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4e 2 <br /> Groundiâ–ºater Analytical Results - Oxygenate Compounds <br /> Tosco (Former BP Oil) SS #11195 <br /> 16500 South I-5 <br /> Lathrop, California <br /> Well ID Date Ethanol TBA 1VITBE DIPS ;ETBE..';. TAME <br /> (Ppb) (Ppb) (ppb) (Ppb) (PPb) (Ppb) <br /> NIIV-10 05/20/99 ND Nil 3.52 ND ND ND <br /> 08/11/99 ND 550 1,1002 ND ND 7.3 <br /> MW-11 05/20/99 ND' ND' 1,780 NDS ND` NDS <br /> 08/11/99 ND' NDS 16,000 N,D' NDt NDt <br /> MW-12 05/20/99 UNABLE TO LOCATE -- - -- -- <br /> 08/11/99 ND ND ND ND ND ND <br /> EXPLANATIONS: ANALYTICAL METHOD: <br /> TBA = Tertiary Butyl Alcohol EPA Method 8260 for Oxygenate Compounds <br /> MTBE = Methyl Tertiary Butyl Ether <br /> DIPE = Di-isopropyl Ether <br /> ETBE = Ethyl Tertiary Butyl Ether <br /> TAME = Tertiary Amyl Methyl Ether <br /> ppb = Parts per billion <br /> -- = Not Analyzed <br /> ND = Not Detected <br /> Detection limit raised, Refer to analytical reports. <br /> Z Laboratory analyzed dilution past hold time. Initial analysis was within hold time. <br /> 11195.xls/#180175 2 As of 08/11/99 <br />