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Table 1 - Groundwater l and Analytical Data . <br /> Tosco Former BP Oil ce Station No 11194 <br /> 2375 Tracy Boulevard, <br /> Tracy,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=Mcthyl tertiary butyl ether according to EPA Method 8020 <br /> ANALYTICAL LABORATORY, <br /> Sequoia Analytical(FLAP#1271 & 1210) <br /> =Elevated detection limit See analytical report for detection limit <br /> 2=MTBE Concentration used in Mass Removal Calculations is the Average of 7,200 ppb(MW-2,3116100)and 22,000 ppb(MW-2,6116100) <br /> 3=MTBE Concentration used in Mass Removal Calculations is the Average of 22,000 ppb(MW-2,6116100)and 61,000 ppb(OBS-W,8121100) <br /> "=Approximately 90%Purged Volume from OBS-W and 10%from AMW-5 and MW-2 <br /> MtBE Removed(lbs)=MtBE concentration(ppb) *gallons removed* 8 337Ibs/gal H2011 x 109 ppb <br /> MTBE Concentration(ppb)=(MTBE concentration from OBS-W water sample prior to purging event+MTBE concentration from OBS-W <br /> sample following purging event)/2 (Unless Noted Otherwise) <br /> 140187 <br />