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~02/05/2001 14:52 2094673 AGE STOCKTON i PAGE 02 <br /> HYDROCARBON-IMPACTED SOIL(DIESEL) <br /> VOLUME ASSUMPTIONS AND CALCULATIONS <br /> PAJGE'S TOWING <br /> 1807 Douglas Road, Stockton, CA <br /> i <br /> Volume of impacted soil <br /> An estimate of the areal extent of impacted soil surrounding the foin T UST area is made from samples collected from <br /> borings B1 through B8 and wells MW1 and MW4. <br /> Based on the distance between the impacted borings and wells,a distance ofQ5 :Feet is utilized as an`average' radius <br /> of the hydrocarbon plume for the following calculation. The vertical distribution of the impacted soil varies.In boring <br /> B 1 impacted soil appears to be between 10 feet and 25 feet below surface grade(bsg),in boring 08 between 15 fact to <br /> 20 feet bsg and in borings B7 and 133 between 1 feet to 25 feet bsg.An average of 10 feet in height will be used for <br /> the following calculations, This volume was calculated from soil.sample data. <br /> V8=rvrz•h - rt(35ft2)% 10 ft 38,484 ft'/27 f0/yd3 = 1,425 yd' <br /> Converting 1,425 yd'to cm3 <br /> 1,425 yd3•7.6455 x 1.05 caxa3/yd3= 1-1 x 109 C& <br /> yields approximately 1.1 x 109 cin'. Using 1.5 g/cm3 as the weight of soil, the total weight of contaminated soil is <br /> approximately 1.6 x 10'grams. <br /> ~ Calculating an average gerttratio�a f�ow soil sarakples collected from depthsof1eet bsg to 25 feet bsg a value of <br /> 3.5 milli ams perlothe"averacoacentratoftotaletxOlt h drocarbons quantified as diesel. Thisvaluewill be use for sin the calculated area from 10 feet bsg to 25 feet bsg,the mass ts; <br /> weight of soil•average concentration -0-1.6 x Wgraxns •0.0000035 g of gasoline <br /> =5,600 g of gasoline <br /> Converting grams of diesel to volume of diesel(gallons)using density of 0.84; <br /> 5,600 g of gasoline-0.84g/trn7 = 6,667 cm' <br /> 6,667 cm' •(1 gallon 3,785 cm') G 1.76 gallons of diesel <br /> Note: Gasoline was c aly.,,detected in one soil sample at the site in boring B1,at 25,feet bsg,therefore a mass balance <br /> could not be calculated for gasoline. <br /> Sincerely, <br /> Advanced GeoEnvironmentai,Inc. <br /> E7n <br /> d�f <br /> Brian W.Millman <br /> Staff Geologist <br /> 1 <br /> i <br />