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Stormwater Regulations. NC Division Of Water Quality DPPEA Technical Sharing Session May 25, 2004. Why Be Concerned About Stormwater. Increased Imperviousness Increased Runoff Increased Pollutants Impacts to Streambanks Erosion/Sedimentation. Why be Concerned about Stormwater?.
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Stormwater Regulations NC Division Of Water Quality DPPEA Technical Sharing Session May 25, 2004
Why Be Concerned About Stormwater • Increased Imperviousness • Increased Runoff • Increased Pollutants • Impacts to Streambanks • Erosion/Sedimentation
Why be Concerned about Stormwater? Declining water quality Increasing demand for clean water Urbanization: Population doubling every 50 years 88% increase in urban area from 1982-1997 (USDA-NRCS)
State Stormwater Programs • State Stormwater Management Program • Water Supply Watershed Protection Program • 401 Water Quality Certification Program • Nutrient Sensitive Waters Programs
General Management StrategyState Stormwater • New Development / Redevelopment • Minimize Impervious Cover-12% to 30% BUA • Use Passive Stormwater Management • Engineered Controls Where Necessary, to remove 85% TSS • Approvals From State or Local Gov.
NPDES Stormwater • Phase I • Industrial Activities • Construction Sites 5 acres • Large and Medium MS4s • Phase II • Small MS4s • Construction Sites 1 acre • Industrial No-Exposure Certification
NPDES Industrial Coverage • Manufacturing/Process Type Activities • Private and Public Entities • Comprehensive Stormwater Pollution Prevention Plans • Regular Review and Assessment
Construction NPDES Coverage • Required In Addition to E&SC Plan • Point Source Discharges of Stormwater • Projects Greater Than One Acre
Permit ConditionsLimitations & Controls • Submit and Receive Approved E & S Plan • Comply With Approved E & S Plan • Materials Handling - fuel, oil, waste, etc. • Chemical Application - fertilizers, etc. • Operation and Maintenance
Municipal NPDES Coverage • Automatically Designated - Urbanized Areas • State Designated Public Entities • Petitioned Entities That Are State Designated
2000 USA Census Urbanized Areas • Automatic designation by USEPA of municipal separate storm sewer systems (MS4s)
North Carolina NPDES Stormwater ProgramAutomatic Coverage North Carolina - NPDES Stormwater Program
North Carolina NPDES Stormwater ProgramAutomatic & Possible State Designation North Carolina - NPDES Stormwater Program
Minimum Control Elements • Public Education and Outreach • Public Involvement/Participation • Illicit Discharge Detection & Elimination • Construction Site Runoff Control • Post-construction Stormwater Management • Pollution Prevention/Good Housekeeping
Post Construction Runoff Control New development and redevelopment 1-year / 24-hour storm control 85% average annual TSS removal Operation & maintenance of BMPs Specific requirements for Class SA, Tr, NSW
Penalties for Noncompliance • Penalty not to exceed $25,000 per day per violation.
Information Sources Division of Water Quality Stormwater and General Permits Unit http://h2o.enr.state.nc.us/su/stormwater.html Environmental Protection Agency http://cfpub.epa.gov/npdes/
Grouted rip rap replaced with “wet meadow” and sediment forebay