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Kennedy/Jenks/Chilton SECTION 1 ' SUMMARY OF PREVIOUS FACILITY INVESTIGATIONS ' BACKGRO€3ND The Cal -Farm Supply Stockton Facility (facility) is located at 1922 and ' 2040 West Washington Street in Stockton, California (APN 145-030-004,and 145-061-001, respectively) The location of the facility is shown on Figure 1 . The facility is comprised of two areas. The first area includes a warehouse and fenced sales yard. The second area is an open ' field located to the south and to the east of the yard (see Figure 2) According to former Cal -Farm employees, the warehouse andSales yard were used for the temporary storage, sale, and distribution of ' pesticides, fertilizers, and agricultural equipment (barbed wire, fencing materials, etc.) The sales yard also contained a 1,000-gallon underground diesel fuel storage tank, and three storage trailers The ' trailers were reportedly used to store unused quantities of pesticides. The location of the underground tank and the storage trailers are shown on Figure 3. ' Prior to the EPA ban on the use of DDT, a portion of the warehouse was reportedly used for the dilution of bulk DDT to an application strength mixture. Bulk DDT was reportedly delivered to the site in a concentrated form and was diluted or cut with an inert material It was reported that the standard operation for cleaning the formulation room floor was to sweep the excess DDT out of the southern door of the ' warehouse. According to a former Cal -Farm employee, the warehouse and sales yard have not been in use since 1985. PRELIMINARY SITE INVESTIGATION 1 In September 1988, Kennedy/Jenks/Chilton was retained by the Bankruptcy Trustee for Cal -Farm Supply to perform a preliminary site investigation of the warehouse and sales yard Previous sampling conducted by Roy F. Weston, Inc indicated that nitrates and total petroleum hydrocarbons were present in shallow (one to three feet deep) soil In addition, elevated concentrations of these chemicals were detected in a reconnais- sance groundwater sample A work plan to evaluate the possible presence of a source of nitrates and petroleum hydrocarbons 4ithin the sales yard was prepared by Kennedy/Jenks/Chilton. The Department of Health ' Services reviewed the work plan at the request of the San Joaquin Local Health District and recommended that analysis of surface soil samples for pesticides be added to the investigation. ' The preliminary site investigation was conducted during April and May of 1989. The results of this investigation are summarized in our report entitled Preliminary Site Investigation Report, Cal -Farm Supply Stockton Facility, dated 14 July 1989 The investigation included the following- ' WPI13 1.1 882526 01