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RESNA ESCALON TEL :209-838-3567 Aug 29 '95 8 :43 Na .062 A .03 <br /> - -11,firWM <br /> Working To Restore Nature <br /> through 9. Sample F (St'NW-5.5'-'W), which contained significant levels of petroleum <br /> hydrocarbons, was collected prior to removal of the product vent tines. The lines were removed <br /> -luring 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. The 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 cub constituent in the area beneath the facility is uniformly <br /> 5 feet in thickness (the worst case scenario), the volume of impacted soil in tach concentric <br /> isoconcentrattion zone shown on Figures a through 9 can be estimated using the volume formula <br /> for a half cylinder: <br /> V <br /> 2 <br /> Using the average constituent concentrations in each concentric zone., the n= of constituents <br /> remaining in the soil in each zone is calculated according to the formula: <br /> cancen tza ti on Eff x 3.; �. K yd', x L5 - -lbs contaminant <br /> kg 1o6mg . ydJ <br /> The mass of contaminants in each none is then summed to determine the til. The calculated <br /> mass and volumes of petroleum hydrocarbon constituents are summarized below: Calculation <br /> summaries are included in Appendix W. <br /> owotaaetzsu -aase, rt. 6 <br />