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jPER <br /> KLEINFELDER <br /> Factors limiting the excavation of contaminated soil w' <br /> `_. a.11 be ground water, <br /> surface obstructions, and property boundaries. Except for the area of new <br /> tank ins::allation, soil will not be excavated below free water encountered <br /> in the excavation. <br /> Based on the criteria limiting the excavation, Kleinfelder anticipates the <br /> successful removal of petroleum hydrocarbon contamination in the <br /> unsaturated soil. The excavation will be continued- laterally until <br /> M petroleum hydrocarbons do not appear to be present, or surface <br /> fi obstructions or property boundaries are encountered. The <br /> TPH remaining in <br /> the soil can only be assessed after the confirmation soil sample results <br /> i� <br /> are received. <br /> ti <br /> ' if$ hydrocarbons remain in <br /> significant concentrations, then alternative <br /> remediation alternatives can be investigated. Remediation alternatives <br /> mould :include vapor extraction or bioremediation. The soil consists of <br /> silts and clays, therefore, these remediation alternatives may have . <br /> 9 <br /> limited success. Four ground water monitoring wells are in place around <br /> the excavation. Petroleum hydrocarbons have not <br /> been detected in water <br /> samples analyzed from MW-3.,. MW-2 and MW-3, and low concentrations were <br /> detected in the sample analyzed from Mw-k. If low concentrations <br /> of <br /> ' petroleum hydrocarbons remain in the soil at the completion of the soil <br /> removal, the four wells will provide the capability for additional long <br /> } term monitoring. <br /> s <br /> .Removal of additional soil will enlarge the current excavation. The site <br /> „ is small, and in a high traffic and use area. <br /> It will be difficult to. <br /> f{[ <br /> L��99 secure a larger. excavation for any period of time. The potential for <br /> petroleum hydrocarbons remaining in the soil will <br /> ' be assessed from results <br /> 4 of confirmation samples. Currently there is a danger and liability <br /> y 5 <br /> associated with the .open. excavation. Upon completion of the removal <br /> action there .is no technical advantage to leaving the excavation open. <br /> Therefore, Kleinfelder recommends that The Customer Company be allowed'ta <br /> s'�` - - <br /> install the new underground storage tanks. <br /> �I <br /> uy-0 <br /> 47.-88-503. 5 <br /> low <br />