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TABLE 1 GROUNDWATER MONITORING DATA ARCO Service Station No. 548 1612 Hamner Lane, Stockton,California Well Elevation Static Top Elevation Groundwater Sample of Top Water of of Flow Ethyl- Total Number Date of Casing Level Screen Groundwater Direction TPHG Benzene Toluene benzene Xylenes MTBE [1] Observations VW-513 12/30/98 NM Well not located Inaccessible because of soil stockpiles 03/31/99 NM 25.65 -- E-SE Not scheduled for sampling No FP,Yes S,Yes O 06/28/99 NM 26.74 -- SE Not scheduled for sampling No FP,No S,No O 09/10/99 NM 29.00 -- E Not scheduled for sampling No FP,No S,No O 12/13/99 NM 28.20 -- E Not scheduled for sampling No FP,No S,No O 03/28/00 NM 24.97 -- SE Not scheduled for sampling No FP,No S,No O 06/26/00 NM 29.81 -- E Not scheduled for sampling No FP,No S,No O 09/28/00 NM 28.31 -- E-NE Not scheduled for sampling No FP,No S,No O 12/18/00 NM -- -- E Not scheduled for sampling Yes FP,Yes S,Yes O 03/14/01 NM 25.00 -- E Not scheduled for sampling Yes FP Analytical results in micrograms per liter. P=Purge. TPHG-Total petroleum hydrocarbons as gasoline. NP=No purge. MTBE-Methyl tertiary butyl ether. <-Below detection limits used by laboratory. Elevation datum is mean sea level. [1]MTBE was analyzed using USEPA Method 8020. Measurements in feet. [2] MTBE was analyzed using USEPA Method 8260. NA-Not analyzed. Sample designations: NM-Not measured. MW-4(34)-Well ID and sample depth(feet). NE-Not evaluated. FP-Free product. f#-Bailer blank. S- Sheen. 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. C:1ARC0105481QTRLY1200010548 Quarterly Data.XLS Delta 10 of 10 1/3aro1