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I <br /> 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 Groundwater TPHg Benzene Toluene benzene Xylenes Observations <br /> MW-4 <br /> MW-4 01/20/93 12 34 44 35 -32 01 IS IS IS IS IS No FP, No S, Yes 0 <br /> MW-4 01/26/93 12 34 43 99 -31 65 IS IS IS IS IS No FP, No S, Yes 0 <br /> 14W-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-4(59) 06/10/93 12 34 40 68 -28 34 110,000 9,100 17,000 2,700 13,000 No FP, No S, Yes 0 <br /> MW-5 <br /> HW-5 01/20/93 9 28 41 12 -31 84 IS IS IS IS NS No FP, No S, Yes 0 <br /> MW-5 01/26/93 9 28 40 77 -31 49 IS IS IS IS NS No FP, No S, Yes 0 <br /> MW-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 /> MW-5(55) 06/10/93 9 28 37 34 -28 06 37,000 6,400 4,100 870 3,800 No FP, No S, Yes 0 <br /> * = Data collected by Emcon Associates <br /> Analytical results to 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 /> < = Below detection limit for analytical methods used <br /> Sample designations <br /> IS = Not sampled <br /> MW-4(34) well ID and sample depth (feet) <br /> W-24-MW3R - Water sample, sample depth (feet), R = rinsate blank <br /> 0712ccar <br /> 31009-9 <br />