November 14, 2002August 2, 2026

Exhibit 137: WAC 173-201A-050 Title 173 — Ecology, Department of — Ambient Water Quality Criteria Footnotes (Dissolved Metals, Cyanide, Ammonia)

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Exhibit 137 (AR 018038), WAC 173-201A-050, Title 173 Washington Administrative Code, Washington State Department of Ecology ambient water quality criteria footnotes. Covers dissolved metals criteria, weak acid dissociable cyanide method (Standard Methods 4500-CN I), total recoverable effluent limits, conversion factors, water effects ratio approach (USEPA Water Quality Standards Handbook December 1983), site-specific metals adjustment, seasonal partitioning of dissolved to total metals, trivalent chromium total recoverable, ammonia conversion tables (USEPA Quality Criteria for Water 1986; EPA440/5-88-004 April 1989), marine chronic concentration 21 µg/L, USEPA National Criteria 36 µg/L, WAC 173-220-060, WAC 173-226-110, WAC 173-220-050, WAC 173-226-130(3).

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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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