EXH0072017691

PCHBPollution Control Hearings Board of the State of Washington

This Agreed Order ("Order") is issued pursuant to the authority of RCW 70.105D.050(1). If. Findings of Fact Ecology makes the following Findings of Fact, without admission of such facts by the Port of Seattle. 1. Seattle-Tacoma International Airport (STIA) is a major commercial air facility serving the Pacific Northwest. The Port of Seattle (Port) has owned and operated STIA since it opened in 1944. Airport operations, including passenger terminal operations, baggage and cargo handling, ground transportation, aircraR maintenance, and fueling storage and delivery have been conducted at STIA since its opening within an area of about 1/2 square mile in the southeast quadrant of the airport. This 1/2 square-mile area will subsequently be referred to in this Agreed Order as the "Aircraft Operations and Maintenance Area (AOMA)." Ap'tedOn_ - l - May 1999 Put ofStartle Sa.Tac lmmmtional AR 017691 • it -. 2. Hazardous substances have been released at times within the AOMA during some of these airport operations. By bulk volume, the most abundant contarninant.i.sjet fuel. Other known contaminants include, pdrnarily, gasoline, but also some industn'a] solvents, mineral spirits, lubricating oil, and aircraft deicing fluids. At tlds time, thirteen separate areas (sites) within the AOMA are known to have contaminants present in perched ground water and/or significant soil contamination (Appendix 1). Ground water in the Qva aquifer (see Section I1.3 below) is also impacted at eight of the thirteen sites. Eight sites are impacted with jet fuel, two sites with gasoline, and three sites are impacted by more than…
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