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i <br /> HYDROCARBON (GASOLINE)-EYIPACTED SOIL <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> Grant Line Gas & Food <br /> 2420 Grant Line Road, Tracy, California <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 boring B3, B5, B7 and B9 and wells MWl and MW8 <br /> Based on the distance between the borings and wells, a distance of 80 feet is utilized as an `average' <br />' radius of the hydrocarbon plume for the following calculation The vertical distribution of the <br /> impacted soil appears to be between 5 and 10 feet in depth bsg This volume was calculated from <br />' soil sample data <br /> Vg= rcrZ •h -4 Tc(80ft) • 5 ft =100,530 ft' /27 ft3/yd3 = 3,723 yd3 <br /> Converting 3,723 yd to cm3 <br /> 3,723 yd3 • 7 6455 x 105 CM3/y&= 28 5 x 108 cm3 <br />' yields approximately 28 5 x 108 cm3 Using 1 5 g/cm3 as the weight of soil, the total weight of <br /> contaminated soil is approximately 42 75 x 108 grams <br />' • Calculating an average concentration from soil samples collected from a depth of 5 feet bsg to 10 <br /> feet bsg, a value of 4 0 milligrams per kilogram as the "average" concentration of total petroleum <br />' hydrocarbons quantified as gasoline Tlus value will be used for soils in the calculated area from 5 <br /> feet bsg to 10 feet bsg, the mass is <br />' weight of soil • average concentration X42 75 x 10g grams • 0 000004 g of gasoline <br /> = 17,100 g of gasoline <br />' Converting grams of gasoline to volume of gasoline (gallons) using density of 0 75 <br />' 17,100 g of gasoline —0 75g/cm3 = 22,800 cm3 <br /> 22,800 cm3 • (1 gallon— 3,785 cm) = 6 gallons of gasoline <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />