February 12, 2001August 2, 2026

EXH AR017506: WAC 173-340-740 MTCA Cleanup Regulation — Unrestricted Land Use Soil Cleanup Standards

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WAC 173-340-740 from the Model Toxics Control Act (MTCA) Cleanup Regulation, published February 12, 2001, establishing unrestricted land use soil cleanup standards. Covers Method A, Method B (standard and modified), and petroleum mixture cleanup levels including Equations 740-1 through 740-3 for noncarcinogens and carcinogens. Specifies default exposure parameters: soil ingestion rate 200 mg/day, average body weight 16 kg, exposure duration 6 years, hazard quotient 1, cancer risk level 1 in 1,000,000. References WAC 173-340-704, 173-340-708, 173-340-720, 173-340-745, 173-340-747, and 173-340-7490 through 173-340-7494. Addresses ground water protection, soil direct contact, soil vapor pathways, TPH (total petroleum hydrocarbons), gasoline range organics, diesel range organics, dermal absorption, and terrestrial ecological receptors.

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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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