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HYDROCARBON-IMPACTED SOIL <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> Volume of impacted soil left in place in the vicinity of rhe former DIST.• <br /> An estimate of the areal extent of impacted soil surrounding the eastern portion of the former UST <br /> area is made from samples collected from borings SP-1, SP-2, SP-3 and the excavation of the UST. <br /> Based on the distance between the borings, a distance of 5 feet is utilized as an `average' radius of <br /> the hydrocarbon plume for the following calculation. The vertical distribution of the impacted soil <br /> appears to be between 5 and 16 feet in depth bsg. This volume was calculated from soil sample data <br /> and the volume of the replacement of soil in the UST excavation. <br /> Vs = 7tr" •h 4 rt(5ft') • 11 ft = 864.3 ft' •27 ft'/yd' � 32 yd' <br /> Converting 32 yd' to cm3 <br /> 32 yd3 • 7.6455 x 105 cm'/yd3 z 2.4 x 10' cm3 <br /> yields approximately 2.4 x 10' cm3. Using 1.5 g/cm3 as the weight of soil, the total weight of <br /> contaminated soil is approximately 3.6 x 10'grams. <br /> Calculating an average concentration from the following soil samples collected from a depth of 7 <br /> to 16 feet bsg: NW-1, T-1, SP 1,2,3, SPI-13, SP1-16, SP2-7, SP2-10 and SP2-14, a value of 1734 <br /> milligrams per kilogram as the "average" concentration of total petroleum hydrocarbons quantified <br /> as diesel. This value will be used for soils in the calculated area from 5 feet bsg to 16 feet bsg, the <br /> mass is: <br /> weight of soil • average concentration -+ 3.6 x 10'granas • 0.001734 g of diesel <br /> = 63,635 g of diesel <br /> Converting grams of diesel to volume of diesel (gallons) using density of 0.84: <br /> 63,635 g of diesel - 0.84g/cm3 = 75,755 cm3 <br /> 75,755 cm3 • (I gallon- 3,785 cm3) = 20 gallons of diesel <br /> Advanced GeoEnvironmental,Inc. <br />