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TABLE 1
<br /> GROUND-WATER MONITORING DATA
<br /> ARCO Service Station No 2168
<br /> 441 Charter Way
<br /> Stockton, California
<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-1
<br /> W-40-MW1 05/11/92 10 45 40 27 -29 82 60,000 5,900 1,600 430 800 No FP, No S, Yes 0
<br /> MW-1(54) 08/24/92 10 45 42 06 -31 61 14,000 4,100 330 310 490 No FP, No S, Yes 0
<br /> y MW-1(54) 12/17/92 10 45 42 79 -32 34 14,000 3,500 410 400 -800 No FP, No S,(Yes 0 T
<br /> MW-2
<br /> W-40-MW2 05/11/92 10 83 40 63 -29 80 14,000 2,100 160 <50 1,100 No FP, No S, Yes 0
<br /> MW-2(53) 08/24/92 10 83 42 44 -31 61 12,000 2,400 1,100 110 600 No FP, No S, Yes 0
<br /> MW-2(53) 12/17/92 J 10 83 4 ,18_ -32 35 13,000 2,500 1,500 190 880 / No FP, No S, Yes 0-�
<br /> MW-3
<br /> W-39-MW3 05/11/92 9 58 39 05 -29 47 65,000 13,000 3,000 1,800 8,300 No FP, No S, Yes 0
<br /> MW-3(54) 08/24/92 9 58 40 84 -31 26 77,000 15,000 9,400 2,300 2,300 No FP, No S, Yes 0
<br /> MW-3(53) 12/17/92 9 58 41 69 -32 11 67,000 12,000 5,500 2,100 7,200 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 /> < = Below detection limit for analytical methods used
<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 /> 0125ccer
<br /> 31009-6
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