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tj gid, <br /> HYDROCARBON-IMPACTED SOIL (GASOLINE) <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> STRONG PROPERTY '} <br /> 5157 West Business Loop 205, Tracy, CA <br /> Volume of impacted sail: <br /> An estimate of the area] extent of impacted soil surrounding the former UST area is made from <br /> samples collected from borings B1 through B7 and wells MW-1 and MW-12. <br /> aF <br /> The distribution of adsorbed hydrocarbon concentrations on the site'can be approximated by an <br /> ellipse with a long radius of 155 feet and a short radius of 90 feet. The vertical distribution of the <br /> impacted soil appears to be between 10 feet and 17 feet below surface grade(bsg).This volume was <br /> calculated from soil sample data. " <br /> Ae (long radius, a)(short radius, b){ ) <br /> 90(155)(.7854)= 10,956 ft' <br /> Vg= Ae •h -4 10,956 ft' • 7 ft 67,692 ft' /27 ft3/yd3 2,840 yd3 <br /> t <br /> Converting 2,029 yd' to cm3 <br /> 2,840 yd • 7.6455 x 105 CM3/yd' 2.17 x 109 cm3 <br /> r <br /> yields approximately 1.55 x 109 craw. Using 1.5 g/cm3 as the weighf of soil, the total weight of <br /> contaminated soil is approximately 3.2 x 109 grams. <br /> a <br /> Calculating an average concentration from soil samples collected from depths of.10 feet bsg to <br /> 17 feet bsg,a value of 200 milligrams per kilogram as the"average"concentration oftotal petroleum <br />` hydrocarbons quantified as gasoline.This value will be used for soils in the calculated area from 10 <br /> feet bsg to 17 feet bsg, the mass is: <br /> weight of soil • average concentration -43.2 x 109 grams • 0.000200 g of gasoline <br /> = 651,396 g of gasoline or 651 kg or 1,432 lbs of gasoline <br /> Converting grams of gasoline to volume of gasoline(gallons)sing density of 0.75: <br /> 651,396 g of gasoline- 0.75g/cm3 = 868,529 CM3 <br /> 868,529 cm3 • (1 gallon 3,785 cm3) 229 gallons of gasoline <br /> i} <br />