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Calculation for the Estnveated Volume of TPHg Contamination in Soil Volume of an ellipsoid =V= 4/3 Tt('/s h)(1/2w) ('h 1),where w = I Average soil density in the contaminated zone =2 0 g/cm2' 2 0 g/cm'X 1lb/453 6g X 28,316.8 em'/1 ft' = 124 9 lbs/1 ft' Soo Figure 2a for cross section of TPHg concentration gradient contours Note that six(6)sets of closed concentration gradient contours show the distribution of TPH9 in the shape of an ellipse Each ollipso represents an a shell of an ellipsoidal volume. Volume calculation for each ellipsoidal shells Average soil concentration Shell A 419x4ftx4ftx2ft= 134 ft' 2,100 ppm Shell 8 4.19 x 10 0.1011.2 ft = 838 ft' 2,150 ppm Shell C (4.19 x 20 ft x 20 ft x 5 ft)-838 ft' = 7,542 ft' 550 ppm Shell D (4.19 x 25 ft x 25 ft x 8 ft)-7,542 ft' = 13,408 ft' 75 ppm Shell E (4 19 x 37 ft x 37 ft x 15 ft)-(13,408 ft'- 134 ft') = 72,510 ft' 30 ppm Shell F (419x39ftx39ftx16ft)-(4.19x37ftx37ftu15ft) = 15,926ft' 5ppm Estimated sum of mass of TPHq in sod 134 ft' x 2,100 ppm x 124 9 lbs/ft'x 10" = 35 lbs 638 fl' x 2,150 ppm x 124 9 lbs/ft'x 10-6 =225 lbs 7,542 ft' x 550 ppm x 124 9 lbs/ft'x 10° = 518 lbs 13 408 ft'x 75 ppm x 124 9 Ibs/ft'x 10 6 = 126 lbs 72,510 ft'x 30 ppm x 124 9 lbs/ft'x 10' =272 lbs 15,926 ft'x 5 ppm x 124.9 Ibs/ft'x 101 = 10 lbs E,9 OG Dn G4 7PNO In 0a10 Calculation for the Estimated Volume of Benzene Contamination in Sod Volume of an ellipsoid =V=4/3 TF('/s h)(1/2w) ('/2 t),where w= Average sod density in the contaminated zone T 2 0 9/cm' 2.0 g/cm'X 1 ib/453 6g X 28,316.8 cm'/1 ft'= 124 9 lbs/1 ft' See Figure 2b for cross section of benzene concentration gradient contours. Note that five(5)sets of closed concentration gradient contours show the distribution of TPHg in the shape of an ellipse Each ellipse represents an a shell of an ellipsoidal volume Volume calculation for each ellipsoidal shells Average soil_concentration Shell 1 419 x 8 ft x 8 ft x 2 5 ft = 670 ft' 21 ppm Shell 11 419x11 ftx11 ftx2.5ft= 1,267 fl' 11.5 ppm Shell III (4 19 x 17 ft x 17 ft x 5 ft)- 1,267 ft'= 4,788 ft' 75ppm Shell IV (4.19 x 33 ft x 33 ft x 13 ft)-(670 ft'+4,788 ft') = 53,860 ft' 3 0 ppm Shell V (4.19 x 41 ft x 41 ft x 23 ft)-53,860 ft' = 108,138 ft' 0 5 ppm Estimated sum of mass of benzene In soil 670 ft' x 2 1 ppm x 124 9 Ibs/ft'x 101 = 0.18 lbs 1,267 ft' x 11.5 ppm x 124 9 Ibs/ft'x 100 1 82 Ibs 4,788 ft' x 7 5 ppm x 124 9 Ibs/ft'x 10"6 = 4.49 Ibs • 53,860 ft' x 3 0 ppm x 124 9 lbs/ft'x 10-6 = 20 18 lbs 108,138 ft'x 0.5 ppm x 124.9 Ibs/ft'x 1O-6 = 6 75 lbs 33.4 llba o9 0noaanono In coil