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f <br /> PROPOSAL FOR CLEANUP OF <br /> CONTAMINATED SOILS <br /> The most economic method to clean up the contaminated soils is to utilize the <br /> third discharge point, at the underground storage tank backfill area, as des- <br /> cribed in response to your itei (4) . The soil-bound hydrocarbons shall be <br /> freed during the regulated discharging of the cleaned wate=r and migrate to <br /> the ground water table where the adsorbed hydrocarbons wilA transport to the <br /> recovery well. The clean water should follow a simular migration pattern as <br /> did the leaking fuel, until the cone of depression is encountered. <br /> The cost for implementing the above method of soil decontamination shall be <br /> a part of the normal cost of operation of the ground water depression/ <br /> restoration system. The construction cost is estimated :to be less than <br /> $lo,oao. <br /> A proposal to explore the use of acceleratee biodegradatiam. can be presented <br /> if it is determined that the adsorbed and d salved hydrocarbon. concentrations <br /> have not been reduced to an acceptable level . A proposal to employ accelerated <br /> biodegradation at a simular location was estimated to cost between $144,000. <br /> ar=u $220,000. annually, allowing for an extc=nded cleanup -.period. <br /> :F <br /> y <br /> . r9. <br />