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02/81/2001 15:34 2044677.1 AGE STOCKTON PAGE 02 <br /> 4 <br /> HYDROCARBON-IMPACTED SOIL IESEL) <br /> h <br /> VOLUME ASSUMPTIONS AND CALCULATIONS ! <br /> PAIGE'S TOWING• <br /> 1807 Douglas Road, Stockton, CA <br /> Volume of impacted soil. <br /> m <br /> An estimate of the areal extent of impacted soil surrounding the former UST area is made from samples collected from <br /> borings DI through B8 and wells MW1 and MW4. <br /> Based on the distance between the impacted borings and wells,'a distance of 35 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 B8 between 15 feet to <br /> 20 feet bsg and in borings B7 and]33 between 15 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 /> Va=xr'•h -* 71(35ftz) 10 ft 38,484 fe/27 felyd3 1,425 yd' <br /> k <br /> l <br /> Converting 1,425 yd3 to crm3 1 <br /> 1,425 yd3•7.6455 x 105 ctn3/yd3r, 1.1 x 109 cm, <br /> yields approximately 1.1,x 109 cm3. Using 1.5 g/cm' as the weight of soil, the total weight of contaminated soil is <br /> approximately 1.6 x 109 gianos. <br /> Calculating an average concentration from soil samples collected from depths of 10 feet bsg to 25 feet bsg, a value of <br /> 3.5 milligrams per kilogra a as the"average"concentration of total petroleum hydrocarbons quantified as diesel.This <br /> value will be used for soils in the calculated area from 10 feet bsg to 25 feet bsg,the mass is: <br /> weight of soil•average concentration 41.6 x'109gratns + 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 <br /> .84_5,600 g of gasoline-0-84g/cm3= 6,667 cm3 <br /> 6,667 cin' •(1 gallon_3,785 cm3) � 1.76 gallons of diesel <br /> Note: Gasoline was only.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 GeoEnvironrmental,Inc. <br /> t7nWi <br /> Brian W.Millman <br /> Staff Geologist <br />