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f�) I D. <br /> Table 6 <br /> Calculations for Mass of TPHg in Soil <br /> ARCO Service Station #4493 <br /> 205 North Center Street, Stockton, CA <br /> Interval Interval Average Ib l mg Mass of kg I Ib gal I m' Density of Volume of <br /> Estimated Area Soil Density <br /> Depth(feet Zone Thickness z Concentration 3 conversion Porosity Analyte conversion conversion Analyte Analyte <br /> bgs) (feet) (ft) (mglkg) (kglR factor (pounds) factor factor (kglm3) (gallons) <br /> (T) (A) (C) (D) (Cl) (P) (M) (C2) (C3) (D) (V) <br /> 014 Core 14 72 35 54 2.2046E-06 0.35 12.00 0.4536 264.17 730 1.97 <br /> 2 14 1,375 3 54 2.2046E-06 0.35 16.37 0.4536 264.17 730 2.69 <br /> 15-30 core 15 36 30 54 2.2046E-06 0.35 5.51 0.4536 264.17 730 0.90 <br /> 2 15 184 2 54 2.2046E-06 0.35 1.86 0.4536 264.17 730 0.31 <br /> 35.76 5.87 <br /> M=AxTxCxDxC1IP <br /> V=Mx C2xC31D <br /> TPHg=total petroleum hydrocarbons as gasoline <br /> mg=milligrams <br /> _ <br /> [--=liter__. <br /> L fe=square feet <br /> lbs=pounds <br /> kg=kilograms <br /> gal=galton <br /> M3=Cubic meters <br /> The figures in Attachment B and the following assumptions were used: <br /> "the average TPHg concentration in the core o t e plume from 0 to 14 feetbgs was mg1kg, <br /> the average TPHg concentration in zone 2(between the 1 mg/kg and 10 mg/kg contour lines)from 0 to 14 feet bgs was 3 mg/kg, <br /> 'the average TPHg concentration in the core of the plume from 15 to 30 feet bgs was 30 mglkg, <br /> *the average TPHg concentration in zone 2 from 15 to 30 feet bgs was 2 mg/kg, <br /> the average TPHg concentration outside zone 2 is negligible and assumed to be 0 mg/kg,and <br /> "The porosity of the soil is 35%, <br /> mass talcs Page 1 of 1 SECOR <br />