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HYDROCARBON-IMPACTED SOIL <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> I 3 <br /> Volume of impacted soil left in place in the vicinity of the former UST.- <br /> An estimate of the areal extent of impacted soil surxounding'the eastern portion of the former UST <br /> area is made from samples collected from borings B-1, B-2,1113-3 and the excavation,of the UST. <br /> Based on the distance between the borings, a distance of 5 feet is utilized as an `average' radius of <br /> the hydrocarbon plume for the following calculation. The vertical distribution of the impacted soil <br /> appears to be between 5 and 10 feet in depth bsg. This volume was calculated from soil sample data <br /> and the volume of the replacement of soil in the UST excavation. <br /> z <br /> Vg= 7tr2 h -4 7L{5ft ) • b ft 470= ft3 17y d3 <br /> Converting 17 yd'to cm3 yields approximately 1.7 x 106 cm3.Using 1.5 g/cm3 as the weight of soil <br /> the total weight of contaminated soil is approximately 2.55 x 104 grams. <br /> Using 400 parts per million as the "average" concentration g of.total petroleum hydrocarbons <br /> Y <br /> quantified as gas from 4 feet bsg to 9 feet bsg, the mass is: <br /> weight of soil • average concentration -+ 2.55 x 1040.0004 <br /> g • g 10,200 g of diesel, <br /> Converting grams of diesel to volume of gas(gallons)using density. of 0.74: , <br /> 10,200 g of diesel;0.74g/cm3 = 7548 cm3 <br /> 3j <br /> 7548 cm3 • (1 gallon 3,785 cm3) = 1.9 gallons of gasoline <br /> ilL <br /> F <br /> i= <br /> Adm <br /> ced GeoEnvironmenW <br /> Inc. <br /> S <br /> E <br />