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r <br /> 4 0 CONCLUSIONS AND RECOMMENDATIONS <br /> r <br /> No petroleum hydrocarbons were detected in soil and groundwater at location UST B1, adjacent <br /> to the former gasoline UST TriHydro recommends no further action for the UST B site <br /> Relatively low concentrations of petroleum hydrocarbons were detected in soil and groundwater <br /> samples from location BNK1, in the vicinity of the former Bunker The reported benzene <br /> concentration in the groundwater sample (0 013 mg/L) was only slightly above the USEPA <br /> maximum contaminant level of 0 005 mg/L. The potential source at this location has been <br /> closed in place including filling with pea gravel on July 28, 2003 as approved by San Joaquin <br /> ICounty Therefore hydrocarbon concentrations in groundwater would be expected to decline <br /> TnHydro recommends that a monitoring well be installed at this location and that groundwater <br /> ' sampling be performed to confirm that concentrations are declining When groundwater <br /> samples demonstrate a declining trend for two consecutive events, TnHydro recommends the <br /> Bunker site be closed with no further action <br /> 1 <br /> r <br /> 1 <br /> 1 <br />� 1 <br /> 1 <br /> r <br /> 1 <br /> r <br /> • <br /> 1 <br /> 4-1 <br /> H%prodecta%$preckelslTracyWipaIN4RPT doc <br />