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B moistening the already warm soil pile, the growth of naturally • Y g Y occurring microorganism will be stimulated As biological oxidation of hydrocarbons increases, the composition of the aur extracted from the pile will change, showing increasing carbon dioxide and possibly reduction in oxygen content This gas composition will be monitored every one to three days until the analysis returns to nearly the same as ambient air At that point, samples of the treated soil will be taken for hydrocarbon analysis When 90 % of the samples show less than 10 mg/kg and all samples are less than 100 mglkg, treatment will be discontinued At this point, assuming that no other hazardous chemicals such as heavy metals are present,the soil should be suitable for use as landfill cover or backfill either on- or off-site. Approximate costs for hybrid thermal/bioremediation are as follows: Soil Volume, cubic yards 250 500 750 Item Sampling and Analysis $3,000 $3,500 $4,000 Treatment Area Construction 4,500 6,000 8,000 Treatment Unit Rental 5,000 6,000 7,000 Fuel & Operating Cost 5,000 7,000 9,000 Final Disposal 21000 3,000 4,000 Total 19,500 25,500 32,000 $/cubic yard 78 51 43 2 3 4 Comparison of Alternatives The following table compares the three alternatives discussed above, using an anticipated 500 cubic yards of soil to be treated as a basis A plus one ' indicates that the alternative completely meets the criteria A minus one indicates that the alternative fails to meet the criteria or there is serious uncertainty A zero score indicates the alternative is likely to meet the criteria with additional study of that a negative impact is acceptable Costs used in this comparison exclude program management, permitting, and report preparation 2-8 COMPANY CONFIDENTIAL TRADE SECRET AND PROPRIETARY INFORMATION OF THE MARK GROUP INC III P