Stormwater Pollution Prevention Plans

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Presentation transcript:

Stormwater Pollution Prevention Plans

Objectives Know the brief legislative background of stormwater discharges Know what a SWPPP is and what is included in a SWPPP

Definitions SWPPP-Stormwater Pollution Prevention Plan NPDES-National Pollutant Discharge Elimination System SPDES-State Pollutant Discharge Elimination System MS4-Municipal Separate Storm Sewer System NOI-Notice of Intent Blue Book-”New York Standards and Specification for Erosion and Sediment Control”

History Water Quality Act-1987 Phase I Stormwater Regulations-1990 First regulations dealing with discharge of stormwater Phase I Stormwater Regulations-1990 NYSDEC is local permitting authority NYSDEC issued 2 general permits-1993 Industrial Site Runoff Construction Projects > 5 acres (Phase I) Phase II Stormwater Regulations-1999 Apply to Construction Projects > 1 acre

On-Line References New York State Stormwater Management Design Manual New York Standards and Specifications for Erosion and Sediment Control

General Permit Operator must submit NOI Operator must prepare SWPPP (water quality and quantity control) Operator is responsible for implementing all measures outlined in the SWPPP Inspections every 7 days and after a storm event of 0.5 inches or more Inspection summaries prepared by a “qualified professional” must be posted for view by the public. NYSDEC can fine up to $25,000 per day of violation

Maintaining Water Quality No increase in turbidity that will cause a substantial visible contrast to natural conditions No increase in suspended, colloidal and settleable solids that will cause deposition or impair the waters for their best usages No residue from oils and floating substances, nor visible oil film, nor globules of grease

Erosion Factors Soil Type Vegetative Cover Topography Climate Season Higher potential – silt and fine sand Lower potential –clays and organics Vegetative Cover Topography Climate Season

SWPPP-Contents Standards for Construction Activities Background project info Site Map Soil Description Construction Phasing Plan Pollution Prevention Measures Description of Construction and Waste Materials Temporary and Permanent Structural and Vegetative Measures

SWPPP-Contents (contents) Map showing control measures Details of control measures Identify temporary measures to be converted to permanent control measures Maintenance Schedule Name of receiving water Description of structural practices used to divert flows Description of existing data that describes the stormwater runoff characteristics at the site

Commonly Used SWPPP Measures Construction Entrance Mulching/Seeding Silt Fences Straw Bale Dikes Drop Inlet Protection Stone Check Dams Prefabricated Check Dams

Construction Entrance http://pasture.ecn.purdue.edu/~sedspec/sedspec/images/construction.jpg http://www.harfordcountymd.gov/dpw/eng&const/WaterResources/Images/Sedimentcont2.jpg

Erosion Control (Mulching/Seeding) http://www.terra-mulch.com/photos/11-11.JPG http://www.ssseeds.com/ecb/photos/WS05/images/WS05%202-1%20Over%20Mulch.jpg

Silt fences www.acfenvironmental.com/ bmp_siltfence.htm www.forestry.state.ar.us/ bmp/appn_soil.html

Straw Bale Dikes http://www.salmonhabitat.org/images/v3f52b.gif http://www.forester.net/images/ec_0103_p78_top.jpg

Drop Inlet Protection http://unix.eng.ua.edu/~rpitt/Class/Erosioncontrol/Module8/Module8_files/image050.gif http://www.greatamericantec.com/images/inlet.jpg

Blue Book—Storm Drain Inlet Protection Type I Excavated Drop Inlet Protection Type II Fabric Drop Inlet Protection Type III Stone & Block Drop Inlet Protection Type IV Curb Drop Inlet Protection

Blue Book—Type I Excavated Drop Inlet Protection

Blue Book— Type II Fabric Drop Inlet Protection

Blue Book— Type III Stone & Block Drop Inlet Protection

Blue Book— Type III Stone & Block Drop Inlet Protection

Blue Book— Type III Stone & Block Drop Inlet Protection

Stone Check Dams http://www.ncc-swnpdes.com/images/stone_creek_dam.jpg http://www.dfr.state.nc.us/images/wq/glossary/rockcheckdam.jpg

Other Check Dams http://www.lakemac.infohunt.nsw.gov.au/erosion/images/09051.gif http://www.wsdot.wa.gov/NR/rdonlyres/BA478915-1B80-4188-BB59-37358244CBDF/0/CheckDam_Jan05.jpg

Site Plan/Inspection Report Shows erosion control measures in relation to site Indicates areas that need permanent measures Indicates other action items based on inspection