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TABLO <br /> ESTIMATED MASS OF TPH g AND BENZENE IN SOIL <br /> CALTRANS-SHOP 10 MAINTENANCE STATION,STOCKTON,CALIFORNIA <br /> FEBRUARY 2000 <br /> contour was impacted at the highest concentration observed within the said isoconcentrahon contour (i a the soil volume within the 100 mg/kg <br /> is all impacted at 240 mg/kg) <br /> Arithmetic Mean of Mass-Total mass based on arithmetic mean of mass estimated by isoconcentration contour and mass estimated by maximum detected concentration <br /> for the respective isoconcentration interval(I e,10 0 mg/kg to 100 mglkg and>100 mglkg) <br /> Key Equations and Constants <br /> Volume=(Area)(Depth Interval)=(AJ(z,) <br /> Mass of Contaminant(Mi)=(Volume)(Concentration)(Bulk Density of Soil)=(V,)(Ca(p b) <br /> A,=area of contaminant at depth interval i (from Autocad) <br /> zi=depth interval=3 05 meters <br /> V,=volume of sod in depth interval i(m3) <br /> C,=concentration of contaminant over depth interval i(mg/kg-TPH-G pg/kg benzene) <br /> pt,=bulk density(kglm3)=1 650 kglm3 (Human Health Risk Assessment Shop 10 February 1999) <br /> m,=mass of contaminant in depth interval i <br /> Mass(lotal)=Emi <br /> i <br /> Sample Calculations <br /> i <br /> CASE TPH-g,>100 mg/kg,21-30 feet bgs <br /> A21 wieei bgs= 53 m2 (from Autocad) <br /> V21 30reei bgs= (A21 wieei bpsl(Z21 wieei bps)_(53 m2)(3 05 m)=162 m5 <br /> M21 34 feei bgs a (V21 30 feel bps)(C21 30(eet bps)(pb)=(162 m)(100 mglkg)(10$kglmg)(1 650 kg/M3)=2.6 ka <br /> and <br /> MTPH-9 TOTAL= Em,=7 6kg+0 7kg+2 2kg+2 6kg+1 kg+16 7kg+2 Skg+0 3kg+25 9kg+7 4kg=67 kq <br /> Page 2 of 2 <br />