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TABLE 2 GROUNDWATER ANALYTICAL RESULTS FOR OXYGENATES AND ADDITIONAL COMPOUNDS ARCO Service Station No. 5469 130 South Wilson Way, Stockton, California USEPA USEPA Method 8260 Method 8015 M Well TBA MTBE DIPE ETBE TAME 1,2-DCA EDB Ethanol Methanol Number Date IL /L /L t1g1l, L MW-7 6/28/01 <200 <2 <2 <2 <2 <2 <2 <3,000 NA 9/14/01 <200 <2 <2 <2 <2 <2 <2 NA NA 12/14/01 <5.0 18 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA 2121102 <5.0 59 <0.50 <0.50 <0.50 <0.50 <0.50 NA NA MW-8 6/28/01 <5,000 1,600 <50[4] <50[4] <50[4] <50[4] <50[4] <75,000[4] NA 9114101 <20,000 7,500 <200 <200 <200 <200 <200 NA NA 12/14/01 <500 17,000 <50 <50 <50 <50 <50 NA NA 2/21102 <1,000[3] 22,000 <100[3] <100[3] <100[3] <100[3] <100[3] NA NA MW-9 6128101 <200 <2 3.7 <2 <2 17 <2 <3,000 NA 9114101 <200 <2 3.0 <2 <2 13 <2 NA NA 12/14/01 <5.0 <0.50 2.3 <0.50 <0.50 14 <0.50 NA NA 2121/02 <5.0 <0.50 3.1 <0.50 <0.50 17 <0.50 NA NA MW-10 6/28/01 <200 260 <2 <2 <2 4.5 <2 <3,000 NA 9114/01 <200 44 <2 <2 <2 <2 <2 NA NA 12/14/01 <5.0 35 1.0 <0.50 <0.50 <0.50 <0.50 NA NA 2121102 <5.0 27 <0.50 <0.50 <0.50 0.73 <0.50 NA NA ug/L=micrograms per liter. TAME=Tertiary amyl methyl ether. BA=Tertiary butyl alcohol 1,2-DCA=1,2-Dichloroethane MTBE=Methyl tertiary butyl ether. EDB=Ethylene dibromide DWE=Di-isopropyl ether. [E]This sample was analyzed outside of EPA recommended hold time. ETBE=Ethyl tertiary butyl ether. [2]The value reported exceeds the calibration curve but not the linear range. Below detection limit for analytical methods used. [3]The reporting limits for this sample have been raised due to the high level of a target compound. NA=Not Analyzed [4]The reporting limits for this sample have been raised due to the high levels of non-target inlerferents. USEPA=U.S.Environmental Protection Agency. Arco 5469_Quarterly_Data.X1S Delta 3 of 3