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Draft Chesapeake Bay TMDL Action Plan Public Meeting

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Draft Chesapeake Bay TMDL Action Plan Public Meeting

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Draft Chesapeake Bay TMDL Action Plan Public Meeting

  1. 1. A Fairfax County, VA, publication Department of Public Works and Environmental Services Working for You! Draft Chesapeake Bay TMDL Action Plan Public Meeting December 14 and 15, 2016 1
  2. 2. Draft Chesapeake Bay TMDL Action Plan Key Definitions and Acronyms • MS4 – Municipal Separate Storm Sewer System – Area draining to stormwater outfalls owned or operated by the County that discharge to surface waters – Subject to an MS4 permit under state and federal law – Issued for five-year terms, although may be administratively extended; the most recent permit was issued April 1, 2015 • Impaired Waterbody – A waterbody that does not meet water quality standards based on monitoring data – Listed in accordance with Section 303(d) of the federal Clean Water Act • TMDL – Total Maximum Daily Load – The maximum amount of a pollutant that a waterbody can receive and still meet water quality standards – A TMDL generally establishes the existing load and the target load. It then allocates the load reduction among sources – The allocation is divided into a load allocation (LA) and a wasteload allocation (WLA) • TMDL Action Plan – The MS4 permit requires the County to develop plans for how it intends to achieve the required pollutant load reductions 2
  3. 3. Draft Chesapeake Bay TMDL Action Plan Example MS4 Components 3 1 Downspout 2 Untreated runoff 5 Stormwater outfall 6 Urban stream 3 Storm drain 4 Sewer system
  4. 4. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Bay TMDL Background – A Long, Winding Road • Voluntary interstate effort formalized by 1983 Chesapeake Bay Agreement • Shift from voluntary to regulatory – lawsuit and 2010 Chesapeake Bay TMDL • Pollutants of Concern (POCs): nitrogen, phosphorus, and sediment • Means and methods in place to clean up the Bay by 2025 4
  5. 5. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Impacts of Nutrients and Sediment on the Bay 5
  6. 6. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Algae Bloom Caused by Excess Nutrients 6
  7. 7. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Sediment from Hurricane Isabel 7
  8. 8. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Chesapeake Bay TMDL “The TMDL – the largest ever developed by EPA – identifies the necessary pollution reductions of nitrogen, phosphorus and sediment across Delaware, Maryland, New York, Pennsylvania, Virginia, West Virginia and the District of Columbia and sets pollution limits necessary to meet applicable water quality standards in the Bay and its tidal rivers and embayments.” 8
  9. 9. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Virginia’s Plan for the Chesapeake Bay • Virginia Watershed Implementation Plan (WIP) Phase I and II • Allocates POC reduction targets based on the Bay Model: – Wastewater – Agriculture – Urban/suburban stormwater – Onsite wastewater (septic systems) – Forest lands – Resource extraction – Federal facilities • Virginia’s challenge – it can only require reductions for entities subject to permits or regulations. 9
  10. 10. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Fairfax County’s Two-Pronged Approach • Meet the MS4 permit requirements: – Delineate MS4 service area as of 2009 (base year for reductions) – Delineate impervious and pervious surfaces within the service area – Use information to calculate required POC reductions • WIP milestones: 5% of reduction targets by 2020; 40% by 2025 and 100% by 2030 10
  11. 11. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Fairfax County’s MS4 11
  12. 12. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Bottom Line – Required POC Reductions 12 Nitrogen lbs/year Phosphorus lbs/year Sediment lbs/year 5% by 2020 2,959.42 323.42 263,865.57 40% by 2025 23,675.36 2,587.36 2,110,924.56 100% by 2030 59,188.4 6,468.4 5,277,311.4
  13. 13. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Before there were specific Bay TMDL requirements… • Fairfax County developed watershed management plans for each of the County’s 30 watersheds • Plans identify and address issues affecting water quality • Include policies and projects • Many of projects in the plans have been leveraged to meet the Chesapeake Bay TMDL • Plans can be found at www.fairfaxcounty.gov/dpwes/ watersheds/ 13
  14. 14. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Key Components of the Action Plan • Detailed guidance provided by the Virginia Department of Environmental Quality (DEQ Guidance Memo 15-2005) • New development: – No net increase in phosphorus load: Fairfax County Stormwater Management Ordinance (July 1, 2014) – Address increases from 2009 to 2014 – Make up for increases from grandfathered projects • Means and methods to reduce POCs from existing development 14
  15. 15. Draft Chesapeake Bay TMDL Action Plan Stormwater Management 2009-2014 Development – A funny thing happened… • MS4 permit requirement – offset increase over 16% impervious cover (0.45 lbs/phosphorus/acre/year) • County requirements during this time period: – 40% phosphorus removal for new development County-wide – 50% for new development in the Water Supply Protection Overlay District – 10% for redevelopment County-wide – Exemptions for large lot subdivisions and infill development • What does that all mean? 15 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Increase from New Impervious Cover 1,202.69 174.30 81,782.93 Reduction from Stormwater Facilities 1,610.69 404.12 196,603.22 Net Reduction (Credit) 408.00 229.82 114,820.29 Percent Total (Year 2030) Target 0.7% 3.5% 2.2%
  16. 16. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Means and Methods – Key Considerations • The County has been preparing for a while! – Stormwater retrofits since 2009 – Stream restorations since 2010 • Credit for past actions not captured in the Bay Model – 2006 to 2009 stormwater facilities • Credit for going above regulatory minimums – Nutrient management plans – Single family residential development under one acre • Project selection process: – Watershed management plans and other inputs – Technical feasibility – Community support – Ability to address local impairments – Cost-benefit ratio • MOU with Herndon and Vienna 16
  17. 17. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Historic BMPs – 2006 to 2009 17 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Net Reduction (Credit) 5,705.48 670.27 577,628.02 Percent Total (Year 2030) Target 9.6% 10.3% 10.9%
  18. 18. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Stormwater Retrofit Projects 18 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Net Reduction (Credit) 6,229.76 602.23 722,129.86 Percent Total (Year 2030) Target 10.5% 9.3% 13.7%
  19. 19. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Stream Restoration 19 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Net Reduction (Credit) 17,446.58 5,438.31 1,832,406.33 Percent Total (Year 2030) Target 29.4% 84.0% 34.7%
  20. 20. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Land Use Change 20 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Net Reduction (Credit) 37.27 0.54 207.31 Percent Total (Year 2030) Target 0.1% <0.1% <0.1%
  21. 21. Stormwater Management Draft Chesapeake Bay TMDL Action Plan In-Lake Forebay Projects 21 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Net Reduction (Credit) 5,423.87 341.31 149,689.15 Percent Total (Year 2030) Target 9.2% 5.3% 2.8%
  22. 22. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Redevelopment 22 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Net Reduction (Credit) Coming Soon Coming Soon Coming Soon Percent Total (Year 2030) Target NA NA NA
  23. 23. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Single Family Residential Under One Acre 23 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Net Reduction (Credit) 135.32 22.09 11,977.54 Percent Total (Year 2030) Target 0.2% 0.3% 0.2%
  24. 24. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Septic Conversion 24 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Net Reduction (Credit) 1,806.85 -- -- Percent Total (Year 2030) Target 3.0% 0.0% 0.0%
  25. 25. Stormwater Management Draft Chesapeake Bay TMDL Action Plan Nutrient Management Plans 25 Pollutant TN (lbs/year) TP (lbs/year) TSS (lbs/year) Net Reduction (Credit) 89.58 1.82 -- Percent Total (Year 2030) Target 0.2% <0.1% 0.0%
  26. 26. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Other Means and Methods • Additional means and methods that the County may take credit for in the future: – Parking lot sweeping – Off-site nutrient credits (purchased or transferred from wastewater treatment facilities) – Home owner practices such as downspout disconnection, tree planting, rainwater harvesting, nutrient management plans, etc. 26
  27. 27. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Current Permit Compliance Snapshot 27 Total Nitrogen (lbs/year) Total Phosphorus (lbs/year) Total Suspended Solids (lbs/year) Required Reductions from Existing Sources 2,959.42 323.42 263,865.57 + Required New Source Offsets -408.00 -229.82 -114,820.29 + Required Grandfathered Offsets 56.27 8.11 3,727.09 = Total Required Reductions and Offsets for Current Permit Cycle 2,607.69 101.71 152,772.37 - Means and Methods from Section 5 36,874.71 7,076.57 3,294,038.21 = Reductions Remaining for Current Permit Cycle -34,267.02 -6,974.86 -3,141,265.84 Credit Applied to Next Permit Cycle 34,267.02 6,974.86 3,141,265.84
  28. 28. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Total Compliance – Year 2030 Target 28 0.0% 20.0% 40.0% 60.0% 80.0% 100.0% 120.0% TN TP TSS Structural Retrofits Stream Restoration 2006-2009 Redevelopment SFR 2009-2014 SFR Post 2014 PL 566 Dams Septic Conversion Off-Site Credits NMPs Land Use Change Other New Source Credits 63.0% 112.8% 64.6% 203020252020 Cost To-Date = ~$79 Million
  29. 29. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Uncertainties, Challenges, and Next Steps • Remaining POC Reductions – Still must achieve additional ~40% reduction in nitrogen and sediment – Several projects in-design or being scoped – Fewer easily accessible stream restoration projects • 2017 Mid-Term Assessment and WIP Phase III – Changes in POC reduction targets? – Changes in target dates? • Local TMDL Action Plans for Sediment – Higher local reduction targets – Bull Run, Difficult Run, and Popes Head Creek • Project Maintenance – Credits will expire if projects are not maintained 29
  30. 30. Draft Chesapeake Bay TMDL Action Plan Stormwater Management Next Steps • Public comment period will run through January 23, 2017 • Draft plan and responses to comments will be presented to the Board of Supervisors’ Environmental Committee on February 7, 2017 • Plan must be submitted to the Virginia Department of Environmental Quality by March 31, 2017 • Draft plan is available at: http://www.fairfaxcounty.gov/dpwes/stormwater/chesapeake-bay-tmdl.pdf 30
  31. 31. Additional Information and Comments For additional information or to submit comments www.fairfaxcounty.gov/dpwes Draft Chesapeake Bay TMDL Action Plan Stormwater Management 31 Kate Bennett, MS4 Program Coordinator (703) 324-5500 Mailing address: MS4 Program Coordination Section Stormwater Planning Division, Fairfax County DPWES 12000 Government Center Parkway, Suite 449, Fairfax, VA 22035-0052 E-mail address: DPWESMS4mail@fairfaxcounty.gov

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