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Table 5 <br /> Mass Calculations for Petroleum Hydrocarbons Remaining in Groundwater <br /> 7-Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton,California <br /> Assumed Mean lbs t k I Ib al/m3 Density of <br /> Area Contaminant 3 µg Mass of g g Volume of <br /> Analyte Interval lL L 1 ft conversion <br /> IYt (µg 1 z Saturated Concentration conversion conversion conversion Analyte <br /> (ft} Thickness Porosity (µglL) factor factor Analyte°(lbs) factor factor (kglm') Analyte`(gal) <br /> A (T) P C C1 C2 (M) (C3) (C4) (D V <br /> Pre-remediation <br /> >10,000 1,213 15 0.35 27,000 28.32 2.20E-09 10.73 0.45 264.17 730 1.76 <br /> 1,000 to 10,000 8,063 15 0.35 7,267 28.32 2.20E-09 19.20 0.45 264.17 730 3.15 <br /> TPHg 100 to 1,000 8,885 15 0.35 315 28.32 2.20E-09 0.92 0.45 264.17 730 0.15 <br /> TOTAL= 10.73 TOTAL= 5.06 <br /> >1,000 4,745 15 0.35 1,867 28.32 2.20E-09 2.903 0.45 264.17 879 0.3957 <br /> 100 to 1,000 4,392 15 0.35 310 28.32 2.20E-09 0.446 0.45 264.17 879 0.0608 <br /> Benzene 10 to 100 4,785 15 0.35 50 28.32 2.20E-09 0.078 0.45 264.17 879 0.0107 <br /> TOTAL= 3.428 TOTAL= 0.467 <br /> >10,000 1,860 15 0.35 36,000 28.32 2.20E-09 21.94566 0.45 264.17 740 3.553641 <br /> 1,000 to 10,000 6,683 15 0.35 5,745 28.32 2.20E-09 12.58331 0.45 264.17 740 2.037603 <br /> MtBE 100 to 1,000 6,047 15 0.35 800 28.32 2.20E-09 1.58549 0.45 264.17 740 0.256737 <br /> 10 to 100 7,935 15 0.35 50 28.32 2.20E-09 0.13003 0.45 264.17 740 0.021056 <br /> TOTAL= 21.9457 TOTAL= 3.55364 <br /> Post-remediation <br /> >500 374 15 0.35 720 28.32 2.20E-09 0.09 0.45 264.17 730 0.01 <br /> GRO 50 to 500 2,712 15 0.35 220 28.32 2.20E-09 0.20 0.45 264.17 730 0.03 <br /> TOTAL= 0.09 TOTAL= 0.01 <br /> Definitions lbs=pounds MtBE=methyl tertiary butyl ether <br /> =square feet kg=kilograms <br /> ft=feet gal=gallon <br /> µg=micrograms m'=cubic meters <br /> L=liter TPHg=total petroleum hydrocarbons as gasoline <br /> '=cubic feet <br /> Assumptions: <br /> Assumed contaminant thickness was estimated to be 15 ft <br /> Mean concentration calculated from analytical results of groundwater samples;if no samples were collected from an area,an assumed mean concentration was used based on the interval. <br /> Calculations: <br /> M=AxTxPxCxC1 xC2 <br /> V:\1857\active\7-Eleven\active\185750063_711_14117\05_report_deliv\tables\14117_gw mass_calcs.xlsx <br />