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<br /> TABLE 1
<br /> GROUNDWATER MONITORING DATA
<br /> Former ARCO Service Station No. 548
<br /> 1612 Hammer Lane, Stockton, California
<br /> Well Elevation Static Top Elevation Groundwater
<br /> Sample of Top Water of of Flow Ethyl- Total
<br /> Number Date of Casing Level Screen Groundwater Direction TPHG Benzene Toluene benzene Xylenes MTBE [ll Observations
<br /> MW-4 (63) 2/15/95 11.57 42.12 44.00 -30.55 E <50 <0.5 <0.5 <0.5 <0.5 NA No FP,No S,No O
<br /> (63) 5/12/95 11.57 40.28 -28.71 E <50 <0.5 <0.5 <0.5 <0.5 NA No FP,No S,No O
<br /> (63) 8/29/95 11.57 41.72 -30.15 E <50 <0.5 <0.5 <0.5 <0.5 NA No FP,No S,No O
<br /> (63) 12/4195 11.57 40.44 -28.87 E <50 <0.5 <0.5 <0.5 <0.5 NA No FP,No S,No O
<br /> 2/2/96 11.57 38.54 -26.97 E <50 <0.5 <0.5 <0.5 <0.5 NA No FP,No S,No O
<br /> (63) 5/10/96 11.57 36.02 -24.45 E <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S,No O
<br /> (63) 8/29/96 11.57 37.60 -26.03 E <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S,No O
<br /> (63) 11/20/96 11.57 36.71 -25.14 E <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S,No O
<br /> (63) 3/19/97 11.57 33.08 -21.51 E-SE <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S,No O
<br /> 5/27/97 11.57 33.21 -21.64 E-SE <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S,No O
<br /> (62) 8/12/97 11.57 34.45 -22.88 E <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S,No O
<br /> (64) 11/18/97 11.57 34.31 -22.74 E <50 4.5 2.5 0.91 2.1 <5 No FP,No S,No O
<br /> (63.8) 2/16/98 11.57 31.17 -19.60 SE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S,No O
<br /> (62) 6/23/98 [P] 11.57 28.52 -16.95 SE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S,No O
<br /> (62) 9/29/98 [P] 11.57 30.13 -18.56 E <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S,No O
<br /> 12/30/98 11.57 NM -- SE -----------------------Well inaccessible--------------------------
<br /> (62) 3/31/99 [P] 11.57 26.69 -15.12 E-SE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S,No O
<br /> (62) 6/28/99 [P] 11.57 27.66 -16.09 SE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S,No O
<br /> (62) 9/10199 [P] 11.57 29.54 -17.97 E <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S,No O
<br /> (62) 12/13/99 [P] 11.57 28.80 -17.23 E <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S,No O
<br /> (62) 3128100 [P] 11.57 25.71 -14.14 SE <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S,No O
<br /> (63) 6/26/00 [P] 11.57 26.53 -14.96 E <50 <0.5 <0.5 <0.5 <0.5 <2.0[21 No FP,No S,No O
<br /> 9/28/00 [P] 11.57 28.94 -17.37 E-NE <50 <0.5 <0.5 <0.5 <0.5 <2.5 No FP,No S,No O
<br /> 12/18/00 [P] 11.57 27.75 -16.18 E <50 <0.5 <0.5 <0.5 <0.5 <2[21 No FP,No S,No O
<br /> 3114101 [P] 11.57 26.42 -14.85 E <50 <0.5 <0.5 <0.5 <0.5 <1.0 No FP,No S,No O
<br /> 6/19/01 [P] 11.57 27.26 -15.69 E <50 <0.5 <0.5 <0.5 <0.5 <2[2] No FP,No S,No O
<br /> 9/11/01 [P] 11,57 29.65 -18.08 E <50 <0.5 <0.5 <0.5 <0.5 <2[2] No FP,No S,No O
<br /> Arco_0548_Quarterly_Da1a.XLS Delta
<br /> 4of10
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