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TABLE 2 • GROUNDWATER ANALYTICAL RESULTS FOR OXYGENATES AND ADDITIONAL COMPOUNDS Former ARCO Service Station No. 548 1612 Hammer Lane, Stockton, California Well TBA MTBE DIPE ETRE TAME 1,2-DCA Number Date µ /L µ /L µ /I µg/L µ91I, pg/I, MW-6 6/26/00 <100 14 <2 <2 <2 NA 9/28/00 <200 3.98 <2 <2 <2 29.2 12/18/00[l] <200 <2 <2 <2 <2 NA 3/14/01 <20 2.12 <1.0 <1.0 <1.0 28.8 6/19/01 <100 7.2 <2 <2 <2 17 9/11/01 <100 6.8 <2 <2 <2 14[2] 12/13/01 <5.0 21 <0.50 <0.50 <0.50 4.4 3/12/02 <5.0 0.53 <0.50 <0.50 <0.50 7.6. VW-1 12/13/01 22 87 <0.50 <0.50 <0.50 4.5 3/12/02 <5.0 0.68 <0.50 <0.50 <0.50 2.7 VW-2 12/13/01 32 1.5 <0.50 <0.50 <0.50 28 3/12/02 <5.0 <0.50 <0.50 <0.50 <0.50 0.80 VW-3 12/13/01 59 16 <0.50 <0.50 <0.50 8.2 3/12/02 <5.0 0.72 <0.50 <0.50 <0.50 2.5. VW-4 12/13/01 <5.0 100 <0.50 <0.50 <0.50 12 3/12/02 <5.0 32 <0.50 <0.50 <0.50 5.3 VW-5S 3/12/02 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 VW-5D 12/13/01 <50[3]. 67[3] <5.0[3] <5.0[3] <5.0[3] 83[3] 3/12/02 890 <2.5[3] <2.5[3] <2.5[3] <2.5[3] <2.5[3] µg/L=micrograms per 1 iter. TBA=Tertiary butyl alcohol. Oxygenates analyzed by US EPA Method 8260. MTBE=Methyl tertiary butyl ether. <=Below detection limit for analytical methods used. DIPE=Di-isopropyl ether. NA=not analyzed. ETBE=Ethyl tertiary butyl ether. [1]This sample was analyzed outside EPA recommended holding time. TAME=Tertiary amyl methyl ether. [2] The opening calibration verification standard was outside acceptance 1,2-DCA=1,2-Dichloroethane limits by<3%. Although the Lab Control Sample verified the accuracy of this batch,this should be considered in evaluating the data for its intended purpose. [3]The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits. [4]The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits. I I I Arco_0548_QuaRerly_Data.XLS 2 Of 2 Delta