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Table 1 - Groundwater Removal and Analytical Data <br /> Tosco(Former BP)Service Station No 11193 <br /> 3202 West Hammer Lane <br /> Stockton California <br /> EXPLANATION ANALYTICAL METHODS <br /> ppb=parts per billion TPHg = Total Petroleum Hydrocarbons as gasoline according to EPA Method 8015 Modified <br /> ND=Not Detected Benzene,Toluene Ethylbenzene,and Total Xylenes according to EPA Method 8020 <br /> --=Not Applicable MtBE=Methyl tertiary butyl ether according to EPA Methods 8020 <br /> NA=Not Analyzed <br /> ANALYTICAL LABORATORY <br /> Sequoia Analytical(ELAP#1271&12 10) <br /> '=Total volume includes about 500 gallons from MW-2,all other groundwater was purged from MW-t <br /> The Samples are from MW-2 and MW-I,the two concentrations were averaged for use in the MTBE mass removal calculations <br /> '=Chromatogram Pattem Gasoline C6-C12 <br /> °=VOCs including MTBE and BTEX by 8260E <br /> '=Chromatogram Pattern Unidentified Hydrocarbons C6-C12 <br /> MTBE Removed(lbs)=MTBE concentration(ppb)' *gallons removed*8 337lbslgal H2O/l x l0°ppb <br /> "=MTBE Concentration(ppb)=(MTBE concentration from MW-I water sample prior to purging event+MTBE concentration from MW-I <br /> sample following purging event)12 (Unless noted otherwise) <br /> 140205 04 2 <br /> I]III101 <br />