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KLEINFELDER <br /> 1 <br /> The extractable TPH and purgeable TPH concentrations detected in the two deep samples <br /> beneath tanks 12 and 13 indicate that petroleum hydrocarbons have impacted the soil to a <br /> vertical depth of 18 feet As the petroleum hydrocarbon concentrations were detected at <br /> the bottom of the borings, the vertical extent of contamination is not known Kleinfelder <br /> ' recommends drilling an additional boring to assess the vertical migration of the <br /> hydrocarbons. Additionally, if petroleum hydrocarbons are found to extend to ground <br /> ' water, Kleinfelder recommends sampling the ground water to assess for the possible impact <br /> by petroleum hydrocarbons Once the vertical extent of contamination has been evaluated, <br /> additional borings may be necessary to assess the lateral extent of contamination The <br /> need 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 contammation, depth to ground water and average annual rainfall <br /> The above conclusions and recommendations are subject to the limitations included in <br /> ' Section b of this report <br /> FR25-91-29 Page 2 of 11 <br /> ' Copyright 1991 Kleinfelder,Inc �;�i <br />