 6 4 Illicit Discharge Detection and Elimination ............................................... 6 4.1 Identification of Illicit Discharge Sources ............................................................ 7 4.1.1 Mapping of Outfalls ..................................................................................................... 7 4.2 Recycling Program ................................................................................................ 7 4.3 Plan Modifications ................................................................................................ 8 4.4 Future Activities .................................................................................................... 8 5 Construction Site Stormwater Runoff Controls ........................................... 8 5.1 Ordinance/Regulatory Mechanisms .................................................................... 8 5.2 Inspection Program ..............................................................................................10 5.3 Plan Modifications ...............................................................................................10 5.4 Future Activities ...................................................................................................10 6 Post Construction Stormwater Management .......................................... 11 6.1 Post Construction Stormwater BMPs .................................................................. 11 6.2 Plan Modifications ...............................................................................................12 6.3 Future Activities ...................................................................................................12 7 Pollution Prevention and Good Housekeeping ...................................... 12 7.1 Information Management System ........................................................................ 12 7.2 Maintenance Schedule .........................................................................................13 7.3 Plan Modifications ...............................................................................................13 7.4 Future Activities ...................................................................................................14 F:\P1989\89272\T58\2015 Annual MS4 Report\2015 - SWMP - Annual MS4 Report.Docx i Table of Contents Stormwater Management Plan 2015 Annual Report Town of Enfield 8 Outfall Monitoring ...................................................................................... 14 8.1 Sampling of Representative Outfalls .................................................................... 14 8.2 Other Water Quality Data Collection ................................................................... 15 Appendices End of Report Appendix A MS4 General Permit Registration Appendix B Public Education and Outreach on Stormwater Impacts Appendix C Public Involvement and Participation Appendix D Illicit Discharge Detection and Elimination Appendix E Construction Site Stormwater Runoff Controls Appendix F Post-Construction Stormwater Management Appendix G Pollution Prevention and Good Housekeeping for Municipal Operations Appendix H Outfall Monitoring F:\P1989\89272\T58\2015 Annual MS4 Report\2015 - SWMP - Annual MS4 Report.Docx ii 1 Introduction The U.S. Environmental Protection Agency (USEPA) promulgated Phase II of its National Pollution Discharge Elimination System (NPDES) stormwater regulations on December 8, 1999. Phase I of the USEPA stormwater program established regulations for stormwater discharges from municipal separate storm sewer systems (MS4s) in municipalities with populations of 100,000 or greater, construction activities disturbing five or more acres of land, and ten categories of industrial facilities. The Phase II Final Rule expands the Phase I program by requiring smaller communities with MS4s in urbanized areas to implement programs and practices to control polluted stormwater runoff through the use of NPDES permits. The Town of Enfield is one of approximately 130 municipalities in Connecticut that are located either completely or partially within an urbanized area. These communities were mandated to seek permit coverage with the Connecticut Department of Energy and Environmental Protection’s (CT DEEP) Phase II Stormwater Program. CT DEEP issued the final General Permit for the Discharge of Stormwater from Small Municipal Separate Storm Sewer Systems (MS4 General Permit) on January 9, 2004. The permit was reissued without changes on January 9, 2009 and again on January 12, 2016 and is set to expire on June 30, 2017 (Appendix A). No re-registration is required. CT DEEP indicates permittees must continue implementing their Stormwater Management Plan, conduct annual sampling and submit their annual reports. A new modified MS4 General Permit was issued and will become effective July 1, 2017. Compliance with the 2004 MS4 permit was a two-part process. The first part (Part A – General Permit Registration) was the submission of a registration form including primarily administrative information and basic mapping. The CT DEEP issued the Town of Enfield a General Permit for Stormwater – Small Municipal Separate Storm Sewer Systems (General Permit) (#GSM000086) on April 26, 2004. A copy of the General Permit registration certificate is included as Appendix A. The second part of the process is the submission of a Stormwater Management Plan (SWMP). The Town of Enfield submitted the initial SWMP to the CT DEEP, ‘Town of Enfield - MS4 General Permit Annual Report for CY 2005,’ on April 18, 2006. The 2006 SWMP Report described the program elements and their status regarding compliance with the six Minimum Control Measures outlined in the MS4 General Permit. The six Minimum Control Measures include: • Public Education and Outreach on Stormwater Impacts • Public Involvement/Participation • Illicit Discharge Detection and Elimination • Construction Site Stormwater Runoff Controls • Post-Construction Stormwater Management in New Development and Redevelopment • Pollution Prevention/Good Housekeeping for Municipal Operations This Annual Report for the 2015 calendar year, outlines the status of compliance with the MS4 General Permit, provides an assessment of the appropriateness of the previously identified best management practices and the Town’s progress towards achieving the implementation dates and measurable goals of each Minimum Control Measure as identified in the 2006 Initial SWMP Report. In addition, the Annual F:\P1989\89272\T58\2015 Annual MS4 Report\2015 - SWMP - Annual MS4 Report.Docx 1 Report provides results of monitoring data collected and analyzed during the reporting period, summarizes stormwater activities the Town plans to undertake during the next reporting cycle, and outlines any changes to previously identified measurable goals or implementation dates that apply to the program elements. The Town of Enfield will continue to implement the SWMP program elements according to the requirements of the MS4 General Permit until it expires and replaced by the new, modified MS4 General Permit. Implementation of the six Minimum Control Measures to take steps in keeping the stormwater entering its storm sewer system clean before that stormwater enters water bodies is described in the following sections. 2 Public Education and Outreach on Stormwater Impacts An informed and knowledgeable community is crucial to the success of a stormwater management program as it provides support for the program through volunteers and donors with an understanding of why the program is important and necessary. In addition, there will be greater compliance with the program as the public becomes more aware of their own personal responsibilities and those expected of the community to protect and improve area waters. 2.1 Staff and Property Owner Education The Town of Enfield continues