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1 <br /> Table 7 <br /> Hydrocarbon Mass Calculations <br /> ARCO Service Station No.548 <br /> 1612 West Hammer Lane,Stockton, CA <br /> Average <br /> Radius of Aquifer Total Water Inscribed Interval Interval Contaminant Contaminant Contaminant <br /> Area Area Thickness Volume Volumes Volume Volume Concentration Mass Mass <br /> (ft) (sq.ft) (ft) Porosity (ft') (ft')* (ft) (L) (µg/L) (µg) (lb) <br /> GRO `+ <br /> 25 1963.475 40 0.35 27488.65 27488.65 778391.98 7000 5448743851 12.01242316 ` <br /> 34 3631.643 40 0.35 50843.00704 27488.65 23354.357 661321.83 110 72745400.77 0.160376146 0.n1� <br /> 16 804.2394 40 0.35 11259.35104 11259.351 318829.35 600 191297612.7 0.421739017 <br /> 0 40 0.35 0 0 0 0 0 <br /> Total GRO 12.59453832 <br /> Benzene <br /> 19 1134.103 40 0.35 15877.44424 15877.444 449599.21 230 103407817.6 0.227975199 <br /> 31 3019.039 40 0.35 42266.54824 15877.444 26389.104 747256.3 3.9 2914299.568 0.00642493 <br /> 11 380.1288 40 0.35 5321.80264 5321.8026 150696.69 3.9 587717.0796 0.001295694 <br /> 0 40 0.35 0 0 0 0 0 <br /> Total Benzene 0.235695823 <br /> MtBE <br /> 6 113.0962 40 0.35 1583.34624 1583.3462 44835.378 55 2465945.789 0.00543648 <br /> 9 254.4664 40 0.35 3562.52904 1583.3462 1979.1828 56044.222 50 2802211.124 0.006177818 <br /> 27 2290.197 40 0.35 32062.76136 32062.761 907916.4 2.4 2178999.37 0.004803871 <br /> 22 1520.515 40 0.35 21287.21056 21287.211 602786.75 280 168780289.5 0.37209682 <br /> 36 4071.462 40 0.35 57000.46464 21287.211 35713.254 1011286.9 6.5 6573364.582 0.014491787 <br /> Total MtBE 0.403006775 <br /> *Optional for inscribed/concentric concentration intervals to eliminate rnultiple counting of inner intervals. <br /> ft =foot <br /> ft' =cubic feet <br /> GRO =gasoline range organics <br /> L=liter <br /> lb =pound <br /> MtBE=methyl tert-butyl ether <br /> µg/g =micrograms per gram <br /> µg/1.. =micrograms per liter <br /> I <br /> K:IWprocessV5 BP ARCOW054812004 SCMITable 7 Page 1 of 1 <br />