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CONTAMINANT MASS CALCULATIONS <br /> Former Reeves Exxon, 2360 East Street, Tracy, CA <br /> • Mass in soil. <br /> Based on estimated extent shown on attached figure <br /> Values derived from samples collected by RESNA (1991), EPM (1994), and Ground Zero (1997) <br /> mass= (Volume of impacted zone)(sod density)(Average Concentration)(E-6), <br /> Volume in cu ft , thickness of impacted zone is 7 ft around pipeline and 5 ft elsewhere, <br /> Soil density assumed 45 5 kg/cu ft (100lb/cu ft), <br /> Average concentration derived from all results within or bordering zone <br /> Area Volume Average Mass of Mass of <br /> Contaminant (sq ft ) (cu ft ) Concentration Contaminant Contaminant <br /> (mglkg) (kg) (lbs) <br /> TPHD Zone 1 760 5320 86 21 46 <br /> TPHD Zone 2 760 3800 1 7 03 06 <br /> TPHD Zone 3 1650 8250 96 36 79 <br /> TPHD Zone 4 245 1225 110 61 135 <br /> Total mass of TPHG in Soil = 121 , 266 <br /> Average Concentration of TPHG in Soil (mg/kg) = 1431 <br /> TPHG Zone 1 760 5320 322 779 171 5 <br /> TPHG Zone 2 760 3800 356 62 135 <br /> TPHG Zone 3 1650 8250 441 1655 3642 <br /> TPHG Zone 4 245 1225 0 00 00 <br /> Total mass of TPHG in Soil = 2496, 5492 <br /> Average Concentration of TPHG in Soil (mg/kg) = 29511 <br /> Benzene Zone 1 760 5320 051 01 0 3 <br /> Benzene Zone 2 760 3800 023 00 01 <br /> Benzene Zone 3 1650 8250 1 1 04 09 <br /> Benzene Zone 4 245 1225 00075 00 00 <br /> Total mass of Benzene in Soil = 06 1 3 <br /> Average Concentration of Benzene in Soil (mg/kg) W 071 <br /> Toluene Zone 1 760 5320 041 01 02 <br /> Toluene Zone 2 760 3800 018 00 01 <br /> Toluene Zone 3 1650 8250 47 1 8 39 <br /> Toluene Zone 4 245 1225 0 012 00 00 <br /> Total mass of Toluene in Soil = 1 9 42 <br /> Average Concentration of Toluene in Soil (mg/kg) = 221 <br /> Ebenz Zone 1 760 5320 3 1 0 8 1 7 <br /> Ebenz Zone 2 760 3800 043 0 1 0 2 <br /> Ebenz Zone 3 1650 8250 3 1 1 2 2 6 <br /> Ebenz Zone 4 245 1225 009 0 0 0 0 <br /> Total mass of Ethylbenzene in Soil = 2 0 4 4 <br /> Average Concentration of Ethylbenzene in Soil (mg/kg) = 2 4 <br /> Xylenes Zone 1 760 5320 102 2 5 5 4 <br /> Xylenes Zone 2 760 3800 0 79 0 1 0 3 <br /> Xylenes Zone 3 1650 8250 1452 5 5 120 <br /> Xylenes Zone 4 245 1225 0 075 0 0 0 0 <br /> Total mass of Xylenes in Soil = 81 , 177 <br /> Average Concentration of Xylenes m Soil (mg/kg) = 9 5 <br /> contmass xis Page 1 <br />