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• <br /> TABLE 8 <br /> COMBINED VAPOR 1 GROUNDWATER EXTRACTION PILOT TEST MASS REMOVAL <br /> Thrifty Oil Station#171 -Stockton, California <br /> GHC 1252 <br /> DATE AVERAGE FLOW RUN Mass Removed During Pilot Test <br /> SAMPLED WELL No CONCENTRATION RATE TIME TPHg MTBE BENZENE <br /> TPHg(ppmV) MTBE(ppmV) BENZENE(ppmV) CFM Hrs lbs/Day Test Total lbs/Day Test TOW lbs{bay Test Total <br /> lbs Ibs lbs <br /> 03/17/05 EW5-D 233 0 093 1 22 115 800 1 0 033 00036 00012 0 042 00139 <br /> 03/24/05 EW5-S 2,301 1 11 164 102 800 1 874 2913 1 00379 00126 1 0 496 01652 <br /> Accumulative Totals 2947 00138 0 1791 <br /> NOTES <br /> CFM Cubic feet per minute lbs Ipay CHC 'Q-MW" CHC = Vapor phase hydrocarbon concentration(ppmV*10-') <br /> = <br /> ppmV Parts per million by volume V AIR Q= Volumetric flow rate(cubic feetlday) <br /> MTBE Methyl-tert-butyl ethane MWHC= Molecular weight(98 lb/lb-mole-gasoline,88 Ib/lb-mole-MTBE <br /> TPHg Total petroleum hydrocarbons 78 lb/lb-mole-Benzene) <br /> ND Non Detect V,,,= molar volume of air constant(from ideal gas law-379 feet3/Ib-mole) <br /> I <br />