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Report of Results Investigation of Agricultural Chemicals in Soil PureGroBrea Facility I a 1905 North Broadway Ave.,Stockton,CA 11"� Sierra-Pacific Project No.94-055.09 0 o 3.0 rREVIOUS IIYVESTIGAT ONS AND SITE ASSESSMENTS Historical records indicate that limited soil sampling programs have been completed at the former PureGroBrea facility. Previous environmental investigative work was initiated by former and current operators to determine if pesticides and fertilizer products were present in soils near product loading areas, former evaporation ponds, and aboveground storage tanks. Potential areas of concern were referenced in a March 12, 1997 letter from RWQCB, and were also identified by site observations, employee interviews, or identified product releases (see Figure 3). The areas of concern include two former unlined evaporation ponds (referred to hereinafter as the north and south ponds), a former underground storage tank,an abandoned oil/water separator,three dry wells,a former tank farm and mix plant area, a former wash rack area, a drum storage area, a paint booth, and the current wash rack area. In 1981 Union Oil Company analyzed the sludge from the north pond on the Brea(northerly) portion of the current site. Nitrogen concentrations ranged from 34,000 to 95,000 milligrams per kilogram (mg/kg). In 1985 Brea Agricultural (Brea) collected soil samples from four locations within the south pond,located in the PureGro(southerly)portion of the site. Pesticides including Ethion and Endosulfan, the nematode fumigant DBCP,and DDE,a by-product of breakdown of the insecticide DDT were found in soil south of the mix plant/tank farm area(Figure 3), at concentrations of less than I mg/kg. The soil west of the fumigant area had the herbicides Diuron,Linuron, and the pesticides Endosulfan, DDT and its breakdown by-product DDE,endrin aldehyde, and endosulfan sulfate,again all at concentrations less than 1 mg/kg. In 1987, 1,2-DCP was detected in water samples collected at two East Stockton water supply wells. RWQCB briefly investigated the PureGroBrea facility but found no 1,2-DCP in the production well at the Brea site. RWQC-P reports that in 1989 an underground storage tank,presumably a fuel tank, was removed from the site,but RWQCB does not have a report of this removal- In 1990,during construction i of the new tank farm, an abandoned oillwater separator and three dry wells were found. Soil samples were collected from a test pit. 1,2-DCP and petroleum hydrocarbon compounds (TPH) were detected. i Sierra-Pacific Groundwater Consultants, Inc. 4 i