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stormwater management: fairfax county s ms4 program

What is an MS4?. MS4 = Municipal Separate Storm Sewer SystemConveyance or system of conveyancesOwned by a public entityCollects and conveys stormwaterDischarges to waters of the U.S.Not a combined sewerNot part of a Publicly Owned Treatment Works (POTW). Fairfax County's MS4. 42,000 Storm Drainage Inlets and Catch Basins3,000 Private Stormwater Management Facilities1,300 Public Stormwater Management Facilities.

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stormwater management: fairfax county s ms4 program

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    1. Stormwater Management:Fairfax Countys MS4 Program SWANA Surface Water and Groundwater Training June 24, 2009

    3. Fairfax Countys MS4 42,000 Storm Drainage Inlets and Catch Basins 3,000 Private Stormwater Management Facilities 1,300 Public Stormwater Management Facilities

    4. MS4 Program Timeline 1972: Clean Water Act established the National Pollutant Discharge Elimination System (NPDES) 1975: NPDES delegated to Virginia Virginia Pollutant Discharge Elimination System (VPDES) 1987: MS4s added to NPDES 1990: Phase I NPDES developed Large and medium MS4s (more than 100,000 residents) Industrial activities (11 categories regulated) 1999: Phase II NPDES program for small MS4s 2005: MS4 program transferred from DEQ (VPDES) to DCR Virginia Stormwater Management Program (VSMP)

    5. Fairfax County MS4 Permit History 1991: Application Part I submitted to DEQ 1992: Application Part II submitted to DEQ 1997: First 5-year VPDES permit issued 2001: Renewal application submitted to DEQ 2002: Second 5-year VPDES MS4 permit issued 2006: Renewal application submitted to DCR January 2007: Second permit expired but administratively continued by DCR January 2007, 2008, 2009: Pre-draft permits received from DCR

    6. MS4 Permit Overview Permit issued to Fairfax County Compliance coordinated by Stormwater Management Authorizes specific discharges from MS4 to waters of the U.S. Requires development and implementation of a Stormwater Management Program (SWMP) to: Reduce the contamination of stormwater runoff Prohibit illicit discharges

    7. Current SWMP Components Watershed Management Program Structural and Source Controls Areas of New Development and Significant Redevelopment Roadways Retrofitting Pesticide, Herbicide, and Fertilizer Application Illicit Discharges and Improper Disposal Spill Prevention and Response Industrial and High Risk Runoff Construction Site Runoff Storm Sewer Infrastructure Management Public Education Monitoring Programs

    8. Current SWMP Components (Continued) Legal Authority Control contribution of pollutants to MS4 Prohibit illicit discharges to MS4 Control spills and dumping to MS4 Require compliance with permit conditions Carry out inspections, surveillance and monitoring to determine compliance with permit conditions Stormwater Management Program Resources Shall provide adequate resources to implement SWMP to Maximum Extent Practicable (MEP) Stormwater Management Program Review and Updates Update SWMP annually Monitoring and Reporting Requirements

    10. MS4 Program Challenges (Continued) Physically Interconnected Systems Local MS4 Permits Arlington and Loudoun Counties Cities of Alexandria, Fairfax and Falls Church Towns of Herndon and Vienna Fairfax County Public Schools State MS4 Permits George Mason University Northern Virginia Community College VDOT Northern Urban Area Federal MS4 Permits U.S. Central Intelligence Agency U.S. Army Fort Belvoir

    12. 2009 Pre-Draft PermitSummary of Significant Changes Permittee responsibilities extended beyond MEP and protect water quality by satisfying the appropriate water quality requirements of the CWA Discharge conditions vs. discharge goals Industrial and high risk runoff program expanded to include all municipal facilities Incorporation of impaired waters and TMDLs Review and update all ordinances and other legal authority Clear definition of roles and responsibilities

    13. Impaired Waters and TMDLs Federal and State law require: Monitoring of water quality Assessment of monitoring data Identification of impaired waters (do not meet WQS) Development of Total Maximum Daily Load (TMDL) for impaired waters Identify pollutant sources Quantify reductions needed to meet WQS State law also requires development of a TMDL Implementation Plan (IP)

    19. Fairfax County Stream Conditions

    20. Questions?

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