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TABLE 1 GROUNDWATER ELEVATION AND ANALYTICAL DATA ARCO Service Station No.548 1612 Hammer Lane,Stockton,California Well Elevation Static Top Elevation Groundwater Ethyl- Total Sample of Top Water of of Flow TPHg Benzene Toluene benzene Xylenes MtBE[1] Number Date of CasingLevel Screen Groundwater Direction pgA µgA µglt 1O µg/1 µg/1 Observations VW-51) 3/12/2002 [NP] NM 25.65 E 1,400[3] <5.0 8.0 <5.0 96 <2.5[2][5] No FP,No S,No 0 (cont) 6/17/2002 [NP] NM 27.67 -- E 3,300 12 40.0 36 1,200 <2.5[2] No FP,No S,No O 9/9/2002 NP NM 29.39 NE 3,100 <5 <5 <5 870 <5 No FP,No S,No 0 12/4/2002 NP NM 29.65 NE <10,000 <100 <100 220 3200 <100 No FP,No S,No O Analytical results in micrograms per liter. P=Purge. TPHg-Total petroleum hydrocarbons as gasoline. NP=No purge. MtBE-Methyl tert-butyl ether. <-Below detection limits used by laboratory. Elevation datum is mean sea level. Measurements in feet. Sample designations: NA-Not analyzed. MW-4(34)-Well ID and sample depth(feet). NM-Not measured. FP-Free product. NE-Not evaluated. S- Sheen. #-Bailer blank, O-Obvious product odor. *-Raised MRL due to matrix interference. ** The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline;the chromatogram does not match the typical gasoline fingerprint. ***-Raised MRL due to high analyte concentration requiring sample dilution. [1]MTBE was analyzed using USEPA Method 8020. [2]MTBE was analyzed using USEPA Method 8260. [3]Hydrocarbon pattern is present in the requested fuel quantitation range,but does not resemble the pattern of the requested fuel. [4]The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits, [5]The sample was diluted due to the presence of high Ievels of non-target analytes resulting in elevated reporting limits. 0548 QMR4Q02 10 of 10