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3 <br /> -jZZ-0� <br /> Working To Restore Nature <br /> through 9. Sample F (SP-NW-5.5'-W), which contained significant levels of petroleum <br /> hydrocarbons, was collected prior to removal of the product vent lines. The lines were removed <br /> during the excavation and an additional two feet from the north wall was excavated, effectively <br /> removing a significant portion of contaminated soil in the vicinity of Sample`F. No soil <br /> contamination was apparent below the layer of fat clay (approximately 10 feet) based upon field <br /> observations, PID readings, and analytical results. IThe zone of vertical impaction appears to <br /> exist primarily between depths of approximately three to eight feet below grade. <br /> Assuming that the impacted area for each constituent in the area beneath the facility is uniformly <br /> 5 feet in thickness (the worst case scenario), the volume of impacted soil in each concentric <br /> isoconcentration zone shown on Figures 4 through 9 can be estimated using the volume formula <br /> for a half cylinder: <br /> V = 7r?h <br /> 2 <br /> Using the average constituent concentrations in each concentric zone, the mass of constituents <br /> remaining in the soil in each zone is calculated according to the formula: <br /> concenti On( g) x lkg X yd3 x 2500Zb= lbs contaminant j <br /> :- kg <br /> _06 mg : 1yd3 <br /> . . <br /> The mass of contaminants in each zone is then summed to determine the total. The calculated <br /> mass and volumes of petroleum hydrocarbon constituents are summarized below. Calculation . <br /> summaries are included in Appendix IV. <br /> i <br /> O W01481REPORTS\CR-W94.FW L <br />