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Usingthis technique, treatment for the soil pile should be complete in q ' two to three weeks The treated soil can then be used or disposed off site Field testing to determine the degree of cleanup can use the same immuno-assay technique used for judging the limits of excavation If tests show that cleanup goals have not been met, further operation of the 1 thermal (HEVE/TO) system should be carried out If after another 5 days or so of thermal treatment, cleanup criteria still have not been met, the soil should be moistened using the same piping network The presence of nutrients will allow biological degradation to complete the process of hydrocarbon destruction in the already warm soil pile Air circulation should be continued but without heat The rate of biodegradation can be followed by monitoring CO2 concentrations in the extracted vapor When CO2 generation drops, the soil pile should be tested again ' On the basis of current analytical data, biological treatment and additional testing may not be necessary By using the heat enhanced volatilization, treatment time is reduced to an absolute minimum Providing the ' opportunity to complete the process biologically helps assures that cleanup goals can be met At the conclusion of the treatment cycle, post-remediation sampling will be conducted Uncomposited samples will be collected from from 6 representative sites from within the soil pile (1 site from within each ,'e approximate 50 cubic yard area of the pile) and test them for the following parameters (report as dry weight) ■ Total petroleum hydrocarbons - gasoline (by EPA Method 8015 Mad-G), ' ■ Total petroleum hydrocarbons - diesel (by EPA Method 8015 Mod-D), ' ■ Benzene, toluene, ethylbenzene, xylene (by EPA Method 8020), ■ Metals (cadmium, chromium, nickel, lead and zinc (by EPA ' Method 6010), and 0 Percent soil moisture 3-4 ' COMPANY CONFIDENTIAL TRADE SECRET AND PROPRIETARY INFORMATION OF THE MARK GROUP III r