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- <br /> J. H. KLEINFEL€DER &ASSOCIATES <br /> File: 'W-2006-1 <br /> March 18, 1986 <br /> Page 10 <br /> leaking underground tank have not migrated to soil below the <br /> proposed champagne tank foundation. <br /> The presence of gasoline related constituents in the shallow <br /> ground water was not addressed in this latest soil investigation. <br /> Data presented in J. H. Kleix.felder's "Soil and Ground mater <br /> Assessment Report", dated December 16, 1985, suggest that benzene, <br /> toluene, and xylene are present in the shallow ground water in the <br /> Immediate vicinity of the excavation area. <br /> �._ VII. H•Et-0M4SHDA X0XS <br /> Based on our findings we recommend the following additional <br /> assessment work: <br /> ,s <br /> o Gasoline is present in the soil at concentrations which <br /> exceed the State's current action level, which varies at <br /> . 100 or 1,000 mg/kg (depending on the region/county of the <br /> F state). As of this date, clean-up levels have not been <br /> established for the unsaturated soil. If it is determined <br /> that the presence of hydrocarbons in the unsaturated soil <br /> needs to be addressed, remedial actions should be <br /> Incorporated into a remedial ground water plan. <br /> + <br /> Conceptually, infiltration wells placed in the <br /> unsaturated zone could be incorporated with a series of <br /> ground water recovery wells at the site. Hydrocarbons <br /> would be flushed from the unsaturated soil, recovered in <br /> a series of extraction wells, treated through <br />