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• TABLE 2 GROUNDWATER MONITORING DATA ARCO Service Station No. 0548 1612 Hammer Lane Stockton, California . (Page 2 of 2) Well/ Static Sample Elevation of Water Elevation of Ethyl- Total Number Date Top of Casing Level Ground Water TPHg Benzene Toluene benzene Xylenes Observations MW-4 W-25-MW4 10/30/91 11.57 50.45 -38.88 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, No 0 MW-4(63) 03/18/92 11.57 47.24 -35.67 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, No 0 MW-4(63) D6/10/92 11.57 48.94 -37.37 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, No 0 MW-4(64) 09/04/92 11.57 50.65 -39.08 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, Yes 0 MW-4(64) 12/04/92 11.57 49.73 -38.16 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, Yes 0 MW-4(63) 03/04/93 11.57 46.89 -35.32 <50 <0.5 <0.5 <0.5 <0.5 No FP, No S, Yes 0 MW-5 W-44-MW5 03/29/93 9.37 44.25 -34.88 930 16 <0.5 1.9 9.7 No FP, No S, Yes 0 Analytical results in parts per billion (ppb) TPHg = Total petroleum hydrocarbons as gasoline Elevation datum is mean sea level Measurements in feet NS a Not sampled NX a Not measured * = This well was paved over on 03/04/93. Emcon returned on 03/10/93, and was instructed by RESNA personnel not to sample the well due to construction activities. ** = Raised MRL due to matrix interference. **+ = The sample contains a lower boiling point hydrocarbon mixture quantitated as gasoline. The chromatogram does not match the typical gasoline fingerprints. < = Below detection limit for analytical methods used # = Bailer blank FP = Free product S = Sheen 0 = Obvious product odor Sample designations: MW-4(34) - Well ID and sample depth (feet) W-24-MW3R - Water sample, sample depth (feet), R = rinsate blank* = Raised MRL due to high analyze concentration requiring sample dilution. 0331ccar 30004-8