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*y ` <br /> Will <br /> SOIL GAS SURVEY <br /> HOLT BROTHERS TRACTOR COMPANY <br /> STOCKTON, CALIFORNIA <br /> 1.0 Z.EMODUCTION <br /> The Holt Brovhera Tractor Company is a farm equipment dealership <br /> located in Stockton, CaliZornia (Figure 1). Activities conducted at this <br /> facility include the maintenance and repair of farm equipment. Seven <br /> underground storage tanks (USTs) used for storing hydraulic oil, hydraulic <br /> solvents, oils, waste oil, gasoline and diesel fuel were also included <br /> within this facility. <br /> In May 1988, tht. seven USTs were removed from the facility. Dui 111' <br /> excavation of the tanks, evidence of leakage from the tanks was noted and <br /> coil staining by hydrocarbons was reportedly observed. In December 1988, a <br /> Phase I Site Investigation was conducted by Dames & Moore at the Holt <br /> Brothers facility -Dames 6; Moore, 1989). During this investigation, fotir <br /> observation wells were installed in the vicinity of the seven cormer USTs <br /> .(Figure 2). Results from soil and ground water samples collected from these <br /> Dwells showed that only one well, MW-1, had detectable concentrations of <br /> hydrocarbon constituents in the sail. In addition, only wells MW-2 and 14W-2 <br /> had detectable concentrations if hydrocarbons in ground water, <br /> -- In June 1989, a soil gag survey was conducted by Dames & Moore at; one <br /> Holt Brothers facility for. the purpose of further investigating the extent <br /> of the hydrocarbon plume in the soil and ground water below the site. The <br /> purpose of this soil gizs survey was to provide i_iformatioa which would then <br /> be used to plan a Phase 11 Site Investigation. <br /> i; <br /> LD01.046 1 <br /> r <br /> lilt i <br />