Biological Assessment (BA) for the Brightwater Wastewater Treatment Plant

Categorized Under: Environment



ICF prepared a Habitat Conservation Plan (HCP) for submittal to National Marine Fisheries Service (NMFS) and the U.S. Fish and Wildlife Service (USFWS) for all of King County’s wastewater treatment and transport facilities.

The HCP was an extensive effort covering all of the county facilities such as pipelines, pump stations, wastewater outfalls, combined sewer overflows, stormwater discharges, and other programs such as an extensive infiltration and inflow (I&I) analysis, water reuse program, and other activities. The HCP evaluated target species including terrestrial and aquatic species that were either likely to be proposed, proposed for listed, or listed. It evaluated stream and riparian habitats, marine and freshwater communities, siting, construction and operation, and all potential interactions between the county’s facilities and sensitive species.

The overall goal of the plan was to provide an accepted level of operation for the King County Wastewater Treatment Division (WTD), which—in concert with certain prevention and restoration measures—would be suitable for the issuance of a permit under Section 10 of the Endangered Species Act (ESA). This was the first HCP prepared for chinook salmon since their listing in a highly urbanized location such as the Seattle area.

The Biological Assessment (BA) prepared by ICF was incorporated into the construction specifications, which were then able to clearly define responsibilities for implementation. This in turn reduced the need for a high contingency to cover potential costs during construction, resulting in substantial savings to the project owner.

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Insight Details

Client: King County Wastewater Treatment Division
Location: WA

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