SWPPP Stormwater Pollution Prevention Plan CreatingImplementing a Plan

SWPPP: Stormwater Pollution Prevention Plan Creating/Implementing a Plan for Compliance

SWPPP Purpose Montgomery County MD York County Conservation District CSE Magazine

Required Parts of a SWPPP S Drawings S Narrative

S 9. STORMWATER POLLUTION PREVENTION PLAN D. SWPPP – Narrative Contents and Requirements 8. Stabilize Channels and Outlets 1. Preserve Vegetation/Mark Clearing Limits 2. Establish Construction Access 3. Control Flow Rates 4. Install Sediment Controls 5. Stabilize Soils 6. Protect Slopes 7. Protect Drain Inlets 10. Control Dewatering 9. Control Pollutants 11. Maintain BMPs 12. Manage the Project 13. Protect Low Impact Development (LID) BMPs E. SWPPP – Map Contents and Requirements 5

Narrative ◦ Project description ◦ Existing site conditions ◦ Potential erosion problem areas ◦ 13 Elements– include type of BMP(s) ◦ Construction schedule and phasing ◦ Contingency plan ◦ Engineering calculations ◦ CESCL contact info and expiration of certification

Drawings- Vicinity Map

Drawings- Site Map ◦ Direction of north, property lines, and existing structures and roads ◦ Cut and fill slopes ◦ Approximate slopes, contours, and direction of stormwater flow before and after major grading activities ◦ Areas of soil disturbance and areas that will not be disturbed ◦ Structural and nonstructural controls (BMPs) ◦ Locations of off-site material, stockpiles, waste storage, borrow areas, and vehicle/equipment storage areas

Drawings- Site Map (continued) ◦ Surface water bodies, including wetlands ◦ Stormwater or non-stormwater discharges off-site ◦ Sampling locations ◦ Areas of final stabilization ◦ LID facilities

SWPPP Site Map Simple Site

SWPPP Site Map Complex Site

Preparing a SWPPP Step 1: Data Collection 1. 2. 3. 4. 5. 6. 7. 8. Topography Drainage Soils Ground Cover Critical Areas Adjacent Areas Existing encumbrances Precipitation records

Preparing a SWPPP Step 2: Data Analysis

Preparing a SWPPP Step 3: SWPPP Development and Implementation

What is a BMP? “schedules of activities, prohibition of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of the waters of the state. BMPs also include treatment requirements, operating procedures, and practices to control plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material storage. ” WAC 173 -226 -030 (3)

Two Categories of BMPs in SWMMWW ◦ Source Control ◦ Runoff Conveyance & Treatment

Source Control BMPs Prevent or minimize generation of pollutants. Sediment: reduce or stop erosion of soil p. H: control and contain sources of high p. H Chemicals: contain and cleanup

Protect soil from erosion in traffic areas: rocked construction areas

Protect soil from erosion: hydroseeding & track walking

Control sources of high p. H: concrete truck washout area

Control sources of chemicals: cover and contain, be prepared for cleanup

Runoff Conveyance and Treatment BMPs • Reduce or stop erosion of soil while conveying water. • Treat water to settle suspended sediments prior to discharge from the site.

Runoff Conveyance BMPs Interceptor Swale with Channel Lining and Check Dams Pipe Slope Drain

Stormwater Treatment BMPs Filter Fence Sediment Pond

All Sites Require Multiple BMPs Coir Blanket Compost Sock Silt Fence Seeding Jute Netting Coir Logs The right BMP, in the right place, at the right time!

Most Important BMP = CESCL • Inspections • BMP review • Sampling and reporting • SWPPP updates

Ecology Stormwater Management Manual for Western Washington

The Key to a Successful SWPPP is… S S Site Assessment & Analysis Proper BMP Selection Implementation Inspections & Documentation Adaptive Management