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— HYDROCARBON-IMPACTED SOIL <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> Volume of impacted soil left in place in the vicinity of the former UST.- <br /> An <br /> ST: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 /> V9= nrz •h -+ n(Sftz) - I 1 ft 864.3= ft' 32 yd' <br /> Converting 32 yd' to cm3 yields approximate]y,3 lx 106 cm3. Using 1.5 g/cm3 as the weight of soil, <br /> the total weight of contaminated soil is approximately$ x I O6 grams. <br /> Using 1185 parts per million as the "average" concentration of total petroleum hydrocarbons <br /> quantified as diesel from 5 feet bsg to 16 feet bsg, the mass is: <br /> weight of soil - average concentration —>► 48 x 106 g - 0.001185 g = 56898 g of diesel <br /> Converting grams of diesel to volume of diesel (gallons) using density of 0.84: <br /> 56898 g of diesel _ 0.84g/cm3 = 67735 cm3 <br /> 67735 • (1 gallon_ 3,785 cm3) 17.8 gallons of diesel <br />