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KL11NrrLDER <br /> Based on the TPH concentrations detected beneath the west ends of tanks T2 and T3, <br /> petroleum hydrocarbons have impacted the soil beneath the tanks to a vertical depth of <br /> 18 feet The vertical extent of contamination has not been evaluated <br /> Kieinfelder recommends drilling at least one additional boring at the T2/T3 site to assess <br /> the vertical migration of the petroleum hydrocarbons and potentially the depth to ground <br /> water If ground water is encountered in the additional boring Kleinfelder recommends <br /> collecting a ground water sample to assess for the potential that petroleum hydrocarbons <br /> have impacted the ground water Once the vertical extent of contamination has been <br /> evaluated, additional borings may be necessary to assess the lateral extent of <br /> contamination <br /> Theetroleum hydrocarbon concentrations detected may require remediation The need <br /> P <br /> to remediate the soil can be evaluated based on the State of California, Leaking <br /> Underground Fuel Tank (LUFT) Field Manual Guidelines for maximum allowable TPH <br /> concentrations The need for soil remediation will be evaluated based on TPH <br /> concentrations, depth of contamination, depth to ground water and average annual rainfall <br /> San Joaquin General Hospital may wish to construct a soil venting well in one or more of <br /> the additional exploratory borings The soil venting wells would be used for possible vapor <br /> recovery if deemed necessary in the future <br /> FR25-91-29 Page 10 of 11 <br /> Copyright 1991 Klelnfelder,Inc <br />