Temporary Erosion and Sediment Control Manual
The Temporary Erosion and Sediment Control Manual (TESCM) replaces Chapter 6 and Appendix 6A of the Washington State Department of Transportation (WSDOT) Highway Runoff Manual. It outlines WSDOT’s policies for meeting the National Pollutant Discharge Elimination System (NPDES) Construction Stormwater General Permit requirements and the requirements in Volume II of the stormwater management manuals published by the Washington State Department of Ecology.
The TESCM is intended for use during the design, permitting, and construction phases of transportation construction projects. It covers:
- TESC plan design and implementation
- TESC BMP application and installation
- SPCC plans
- Discharge sampling and reporting
- Site management and documentation
- Compliance-related issues
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Improved access to 98.2 miles of upstream fish habitat
through 15 fish passage projects in 2021.
28% increase in the value of exports and imports
from $90.2 billion in 2020 to $115.5 billion in 2021.