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I <br /> TABLE 1 <br /> GROUNDWATER MONITORING DATA <br /> ARCO Service Station No 6020 <br /> 1711 Yosemite Avenue, Manteca, California <br /> (2 of 2) <br /> Static <br /> Well/Sample Elevation of Water Elevation Ethyl- Total <br /> Number Date Top of Casing Level of Water TPHg Benzene Toluene benzene Xylenes Observations <br /> MW-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 /> MW-4 04/02/93 42 09 20 00 22 09 NA NA NA NA NA No FP, No S <br /> MW-4(34) 04/20/93 42 09 20 04 22 05 <50 <0 5 <0 5 <0 5 <0 5 No FP, No S <br /> MW-4 D5/24/93 42 09 19 82 22 27 NA NA NA NA NA No FP, No S <br /> MW-4 06/15/93 42 09 19 17 22 92 NA NA NA NA NA No FP, No S <br /> MW-4(34) 08/18/93 42.09 20 30 21 79 <5D <0 5 <0 5 <0 5 <0 5 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 /> TPHg = 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) - Well ID and sample depth (feet) <br /> W-24-MW3R - Water sample, sample depth (feet), R = rinsate blank <br />