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TABLE 1 GROUNDWATER MONITORING DATA ARCO Service Station No 2130 7906 North El Dorado Street, Stockton, California Elevation Static Water Groundwater Ethyl- Total Well Top of Casing Top of Screen Level Elevation TPHg Benzene Toluene benzene Xylene MtBE Number Date (feet msl) (ft btc) (ft btc) ._ (feet ms]) µg/L Awl. _ 4/L µg1/, aL pg/L Observations MW-4 03/15/01 1457 35 03 -2046 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP,No S (cont) 06/20/01 1457 3833 -2376 <50 <2[4] <2 [4] <2 [4] <2 [4] <2[21 No FP,No S 09/12/01 1457 4261 -28 04 <50 <2[4] <2 [4] <2 [4] <2 [41 <2[2] No FP,No S 12/12/01 1457 3937 -2480 <50 <1 0[4] <1 0[4] <1 0[4] <1 0[4] <0 50[2] No FP,No S 03/13/02 1457 3643 -2186 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP,No S 06/18/02 1457 3870 -24 13 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP,No S 09/11/02 1457 43 86 -2929 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP,No S 12[18/02 14,57 41.08 -2651 <50 <0.50 <0.50 <0.50 <0.50 <0 50[21 No FP,No S MW-5 08/28/95 1510 5800 5461 -3951 130 27 <0 5 45 0 6 NA No FP,No S 12/07/95 1510 5320 -38 10 <200** 2 1 <0 5 0 7 <0 5 NA No FP,No S 02/05/96 1510 5067 -35 57 <200** 3 0 <0 5 0 9 <0 S NA No FP,No S 05/30/96 1510 4770 -3260 140*** 15 <0 5 52 <0 5 <4** No FP,No S 09/18/96 1510 5156 -3646 <300*** 33 <0 5 9 0 <0 5 <3 No FP,No S 11/26/96 1510 4934 -3424 <200*** 19 <0 5 05 <0 5 <4** No FP,No S 03/24/97 1510 4424 -29 14 <200*** 3 2 <05 16 3 0 <8** No FP,No S 05/20/97 15 10 44 85 -2975 270 31 5 0 5 0 15 <20** No FP,No S 08/19/97 15 10 4837 -3327 100 20 <05 3 8 <0 5 <5 No FP,No S 11/19/97 1510 4662 -3152 <50 12 094 <0 5 091 <5 No FP,No S 03/04/98 15 10 4190 -2680 <50 5 6 18 16 3 1 <5 No FP,No S 06/26/98 15 10 3964 -2454 <50 4 19 0 624 0 794 0 999 <5 No FP,No S 09/01/98 15 10 4144 -2634 <50 13 2 <0 5 139 0 535 5 15 No FP,No S 12/02/98 15 10 3874 -2364 <50 0 693 <0 5 <0 5 <0 5 894 No FP,No S 03/31/99 15 10 35 17 -2007 <50 133 0 586 <0 5 152 994 No FP,No S 06/04/99 15 10 3648 -2138 <50 503 0 721 <0 5 16 7 06 No FP,No S 09/02/99 15 10 4105 -2595 <50 6 14 <0 5 183 0 848 <5 No FP,No S 11/29/99 1510 39 16 -2406 <50 0 585 0 633 <0 5 145 269 No FP,No S 03/16/00 1510 35 16 -2006 57 5 170 <0 5 <0 5 <05 493 No FP,No S 06/26/00 15 10 3780 -2270 52 3 369 <0 5 2 2 0 825 <2[2] No FP,No S 09/28/00 15 10 4205 -2695 <50 134 <0 5 <0 5 <0 5 <2[2] No FP,No S 12/19/00 1510 37 68 -2258 <50 0 561 149 <0 5 300 566 No FP,No S 03/15/01 15 10 3550 -2040 91 6[31 <2 [4] 6 71 [41 <2 [4] <2 [41 89 2 [2] No FP,No S Arco 2130_4QMR02 5 of 12