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TABLE 2 FUEL OXYGENATES ANALYTICAL DATA iARCO Service Station No. 548 1612 Hammer Lane, Stockton,California Well TBA MtBE DIPE ETBE TAME 1,2-DCA Ethanol Number Date m L mg1L m L rn9fL m L rn91L m L VW-5S 3/12/2002 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 NA 9/9/2002 <5 <0.5 <0.5 <0.5 <0.5 <0.5 NA 1214/2002 <20 <0.5 <0.5 <0.5 <0.5 <0.5 NA 3/3/2003 <20 <0.5 <0.5 <0.5 <0.5 <0.5 <100(a) 6/3/2003 <20 <0.50 <1.0 <1.0 <1.0 <0.50 <100 VW-5D 12/13/2001 <50[3] 67[3] <5A[3] <5.0[3] <5.0[3] 83[3] NA 3/12/2002 890 <2.5[3] <2.5[3] <2.5[3] <2.5[3] <2.5[3] NA 9/9/2002 290 <5 <5 <5 <5 <5 NA 12/4/2002 <4,000 <100 <100 <100 <100 <100 NA 3/3/2003 <200 <5 <5 <5 <5 <5 <1000(a) 6/3/2003 <40 0.0 <2.0 <2.0 <2.0 <1.0 <200 Notes- mg/L=micrograms per liter. TBA=Tert butyl alcohol. Oxygenates analyzed by US EPA Method 8260. MtBE=Methyl tert-butyl ether. <=Below detection limit for analytical methods used. DIPE=Di-isopropyl ether. NA=not analyzed. ETBE=Ethyl tert butyl ether. [1]This sample was analyzed outside EPA recommended holding time. TAME=Tert 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 UNP=Unpreserved this batch,this should be considered in evaluating the data for its intended purpose. [31 The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits- [4i The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits. Beginning third quarter 2002,the data quality analyses are presented in the text. (a)5/23103 Revised analytical report replaces the 3126/03 report to correct the reporting limit for Ethanol from 40mg/L to 100 mg/L. I K:1Wprocessh.l5 BP ARC01005481Quarterly10548 OMR 2Q03 3 of 3