Storm Water Pollution Storm Water Pollution Prevention Plan DevelopmentPrevention Plan Development

Todd E. Hubmer PETodd E. Hubmer PEWSB & AssociatesWSB & Associates

hubmerhubmer@wsbeng@wsbeng.com.com

How to develop a SWPPPHow to develop a SWPPP

Description of the project Description of how storm water and

erosion will be manage on-site Includes narrative, erosion control plan

sheets, standard details Drainage map, soils map, ponding calcs

SWPPP ComponentsSWPPP Components

Ponding must treat 0.5” of runoff from new Ponding must treat 0.5” of runoff from new impervious surface for entire impervious surface for entire subwatershed subwatershed Wet basin,Wet basin, Regional pond,Regional pond, Combination, orCombination, or Alternative method (rain garden, etc.; requires Alternative method (rain garden, etc.; requires

90 day review by MPCA)90 day review by MPCA) Road projects: fit in ponding if you can. If Road projects: fit in ponding if you can. If

cannot fit in, other options (grassy swales, cannot fit in, other options (grassy swales, rock checks grit chambers, etc.) should be rock checks grit chambers, etc.) should be usedused

Inspections and MaintenanceInspections and Maintenance

NPDES requires inspection Every 7 days Within 24 hours of a 0.5 inch-24 hour rainfall

event Once a month for areas that have undergone

final stabilization (but work is ongoing in other areas)

See PCA calendar

Inspections and MaintenanceInspections and Maintenance

Inspection and maintenance must be recorded in writing and include: Date and time Name of inspector Findings and recommendations Corrective actions taken Date and amount of rainfall >0.5” in 24 hrs Documentation of changes in SWPPP

Penalties/EnforcementPenalties/Enforcement

PCA will be increasing PCA will be increasing enforcementenforcement SWCD’s, Watershed Districts can be SWCD’s, Watershed Districts can be

authorized agents for PCAauthorized agents for PCA

You will need to produce the You will need to produce the SWPPP and inspection reportsSWPPP and inspection reports

Penalty for non-conformance is Penalty for non-conformance is $10,000 per day per violation$10,000 per day per violation

Erosion Control

Jail

Erosion Control BMP’sErosion Control BMP’sRequired by NPDESRequired by NPDES

INLET PROTECTION

GEOTEXTILE FABRIC

MAINTENANCE OF SILT FENCE OR IF ADDITIONAL BMP’S

MAY BE REQUIRED

ROCK CONSTRUCTION ENTRANCE TO REDUCE SEDIMENT TRACKED OFF SITE

FINAL STABILIZATION

DESIGNATED WASH-OUT SITE

CATEGORY 1 BLANKET, TEMPORARY SEED, AND SILT FENCE MAINTENANCE

AFTER

Sediment tracked off site or on streets must Sediment tracked off site or on streets must be removed with 24 hoursbe removed with 24 hours

Silt fence Silt fence repaired, repaired, replaced when replaced when down or sediment down or sediment reaches 1/3 reaches 1/3 height of fence height of fence w/i 24 hoursw/i 24 hours

Other NPDES requirementsOther NPDES requirements Silt fence repaired, replaced when down or sed Silt fence repaired, replaced when down or sed

reaches 1/3 height of fence w/i 24 hoursreaches 1/3 height of fence w/i 24 hours Temp and perm basins must be drained and Temp and perm basins must be drained and

cleaned out when ½ storage volume is gone w/i cleaned out when ½ storage volume is gone w/i 72 hours72 hours

Sed deltas, filled CB’s, filled ditches must be Sed deltas, filled CB’s, filled ditches must be cleaned/stabilized w/i 7 dayscleaned/stabilized w/i 7 days

Sed tracked off site must be removed with 24 Sed tracked off site must be removed with 24 hourshours

Other NPDES requirementsOther NPDES requirements If sed in lakes, wetlands, streams, stabilize area If sed in lakes, wetlands, streams, stabilize area

upstream and remove sed w/i 7 daysupstream and remove sed w/i 7 days Hazardous materials stored appropriatelyHazardous materials stored appropriately No dumping of oil, junk, etcNo dumping of oil, junk, etc Garbage must be disposed of properlyGarbage must be disposed of properly Once site has undergone final stabilization, NOT Once site has undergone final stabilization, NOT

submittedsubmitted

Other inspection requirementsOther inspection requirements Seeding timeline w/i 200 feet of surface waterSeeding timeline w/i 200 feet of surface water

Slope steeper than 3:1 – 7 daysSlope steeper than 3:1 – 7 days Slope 10:1 to 3:1 – 14 daysSlope 10:1 to 3:1 – 14 days Slope flatter than 10:1 – 21 daysSlope flatter than 10:1 – 21 days

Surface water is stream, lake, wetland, ditches, Surface water is stream, lake, wetland, ditches, ponds, whether natural or artificial.ponds, whether natural or artificial.

Stockpiles need silt fenceStockpiles need silt fence Riprap at pipe ends w/i 24 hours of connectingRiprap at pipe ends w/i 24 hours of connecting Dewatering – Water must be directed to storm Dewatering – Water must be directed to storm

water pond or treated before dischargewater pond or treated before discharge

Questions?Questions?