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TABLE 1 GROUNDWATER MONITORING DATA ARCO Service Station No 2130 7906 North EI 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) mg/L mg/L mg/L mg/L mg1L mg/L Observations_ _ MW-7 02/28/95 1416 5350 5361 -3945 <50 <0 5 <0 5 <0 5 <0 5 NA No FP, No S 05/19/95 1416 51 73 -3757 <50 <0 5 <0 5 <0 5 <0 5 NA No FP, No S 08/28/95 1416 5351 -3935 <50 <0 5 <0 5 <0 5 <0 5 NA No FP, No S 12/07/95 1416 5210 -3794 <50 <0 5 <0 5 <0 5 <0 5 NA No FP, No S 02/05/96 1416 4958 -3542 <50 <0 5 <0 5 <0 5 <0 5 NA No FP, No S 05/30/96 1416 4665 -3249 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP, No S 09/18/96 1416 5043 -3627 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP, No S 11/26/96 1416 4830 -3414 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP, No S 03/24/97 1416 4320 -2904 <200*** <2** <0 5 <0 5 <0 5 <4** No FP, No S 05/20/97 1416 4381 -2965 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP, No S 08/19/97 1416 4725 -3309 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 11/19/97 1416 4542 -31 26 <50 26 29 080 45 <5 No FP, No S 03/04/98 1416 4077 -2661 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 06/26/98 1416 3857 -2441 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 09/01/98 1416 4042 -2626 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 12/02/98 1416 3770 -2354 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 03/31/99 1416 3416 -2000 <50 1 11 1 06 0 932 273 <5 No FP, No S 06/04/99 1416 3549 -21 33 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 09/02/99 1416 4002 -2586 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP, No S 11/29/99 1416 3821 -2405 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP, No S 03/16/00 1416 3414 -1998 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP, No S 06/26/00 1416 3678 -2262 <50 <0 5 <0 5 <0 5 <0 5 <2[2] No FP, No S 09/28/00 1416 41 02 -2686 <50 <0 5 <0 5 <0 5 <0 5 <2[2] No FP, No S 12/19/00 1416 3663 -2247 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP, No S 03/15/01 1416 3450 -2034 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP, No S 06/20/01 1416 3779 -2363 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP, No S 09/12/01 1416 4200 -2784 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP, No S 12/12/01 1416 3885 -2469 <50 <1 0[4] <1 0[4] <1 0[4] <1 0[4] <0 50[2] No FP, No S 03/13/02 1416 3593 -21 77 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP, No S 06/18/02 1416 3818 -2402 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP, No S 09/11/02 14.16 43.28 -29.12 <50 <0.50 <0.50 <0.50 <0 50 <0.50[2] No FP, No S k V5 BP ARC0121301Quarter1yl3_QTR 021Arco_2130_3QMR02 7 of It