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CONTAMINANT MASS CALCULATIONS <br /> Tuff Boy Trailers, 5151 Almondwood Dr Manteca <br /> Mass in soil <br /> Based on Concentrations from drilling investigations in December 1999 and January 2001 <br /> mass = (Volume of impacted zone)(soil density)(Average Concentration)(E-6), <br /> Volume in cu ft , thickness of impacted zone is 7 ft 5-12 ft deep) <br /> Sod density assumed 45 5 kg/cu ft (100lb/cu ft ), <br /> Area (sq ft } Volume (cu ft ) Average Mass of Mass of <br /> [Contaminant (pi x r, x r2) (pi x r, x r2 x h) Concentration Contaminant Contaminant <br /> (mg/kg) k ) lbs <br /> TPHG Zone 1 7351 51451 310 726 1597 <br /> TPHG Zone 2 1 13001 91001 41 170 373 <br /> TPHG Zone 3 1 14831 103811 1 2 06 1 2 <br /> Total estimated mass of TPHG in Soil 901 1982 <br /> Benzene Zone 1 3771 2639 0951 01 03 <br /> Benzene Zone 2 8171 5719 0251 01 01 <br /> Benzene Zone 3 7691 5383 00251 00 00 <br /> Total estimated mass of Benzene in Sod = 02 04 <br /> Toluene Zone 1 377 2639 09 01 02 <br /> Toluene Zone 2 817 5719 025 01 01 <br /> Toluene Zone 3 769 5383 0 025 00 00 <br /> Total estimated mass of Toluene in Soil = 02 04 <br /> Ebenz Zone 1 3771 2639 1 351 0 2 0 4 <br /> Ebenz Zone 2 8171 5719 0 25 0 1 0 1 <br /> Ebenz Zone 3 769 5383 0 025 0 0 0 0 <br /> Total estimated mass of Eth (benzene in Sod = 0 2 0 5 <br /> Xylenes Zone 1 95 665 555 0 2 0 4 <br /> Xylenes Zone 2 800 5600 2 1 0 5 1 2 <br /> Xylenes Zone 3 833 5831 025 0 1 0 1 <br /> Xylenes Zone 4 732 5124 0 025 0 0 0 0 <br /> Total estimated mass of Xylenes 3n Sod = 0 8 1 7 <br /> contmass As Page 1 <br />