I-405: I-5 to SR-167 Stage I Widening D/B

Aerial photo: I-405: I-5 to SR-167 Stage I Widening D/B

PBS provided on-site full-time environmental compliance inspection and is acting as the environmental compliance manager on the 1-405, I-5 to SR-167 Stage I Widening Design-Build Project. The project will add one northbound and one southbound lane to I-405 between I-5 and SR-167, one southbound lane on SR 167 between I-405 and S 180th Street, and extend the southbound SR-167 HOV lane from I-405 to the existing start of the HOV lane.

As the first stage in a long-range plan, this project will reduce the congestion on and increase the capacity of I-405 between I-5 and SR-167. The additional lanes on I-405 will increase the I-405 general purpose roadway capacity by fifty percent. Interchange improvements will also relieve congestion.

PBS’ team has worked full-time from the Renton field office to facilitate compliance with permits, interagency agreements/memorandums, and agency directives. In 2010, PBS received the WSDOT Partnership for Environmental Excellence in Construction Management Award for the work we did on this project.

Washington Department of Transportation
Seattle, Washington

Scope of Services:

  • Environmental Compliance Plan
  • Preparation
  • Construction Monitoring
  • Documentation & Reporting
  • Regulatory Agency Coordination
  • Wetlands Delineation
  • Water Quality Monitoring
  • Stream Diversion Oversight
  • Training
  • Stream Mitigation Design
  • Permitting
  • Roadside Restoration Design
  • Erosion Control Monitoring
  • Environmental Reporting
  • Vegetation Monitoring