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TABLE 1 <br /> GROUND-WATER MONITORING DATA <br /> ARCO Service Station No. 0548 <br /> 1612 Hammer Lane <br /> Stockton, California <br /> Welt/ Static <br /> Sample Elevation of Water Elevation of Ethyl- Total <br /> Humber Date Top of Casing Level Ground Water TPHg Benzene Toluene benzene Xylenes Observations <br /> N11-1 <br /> W-49-MW1 10/30/91 10.36 49.58 -39.22 <50 2.1 <0.50 <0.50 0.96 No FP, No S, No 0 <br /> W-49-MW1# 10/30/91 NM NM NM <50 <0.50 <0.50 <0.50 <0.50 NS <br /> MW-1((56) 03/18/92 10.36 46.30 -35.94 130 18 0.50 <0.50 1.7 No FP, No S, No 0 <br /> MW-1(56) 06/10/92 10.36 48.10 -37.74 <50 1.0 <0.50 <0.50 <0.50 No FP, No S, No 0 <br /> MW-1(56) 09/04/92 10.36 49.85 -39.49 260 8.7 <1* <1* <1* No FP, No S, Yes 0 <br /> MW-2 <br /> W-49-MW2 10/30/91 9.82 49.10 -39.28 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, No 0 <br /> MW-2(61) 03/18/92 9.82 48.81 -35.99 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, No 0 <br /> MW-2(61) 06/10/92 9.82 47.57 -37.75 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, No 0 <br /> MW-2(60) 09/04/92 9.82 49.36 -39.54 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, Yes 0 <br /> MW-3 <br /> W-49-MW3 10/30/91 9.95 49.00 -39.05 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, No 0 <br /> MW-3(62) 03/18/92 9.95 45.78 -35.83 <50 <0.50 4.50 <0.50 <0.50 No FP, No S, No 0 <br /> MW-3(62) 06/10/92 9.95 47.47 -37.52 60 <0.50 <0.50 <0.50 <0.50 No FP, No S, No 0 <br /> MW-3(62) 09/04/92 9.95 49.22 -39.27 <73** <0.50 <0.50 <0.50 <0.50 No FP, No S, Yes 0 <br /> MW-4 <br /> 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 <br /> 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 <br /> MW-4(63) 06/10/92 11.57 48.94 -37.37 <50 <0.50 <0.50 <0.50 <0.50 No FP, No S, No 0 <br /> 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 <br /> Analytical results in parts per billion (ppb) # = Bailer blank <br /> Elevation datum is mean sea level Measurements in feet <br /> NS = Not sampled NM = Not measured <br /> < = Below detection limit for analytical methods used TPHg = Total petroleum hydrocarbons as gasoline <br /> FP = Free product S = Sheen <br /> 0 = Obvious product odor <br /> * = Raised MRL due to high analyze concentration requiring sample dilution. <br /> ** = Raised MRL due to matrix interference. This sample contains single non-fuel component. <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 /> 1030ccar <br /> 30004-6 <br />