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Table 8: Remaining Contaminant Mass Calculations <br /> Speedy Foods -8200 N. Hwy 99, Stockton, CA <br /> Mass Estimate in Soil <br /> Average Mass of Mass of <br /> Contaminant Volume(cu. ft.) Concentration Contaminant Contaminant <br /> (mg/kg) kObs) <br /> TPHg Core 875 1,775 71 155 <br /> Total estimated mass of TPHg In Soil= 71 155 <br /> MTBE Core 2,650 5.0 1 1 <br /> Total estimated mass of MTBE in Soil = I 1 1 <br /> Based on average concentrations from data collected during the installation of VW2 <br /> The calculations assume a 15-foot radius <br /> Mass = (Volume of impacted zone)(soil density)(Average Concentration)(E-6) <br /> Volume in cu. ft.; [(Area' 5 for TPHG)and (Area ' 15 for MTBE)] <br /> Soil density assumed 45.5 kg/cu.ft. (100lb/cu. ft.) <br /> Mass Estmate in Groundwater <br /> Volume 'Concentration Mass of Mass of <br /> Contaminant (cu. ft.) (Ug/1) Contaminant Contaminant <br /> k lbs <br /> TPHg Core 7,500 34,0001 2.16 4.76 <br /> TPHg ND to Core Contour line 24,000 10,C)OOI 2.04 4.48 <br /> Total estimated mass of TPHg In GW 1 4.20 9.24 <br /> Benzene Core 8,500 1,1001 0.08 0.17 <br /> Benzene ND to Core Contour line 35,500 501 0.02 0.03 <br /> Total estimated mass of TPHg In GW= _ 0.09 0.21 <br /> MTBE 50 u /L contour to core of plume 20,000 3,400 0.581 1.27 <br /> MTBE ND to 50 ug/L contour 120,000 5010.05 0.11 <br /> Total estimated mass of TPHg In GW 1 0.631 1.38 <br /> ' Based highest concentration detected in the most contaminated well in the contour interval in the past <br /> year or the value of the highest contour interval In the area whichever is greater <br /> Mass= (Volume)(porosity)(Conc. in ppb)(E-9)(7.48 gal/cu ft)(6.34 Ib/gal)(0.4536 kg/lb) <br /> Volume in cubic feet; Thickness of aquifer is 10 feet; Porosity is 0.30 <br />