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n 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 Casing Level Screen Groundwater Direction pg/L p /L Mg/L AIL 1vg/L pg/L Observations ' VW-5D 9/10/1999 NM 29.00 -- E Not scheduled for sampling No FP, No S, No O (cont) 12/13/1999 NM 28.20 -- E Not scheduled for sampling No FP, No S, No O 3/28/2000 NM 24.97 SE Not scheduled for sampling No FP, No S, No O 6/26/2000 NM 29.81 E Not scheduled for sampling No FP, No S, No O 9/28/2000 NM 28.31 -- E-NE Not scheduled for sampling No FP, No S, No O 12/18/2000 NM -- -- E Not scheduled for sampling Yes FP, Yes S, Yes O 3/14/2001 NM 25.00 -- E Not scheduled for sampling Yes FP 6/19/2001 NM 24.95 - E Not scheduled for sampling No FP, No S, Yes O 9/11/2001 NM 28.00 E Not scheduled for sampling No FP, No S, Yes O 12/13/2001 [NP] NM 28.42 -- E-NE 54,000 840 2,300 1,100 17,000 67[2] No FP, No S, No O 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 O 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 O 12/4/2002 NP NM 29.65 - NE 3,200 <100 <100 220 3200 <100 No FP, No S, No O 3/3/2003 NP NM 27.48 — SE 1,400 7.0 11 23 480 <5.0 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 tent-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. [41 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 levels of non-target analytes resulting In elevated reporting limits. K:1W processW5 BP AR=05481Quanerly 1 QTR 0=548 GWMR 1003 10 of 10