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i� <br /> Table 5 <br /> Calculation of Residual Dissolved-Phase TPHg Mass <br /> 1817 South Fresno Ave. , Stockton , CA <br /> TPHg mass (lbs) = Vol. x (ft3) * TPHg con . x (mg/L) * 28. 31 (L/ft3) * 0 . 0000022 (lbs/mg) <br /> i <br /> where, Vol, xft3 <br /> ( ) = Area x (ft2)* Thickness x (ft) * porosity (unitless) <br /> TPHg con . x (mg/L) = Average TPHg concentration for specific volume <br /> (see below) <br /> Volume calculations: <br /> Volume x Area x (ft2) hft <br /> ( ) porosity Vol . x (ft3) <br /> Vol. 1 (TPHg 0. 1 to 1 mg/L) 13 , 195 <br /> Vol . 2 (TPHg 1 to 10 mg/L) 10, 142 15 0. 35 69,274 <br /> Vol . 1 (TPHg > 10 mg/L) 5,320 15 0 . 35 53,246 <br /> 15 0 . 35 27, 930 <br /> volume x Vol. x TPHg con. x Conversion Conversion TPHg mass <br /> (L/ft3) (lbs/mg) (lb) <br /> Vol. 1 (TPHg 0. 1 to 1 mg/L) 69 ,274 0. 32 28 . 31 0.0000022 1 ,4 <br /> Vol. 2 (TPHg 1 to 10 mg/L ) 53 ,246 3 , 2 <br /> Vol . 1 (TPHg > 10 mg/L) 273930 28. 31 0. 0000022 10.6 <br /> 12 28.31 0 . 0000022 20.9 <br /> Dissolved TPHg (Ibs) =1 32,g <br /> Dissolved TPHg (gals) =1 5.4 <br /> 150 ,449 1125435. 615 <br /> e <br />