February 13, 2002August 7, 2026

EXH AR021135: Increasing Hardness Effect on Freshwater Acute WQ Standards WAC 173.201A.040 — Copper & Zinc

This document presents a technical analysis of the effect of increasing water hardness on Fresh Water Acute Water Quality Standards, referencing WAC 173.201A.040. It includes calculated values for copper and zinc acute water quality criteria at varying hardness levels (ranging from 10 to 110 mg/L), showing how the allowable concentrations change as hardness increases. The document was transmitted via fax in February 2002 from Water Resources Consulting LLC.

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Fax from Water Resources Consulting LLC to Rick Poulin (fax 206-860-4187), dated 13 Feb 02, presenting calculations on the effect of increasing hardness on fresh water acute water quality standards under WAC 173.201A.040. Tables show WQC (water quality criteria) values for copper and zinc at hardness levels of 10, 42, 47, 48, and 110 mg/L, with exponent, slope, and intercept values derived from the standard formula. Filed in PCHB Third Runway EIS administrative record as AR 021135.

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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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