Short Elliott Hendrickson Inc. April A. Ryan, PE.

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Presentation transcript:

Short Elliott Hendrickson Inc. April A. Ryan, PE

MS4 (Municipal) Reissued Aug. 1, 2013 Industrial Construction Reissued Aug. 1, 2013

Illicit Discharge Detection & Elimination New Requirements = New Ordinance What the City will be Looking for.

Construction Site Stormwater Management Best Management Practices to Minimize Erosion Construction Phasing, Buffers, Slope Draining, Slope Grading Delineate Areas not to be Disturbed Stabilize Exposed Soils (14 days, 7 days, 24 hours-200 ft) Energy Dissipation (24 hours)

Construction Site Stormwater Management Best Management Practices to Control Sediment Inlet Protection, Vehicle Tracking, Perimeter Control Additional and Redundant BMPs Prior to Land Disturbing Activities Stockpile Sediment Control Minimize Compaction Preserve Topsoil 50 Buffer from Surface Waters Chemical Sedimentation Treatment

Construction Site Stormwater Management Dewatering Activities Sedimentation Basins Oil-Water Separators Protect Discharge Points from Erosion & Scour

Construction Site Stormwater Management Inspections & Maintenance Trained Persons Every 7 Days and 24 hours after 0.5” Rainfall RECORDED in Writing within 24 hours Retained Onsite Perimeter Control – ½ Height Sediment Basins – ½ Full Construction Exits/Entrances – 24 Hours Infiltration Areas

Construction Site Stormwater Management Management of Solid and Hazardous Waste Storage, Handling, Disposal Under Cover Materials with potential to leach Pesticides, Herbicides, Fertilizers, Landscape Materials Hazardous & Toxic Sealed Containers with Limited Access Fueling & Maintenance of Equipment & Vehicles Vehicle and Equipment Washing Concrete and Other Washouts Effective Containment Cannot Contact Ground Signage

Construction Site Stormwater Management Final Stabilization Soil Disturbing Activities Completed 70% Vegetative Cover Erosion and Sediment BMPs Removed Residential Lots Structure(s) Complete Temporary ESC Down Grade Perimeter Control Sold

Post-Construction Stormwater Management BIG CHANGES MS4 PermitConstruction Permit - No Increase / Reduction- Volume Reduction * Volume, TSS, TP* MORE INFILTRATION BMPs

Post-Construction Stormwater Management PROTECT DURING CONSTRUCTION CONSTRUCT / GRADE LAST CONPACTION SEDIMENT SCARIFY BOTTOM 12” MIN.