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Chapter II-4 - Best Management Practices Standards and Specifications

Best Management Practices (BMPs) are defined as schedules of activities, prohibitions of practices, maintenance procedures, and structural and/or managerial practices, that when used singly or in combination, prevent or reduce the release of pollutants to waters of Washington State. This chapter contains standards and specifications for temporary BMPs to be used as applicable during the construction phase of a project. Often using BMPs in combination is the best method to meet Construction Stormwater Pollution Prevention Plan (SWPPP) requirements.

None of the BMPs listed below will work successfully through the construction project without inspection and maintenance. Regular inspections to identify problems with the operation of each BMP, and the timely repair of any problems are essential to the continued operation of the BMPs.

II-4.1 Source Control BMPs contains the standards and specifications for Source Control BMPs.

II-4.2 Runoff Conveyance and Treatment BMPs contains the standards and specifications for Runoff Conveyance and Treatment BMPs.

The standards for each individual BMP are divided into four sections:

  1. Purpose

  2. Conditions of Use

  3. Design and Installation Specifications

  4. Maintenance Standards

Note that the “Conditions of Use” refers to site conditions. As site conditions change, BMPs must be changed to remain in compliance.

II-4.1 Source Control BMPs

BMP C101: Preserving Natural Vegetation

BMP C102: Buffer Zones

BMP C103: High Visibility Fence

BMP C105: Stabilized Construction Entrance / Exit

BMP C106: Wheel Wash

BMP C107: Construction Road/Parking Area Stabilization

BMP C120: Temporary and Permanent Seeding

BMP C121: Mulching

BMP C122: Nets and Blankets

BMP C123: Plastic Covering

BMP C124: Sodding

BMP C125: Topsoiling / Composting

BMP C126: Polyacrylamide (PAM) for Soil Erosion Protection

BMP C130: Surface Roughening

BMP C131: Gradient Terraces

BMP C140: Dust Control

BMP C150: Materials on Hand

BMP C151: Concrete Handling

BMP C152: Sawcutting and Surfacing Pollution Prevention

BMP C153: Material Delivery, Storage and Containment

BMP C154: Concrete Washout Area

BMP C160: Certified Erosion and Sediment Control Lead

BMP C162: Scheduling

II-4.2 Runoff Conveyance and Treatment BMPs

BMP C200: Interceptor Dike and Swale

BMP C201: Grass-Lined Channels

BMP C202: Channel Lining

BMP C203: Water Bars

BMP C204: Pipe Slope Drains

BMP C205: Subsurface Drains

BMP C206: Level Spreader

BMP C207: Check Dams

BMP C208: Triangular Silt Dike (TSD) (Geotextile-Encased Check Dam)

BMP C209: Outlet Protection

BMP C220: Storm Drain Inlet Protection

BMP C231: Brush Barrier

BMP C232: Gravel Filter Berm

BMP C233: Silt Fence

BMP C234: Vegetated Strip

BMP C235: Wattles

BMP C236: Vegetative Filtration

BMP C240: Sediment Trap

BMP C241: Temporary Sediment Pond

BMP C250: Construction Stormwater Chemical Treatment

BMP C251: Construction Stormwater Filtration

BMP C252: High pH Neutralization Using CO2

BMP C253: pH Control for High pH Water

Washington State Department of Ecology

2012 Stormwater Management Manual for Western Washington, as Amended in December 2014 (The 2014 SWMMWW)