City of Raleigh Stormwater Management Plan Permit No. NCS000245 - Updated February 2021 - Final - Prepared by: Brown and Caldwell 1 City of Raleigh NC - Permit No. NCS000245 Updated February 2021 Table of Contents Revision Log .................................................................................................................................................. 5 Certification................................................................................................................................................... 6 Section 1: Introduction ................................................................................................................................. 7 Section 2: MS4 Information .......................................................................................................................... 9 2.1 Permitted MS4 Area.............................................................................................................. 9 2.2 Existing MS4 Mapping ......................................................................................................... 10 2.3 Receiving Waters ................................................................................................................ 10 2.4 MS4 Interconnection .......................................................................................................... 14 2.5 Total Maximum Daily Loads ................................................................................................ 14 2.6 Industrial Facility Discharges............................................................................................... 14 2.7 Non-Stormwater Discharges ............................................................................................... 14 2.8 Target Pollutants and Sources ............................................................................................ 16 Section 3: Program Implementation ........................................................................................................... 17 3.1 City Ordinances ................................................................................................................... 17 3.2 Program Funding and Budget ............................................................................................. 17 3.3 Organizational Structure ..................................................................................................... 17 Section 4: Public Education and Outreach .................................................................................................. 21 Section 5: Public Involvement and Participation ........................................................................................ 24 Section 6: Illicit Discharge Detection and Elimination (IDDE) ..................................................................... 26 Section 7: Construction Site Runoff Controls ............................................................................................. 29 Section 8: Post-Construction Site Runoff Controls ..................................................................................... 31 Section 9: Pollution Prevention and Good Housekeeping for Municipal Operations ................................ 34 Section 10: Program to Monitor and Control Pollutants in Storm Water Discharges to Municipal Systems .................................................................................................................................................................... 39 Section 11: Water Quality Assessment and Monitoring ............................................................................. 41 Section 12: Total Maximum Daily Loads ..................................................................................................... 43 Section 13: Program Assessment, Record Keeping, and Reporting ............................................................ 48 13.1 Program Assessment ........................................................................................................ 48 13.2 Record Keeping ................................................................................................................. 48 13.3 Annual Reporting .............................................................................................................. 48 List of Figures Figure 1. City of Raleigh Corporate Limits and ETJ ....................................................................................... 9 Figure 2. City of Raleigh MS4 Permit Implementation Responsible Departments Organizational Chart ... 18 Figure 3. City of Raleigh Stormwater Management Division MS4 Permit Implementation Organizational Chart ............................................................................................................................................................ 19 List of Tables Table 1. MS4 Receiving Waters ................................................................................................................... 10 Table 2. Summary of EPA-Approved TMDLs or Nutrient Management Strategies .................................... 14 Table 3. Non-Stormwater discharges.......................................................................................................... 15 Table 4. Program Element – Program Implementation .............................................................................. 20 2 City of Raleigh NC - Permit No. NCS000245 Updated February 2021 Table 5. BMP Measurable Goals for the Public Education and Outreach Program .................................... 22 Table 6. BMP Measurable Goals for the Public Involvement and Participation Program .......................... 25 Table 7. BMP Measurable Goals for the IDDE Program ............................................................................. 27 Table 8. Program Elements for Construction Site Runoff Controls ............................................................ 30 Table 9. BMP Measurable Goals for Post Construction Site Runoff Control .............................................. 32 Table 10. BMP Measurable Goals for Pollution Prevention and Good Housekeeping for Municipal Operations .................................................................................................................................................. 36 Table 11. BMP Measurable Goals for the Program to Monitor and Control Pollutants in Stormwater Discharges to Municipal Systems ................................................................................................................ 40 Table 12. BMP Measurable Goals for Water Quality Assessment and Monitoring .................................... 42 Table 13. BMP Measurable Goals for TMDL Program ................................................................................ 44 Table 14. Program Elements for TMDL Program ........................................................................................ 47 3 City of Raleigh NC - Permit No. NCS000245 Updated February 2021 Acronyms AU Assessment Unit BMP Best Management Practice City City of Raleigh CWEP Clean Water Education Partnership DEQ North Carolina Department of Environmental Quality ETJ Extra Territorial Jurisdiction GIS Geographic Information System I&M Inspection and Maintenance IDDE Illicit Discharge Detection and Elimination MEP Maximum Extent Practicable MS4 Municipal Separate Storm Sewer System NCDOT North Carolina Department of Transportation NCSU North Carolina State University NPDES National Pollutant Discharge Elimination System PPGH Pollution Prevention and Good Housekeeping SARA Superfund Amendments and Reauthorization Act of 1986 SCM Stormwater Control Measure SMAC Stormwater Management Advisory Commission SPCA North Carolina Sedimentation Pollution Control Act SPPP Site Pollution Prevention Plan SOP Standard Operating Procedure SWMP Stormwater Management Plan SWPPP Stormwater Pollution Prevention Plan TMDL Total Maximum Daily Load UDO Unified Development Ordinance WLA Waste Load Allocation 4 City of Raleigh NC - Permit No. NCS000245 Updated February 2021 Revision Log Revision Date Revision Staff Number 5 City of Raleigh NC - Permit No. NCS000245 Updated February 2021 Section 1: Introduction The City of Raleigh (City) operates under a Phase I National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) Permit Number NCS000245. The current iteration of the City permit became effective October 10, 2018 and extends through October 9, 2023. This permit authorizes the City to discharge stormwater from the MS4, located within the City corporate limits, into the receiving waters of the State within the Neuse River Basin. This document is the Stormwater Management Plan (SWMP), as required by Part I.A of the City’s NPDES MS4 permit, which establishes the methods by which the City implements the permit requirements to achieve compliance and protect receiving stream water quality, to the extent allowable under State and local law. In preparing this SWMP, the City of Raleigh has evaluated its MS4 and the permit requirements to develop a comprehensive five-year SWMP that will meet the community’s needs, address local water quality issues, and provide the measures necessary to comply with the permit. This includes the effective prohibition of non-stormwater discharges to the MS4 and the reduction of pollutant discharges to the maximum extent practicable (MEP) through the implementation of the six minimum measures stipulated in the Federal NPDES regulations. This SWMP identifies the