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li I <br /> d <br /> HYDROCARBON-IMPACTED SOIL <br /> VOLUME ASSUMPTIONS AND CALCULATIONS 3 <br /> An estimate of the areal extent ofimpacted soil surrounding the former UST area is made from <br /> samples collected from boring B2,B3, B4 and wells MWl and MW4. <br /> i <br /> Based on the lateral distribution of sampling points found to contain detectible concentrations of <br /> petroleum hydrocarbons, AGE assumes the hydrocarbon-impacted soil plume to be approximately i <br /> 5>100 square feet. The vertical distribution of impacted soil appears to be between 5 feet and 12 feet <br /> bsg with the most impacted soil occurring between 3 feet and 8 feet bsg. <br /> Impacted Soil Between 3 feet and 8 feet bsg: <br /> Volume of impacted soil: 5,100't2 x 5 ft=25,500 ft3 - 27 ft3/yd3=944 yd3 or 7.22 x 108 cm3 <br /> Mass of impacted soil: 7.22 x: 108 cm3 • 0.00 15 kg/cm3 = 1,083,119 kg <br /> Average concentration: 1,600''mg/kg <br /> Density of TPH-g: 0.75 gent <br /> Mass of TPH-g in soil: 1,083;119 kg x 1,600 mg/kg = 1.73 x 109 mg= 1.73 x 106 g <br /> 3 Volume of TPH-g in soil: 1.73 x 106 g - 0.75 g/cm3 =2.31 x 106 cm3 • (1 gallon-3,785 cm3) <br /> 610 gallons of gasoline <br />� I •i <br /> TPH-d: . <br /> Volume of impacted soil: 5,100 ft <br /> Z x 5 ft=25,500 ft3 _ 27 ft3/yd3=944 yd3 or 7.22 x 108 cm3 <br /> Mass of impacted soil: 7.22 x 108 cm3 • 0.0015 kg/cm3 = 1,083,119 kg <br /> Average concentration: 360 mg/kg <br /> Density of TPH{ : 0.84 g/cm3 'I <br /> Mass of TPH�in soil: 1,083;119 kg x 360 mg/kg = 3.90 x 108 mg = 3.90 x 105 g <br /> 3 . 4 „ � <br /> Volume of TPH�in soil:. _ _3.90 x-1 05 g -,0.84 g/cm. —4.6-�.x.i05 .,m3 • l•1 gallon_ 3,785 cm) ,r <br /> 123.gallons of diesel <br /> I li <br /> a <br /> i <br />