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PROBLEM ASSESSMENT REPORT <br /> 6131 Pacific Ave , Stockton, CA <br />' Aegis Ploject No 90-020 <br /> Page 12 <br /> J Data recovered from slug tests are an approximation of aquifer <br /> parameters and are used to estimate aquifer yields prior to <br /> designing a ground water recovery system. Typical slug test data <br /> is expected to be accurate to within one order of magnitude. <br /> 4.3 Petroleum Hydrocarbons in„Ground Water <br /> ,1a <br /> 4 . 3 . 1 Free Product <br /> Monitoring wells have been checked fro the presence of free P <br /> product and water levels have been obtained monthly since the MO <br /> monitoring wells were installed. Free product has not been <br /> detected in any of the monitoring wells. <br /> 4 . 3 . 2 Dissolved Petroleum Hydrocarbons <br /> Petroleum hydrocarbons were detected in ground water samples <br /> collected from all of the monitoring wells. The highest <br /> concentration of petroleum hydrocarbons in the ground water was <br /> found in the sample collected from MW-3 . MW-3 is located down <br /> gradient from the original tank basin. Petroleum hydrocarbons <br /> dissolved in ground water were also found in MW-1 and MW-2 . MW-1 <br /> and MW-2 are located up gradient from the original tank basin. <br /> The presence of petroleum hydrocarbons in MW-1 and MW-2 may <br /> indicate a potential off-site source is contributing to the <br /> deterioration of ground water quality beneath the site. <br /> Figure 7 presents contours of benzene concentrations in ground <br /> water from the analytical results of water samples collected on <br /> 7/23/90. The figure infers the off-site migration of petroleum <br /> hydrocarbons in ground water in a south and west directions. A <br /> zero line of benzene dissolved in ground water can not be <br />' inferred from the present data. <br />