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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 msl m /L m /L m /L m /L m /L m /L Observations MW-6 02/28/95 1455 5900 5454 -3999 55 <0 5 <0 5 <0 5 <0 5 NA No FP, No S 05/19/95 1455 5259 -3804 96*** <0 5 <0 5 <0 5 <0 5 NA No FP, No S 08/28/95 1455 5425 -3970 120 <0 5 <0 5 <0 5 <0 5 NA No FP, No S 12/07/95 1455 5291 -3836 <200** <0 5 <0 5 <0 5 <0 5 NA No FP, No S 02/05/96 1455 5039 -3584 130 <0 5 <0 5 <0 5 <0 5 NA No FP, No S 05/30/96 1455 4738 -3283 140*** <0 5 <0 5 <0 5 <0 5 <3 No FP, No S 09/18/96 1455 51 26 -3671 <200*** <0 5 <0 5 <0 5 <0 5 <3 No FP, No S 11/26/96 1455 4901 -3446 <200*** <0 5 <0 5 <0 5 <0 5 <4`* No FP, No S 03/24/97 1455 4397 -2942 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP, No S 05/20/97 1455 4452 -2997 180 <2** <0 5 <0 5 <0 5 <3 No FP, No S 08/19/97 1455 4812 -3357 190 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 11/19/97 1455 4626 -31 71 95 34 21 1 0 25 <5 No FP, No S 03/04/98 1455 41 63 -2708 60 1 6 <0 5 <0 5 <0 5 <5 No FP, No S 06/26/98 1455 3933 -2478 101 0 734 <0 5 <0 5 <0 5 <5 No FP, No S 09/01/98 1455 41 01 -2646 205 0 684 <0 5 <0 5 <0 5 <5 No FP, No S 12/02/98 1455 3842 -2387 124 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 03/31/99 1455 3484 -2029 676 1 62 <0 5 <0 5 <0 5 <5 No FP, No S 06/04/99 1455 3606 -21 51 118 1 77 <0 5 <0 5 <0 5 886 No FP, No S 09/02/99 1455 4063 -2608 201 284 <0 5 <0 5 <0 5 141 No FP, No S 11/29/99 1455 3878 -2423 53 0 839 <0 5 <0 5 <0 5 <2 5 No FP, No S 03/16/00 1455 3484 -2029 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP, No S 06/26/00 1455 3735 -2280 191 1 29 <0 5 <0 5 <0 5 <2[2] No FP, No S 09/28/00 1455 41 61 .2706 <50 250 <0 5 <0 5 <0 5 <2[2] No FP, No S 12/19/00 1455 3739 -2284 <50 1 56 <0 5 <0 5 <0 5 <2 5 No FP, No S 03/15/01 1455 3514 -2059 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP, No S 06/20/01 1455 3835 -2380 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP, No S 09/12/01 1455 4268 -2813 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP, No S 12/12/01 1455 3950 -2495 73[6] <1 0[4] <1 0[4] <1 0[4] <1 0[4] <0 50[2] No FP, No S 03/13/02 1455 3663 -2208 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP, No S 06/18/02 1455 3874 -2419 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP, No S 09/11/02 1455 4384 -2929 <50 <0.50 <0.50 <0 50 <0.50 <0.50[2] No FP, No S k V5 BP ARC0121301Quarter1yl3_QTR 021Arco_2130_3QMR02 6 of 11