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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:
Conditions of Use
Design and Installation Specifications
Note that the “Conditions of Use” refers to site conditions. As site conditions change, BMPs must be changed to remain in compliance.
2012 Stormwater Management Manual for Western Washington, as Amended in December 2014 (The 2014 SWMMWW)