Laserfiche WebLink
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, FID 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 each constituent to 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 -- rrrzh <br /> 2 <br /> 1 <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 /> concentration(kg � <br /> ) x Okg X yd3 21001b t 1b5 contain.2nant <br /> 06mg y 3 <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 r - <br /> y <br /> OW014MR£PORTSWIZ-4694 FNL 6 <br />