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Following a thorough review of these documents, IT contacted Wendy Wyels of CRWQCB to clarify certain aspects of the case record and to ensure the proposed work scope was satisfactory. 1.1 Site Description The Cal-Farm Supply Site is located at 1922 and 2040 West Washington Street, next to the Port of Stockton in San Joaquin County, California(Figure 1). The site consists of a warehouse and fenced sales yard, and an open field located to the south and to the east of the yard. According to the Phase II Site Investigation and Site Closure Report prepared by Kennedy/Jenks/Chilton in June 1991, the warehouse and sales yard were used for the temporary storage, sale, and distribution of pesticides, fertilizers, and agricultural equipment. Specifically, the warehouse ' was used to dilute bulk DDT to application strength. Excess DDT was allegedly swept out of the southern door of the warehouse. One 1,000-gallon underground storage tank(UST) containing ' diesel and three above ground pesticide storage trailers were present in the storage yard. The storage yard and warehouse have not been used since 1985. ' 1.2 Project History In April and May 1989, a preliminary site investigation was conducted by Kennedy/Jenks/Chilton. This investigation included the collection and analyses of surface soil from the sales yard, the collection and analyses of subsurface soil and groundwater from two soil borings (B-1, B-2,) and four newly installed groundwater monitoring wells(MW-1 through MW-4), and an inventory of the contents in the three storage trailers. Soil boring and monitoring ' well locations are illustrated on Figure 2. In summary, the results from the preliminary site investigation'identified the presence of DDT in concentrations exceeding 1,000 parts per billion(ppb) in four discrete surface soil samples. ' Two of the samples were collected from the soil south of the fenced sales yard and two of the samples were collected from the soil east of the eastern access door to the warehouse. In addition, petroleum hydrocarbons and low concentrations of nitrates were identified in the subsurface soil and groundwater in the vicinity of the diesel UST. The lateral extent of these chemicals in groundwater was not determined. Detailed analytical results are given in Tables 1, 2, and 3. The inventory of the storage trailers indicated that trailers 1 and 3 were empty and ' trailer number 2 contained several 5-gallon containers of pesticides which appeared to have leaked. 2 1