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TABLE 1 <br /> GROUND-WATER MONITORING DATA <br /> ARCO Service Station No 6020 <br /> 1711 Yosemite Avenue, Manteca, California <br /> 0of1) <br /> Static <br /> Well/Sample Elevation of Water Elevation Ethyl- Total <br /> Number Date Top of Casing Level of Water TPNg Benzene Toluene benzene Xylenes Observations <br /> MW-1 <br /> W-23-MW-1 12/16/92 43 33 23 31 20 02 <50 <0 5 <0.5 <0 5 <0 5 No FP, No S <br /> MW-1(39) 02/26/93 43 33 21 89 21 44 <50 <0 5 <0 5 <0 5 <D 5 No FP, No S <br /> MW-1 03/01/93 43 33 21 85 21 48 NA NA NA NA NA No FP, No S <br /> MW-2 <br /> W-24-MW-2 12/16/92 44 36 24 35 20 01 <50 <0 5 <0 5 <0 5 <D 5 No FP, No S <br /> MW-2(38) 02/26/93 44 36 22 95 21 41 <50 <0 5 <0 5 <0 5 <0 5 No FP, No S <br /> MW-2 03/01/93 44 36 22 91 21 45 NA NA NA NA NA No FP, No S <br /> MW-3 <br /> MW-22-MW-3 12/16/92 42 84 22.66 20 18 <50 <0 5 <0 5 <0 5 <0 5 No FP, No S <br /> MW-3(36) 02/26/93 42 84 21 22 21 62 <50 <0 5 <0 5 <0 5 4 5 No FP, No S <br /> MW-3 03/01/93 42 84 21 20 21 64 NA NA NA NA NA No FP, No S <br /> Mil-4 <br /> W-21-MW-4 12/16/92 42 09 21 93 20 16 <50 <0 5 <0 5 <0 5 <0 5 No FP, No S <br /> MW-4(34) 02/26/93 42 09 20 49 21 60 <50 <0 5 <0 5 <0 5 <0 5 No FP, No S <br /> MW-4 03/01/93 42 09 20 43 21 66 NA NA NA NA NA No FP, No S <br /> * = Data before 3/10/92 collected by RESNA NS = Not sampled <br /> Analytical results in parts per billion (ppb) NM = Not measured <br /> TPNg = Total petroleum hydrocarbons as gasoline Elevation datum is Mean Sea Level <br /> Measurements in feet FP = Free product <br /> < = Below detection limit for analytical methods used S = Sheen <br /> NA = Not analyzed 0 = Obvious product odor <br /> Sample designations <br /> MW-4(34) - Welt ID and sample depth (feet) <br /> W-24-MW3R - Water sample, sample depth (feet), R = rinsate blank <br />