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EXH 358: Increasing Hardness Effect on Freshwater Acute WQ Standards — Copper & Zinc, WAC 173.201A.040

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Sea-Tac Airport
Third Runway
PCHB
Box 09

This document is a February 2002 fax from Water Resources Consulting LLC addressing the effect of increasing water hardness on fresh water acute water quality standards, referencing WAC 173.201A.040. It contains tables calculating acute water quality standards for copper and zinc at varying hardness levels in fresh water. The document appears to be part of an administrative record (AR 021262) and was transmitted between consultants, though its connection to Sea-Tac Airport noise policy is not evident from the content.

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Exhibit 358 (AR 021262), faxed 13 Feb 2002 from Water Resources Consulting LLC to Rick Poulin at Smith & Lowney (fax 206-860-4187), presents calculations on the effect of increasing hardness on fresh water acute water quality standards under WAC 173.201A.040 for copper and zinc. Tables show hardness values (mg/l), exposure factors, WQC (water quality criteria) concentrations in ug/l for copper (acute) and zinc (acute) at hardness levels of 19, 42, 47, 48, and 110 mg/l. Document relates to PCHB third-runway EIS proceedings and water quality analysis for Sea-Tac Airport.

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