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1 Appendix C - Volume-Mass Calculations AGE Project No. 99-0682 Page 3 of 4 1 ) For the estimated inner zone (> 1 , 000 mq/kq contour area ) : Area = 691 ft2 and h = 35 ft V1 ,000 = 691 ft2 • 35 ft = 24 , 185 ft' V>1 ,000 • typical weight of soil • average concentration of contaminant -� 24 , 185 ft3 • 100 lbs/ft3 • 0 . 004655 -4 11 ,258 lbs of TPH -g 2) For the estimated middle zone ( 100- 1 , 000 mq/kq contour area ) : Area = 1 , 067 ft2and h = 35 ft V100 = 1 ,067 ft' . 35 ft - V11000 V100 = 132160 ft3 V100 • typical weight of soil • average concentration of contaminant =4 13 , 160 ft' • 100 lbs/ft3 • 0 . 00055 -a 723 lbs of TPH -g 3) For the estimated outer zone ( 1 - 100 mq/kq contour area): Area = 2, 211 ft2 and h = 35 ft V1 = 2 ,211 ft2 • 35 ft - V100-V11000 V1 = 40 , 040 ft' V, • typical weight of soil • average concentration of contaminant -� 40, 040 ft3 • 100 lbs/ft3 • 0 .000023 -a 92 lbs of TPH-g All together, the weight of TPH-g equals : 11 , 258 lbs + 723 lbs + 92 lbs =+ 12,073 lbs of TPH -g Converting pounds of TPH-g to volume (gallons) using density of TPH-g equal to 6 .25 lbs/gal : 12 , 073 lbs = 6 . 25 lbs/gal -> 1 ,931 gallons of TPH-g 60 to 100 foot zone: • >1 ,000 mg/kg (Inner zone) : The sum B4-70 ( 2 ,500mg/kg ) and the 1 ,000 mg/kg contour line; average = 1 ,750 mg/kg (equivalent to 0 .00175) . • 1004 ,000 frig/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 .00055) . • 1 - 100 mg/kg (Outer zone) : The sum of MW7-60 (6 .5 mg/kg ), MW7-70 ( 1 . 1 mg/kg ), the 1 mg/kg and the 100 mg/kg contour lines average = 27 mg/kg (equivalent to 0.000027) . 1 ) For the estimated inner zone (> 1 , 000 mq/kq contour area): Area = 70 ft2 and h = 7 ft Advanced GeoEnvironmcntat, Inc.