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• i <br /> Tosco(Former BP Oil)Service Station No 11144 <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=Methyl tertiary butyl ether according to EPA Method 8020 <br /> ANALYTICAL LABORATORY <br /> Sequoia Analytical(ELAP#1271 & 12 10) <br /> ' =Elevated detection limit See analytical report for detection limit <br /> 2=MTBE Concentrations used in Mass Removal Calculations is the Average of 7,200 ppb(MW-2,3116100)and 22,000 ppb(MW-2,6116100) <br /> s=MTBE Concentrations used in Mass Removal Calculations is the Average of 22,000 ppb(MW-2,6116100)and 61,000 ppb(OBS-W,8121100) <br /> 4=Approximately 90%Purged Volume from OBS-W and 10%from AMW-5 and MW-2 <br /> 5=The reporting limits for this sample have been raised due to high levels of non-target compounds <br /> s=Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> MtBE Removed(lbs)=MtBE concentration(ppb) *gallons removed*8 337lbs/gal H2O/ 1 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)12 <br /> 140187 5 <br />