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' kT# KLEINf ELDER <br /> The extractable TPH and purgeable TPH concentrations detected in the twoideep samples <br /> beneath tanks T2 and T3 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 contanunation 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, Klemfelder 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 bonngs 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 contamination, 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 /> I <br /> 1 <br /> FR25-91-29 Page 2 of 11 <br /> Copyright 1991 Kleinfelder, Inc <br /> I <br />