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<br /> Groundwater (Monitoring Data Page 1 of 2
<br /> ARCO Service Station No. 2186
<br /> 3212 North California Street
<br /> Stockton, California
<br /> well EIevation of Static Water[1] Top of Elevation of Total
<br /> Sample No. Date T22 of Casing Level Screen[2] Groundwater TPHG Benzene Toluene Eth lbenzene Xylenes MTBE Observations
<br /> MW-1 09/25/95 14.65 58.05 45.60 43.40 20,000 780 2,000 690 4,100 No FP,No S
<br /> 10/23/95 14.65 57.89 43.24 20,000 590 1,100 600 3,600 No FP,No S
<br /> 12122/95 14.65 53.78 -39.13 730 3.5 <1 [2] 13 13 No FP,No S
<br /> 02/16/96 14.65 50.13 -35.48 1,200 22 <1 [2] 51 24 No FP,No S
<br /> 05/23/96 14.65 45.35 -30.70 760 9 1 22 5 <5 No FP,No S
<br /> 09/19/96 14.65 53.63 -38.98 10,000 480 570 520 700 <50* No FP,No S
<br /> 11/27/96 14.65 50.77 -36.12 19,000 700 1,800 820 2,200 <100* No FP,No S
<br /> 03/21/97 14.65 42.06 -27.41 5,300 26Q 210 200 440 <30* No FP,No S
<br /> 05/22/97 14.65 43.89 -29.24 25,000 920 1,900 1,400 3,500 <120* No FP,No S
<br /> 08/20/97 14.65 49.83 -35.18 31,000 1,000 2,800 1,300 4,000 <500** No FP,No S
<br /> 11/20/97 14.65 49.07 -34.42 24,000 830 1,900 1,100 3,600 <1,000**[3]; No FP,No S
<br /> MW-2 09/25/95 15.49 59.01 55.50 -43.52 <50 <0.5 <0.5 <0.5 2.0 No FP,No S
<br /> 10/23/95 15.49 NM NM NA NA NA NA NA NM
<br /> 12/22/95 15.49 54.76 -39.27 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S
<br /> 02/16/96 15.49 51.16 -35.67 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S
<br /> 05/23/96 15.49 46.28 -30.79 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S
<br /> 09/19/96 15.49 54.53 -39.04 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S
<br /> 11/27/96 15.49 51.67 -36.18 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S
<br /> 03/21/97 15.49 43.16 -27.67 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S
<br /> 05/22/97 15.49 44.81 -29.32 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S
<br /> 08/20/97 15.49 50.71 -35.22 <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S
<br /> 11/20/97 15.49 50.17 -34.68 <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S
<br /> MW-3 09/25/95 14.55 57.90 55.30 43.35 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S
<br /> 10/23/95 14.55 NM NM NA NA NA NA NA NM
<br /> 12/22/95 14.55 53.59 -39.04 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S
<br /> 02/16/96 14.55 49.99 -35.44 <50 <0.5 <0.5 <0.5 <0.5 No FP,No S
<br /> 05/23/96 14.55 45.19 -30.64 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S
<br /> 09/19/96 14.55 53.26 -38.71 <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S
<br /> N.\XLS 0805\1470MI1498M1.XLS EmCOA
<br /> Sheetl 2/20/98
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