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Table 1 Page 5of8 Groundwater Monitoring Data 1995 to Present ARCO Service Station No. 2130 7906 North EI Dorado Street, Stockton, California Well Elevation Static Water Groundwater Ethyl- Total Number Date Top of Casmg Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE Observations MW-6 03/04/98 1455 5900 4163 -2708 60 16 <05 <0 5 <0 5 <5 No FP,No S MW-6 06/26/98 1455 5900 3933 -24 78 101 0 734 <0 5 <0 5 <0 5 <5 No FP,No S MW-6 09/01/98 1455 5900 4101 -2646 205 0 684 <0 5 <0 5 <05 <5 No FP, No S MW-6 12/02/98 1455 5900 3842 -23 87 124 <05 <0 5 <05 <0 5 <5 No FP, No S MW-6 03/31/99 1455 5900 3484 -2029 676 162 <05 <0 5 <0 5 <5 No FP, No S MW-7 02/28/95 1416 53 50 5361 -3945 <50 <0 5 <0 5 <0 5 <05 NA No FP,No S MW-7 05/19/95 1416 53 50 5173 -3757 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-7 08/28/95 1416 53 50 5351 -3935 <50 <0 5 <0 5 <0 5 <0 5 NA No FP, No S MW-7 12/07/95 1416 53 50 5210 -3794 <50 <0 5 <05 <0 5 <0 5 NA No FP,No S MW-7 02/05/96 1416 53 50 4958 -3542 <50 <05 <0 5 <05 <0 5 NA No FP,No S MW-7 05/30/96 1416 53 50 466S -3249 <50 <05 <0 5 <0 5 <0 5 <3 No FP,No S MW-7 09/18/96 1416 5350 5043 -3627 <50 <0 5 <05 <0 5 <05 <3 No FP,No S MW-7 11/26/96 1416 53 50 4830 -3414 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-7 03/24/97 1416 5350 4320 -2904 <200*** <2** <0 5 <0 5 <05 <4** No FP, No S MW-7 05/20/97 1416 5350 43 81 -2965 <50 <0 5 <0 5 <05 <05 <3 No FP,No S MW-7 08/19/97 1416 5350 4725 -3309 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-7 11/19/97 1416 53 50 4542 -3126 <50 2 6 2 9 0 80 4 5 <5 No FP,No S MW-7 03/04/98 1416 53 50 4077 -2661 <50 <0 5 <0 5 <05 <0 5 <5 No FP,No S MW-7 06/26/98 1416 53 50 3857 -2441 <50 <0 5 <0 5 <05 <0 5 <5 No FP, No S MW-7 09/01/98 1416 5350 4042 -2626 <50 <05 <0 5 <0 5 <0 5 <5 No FP,No S MW-7 12/02/98 1416 5350 3770 -23 54 <50 <05 <0 5 <0 5 <05 <5 No FP, No S MW-7 03/31/99 1416 53 50 3416 -20 00 <50 1 11 106 0 932 273 <5 No FP,No S C P1E 1ARC012130\QTRLY12130Q 199 XLS Table 1 � �