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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 /> Soil density assumed 45 5 kg/cu ft (100lb/cu ft ), <br /> Area (sq ft) Volume (cu ft) Average Mass of Mass of <br /> Contaminant Concentration Contaminant Contaminant <br /> (pi x r, x rZ) (pi x r1 x rZ x h) (mg/kg) k lbs <br /> TPHG Zone 1 735 5145 310 726 1597 <br /> TPHG Zone 2 1300 9100 41 170 373 <br /> TPHG Zone 3 1483 10381 1 2 06 12 <br /> Total estimated mass of TPHG in Soil = 901 1982 <br /> Benzene Zone 1 377 2639 095 01 03 <br /> Benzene Zone 2 8171 5719 025 01 01 <br /> Benzene Zone 3 7691 5383 0 025 00 00 <br /> Total estimated mass of Benzene in Sod = 02 04 <br /> Toluene Zone 1 3771 26391 091 01 02 <br /> Toluene Zone 2 8171 57191 0251 01 01 <br /> Toluene Zone 3 7691 53831 00251 00 00 <br /> Total estimated mass of Toluene in Soil 02 04 <br /> Ebenz Zone 1 377 2639 a,< 1 35 1 -► 0 2 04 <br /> • Ebenz Zone 2 817 5719 025 / 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 00 <br /> Total estimated mass of Xylenes in Soil = 0 8 1 7 <br /> i <br /> contmass As Page 1 <br />