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Appendix B <br /> AGE-NC-Project No. 98-0520 <br /> Page 6 of 6 <br /> Converting to gallons of water: <br /> V2GW • average density of water 33,191 ft3 • 7.48 gal/ft3 -4 248,269 gallons <br /> Using 433 pg/1 as the average concentration of gasoline in the inner zone, the gallons of gasoline <br /> are: <br /> Gallons of water• average concentration of contaminant 4 <br /> 248,269 gal • 0.00000043 4 0.11 gallon of gasoline <br /> 3) Approximate volume of soil to the boundary of the third (outer) zone (V3): <br /> V3 =(15,818 ft2)(10.6 ft) 4 167,671 ft3 <br /> V3GW=average soil porosity• V3 = 0.45 • 167,671 ft3 -i� 75,452 ft3 <br /> Subtract the total volume of water in the second zone (V26w) to get the volume of water within the <br /> third zone of contamination (V3GW): <br /> V3GW= V3GW - V2Gw= 75,452 ft3 - 49,422 ft3 -+ 26,030 ft3 <br /> Converting to gallons of water: <br /> V3GW • average density of water -4 26,030 ft3 • 7.48 gal/ft3 -4 194,704 gallons <br /> Using 75 µg/l as the average concentration of gasoline in the inner zone,the gallons of gasoline are: <br /> Gallons of water • average concentration of contaminant 4 <br /> 194,704 gal • 0.000000075 -4 0.01 gallon of gasoline <br /> All together, the gallons of gasoline from zones 1, 2 and 3 are: <br /> g g <br /> 0.17 gal + 0.11 gal + 0.01 gal -1t 0.29 gallon of gasoline <br /> Combining the total volume of gasoline at the different concentrations,impacted ground water yields <br /> a grand total of approximately 167,671 ft3 containing an estimated 0.29 gallon of gasoline. <br /> Advanced GCOF.nvironmental,Inc. <br />