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<br /> TABLE 4
<br /> GROUNDWATER MONITORING DATA
<br /> ARCO Service Station 2168
<br /> 441 Charter way, 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 /> NW-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 /> 14W-4(59) 06/10/93 12 34 40 68 -28 34 110,000 9,100 17,000 2,700 13,000 Na FP, No S, Yes 0
<br /> MW-4(59) 09/02/93 12 34 41 59 -29 25 110,000 12,000 21,000 2,700 13,000 No,FP, No S, Yes 0
<br /> MW-4(59) 10/28/93 12 34 41 78 -29 44 90,000 11,000 20,000 2,700 13,000 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 /> 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 /> MW-5(55) 09/02/93 9 28 38 23 -28 95 51,000 7,900 6,600 990 4,800 No FP, No S, Yes 0
<br /> MW-5(55) 10/28/93 9 28 38 46 -29 18 60,000 9,200 9,000 1,200 6,700 No FP, No S, Yes 0
<br /> NW-6
<br /> MW-6(47) 10/28/93 8 93 37 08 -28 15 93,000 15,000 20,000 1,600 11,000 No FP, Yes S, Yes 0
<br /> MW-7
<br /> MW-7(48) 10/28/93 8 88 38 11 -29 23 42,000 3,100 9,300 970 6,000 No FP, No S, Yes 0
<br /> t = 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 /> NM = Not measured, NS = 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 /> 31009-10
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