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• r 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 Casmg Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE Number Date (feet ins/ (feet b s) feet b s feet msl L peZL L g/L /L L Observations- MW-7 02/28/95 14 16 5350 5361 -3945 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S 05/19/95 14 16 5173 -3757 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S 08/28/95 1416 53 51 -3935 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S 12/07/95 1416 52 10 -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 14 16 4930 -34 14 <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 14 16 4381 -29 65 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S 08/19/97 14 16 4725 -3309 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S 11/19/97 14 16 4542 -3126 <50 2 6 2 9 0 80 4 5 <5 No FP,No S 03/04/98 14 16 4077 -2661 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S 06/26/98 14 16 3857 -2441 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S 09/01/98 14 16 4042 -2626 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S 12/02/98 14 16 3770 -2354 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S 03/31/99 14 16 34 16 -2000 <50 1 11 106 0 932 273 <5 No FP,No S 06/04/99 14 16 3549 -2133 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S 09/02/99 14 16 4002 -2586 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S 11/29/99 14 16 3821 -2405 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S 03/16/00 14 16 34 14 -1998 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S 06/26/00 14 16 3678 -22 62 <50 <0 5 <0 5 <0 5 <0 5 <2[2] No FP,No S 09/28/00 14 16 4102 -2686 <50 <0 5 <0 5 <0 5 <0 5 <2[2] No FP,No S 12/19/00 14 16 3663 -2247 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S 03/15/01 14 16 3450 -2034 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP,No S 06/20/01 14 16 3779 -2363 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP,No S 09/12/01 14 16 4200 -2784 <50 <2 [4] <2 [4] <2 [4] <2 [4] <2[2] No FP,No S 12/12/01 14 16 3885 -24 69 <50 <1 0[4] <1 0[4] <1 0[4] <1 0[4] <0 50[2] No FP,No S 03/13/02 14 16 3593 -2177 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP,No S 06/18/02 14 16 38 18 -2402 <50 <0 50 <0 50 <0 50 <0 50 <0 50[2] No FP,No S Arco_2130_Quarterly Data XLS 7 of 12