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Preliminary Endangerment Assessment Page 4 <br /> Former Haley's Flying Service <br /> GPE Project 474.2 <br /> 2.0 APPARENT PROBLEM <br /> The original PEA identified a limited area near the east end of the parcel where the shallow <br /> soil has been severely impacted with several agricultural chemicals. The primary <br /> contaminants are the DDT group, Dieldrin, and Toxaphene, although low concentrations of <br /> other chemicals are present as well. The area of most concern is the exposed soil <br /> surrounding and beneath the pesticide loading dock, and pad and the washout pit. The dates <br /> of the releases are unknown, but it is likely there were a series of small spills or leaks <br /> extending for many years from the 1950's and ending when flight operations ended in the <br /> late 1980's. <br /> Groundwater samples collected from two soil borings contained various pesticides, but these <br /> results were considered unreliable due to suspected cross-contamination. The groundwater <br /> sample results obtained for this addendum are considered to be much more reliable. Organo- <br /> chlorine pesticides, primarily Toxaphene, were detected in the groundwater in the vicinity of <br /> the severely impacted shallow soil. The groundwater contamination is believed to be a result <br /> of leaching of soil contaminants,possibly from the washout pit and loading dock. <br /> 2937 Veneman Avenue,Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto,Ca 95356 Fax: (209)569-0295 <br />