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Wal INC 2) Soil impacted by hydrocarbon compounds from fuel leakage at the concrete tank site is restricted to a distance of five feet from the sidewalls and floor of the tank These hydrocarbon concentrations to the soil are above action levels as outlined by the CRWQCB in the LUFT manual and some manner of mitigation will be required 3) Soil impacted by chlorinated hydrocarbons is present an the area immediately north of the concrete tank, Concentrations are at or above action levels as designated by the California Department of Health Services 4) Local ground water beneath the Lustre-Cal site as not likely impacted by hydrocarbon compounds The potential for local ground water contamination from chlorinated hydrocarbon compounds in the soil as unevaluated WZI recommends the following actions 1) Prepare a Health Rask Assessment for the hydrocarbon contaminated soil below the concrete tank to determine if the soil can be left an place This assessment would be provided to San Joaquin County for their review and approval 2) Prepare a remedial action plan for hydrocarbon contaminated soil that will describe the effort to excavate hydrocarbon contaminated soil where practical This remedial action plan should include a plan to be submitted to San Joaquin County for approval for the formal abandonment of the concrete tank The tank should be emptied of all fluid and the anterior should be cleaned All piping related to the tank should be removed where practical and of not feasible, all remaining piping should be cleaned and backf lJed by grout as appropriate The tank should be filled with inert material (sand) or other material as appropriate according to San Joaquin County regulations An impermeable cap of asphalt or cement should be placed over the former tank location to prevent downward migrating surface runoff water from entering the 12-270010 01 3 Page 4