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1 <br /> Canepa's Car Wash <br /> September 23, 1996 <br />' Page-4- <br /> 4 0 MASS VOLUMHIN <br /> E OF YDROCARBON THE SOIL <br />' The mass of hydrocarbon in the soil and the volume of soil in the treatment area were estimated based <br /> on the existing subsurface exploratory data obtained by WHF Figures 3 through 8, Appendix A, illustrate <br /> estimated soil plume contours of 10 mg/kg, 100 mg/kg, and 1000 mg/kg <br /> The mass volume of hydrocarbons present in the soil beneath the site front 0 feet to 55 feet was estimated <br /> by Condor using software titled "HyperVentilate version 2 0", written by Shell Oil Company in <br />' cooperation with the United States Environmental Protection Agency(USEPA) The average soil TPH-G <br /> concentrations quantified in mg/kg were applied to a range of soil volumes to estimate the mass balance <br /> The soil volumes were estimated based on the approximate thickness and radius of a contaminated soil <br />' column Based on the soil analytical data available for the site, the volume of hydrocarbons present in <br /> the soil beneath the site is estimated at approximately 13,000 pounds or 2,050-gallons (6 34 lbs/gal) Due <br /> to unknown variations in the Iithology and contaminant concentrations, the actual volume of hydrocarbon <br />' beneath the site may vary by an order of magnitude or more from the estimate The Hyperventilate <br /> program spreadsheets used to estimate the mass balance are contained in Appendix C <br />' Soil volume calculations were made based on the following volume equation for a simple cylinder <br /> VS = Irr-'h <br /> where V, W volume of soil <br /> r = radius of soil zone containing >10 mg/kg TPH-G <br /> h = height of soil zone <br /> Using the above equation for each of Figures 3 through 8, "r"and "h" are estimated based on each contour <br /> and the approximated thickness of each contaminated zone Combining the subtotals for each soil layer <br /> yields a total soil volume of approximately 18 000 cubic yards within the contaminated zone from 0' to <br /> 55' bgs at TPH-G concentrations of>10 mg/kg This estimation is based on limited soil analytical data <br /> and is only presented for general qualitative purposes The actual volume of soil impacted by>I 0 mg/kg <br /> TPH-G may differ by an order of magnitude or more <br /> 5 0 S VE BLOWER <br /> The blower type, maximum flow rate, and vacuum rating are presented below <br />■ T ype blower = Rotron DR505tcu, regenerative <br /> Max flow rate = 160 scfm @ 3,500 rpm <br /> IVacuum rating = 77 inches HZO @ 3,500 rpm <br /> It� CONDOR <br />