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` Site Characterization and So.. .emediation Plan. 7300 West Eleventh Street, Tracy, _,9. Page 22 <br /> o Thoroughly rototill the soil spread, replace the irrigation <br /> system, and set it in operation. <br /> ❑ When visual and olfactory indicators are such that all <br /> remnants of hydrocarbon fuels appear to have been removed <br /> from the bioremediated soil, sample the soil for TPH(d) and <br /> BTEX according to the protocol described in Sampling of <br /> Treated Soil, below. <br /> i <br /> i <br /> ❑ Evaluate the results from of the analyses performed in the <br /> preceding element to determine if traces of components of <br /> i' hydrocarbon fuels in the soil are less than the established <br /> cleanup standards in the remediation plan. If they are, <br /> bioremediation is complete. If not, work elements should be <br /> � repeated until the cleanup criteria are met. <br /> Sampling of Treated Soil <br /> When the aeration or bioremediation process has essentially eliminated <br /> olfactory indicators of components of fuel hydrocarbons from the spread soil, <br /> i the treated soil will be tested to check for any residual concentrations of <br /> analytes of concern. The sampling and analysis procedures used for this phase <br /> of testing are described below. <br /> Estimated Number of Samples Required from Spread of Aerated Soil. <br /> The number of samples required to demonstrate that the aerated soil has been <br /> cleaned of components of fuel hydrocarbons, including diesel, can be estimated <br /> from the available data obtained from soil samples recovered from Stockpile <br /> No. 2. <br /> Table 3 presents the results of soil analyses of samples initially recovered from <br /> i Stockpile No. 2. The results for diesel have the following statistical properties: <br /> Number of Samples: 8 <br /> Degrees of Freedom: 7 <br /> Mean Concentration of Diesel 6 14.13 mg/Kg <br /> Standard Deviation 618.70 mg/Kg <br /> Coefficient of Variance 1.01 <br /> Experience has shown that, after treating hydrocarbon-affected soil by aeration <br /> and bioremediation so that the concentrations of analytes of concern are close <br /> to the desired cleanup standards, the mean concentration of the analytes <br /> remaining in the treated soil are approximately one-half the established cleanup <br /> level- Experience also shows that the variability of trace concentrations of fuel <br /> sic <br /> .i <br />