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i IAdsorbed Gasoline Mass-Volume Calculations PACIFIC PRIDE - WEST LANE 3230 North West Lane, Stockton CA Assumptions • Utilizing Figures 5,8 and 11,the mass distribution of gasoline concentrations on the site can be approximated utilizing the equation for a half-coned shape The volume for a half-coned shape can be calculated by the formula V".o =(113 rt r2 h)/2, where `r' is the radius of the cone, `h' is the height of the cone For the estimated cone shape of area no 1 r N 4 ft and h = 7 ft For the estimated cone shape of area no 2 r = 6 ft and h = 20 ft For the estimated cone shape of area no 3 r= 5 ft and h = 11 ft The average TPH-g concentration was utilized for TPH-g impacted areas 1, 2 and 3, the average was calculated by summing the detected TPH-g concentrations for each gasoline-impacted area and dividing by the total number of I detections The average TPH-g concentration for gasoline-impacted area no 1 was calculated to be 20 milligrams per kilogram(rng/kg),31 mg/kg for gasoline-impacted area no 2 and 4 2 mg/kg for area no 3 GASOLINE-IMPACTED AREA NO 1) Approximate volume of gasoline-impacted soil(VGAI VO 1) VGAs NO I =(1 047)(4 ftf(7 ft)/2 —�58 6 ft (1 yd3/27ft') ;= 2 2 yd' IConverting 2 2 yd'to crn'(i e lyd3=764,555em3)yields approximately 1, 682,021 cm' Using 1 9 g/cm3 as the weight of soil,the total weight of contarnmated soil is approximately 3,195,840 g IUsing 20 mg/kg as the"average"concentration in the area of TPH-g impacted soil,the mass can be calculated to be weight of soil •average concentration -4 3,195,840 g • 0 000020=63 9 g of gasoline IConverting grams of gasoline to volume of gasoline(gallons)using density of gasoline equal to 0 75 (estimate) 63 9 g of gasoline—0 75 g/cm3=85 2 cm3 85 2 cm3 •(1 gallon—3,785 cm3) = 0 02 gallons of gasoline Converting gallons of gasoline to pounds of gasoline yields 0 02 gallons of gas—0 16 gal(estimate)of gas/lbs of gas = 0 14 pound of gasoline I I Advanced GeoEnvironmental,Inc. f I