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HYDROCARBON-IMPACTED SOIL <br /> MASS and VOLUME ASSUMPTIONS AND CALCULATIONS <br /> Volume of impacled soil left inplace in the vicinity of the former UST.- <br /> An estimate of the area] extent of impacted soil under the former waste oil UST area is made from <br /> samples collected frons borings B-1, B-2, B-3 and B-4. <br /> Based on the distance between the borings (ten.feet), a distance of 5 feet is utilized as an `average' <br /> E� radius of the hydrocarbon plume for the following calculation. The vertical distribution of the <br /> impacted soil appears to be between 5 and 15 feet in depth bsg. This volume was calculated from <br /> soil sample data. <br /> 1. V,= 7c? •h Tc(5fr') • 10 ft ^ 785 ft' •27 ft'/yd' = 29 yd' <br /> 2. Convei ting'29 yd to kilograms 1,225 Kg/yd3 = 35,525 Kg soil <br /> Calculating an average concentration from the following soil samples collected from a depth of 5 <br /> to 20 feet bsg: B1=5, B1-10 and B1-20, 132-5/10, B3-5110 and B4-5/10, an average value of 990 <br /> milligrams per1ilogram as the "average" concentration of total petroleum hydrocarbons quantified <br /> as diesel and motor:oil combined. This value will be used for soils in the calculated area from 5 feet <br /> bsg to 15 feet bsg,the mass is: <br /> 3. Mass of so]] • average concentration 35,525 kg soil • 0.00099 g of diesel/motor oil <br /> Yields: 35.2 Kg of diesel/motor oil <br /> 4. Converting.Kg of diesel/motor oil to volume of diesel (gallons) using density of 0.85: <br /> 35,169 Ka' of diesel/motor oil — 0.85g/cm' = 41,375 cm3 <br /> 41,375'cm3 • {1 gallon - 3,785 cm ) = 10.9 gallons of diesel and motor oil <br /> 1 <br /> h <br />