Waterfront Stormwater Treatment for Any Commodity Anywhere

The Port of Port Angeles (Port) operates and manages four deep-water marine terminals and associated support facilities on Washington State's Olympic Peninsula. The stormwater discharges from these facilities are covered under the Washington State Department of Ecology (Ecology) Industrial Stormwater General Permit (ISGP). Based on a facility's standard industrial classification code, the ISGP requires monitoring and reporting of and sets benchmark limits for select water quality parameters. In 2014, the port's Terminal 3 (T3) and Cargo Surge Area (CSA) facilities exceeded the benchmark limits for copper and turbidity, requiring the port to implement stormwater treatment. The port hired Kennedy Jenks (KJ) to evaluate different treatment alternatives and recommend a preferred alternative. Based on its analysis, bench-scale testing, and port-operated pilot-scale tests, KJ recommended and designed a non-proprietary three-stage biofiltration treatment system and associated drainage infrastructure improvements for T3 and CSA. Construction of the biofiltration system was completed in fall 2018, and performance monitoring for the 2018–2019 wet season is ongoing.