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Appendix C - Volume-Mass Calculations AGE Project No. 99-0682 Page 2 of 4 1 ) For the estimated inner zone (> 1 , 000 mg/kg contour area): Area = 214 ft' and h = 15 ft V7000 = 214ft' • 15ft = 3 ,210ft' V,1,000 • typical weight of soil • average concentration of contaminant -� 3,210 ft3 • 100 lbs/ft3 • 0 . 003228 �+ 1 ,036 lbs of TPH-g 2) For the estimated middle zone ( 100- 1 ,000 mq/kq contour area) : Area = 503 ft2 and h = 15 ft V100 = 503 ft2 • 15 ft - V, ,000 V100 = 41335 ft3 V100 • typical weight of soil • average concentration of contaminant -i 4 ,335 ft3 • 100 lbs/ft3 • 0. 00055 4 238 lbs of TPH-g 3 ) For the estimated outer zone (1 - 100 mq/kq contour area ) : Area = 1 ,038 ft2 and h = 15 ft V, = 1 ,038 ft' e 15 ft - V100V1 ,000 V1 = 8,025 ft3 V, • typical weight of soil • average concentration of contaminant -> 82025 ft3 • 100 lbs/ft3 . 0 , 000028 -i 22 lbs of TPH-g All together, the weight of TPH-g equals : 1 , 036 lbs + 238 lbs + 22 lbs -a 1 ,296 lbs of TPH -g Converting pounds of TPH -g to volume (gallons) using density of TPH-g equal to 6 . 25 lbs/gal : 1 ,296 lbs + 6 . 25 lbs/gal -a 207 gallons of TPH -g 25 to 60 foot zone: • >1 ,000 mg/kg (inner zone) : The 133-35 ( 1 ,200 mg/kg ) , MW 18-30 (3 ,900 mg/kg ), MW 1 B-40 (5,200 mg/kg ) , MW - 18-50 (6 , 100 mg/kg ), B1 -35 ( 12, 000 mg/kg ), B1 -45 (3 ,900), VW1 -25 (27700 mg/kg ), VW 1 -30 (5,900 ) and the 1 ,000 mg/kg contour line; average = 4 ,655 mg/kg (equivalent to 0 .004655) . • 100-1 ,000 mg/kg (middle zone) : The sum of the 1 ,000 mg/kg contour line and the 100 mg/kg contour line ; average = 550 mg/kg (equivalent to 0.000550) . • 1 - 100 mg/kg (outer zone) : The sum of 132-25 (5 . 1 mg/kg ), B2-35 (5 .6 mg/kg ), MW7-60 (6 .5 mg/kg ) , the 1 mg /kg and the 100 mg/kg contourlines average = 23 mg/kg (equivalentto 0 .000023) . Advanced GeoEnvironmentah Inc.