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• <br /> Table 3. Mass Balance Calculations (Soil) <br /> Total Petroleum Hydrocarbons as gasoline(TPHg) <br /> Former Unocal Service Station No 0123 <br /> 1034 Central Avenue <br /> Tracy,California <br /> Avg conc Pounds of <br /> Zone TPH Zone Pounds of TPH per Pounds of <br /> Volume per zone Volume soil in pound of TPH in <br /> W) (ppm) (Yds 3) zone soil zone <br /> 942 4233 35 97689 0004233 414 <br /> 4160 310 - 154 431407 0000310 134 <br /> 6359 10 236 659452 0000010 7 <br /> 15682 2 581 1626291 0000002 3 <br /> . = Total Pounds of TPHg in Soil 557 <br /> Average Conccntration=(sum of detected concentrations in zone)/(number of detected <br /> concentrations in zone) <br /> Zone Volume=(zone area)(zone height) <br /> Pounds of Soil in Zone=(zone volume in yds3)(1 4 tons of soil/yds 3)(2000 lbs/ton) <br /> Pounds of TPH per pound of soil is egivalent to average concentration(ppm)/1,000,000 <br /> Pounds of TPH in zone=(Pounds of TPH per million pounds of soil)(Pounds of soil in zone) <br /> i <br /> 240073 06 <br />