Town of Wake Forest

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Town of Wake Forest
NPDES General Stormwater Permit

• Scott Miles, PE
• Assistant Town Engineer

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NPDES Stormwater

• NPDES stands for National Pollutant Discharge
  Elimination System
• Used to control point source pollution
• Effective since March 2003
• Required on construction sites greater than or
  equal to 1 acre (WF all erosion permit sites)
• Forestry and Agricultural are exempt
• Issued with ESC permit at precon
• Enforced by DWQ

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Permit Elements

• Erosion and Sediment Control Plan
• Monitoring
• Operation and Maintenance

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Erosion and Sediment Control Plan

• Must be operating off an approved set of plans
• Permit must be on site at all times

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Who inspects?

• Town of Wake Forest staff will make periodic
  inspections
• DWQ staff might
• DLR staff might

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Onsite Needs

• Copy of the approved ES plan
• Rain Gauge
• Records of rainfall amounts and dates
• Records of inspections (BMPs and stream
  conditions)

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Monitoring

• Must inspect at least once a week
• Must inspect all facilities after any storm
  greater than a half inch (within 24 hrs)
• Must observe runoff from site to check for silt,
  solids, etc.

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Operation and Maintenance

• Regular OM is crucial to success
• Corrective action must take place immediately
• Clean out sediment basin when it reaches 50
  capacity with silt
• Stabilize eroded banks
• Repair/Clean inlets and outlets
• Repair damaged silt fence

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Additional Items

• Significant amounts of sediment in the stream
  must be reported
• Contamination from construction equipment must be
  contained. Prompt clean up oil spills, hydraulic
  fluids, etc.
• Take this permit seriously. Civil penalties can
  reach as much as 25,000 per day for each
  violation.

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Permanent BMPs

• Level Spreaders
• Scour holes
• Basins

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Future NPDES Phase II Program

• The stormwater management program must include
  these six minimum control measures
• 1.  Public education and outreach on
  stormwater impacts
• 2.  Public involvement/participation
• 3.  Illicit discharge detection and elimination
• 4.  Construction site stormwater runoff control
• 5.  Post-construction stormwater management in
  new development and redevelopment
• 6.  Pollution prevention/good housekeeping for
  municipal operations

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NPDES phase II cont

• N P
• Wet Pond 25 40
• Stormwater Wetland 40 35
• Sand Filter 35 45
• Bioretention 35 45
• Grass Swale 20 20
• Vegetated Filter Strip
• with Level Spreader 20 35
• 50-ft Restored Riparian Buffer
• with Level Spreader 30 30
• Dry Detention 10 10

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Contacts

• Scott Miles, PE 554-6188
• Holly Spring, EI 554-3158
• Eric Keravuori, PE 554-6122
• Questions?