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EXH AR025055: Email Chain — Acceptable Fill Criteria Language Draft 401 Certification STIA Third Runway

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This document is an email chain from June-July 2001 between Washington State Department of Ecology staff discussing acceptable fill material criteria for the Seattle-Tacoma International Airport Third Runway project. Officials debated whether to restrict fill to naturally occurring uncontaminated soils or to allow other materials subject to contamination testing standards, with recommendations including requiring the top six feet of fill to be clean natural soil and using Table 749-3 screening values to protect plants and animals. The discussion also addressed whether the state's Model Toxics Control Act (MTCA) standards should apply, including requirements for contaminant testing, groundwater monitoring, and terrestrial ecological evaluation.

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Email chain (June 12 – July 10, 2001) among Washington State Department of Ecology staff — Chung K. Yee, Peter Kmet, Kevin Fitzpatrick, Craig Thompson — discussing acceptable fill criteria language for the Draft 401 Certification for the Seattle-Tacoma International Airport Third Runway Master Plan Improvements. Kmet recommends against using MTCA (Model Toxics Control Act) alone for clean-fill criteria; proposes terrestrial ecological evaluation standards using Table 749-3 screening values, WAC 173-340-740 statistical methods, bioassay testing under WAC 173-340-7493(3)(b)(i), and requiring the uppermost 6 feet of fill to consist of clean naturally occurring soil meeting Ecology publication #94-115 ‘Natural Background Soil Metals Concentrations in Washington State.’ Document marked ‘DELIBERATIVE DOCUMENT CURRENTLY EXEMPT FROM PUBLIC DISCLOSURE.’ AR 025055–025057.

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