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Work Plan—PEA Page 5 Former Haley Flying Service GPE Project 474.2 The area believed to be most at risk of having been impacted by a release(s) of agricultural chemicals is the soil around, and under, the washout pit and the area adjacent to, and under, the aircraft-loading pad. The ESA recommended that soil sampling be conducted to assess the distribution of various contaminants and that DTSC and the San Joaquin County Environmental Health Department be contacted to determine was steps would be needed to investigate the known and suspected releases. 1.3 Site Status A search of State and Federal environmental databases completed by EDR identified Haley's Flying Service in several databases. In addition to the Cal-Site listing, the California Regional Water Quality Control Board (RWQCB) determined that the operation of the concrete washout pit was not in compliance with regulations regarding toxic waste pits and the site is listed in the WMUDS database. The site was also the subject of an investigation of a leaking underground fuel tank, but the release was adequately mitigated and subsequently was officially "closed". Haley's Flying Service is further identified in the AST list as the site of a permitted 10,000-gallon aboveground tank. The address associated with this listing is on Tracy Boulevard suggesting that the tank was actually located at another facility operated by the partner of Mr. Haley. The current owner of the property reports that no such tank was ever present and no evidence was found to indicate that a 10,000-gallon aboveground fuel tank was ever used on the site. Given the large indicated size compared to the relatively small scale of the operation, and the relative costs involved, it would seem unlikely that such a large tank would have ever been used at the site. Moreover, given that until 1990 (after crop dusting operations ended) underground tanks were present, it would seem to make little sense to operate a large aboveground tank. Records on file with the San Joaquin County Environmental Health Department (SJC-EHD) include a report of a 2001 site inspection that revealed the presence of drums of hazardous waste, apparently consisting of an oil/diesel/water mixture. A "notice to abate" was issued. In addition to these conditions, records on file with the San Joaquin County Office of Emergency Services and the Environmental Health Department indicate that an emergency response team mobilized to the site on August 8, 2001. A surface release of at least 110 gallons of oil, water, and diesel fuel occurred on the premises occupied by Continental Express. The impacted soil was removed and placed in 55-gallon drums for off-site disposal. The point of release was in front of the westerly hangar. A notation on the incident report indicates additional investigation of the soil will be needed but there is no evidence to suggest this work was ever undertaken. The site was originally placed on DTSC's Cal-Site list because of a 1981 fire that caused a pesticide spill from ruptured containers stored in a hanger. A recent review of DTSC records indicates, however, that such a fire never occurred on this property. The fire in question was at another airstrip about 5 miles away. Based on this information, the DTSC was asked to reconsider the Cal-Site listing, but agency personnel indicated that the past use of the site for 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 Modesto, Ca 95356 Fax: (209)569-0295