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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No 2093 . 3425 Tracy Boulevard Tracy California Well Date TBA MTBE DIPE EtBE TAME Ethanol Number Sampled (Ng/L) (/rg/L) (/rg/L) OIWL) Wg/L) SMW-1 11/17/1997 <500 500 <10 <10 <10 3/27/2001 — -- -- -- -- Well no longer monitored or sampled TEX-1 6/20/2001 9/12/2001 12/19/2001 3/14/2002 — 6/28/2402 - 9/11/2002 — 12/17/2002 — 3/31/2003 - -- -- — -- 6/9/2003 Not Sampled 9/18/2003 <20 <0 5 <1 0 <1 0 <1 0 <100 12124/2003 Not Sampled Notes < = below given laboratory detection limit = not measured or analyzed DIPE = Di-isopropyl ether EtBE = Ethyl tort butyl ether MTBE = Methyl tert-but)!ether TAME = Tart-amyl methyl ether TBA = Tert-butyl alcohol ugIL = micrograms per liter Data Qualifier Definitions U The analyte was analyzed for but was not detected above the sample reporting limit J The analyte was positively identified the associated numerical value is the approximate concentration of the analyte in the sample N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a "tentative identification" NJ The analysis indicates the presence of an analyte that has been`tentatively identified"and the associated numerical value represents its approximate concentration UJ The analyte was not detected above the reported sample reporting limit However,the reported reporting limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample R The sample results are rejected due to identification or other analytical issues NO Not detected above reported detection limit K\W prccews JS BP AHCM2M\GuwterWA OTR 03~2093 GW MR 4=3 Page 4 of 4