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Appendix B AGE-NC-Project No. 98-0520 Page 2of6 3a) For the estimated first portion of the third zone (10 mg/kg contour line): a= 53.3 ft, b = 73 ftand h= 13.8 ft 3b) For the estimated second portion of the third zone (10 mg/kg): a=40.5fl,b = 155.5ft,h= 5.5ft 4) For the estimated fourth (outer) zone (1 mg/kg contour line): a= 89.2ft, b = 95ft and h= 21 ft The average TPH-g concentration in each zone was estimated by adding all soil samples within the selected area and dividing by the total number of samples or adding the two boundary concentrations and dividing by two. The average zones (reported as milligrams per kilogram, mg/kg) were as followsK5--85 mg/kg (0.000585), 234 mg/kg (0.000234), 53.2 mg/kg (0.000053) and 4.5 mg/kg (0.0000045).JR_Z5• � a -� � U ,vu-'f 5 vca 1) Approximate volume of soil in inner zone (Vl): V 1 ={'/3)(3.14}3 33 ft)'(6.5 ft) -i 1,880 ft, The volume of the tank pit in the first zone (TI) should be subtracted from the total volume of the inner zone to get the volume of soil within the first zone of contamination (V,): T, =4 ft x 15 ft x1.5 ft V, =V1 - T, = 1,880ft3 - 90ft3 -> 1,790ft' Using 585 mg/kg as the average concentration of gasoline in the inner zone,the weight of gasoline is: V, - typical weight of soil - average concentration of contaminant -� 1,790 ft3 - 125 lbs/ft' - 0.000585 -4 130.9 lbs of gasoline 2) Approximate volume of soil to the boundary of the second zone (V2): V2 =(1/3)(3.14)(41.8 ft)(62 ft)(9.75 ft) -i 26,447 ft3 The total volume of the inner zone(V 1)and the volume of the tank pit in the second zone(TZ)should be subtracted from the overall volume to the boundary of the second zone (V2) to get the volume . of soil within the second zone of contamination (V2): Advanced Geo Environ mental,Inc.