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CONCLUSIONS FOR CASE CLOSURE The fuel hydrocarbon-contaminated soil remaining at the 305 South Hutchins Street site is situated largely below 20 feet bgs and above 42 5 feet bgs The contaminated soil is deep enough that it will have no adverse effect on the health of persons at the surface It could have an effect only if excavation at the site were to take place to near the depth of the shallowest contamination Such excavation would only come with a new land use of the site A sandwich shop is presently located on the site The results of SESOIL modeling indicate that leaching of fuel hydrocarbons to the saturated zone from the vadose zone beneath the 305 South Hutchins Street site is not likely The water table at the site is between S 5 feet and 14 5 feet deeper than the deepest fuel hydrocarbon-contaminated soil This significant vertical separation, which likely represents a steady-state condition given the long period of time since removal of the underground fuel tank system, is seen as evidence that leaching of fuel hydrocarbons to the saturated zone, from the vadose zone, has not occurred and is not likely to occur The nearest active water supply well (City of Lodi Well 3R, 1100 feet northwest of 305 South Hutchms Street) has not been affected by the fuel hydrocarbon contanunatnon in ground water ' beneath the active ARCO station at 501 West Lodi Avenue and the site at 305 South Hutchins Street Therefore,tlus present nearby beneficial ground-water use has not been adversely affected The fuel leak source has been removed from the 305 South Hutchins Street site The record of analyses of ground-water samples from wells at the site indicates a stable contaminant plume Health, ground-water quality, and beneficial use are not being adversely affected and are not likely to be adversely affccted Therefore, it is appropriate to allow passive bioremediation to continue to reduce fuel hydrocarbon concentrations in the vadose zone at the site Conditional case closure is appropriate, under the conditions described in this section 12