September 1, 2001August 2, 2026

Exhibit AR026646: Response to Comment #16 — Fish-Specific Tissue Screening Concentrations for Lead, Zinc, and Copper in Miller Creek Cutthroat Trout

Notes

Memo from David DeForest to Linda Logan (September 2001, AR 026646) responding to Comment #16 regarding lead and zinc tissue screening concentrations (TSCs) in cutthroat trout from Miller Creek. Critiques Shephard (1999) TSCs of 0.32 mg/kg dw (lead) and 100 mg/kg dw (zinc) as derived from Dyer et al. (2000) and U.S. EPA water quality criteria (WQC) and bioconcentration factors (BCFs). Proposes alternative fish-specific TSCs using chronic toxicity data for brook trout (Salmo fontinalis), rainbow trout (Oncorhynchus mykiss), Atlantic salmon (Salmo salar), and fathead minnow (Pimephales promelas); concludes Miller Creek cutthroat trout lead concentrations (0.31, 0.74, 0.34 mg/kg dw) and zinc concentrations (137, 145, 129 mg/kg dw) do not exceed fish-specific TSCs of 4.9–14.8 mg/kg dw (lead) and 182–188 mg/kg dw (zinc).

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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