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Table 2 <br /> Fuel Oxygenates Analytical Data <br /> ARCO Service Station No 2093 <br /> 3425 Tracy Boulevard,Tracy,California <br /> Well Date TBA MtBE DIPE EtBE TAME Ethanol <br /> Number Sampled WWL) (pglL) (pg/L) WWW) (pg/L) (pglL) <br /> SMW-1 11/17/1997 <500 500 <10 <10 <10 -- <br /> 3/27/2001 -- -- -- __ -- <br /> Well no longer monitored or sampled <br /> 9/18/2003 Not Sampled <br /> TEX-1 6/20/2001 <br /> 9/12/2001 <br /> 12/19/2001 -- -- -- -- -- - <br /> 3/14/2002 - -- - -- - - <br /> 6/28/2002 - -- -- -- - -- <br /> 9/11/2002 -- -- __ <br /> 12117/2002 <br /> 3/31/2003 -- -- -- __ __ -- <br /> 6/9/2003 Not Sampled <br /> 9/18/2003 <20 <0 5 <1 0 <1 0 <1 0 <100 <br /> Notes <br /> < = below given laboratory detection limit <br /> -- = not measured or analyzed <br /> DIPE = Di-isopropyl ether <br /> EtBE = Ethyl tert-butyl ether <br /> MtBE; = Methyl cert-butyl ether <br /> TAME = Tert-amyl methyl ether <br /> TBA = Tert-butyl alcohol <br /> pg/L = micrograms per liter <br /> Data Qualifier Definitions <br /> U The analyte was analyzed for,but was not detected above the sample reporting limit <br /> J The analyte was positively tdentrfied,the associated numerical value is the approximate concentration of the <br /> analyte in the sample <br /> N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a <br /> "tentative identification" <br /> NJ The analysis indicates the presence of an analyte that has been"tentatively identified"and the associated numerical <br /> value represents its approximate concentration <br /> UJ The analyte was not detected above the reported sample reporting limit However,the reported reporting limit is <br /> approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely <br /> measure the analyte in the sample <br /> R The sample results are refected due to serious deficiencies in the ability to analyze the sample (i a the presence <br /> or absence of the analyte cannot be verified)or the analyte identification has been refected(i e,the presence <br /> of the analyte cannot be verified) <br /> ND Not detected above reported detection limit <br /> s <br /> KlWpmcessV5 RP ARCQK020935Quarteryfl3 QTR 030W3 GWMR 3403 Page 4 of 4 <br />