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TABLE 1 <br /> GROUNDWATER MONITORING DATA <br /> ARCO Service Station 0548 <br /> 1612 Hammer Lane <br /> Stockton, California <br /> (Page 2 of 2) <br /> Well/ Static <br /> Sample Elevation of Water Elevation of Ethyl- Total <br /> Number Date Tap of Casing Level Groundwater TPHg Benzene Toluene benzene Xylenes TOG Observations <br /> MW-4 <br /> W-25-MW4 10/30/91 11.57 50.45 -38.88 60 <0.50 <0.50 <0.50 <0.50 NA No FP, No S, No 0 <br /> MW-4(63) 03/18/92 11.57 47.24 -35.67 <50 <0.50 <0.50 <0.50 <0.50 NA No FP, No S, No 0 <br /> MW-4(63) 06/10/92 11.57 48.94 -37.37 <50 <0.50 <0.50 <0.50 <0.50 NA No FP, No' S, No,O <br /> MW-4(64) 09/04/92 11.57 50.65 -39.08 <br /> <50 <0.50 <0.50 <0.50 <0.50 NA No FP, No S, Yes 0 <br /> MW-4(64) 12/04/92 11.57 49.73 -38.16 <50 <0.50 <0.50 <0.50 <0.50 NA No FP, No S, Yes 0 <br /> MW-4(63) 03/04/93 11.57 46.89 -35-32 <50 <0.5 <0.5 <0.5 <0.5 NA No FP, No S, Yes 0 <br /> MW-4(63) 06/07/93 11.57 45.22 -33.65 <50 <0.5 <0.5 <0.5 <0.5 NA No FP, No S, No 0 <br /> MW-4(63) 09/02/93 11.57 46.96 -35.39 <50 <0.5 <0.5 <0.5 <0.5 NA No FP, No S, No 0 <br /> MW-4{63} 12/16/93 11.57 44.88 -33.31 <br /> <50 <0.5 <0.5 <0.5 <0.5 NA No FP, No S, No 0 <br /> MW-5 <br /> W-44-MW5 03/29/93 9.37 44.25 -34.88 930 16 <0.5 1.9 9.7 NA No FP, No S, Yes 0 <br /> MW-5(61) 06/07/93 9.37 43.38 -34.01 1,100 40 1.4 42 58 NA No FP, No S, Yes 0 <br /> MW-5(60) 09/02/93 9.37 45.32 -35.95 1,200 76 1.7 52 57 NA No FP, No S, Yes 0 <br /> MW-5(60) 12/16/93 9.37 43.03 -33.66 820 34 1.4 39 41 NA No FP, No S, Yes 0 <br /> MW- <0.5 <0.5 <0.5 NA No FP, No S, No 0 <br /> MW-6((55 8) 12/16/93 8.95 42.77 -33.82 <50 <0.5 , <br /> Analytical results in parts per billion (ppb) <br /> TPHg = Total petroleum hydrocarbons as gasoline <br /> TOG = Total oil grease <br /> Elevation datum is mean sea level <br /> Measurements in feet <br /> NS = Not sampled, NM = Not measured <br /> = Well paved over on 03/04/93. <br /> �* = Raised MRL due to matrix interference. <br /> *� = The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline; the chromatogram does not match the typical gasoline <br /> fingerprints. <br /> < = Below detection limit for analytical methods used <br /> # = Bailer blank <br /> FP = Free product, S = Sheen, 0 = obvious product odor <br /> Sample designations: <br /> MW-4(34) - Well ID and sample depth (feet) <br /> W-24-MW3R Water sample, sample depth (feet), R = rinsate blank" = Raised MRL due to high analyze concentration requiring sample dilution. <br /> 1213ccar/30004-8 <br />