City of Port Angeles, Combined Sewer Overflows (CSO) Reduction Phase I

Project overview

Vanir served as the project and construction manager for the CSO Reduction Phase I project, the largest public works construction project to date for the City of Port Angeles. This phase included installation of over 16,000 linear feet of HDPE force main and gravity sewer pipelines using a combination of innovative sliplining techniques and open-cut trenching along the Olympic Discovery Trail, which runs along the shoreline of Port Angeles. The work involved improvements to the trail and bridges along the path, plus construction of a new 105-foot bridge over Ennis Creek. A vital part of this project was the rehabilitation and modifications to an existing five-million-gallon steel storage tank.

A challenging project delivered on time, on budget

A large portion of the project was located on the existing contaminated Rayonier Mill property that was a designated MTCA site by the Department of Ecology, requiring all demolition and excavation to be performed per requirements for hazardous materials handling and storage. This involved comprehensive monitoring, testing, inspection and material handling management during the course of all excavations on the project. Coordination of material handling eff orts with ongoing cleanup and containment activities on this site provided many logistical challenges. This site was also an extremely sensitive archaeological area for the Lower Elwha tribe, which required very extensive coordination, documentation and monitoring efforts.

This project was completed on time and within budget, with proactive coordination efforts from Vanir and the contractor and numerous cost savings to the City.



American Public Works Association – 2018 Project of the Year Award

Port Angeles, Washington
City of Port Angeles

Brown and Caldwell


IMCO General Construction

Construction Cost
$16.8 Million
Start Date
Completion Date