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TABLE 1 <br /> GROUNDWATER MONITORING DATA <br /> ARCO Service Station No 2168 <br /> 441 Charter Way <br /> Stockton, California <br /> Page 2 of 2 <br /> Well/ Static <br /> Sample Elevation of Water Elevation of Ethyl- Total <br /> Number Date Top of Casing Level Ground Water TPHg Benzene Toluene benzene Xylenes Observations <br /> MW-4 <br /> W-43-MW4 01/20/93 12 34 44 35 -32 01 NS NS NS NS NS No FP, No S, Yes 0 <br /> W-43-MW4 01/26/93 12 34 43 99 -31 65 81,000 5,600 16,000 2,700 14,000 No FP, No S, Yes 0 <br /> MW-4 02/23/93 12 34 42 96 -30 62 NS NS NS NS NS NS <br /> MW-4(59) 03/10/93 12 34 42 42 -30 08 110,000 14,000 24,000 3,200 15,000 No FP, No S, Yes 0 <br /> MW-5 <br /> W-40-MW5 01/20/93 9 28 41 12 -31 84 NS NS NS NS NS No FP, No S, Yes 0 <br /> W-40-MW5 01/26/93 9 28 40 77 -31.49 43,000 7,700 4,600 <0 5 3,900 No FP, No S, Yes 0 <br /> MW-5 02/23/93 9 28 39 68 -30.40 NS NS NS NS NS NS <br /> NW-5(55) 03/10/93 9 28 39 11 -29.83 49,000 9,200 6,600 830 4,200 No FP, No S, Yes 0 <br /> ' = Data collected by Emcon Associates <br /> Analytical results in parts per billion (ppb) <br /> TPHg = Total petroleum hydrocarbons as gasoline <br /> Measurements in feet <br /> Elevation datum is mean sea level <br /> S = Sheen <br /> 0 = Obvious product odor <br /> FP = Free product <br /> < = Betow detection limit for analytical methods used <br /> Sample designations <br /> NM = Not measured <br /> NS W Not Sampled <br /> NW-4(34) - Well ID and sample depth (feet) <br /> W-24-MW3R - Water sample, sample depth (feet), R = rinsate blank <br /> f <br /> 0209ccer <br /> 31009-7 <br />