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CONTAMINANT MASS CALCULATIONS <br /> QUANTITY REMOVED IN SOIL AND GROUNDWATER <br /> 8960 W. Walnut Grove Rd, Thornton, CA <br /> Mass remaining in soil. <br /> Based on average concentration of excavation confirmation soil samples, and samples collected <br /> from borings and wells not removed by excavation (H136, HA3, SB3 below 15', S134, S65, MW1-MW7) <br /> Only detectable concentrations used in averaging, ND results ignored <br /> mass= (Volume of impacted zone)(soil density)(Average Concentration)(E-6), <br /> Volume in cu ft <br /> Volume prior to remediation (125030 cf) minus volume excavated (101250 cf) = 23780 cf <br /> Soil density assumed 45 5 kg/cu ft (100lb/cu ft} <br /> M- - <br /> Total mass of TPHG in Soil = 23780 1 5 1 61 36 <br /> Avera a Concentration (mg/kg) = 1 500 <br /> Total mass of TPH D in Soil = 237801 110 L 119126 2 <br /> Avera a Concentration (Mg/kg) = 11 000 <br /> Total mass of Benzene in Sod = 237801 005 1 0051 -0121 <br /> Avera a Concentration (mg/kg) - 0 050 <br /> Total mass of Toluene in Sod = 1 237801 000 1 0001 000 <br /> • Average Concentration (mg/kg) = 0 000 <br /> Total mass of Eth (benzene in S1 237801 000 1 0001 0001 <br /> [Average Concentration (mg/kg) = 000 <br /> Total mass of Xylenes. in Soil = 237801 000 1 0 00 000 <br /> Average Concentration m /k = 000 <br /> 0 <br /> 000 <br /> Total mass of MTBE in Soil = 237801 002 0021 004 <br /> Avera a Concentration (mg/kg) = 0 016 <br /> Percent Mass removed via excavation <br /> TPHG - (3606 7-1 6)13606 7 = 99 9% <br /> TPHD - (2616 9-11 9)12616 9 = 99 5% <br /> Benzene- (9 7-0 05)19 7 = 99 5% <br /> Toluene - (20 3-0 0)120 3 = 100% <br /> Ethylbenzene -(62 2-0 0)162 2 = 100% <br /> Xylenes- (350 8-0 0)/350 8 = 100% <br /> MTBE - (43 4-0 02)/43 4 = 99 9% <br /> contmass sodla xls <br />