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TABLE <br /> CONTAMINANT MASS CALCULATIONS <br /> RESIDUAL SOIL AND GROUNDWATER CONTAMINATION <br /> 612 W 11th STREET, TRACY, CA <br /> CONTAMINANT MASS CALCULATIONS <br /> Souza <br /> Mass in soil <br /> Based on estimated extent shown on attached figures <br /> Values derived from samples collected by Ground Zero <br /> mass = (Volume of impacted zone)(soil density)(Average Concentration)(E-6), <br /> Volume in cu ft , thickness of impacted zone is aprox 5 ft <br /> Soil density assumed 45 5 kg/cu ft (100lb/cu ft), <br /> Average concentration derived from all results within or bordering zone <br /> At&R- c i m Average, Ma"of Mao*ofContaminantConceia 'Oort Contaminant Contaminant <br /> ftfk 141 <br /> 10-12 5' Depth 8501 21251 1751 17 37 <br /> 12 5-15' Depth 1 7001 1750 6731 54 118 f <br /> Total mass of TPHG in Soil = 71 155 <br /> Average Concentration of TPHG in Soil (mg/kg) = 400 <br /> The concentrations of BTEX constituents were generally ND to very low, their mass is negligable <br /> • I <br /> Mass in groundwater <br /> Based on estimated extent shown on attached figures <br /> Values derived from samples collected by Ground Zero from site monitoring wells <br /> Area Volume Average Mass of Mass of <br /> Contaminant (-sq.ft (cu ft) Concentration Contaminant Contaminant <br /> (Ugtl) k lbs <br /> TPHg 1300 19500 1500 00290 00637 <br /> Benzene 1300 19500 0 5 000010 000021 <br /> Toluene 1300 19500 05 000010 000021 <br /> Eth (benzene 1300 19500 12 000023 000051 <br /> ,Xylenes 1300 19500 05, 000010, 000021 <br /> NOTES <br /> Based on isoconcentration contours shown on isoconcentration map <br /> Concentrations based upon most recent groundwater analytical results <br /> mass = (Volume in cu ft)(porosity)(Conc in ppb)(E-9)(7 48 gal/cu ft)(8 34 Ib1gal)(0 4536 kg/lb) <br /> Aquifer thickness = 15 feet, porosity = 0 35, <br /> • <br /> Pagel <br />