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' MW-3A were presented by Mittelhauser in the report entitled Monitoring Well MW-3A <br /> Installation Report dated December 3, 1993 (Appendix B) <br /> 60 CONCLUSIONS <br /> The majority of the petroleum hydrocarbon affected soil above the water table in the <br /> ' vicinity of the former gasoline and waste oil USTs, and the oil drum storage area, was <br /> removed during the over-excavation program following the removal of the gasoline <br /> USTs The minor levels of residual petroleum hydrocarbons in the unsaturated soil <br /> should not pose a threat to the environment Unocal formally petitions the San <br /> ' ,Joaquin County Health Department for no further action on soils at this site <br /> ' The heavily-affected soil up to 3 feet below the water table was removed and 1 ,320 <br /> gallons of contaminated groundwater were pumped out of the UST excavation <br /> ' Therefore, the current level and extent of residual hydrocarbons below the water table <br /> (dissolved and adsorbed to the soil) appears to be relatively small and are not <br /> considered a threat due to potential migration to offsite locations <br /> ' 7,0 RECOMMENDATIONS <br /> ' Based on the results of the confirmation soil samples obtained from the site <br /> excavations (USTs, product lines, pump islands, and hoists), it is recommended that <br /> ' the site be considered for no further action and closure with respect to the soil above <br /> the water table In addition, it is recommended that no further action be taken with <br /> ' respect to residual hydrocarbons in the soil and that monitoring and sampling of the <br /> four onsite monitoring wells should continue on a quarterly basis during 1994 <br /> Following the 1994 monitoring and sampling, the site groundwater conditions should <br /> be reevaluated to determine the need for continued monitoring and sampling <br /> 1 <br /> 1 <br /> 8 / C�ittelhauser <br /> p O R P O R A T I O N <br /> P21 SOR006 wp(03l941 <br />