EXH1122042458

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). II. Findingsof F._ct Ecology makes the following Findings of Fact, without admission of suchfacts by thePort of Seatde. 1. Seattle,-TacomaInternational Airport(STIA) is a major coaunercia[air facility serving the PacifioNorthwest. ThePort of Seattle (Port) has owned and operated STIA since it opened in 1944. Airport operations, including pass_ger terminal operations, baggage and cargo handling, ground transportation, aircraRmaintenance, and fueling storage and deliw,_/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-m/Is area will subsequentlybe referred to in this Agreed Order as the "AircraR Operations andM._intenmce Area (AOMA)." AR 042458 ,Asn_1Order - I- May1999 ,tort ef t,_ttle b%a-Ta=Intm_eml Ai_oct _'d E_E'ON 3711U3S AO INOd NUB#:6 20OE'#T'NUN q F. 2. B_zardous substances have been released at times within the AOMA duringsome of these airport operations. By bulk volume, the most abundant contaminant isjet fi:el. Other known contaminants include.,primarily, gasoline, but also some industrial solvents, mineral spirits, lubricating oil, and aircraft deicing fluids. At this 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). Groundwat_ in the Qva aquifer (see Section 123 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 one contaminant. There are also some small areas With.inthe AOMA where…
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