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fir moo Am No : "W <br /> TABLE 5-4 <br /> ESTIMATED MASS OF TPH-g AND BENZENE IN SOIL <br /> CALTRANS-STOCKTON YARD MAINTENANCE STATION,STOCKTON,CALIFORNIA <br /> FEBRUARY 2000 <br /> Key Equations and Constants <br /> I <br /> Volume=(Area)(Deplh Interval)=(AJ(Z,) <br /> Mass of Contaminant(MJ=(Volume)(Concentration)(Bukk Density of Soil)=(V,)(Q(pb) <br /> A,=area of contaminant at depth interval f (from Autocad) <br /> Z,=depth interval=3 05 meters <br /> V,=volume of sod In depth interval f(0) <br /> C,=concentration of contaminant over depth interval i(mg/kg-TPH-G,µglkg-benzene) <br /> t1b=bulk density(kg/m3)= 1 650 kglm3 (Human Health Risk Assessment, Shop 10,February 1999) <br /> M,=mass of contaminant in depth interval f <br /> Mass(total)=LM, <br /> Sample Calculations <br /> CASE TPH-g,X100 mglkg,46 to 51 feet bgs <br /> A46-5110e1bgs=214 mz f (from Autocad) <br /> V46 511-011 bgslizps=(A46 51faet b46-511%et bgs)_(214 m2)(1 52 m)=327 m3 <br /> M46 51 feet bgs=(V4&51 teal bgs)(C46-51 test bgs)(Pb)=(327 m)(100 mglkg)(1,550 kg/m3)=53,955,000 mg or 54 kR <br /> and <br /> MTPH.g TOTAL" IM,=6 kg+26 kg+54kg=86 ka <br /> 1 <br /> Page 2 of 2 S IPROJ14i040100041SYYARDTable 5-4 <br />