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• 2.0 BACKGROUND 2.1 Site Description The site is located east of Highway 99 at 19825 North Highway 99 Road in Acampo, California. The facility has been used as a trucking storage area. Two 10,000 gallon diesel fuel underground storage tanks were operated at the site to provide fuel for the trucking operation. 2.2 Site History The site has been a truck storage/staging facility since the 1950s. Prior to this type of operation the land was vacant or agricultural in nature. 2.3 Prior Site Assessment On December 20, 1991 three fuel underground storage tanks were removed from at the property. The PHS/EHD staff inspection report noted that the tanks were in poor condition. Soils excavated during the tank removal were stockpiled on site. Water was observed in the tank excavation pit. Samples of the stockpiled soils and water were collected for analysis. Sample analyses indicated that4x4h-soil had been impacted by the diesel tank operations. Several site assessments and/or remedial activities have been performed at this location. Chemical Specialties was retained to perform bioremediation of the stockpiled soils and the residual soil in the vicinity of the tank excavation pit. The bioremediation program was initiated and was in operation during early 1992. The PHSIEHD requested that the in situ treatment program be discontinued. T & T Earth Services was retained to conduct soil sampling of the stockpiled soils and in the vicinity of the tank excavation pit. This testing was performed during July, 1992 to evaluate the diesel concentrations in both the stockpile and around the excavation. Four samples were collected from the stock pile for analyses for TPH as gasoline and diesel and for BTEX. Four soil borings were drilled and sampled in the vicinity of the tank excavation pit. Twelve soil samples were analyzed for TPH as gasoline and diesel, BTEX and EDB. Test results showed that diesel impacted soils were still present above agency designated action levels of 100 mg/kg as diesel in the stockpile and in the soils surrounding the excavation pit. Two supplemental soil borings were drilled and sampled in an effort to lower the sample analysis detection limits. This testing confirmed the presence of TPH as diesel in the shallow soils around the diesel tank underground storage tank area. Park Environmental Corporation conducted a limited soil sampling and analysis program on June 23, 1993 to evaluate whether significant concentrations of diesel fuel impacted soils 500311 2