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EXH AR023630: STIA Ground Water Study — Public Participation Plan

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Sea-Tac Airport
Third Runway
PCHB
Box 10

This 1999 plan, prepared jointly by the Washington State Department of Ecology and the Port of Seattle, outlines how the public will be involved in a ground water study at Seattle-Tacoma International Airport. The study was prompted by decades of jet fuel and petroleum product releases from underground storage tanks and fuel systems in the Airport's Aircraft Operations and Maintenance Area, which contaminated soil and ground water across 13 known sites. The plan describes required and additional public participation activities, community outreach roles, and the two-phase study approach, which included computer modeling of ground water flow to assess contamination risks to public water supplies and surface water.

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Public Participation Plan for the Sea-Tac Airport Ground Water Study, prepared jointly by the Washington State Department of Ecology (Ecology) and the Port of Seattle in May 1999. Documents a voluntary Agreed Order under the Model Toxics Control Act (MTCA, RCW chapter 70.105D) requiring the Port to conduct a comprehensive ground water study and pollution prevention activities for Airport fuel systems in the Aircraft Operations and Maintenance Area (AOMA), a 1/2-square-mile (320 acres) zone with thirteen known contaminated areas. Primary contaminants identified include jet fuel, gasoline, industrial solvents, mineral spirits, lubricating oil, and aircraft deicing fluids released from underground storage tanks and fuel distribution piping. Plan outlines roles and responsibilities, points of contact, required and additional public participation activities, community profile, and community concerns. Exhibit AR023630–AR023632.

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