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' HYDROCARBON-IMPACTED SOIL (GASOLINE) <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> STRONG PROPERTY <br /> 5157 West Business Loop 205, Tracy, CA <br /> Volume of impacted soil: <br /> An estimate of the areal 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 /> 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 />' A = <br /> A, (long radius, a)(short radius, b)(.7554) <br />' = 90(155)(.7854) = 10,956 ft' <br />' Ve= Ae •h —> 10,956 ft2 - 7 ft 67,692 ft' /27 ft3/yd3 2,840 yd' <br /> Converting 2,029 yd' to cm3 <br />'. 2,840 yd • 7.6455 x 105 cm'/yd' 2.17 x 109 cm' <br /> yields approximately 1.55 x 109 cm3. Using 1.5 g/cm3 as the weight of soil, the total weight of <br /> contaminated soil is approximately 3.2 x 109 grams. <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 of total 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 ofg asoline <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) using density of 0.75: <br /> 651,396 g of gasoline 0.758/cm3 = 868,529 cm3 <br /> 868,529 cm3 • (1 gallon - 3,785 cm) 229 gallons of gasoline <br /> i <br /> I <br />