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Erosion Control

   Example of erosion control measures at Port of Tacoma

Temporary erosion and sediment control measures
may include blankets, check dams and vegetation.

WSDOT must seek coverage under the NPDES Construction Stormwater General Permit (CSWGP) for any construction projects that engage in clearing, grading, or excavating activities that disturb one or more acres of soil and have the potential to discharge into surface waters of the state. WSDOT develops and implements procedures to minimize the impacts of erosion and sedimentation, such as:

  • Contract language and guidelines to meet CSWGP requirements.
  • Temporary Erosion and Sediment Control (TESC) plans, Spill Prevention, Control, and Countermeasures (SPCC) plans, site inspections, and adaptive site management.
  • Construction site discharge sampling, data reporting, and compliance tracking.
  • Statewide erosion and sediment control training of WSDOT personnel.
  • Annual erosion control site assessments (internal auditing).

Successful erosion control planning and implementation is based on a strong partnership and proactive communication between WSDOT's Regional Environmental Offices, Headquarters Programs, Project Engineer Offices, and the contractors.

TESC Planning and Construction Site Discharge Sampling

WSDOT construction projects covered by the CSWGP are required to:

  • Develop a TESC plan and SPCC plan that will meet the Stormwater Pollution Prevention Plan (SWPPP) requirements of the CSWGP.
  • Implement, inspect, and maintain sediment, erosion, and pollution control measures on site.
  • Report stormwater discharge data from construction projects that enter surface waters of the state.

The Temporary Erosion and Sediment Control Manual (TESCM) describes WSDOT's procedures for meeting the requirements of the CSWGP. A TESC Manual Listserve group has been created for interested parties who wish to receive e-mail announcements on updates to the TESCM.

WSDOT requires all staff and contractor personnel performing CSWGP related site inspections and/or discharge sampling to have a current Certification for Erosion and Sediment Control Lead (CESCL). Contractor staff seeking certification to perform such activities must receive training from a Department of Ecology approved training provider.

Monthly reporting requirements begin as soon as the CSWGP is issued, even if construction has not started or no discharge has occurred. Monthly reporting must continue until CSWGP coverage is terminated. Use the Discharge Monitoring Reporting (DMR) Procedures (pdf 276 kb) guidance document to ensure monthly reporting requirements are met.

For more information contact:

Elsa Pond, 360.570.6654


A Contract Requirements Checklist to Transfer the CSWGP (pdf 108 kb) is available to help those developing contracts navigate the General Special Provisions and contract documents needed for inclusion with the contract.