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Table 1 • Groundwater Monitoring Data ARCO Service Station No. 2186 Page 2 of 4 3212 North California Street Stockton, California Well Elevation of Static Water[1] Top of Elevation of Groundwater Total Sample No. Date Top of Casing Level Screen 2 Groundwater Flow Direction TPHG Benzene Toluene Eth lbenzene Xylenes MTBE[31 Observations MW-2 05/22/97 15.49 44.81 -29.32 E-NE <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S MW-2 08/20/97 .15.49 . 50.71 -35.22 E-NE <50 <0.5 <0.5 <0.5 <03 <5 No FP,No S MW-2 11/20/97 15.49 50.17 -34.68 E <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-2 02/17/98 15.49 45.30 -29.81 E-SE <50, <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW_2 06/24/98 15.49 36.69 -21.20 E <50 <0.5 <0.5 <0.5 ', <0.5 <5 No FP,No S MW-2 09/21/98 15.49 40.31 -24.82 E-NE <50: <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-2 12/14/98 15.49 38.28 -22.79 E-NE <50 <0.5 <0.5 <0.5 . <0.5 <5 No FP,No S MW-2 03/31/99 15.49 35.24 -19.75 N-NE <50 <0.5 0.781 <0.5 'i <0.5 <5 No FP,No S MW-2 06/11/99 15.49 35.14 -19.65 E-NE <50 <0.5 <0.5 <0.5 0.796 <5 No FP,No S MW-2 09/10/99 15.49 39.37 -23.88 E-NE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-2 12/03/99 15.49 39.33 -23.84 E <50 <0.5 <0.5 <0.5 <0.5. <2.5 No FP,No S MW-3 09/25/95' 14.55 57.90 55.30 -43.35 SE <50 <0.5 <0.5 <0.5 <0.5 No FP,No S MW-3 10/23/95 14.55 NM NM --- NA NA NA NA NA NM MW-3 12/22195 14.55 53.59 -39.04 E <50 <0.5 <0.5 <0.5 <0.5 No FP,No S MW-3 02/16/96 14.55 49:99 -35.44 E <50 <0.5 <0.5 <0.5 <0.5 No FP,No S MW-3 05/23/96 14.55 45.19 . -30.64 E <50 <0.5 <0.5 <0.5 +. <0.5 <3 No FP,No S MW-3 09/19/96 14.55 53.26 -38.71 NE <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S MW-3 11/27/96 14.55 50.51 -35.96 SE X50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S MW-3 03/21/97 14.55 41.97 -27.42 SE <50 . <0.5 <0.5 <0.5 <0.5. <3 No FP,No S MW-3 05/22/97 14.55 43.61 -29.06 E-NE <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S MW-3 08/20/97 14.55 49.43 -34.88 E-NE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-3 11/20/97 14.55 48.82 -34.27 E <50 <0.5 <0.5 <0.5 ; <0.5 <5 No FP,No S MW-3 02/17/98 14.55 44.18 -29.63 E-SE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-3 06/24/98 14-55 35.59 -21.04 E <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-3 09/21/98 .14.55 39.07 -24.52 E-NE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-3 12/14/98 14.55 37.14 -22.59 E-NE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-3 03/31/99 14.55 34.22 . -19.67 N-NE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-3 06/11/99 14.55 34.01 -19.46 E-NE <50 <0.5 <0.5 <0.5 <0.5 <5 No FP,No S MW-3 09/10/99 14.55 38.10 '-23.55 E-NE <50 . <0.5 <0.5 <0.5 i <0.5 <5 No FP,No S CPIC:\ARCHIVE\ARC0\21861QTRLWI86g499.xls IT Corporation 02/22/2000