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INTERIM REMEDIAL AC'T'ION PLAN <br /> 4491 West Durham Ferry Road <br /> Tracy, CaLfomia <br /> Delta Project No 40-91-732 <br /> 1 Page 3 <br /> 2.2 Site Backs round <br /> Ms Stella Ruiz purchased the property from Mr Eugene Heitt in May 1986 In February 1988, Petro <br />' Check removed two 1,000-gallon underground storage tanks which had contained leaded and unleaded <br /> gasoline Apparently, chemical analysis of soil samples collected from the tank excavation indicated that <br />' further investigation was required <br /> On May 27, 1988, monitoring well MW-1 was installed north of the tank locations by Water Works <br /> A ground water sample was collected on June 13, 1988, from monitoring well MW-1 and analyzed for <br /> petroleum constituents The results of the chemical analysis indicated concentrations of 1 6, 16 5, and <br />' 247 parts per billion(ppb)for benzene, toluene, and total petroleum hydrocarbons, respectively Further <br /> investigation was requested by the County of San Joaquin in a letter dated June 11, 1991 <br /> On July 26, 1991, Delta submitted a Phase I Hydrogeologic Investigation Work Plan to Ms Eleanor <br /> Ratliff of the County of San Joaquin (the County)to characterize the presence of petroleum hydrocarbons <br /> at the site The work was completed, and a Phase I Hydrogeologic Investigation Report dated <br /> ' November 14, 1991, was prepared and submitted <br /> ' On May 20 and August 13, 1992, Delta submitted quarterly ground water monitoring reports to the <br /> County <br /> 2.3 Rgeonal Hydrogeology <br /> A regional map showing the ground water elevation contours for the unconfined aquifer for spring 1989, <br /> prepared by the San Joaquin County Flood Control and Water Conservation District, shows the direction <br /> ' of ground water flow is towards the north or northeast Depth to ground water is expected to be <br /> approximately 15 to 20 feet below the ground surface <br /> RPT045 TA <br />