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' mass calc2 <br /> CONTAMINANT MASS CALCULATIONS <br /> Gonzales Trucking <br /> Mass in unsaturated soil. <br />' Based on isoconcentration contours shown on attached sketches. <br /> Zone 1 = 13-23'CLAY AND SAND <br /> Zone 2=23-38'-SAND AND CLAY <br />' Zone 3=3843' SILT <br /> Zone 4=4348 SAND <br /> Zone 5=48-60 CLAY AND SILT(Xylenes only) <br /> Mass =(Volume of impacted zone)(soil density)(Average Concentration)(E-6); <br /> Soil density assumed 45.5 kg/cu. ft. (100lblcu. ft.); <br /> Average concentration used is 112 concentration at source, since perimeter borings all ND; <br /> Where source concentration is ND, 112 detection limit used in mass calculation <br />' Radius of Zone Area Average Mass of <br /> -C-o-ntam-inant of Impact (ft) (sq.ft.) Volume(cu.ft.) Concentration Contaminant <br /> m Ik k <br /> ' TPHD Zone 1 61 1131 11311 4801 25 <br /> TPHD Zone 2 10 3141 4712 0 0 <br /> TPHD Zone 3 13 5311 2655 0 0 <br /> TPHD Zone 4 10 3141 1571 0 0 <br /> ' Total mass of TPHD in Unsaturated Soil = 25 <br /> Avera a Concentration of TPHD in Unsaturated Soil = 54 <br /> TPHG Zone 1 6 113 1131 480 25 <br /> ' TPHG Zone 2 10 314 4712 800 172 <br /> TPHG Zone 3 13 531 2655 15500 1872 <br /> TPHG Zone 4 10 314 1571 0.8 0 <br /> Total mass of TPHG in Unsaturated Soil = 2068 <br /> Avera a Concentration of TPHG in Unsaturated Soil = 4515 <br /> Benzene Zone 1 6 113 1131 2.5 0.13 <br /> Benzene Zone 2 10 314 4712 5 1.07 <br /> Benzene Zone 3 13 531 2655 35 4.23 <br /> ' Benzene Zone 4 10 314 1571 0.0025 0.00 <br /> Total mass of Benzene in Unsaturated Soil= 5.43 <br /> Avera a Concentration of Benzene in Unsaturated Soil = 12 <br /> Toluene Zone 1 6 1131 1131 2.5 0.13 <br /> ' Toluene Zone 2 10 314 4712 5 1.07 <br /> Toluene Zone 3 13 531 2655 450 54.35 <br /> Toluene Zone 4 10 314 1571 0.0025 0.00 <br /> ' Total mass of Toluene in Unsaturated Soil = 55.55 <br /> Avera a Concentration of Toluene in Unsaturated Soil = 121 <br /> Ebenz. Zone 1 61 1131 11311 3.5 0.18 <br /> Ebenz. Zone 2 10 314 47121 15.5 3.32 <br /> Ebenz. Zone 3 13 531 26551 400 48.31 <br /> Ebenz. Zone 4 10 314 15711 0.0025 0.00 <br /> Total mass of Eth (benzene in Unsaturated Soil= 51.82 <br /> Avera a Concentration of Eth (benzene in Unsaturated Soil = 113 <br /> X lenes Zone 1 6 113 1131 38 1.96 <br /> Xylenes Zone2 10 314 4712 115 24.66 <br /> Xylenes Zone 3 13 531 2655 1900 229.49 <br /> ' <br /> Xylenes Zone 4 10 314 1571 0.0225 0.00 <br /> Xylenes Zone 5 10 314 3770 0.02 0.00 . <br /> Total mass of Xylenes in Unsaturated Soil = 256.11 <br /> Avera a Concentration of Xylenes in Unsaturated Soil = 407 <br /> Page 1 <br />