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TABLE 1 Groundwater Monitoring Data ARCO Service Station No 2186 3212 North California Street, Stockton, California Elevation of Static Water[I Screen Elevation of Total Well Top of Casing Level Interval Groundwater Groundwater TPHG Benzene Toluene Ethylbenzene Xylenes MTBE[3] Sample No Date feet msl feet b s feet b s (feet msl) Flow Direction L L L L L L Observations MW4 l U20/97 13 83 48 36 45-65 -3453 E 89 10 I l 063 20 11 No FP,No S 2/17198 43 55 -2972 ESE 180 057 <0 5 <0 5 059 29 No FP,No S 6/24/98 3506 -2123 E <50 <0 5 <0 5 <0 5 <0 5 162 No FP,No S 9121198 3867 -2484 ENE 131 <0 5 <0 5 l 15 167 262 No FP,No S 12/14/98 3661 -2278 ENE 136 1 08 <0 5 <0 5 <0 5 29 l No FP,No S 3/31/99 33 85 -2002 NNE <50 <0 5 <0 5 <0 5 <0 5 796 No FP,No S 6/11/99 3347 -1904 E-NE 194 <0 5 <0 5 <0 5 <0 5 41 No FP,No S 9110/99 3772 -23 89 ENE 213 148 <0 5 <0 5 <0 5 1 t00 No FP,No S 12/3199 3764 -2381 E 64 1 <0 5 <0 5 <0 5 <0 5 731 No FP,No S 413100 3430 -2047 NE <50 <0 5 <0 5 <0 5 <0 5 166 No FP,No S 6122/00 3437 -2054 E 232 <2 0 <2 0 <2 0 <2 0 2,070[4] No FP,No S 9127100 3980 -2597 E-NE 185 1 60 <0 5 0 542 t 17 6 590[4] No FP,No S 10/19/00 3959 -2576 ENE NA NA NA NA NA NA 12/20/00 3768 -23 85 E NE <50 <0 5 <0 5 <0 5 <0 5 1,170 No FP,No S 3/16/01 3650 -2267 ENE <50 <0 5 <0 5 <0 5 <0 5 481[41 No FP,No S 6121/01 3937 -25 54 NE <50 <0 5 <0 5 <0 5 <0 5 590[4] No FP,No S 9/13/01 45 12 -3129 ENE 150 <0 5 <0 5 <0 5 <0 5 7,600[41 No FP,No S 12/11/01 4243 -2860 NE 84[71 <0 50 <0 50 <0 50 <0 50 5,600[4] No FP,No S 3114/02 3926 -2543 ENE 88[71 <0 50 <0 50 <0 50 <0 50 4,900[4] No FP,No S 6119102 4146 -2763 E-NE 540[7] <0 50 <0 50 <0 50 <0 50 2,900[4] No FP,No S MW-5 9113/01 1276 45 13 -3237 E-NE <50 <0 5 <0 5 <0 5 <0 5 <2 0[4] No FP,No S 12/11/01 4180 -2904 NE <50 <0 50 <0 50 <0 50 <0 50 <2 0[4] No FP,No S 3114/02 3870 -2594 E-NE <50 <0 50 <0 50 <0 50 <0 50 <0 50[41 No FP No S 6119/02 41 57 -2881 E-NE <50 <0 50 <0 50 <0 50 <0 50 <0 50[41 No FP,No S MW-6 9/13/01 13 82 4576 -3194 E-NE <50[6] <0 5[6] <0 5[6] <0 5[61 <0 5[61 <2 0[4][61 No FP,No S 12/11/01 4264 2892 NE <50 <0 50 <0 50 <0 50 <0 50 <2 0[41 No FP,No S 3/14/02 39 55 2573 E-NE <50 <0 50 <0 50 <0 50 <0 50 <0 50[4] No FP,No S 6/19/02 42 17 -2835 E-NE <50 <0 50 <0 50 <0 50 <0 50 <0 50[4] No FP,No S MW 7 9/13/01 13 97 45 10 -31 13 E-NE <50[6] <0 5[6] <0 5[6] <0 5[61 <0 5[6] <2 0[4][6] No FP,No S 12/11/01 4237 -2840 NE <50 <0 50 <0 50 <0 50 <0 50 <2 0(4) No FP,No S 3/14102 3933 -25 36 E-NE <50 <0 50 <0 50 <0 50 <0 50 <0 50[4] No FP,No S 6119/02 4169 2772 E-NE <50 <0 50 <0 50 <0 50 <0 50 <0 50[4] No FP,No S AR(A_2186_Quanaly_Dam XtS 4 of 7