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Table 1 Groundwater Monitoring Data 1995 to Present ARCO Service Station No 2130 7906 North El Dorado Street, Stockton, California Well Elevation Static Water Groundwater Ethyl- 7 otal Number Date T'op of Casing 1 op of Screen Lev(A Elevation T P146 Benzene Toluene benzene Xylene MTBE Obs�xvations MW-4 02/28/95 1457 5500 5427 -3970 <50 0 9 <0 5 <0 5 <0 5 NA No FP,No S MW-4 05/19/95 1457 5238 -3781 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-4 08/28/95 14 57 54 10 -3953 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-4 12/07/95 1457 5269 -38 12 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-4 02/05/96 1457 50 12 -3555 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-4 05/30/96 1457 4721 -3264 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-4 09/18/96 1457 51 80 -3723 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-4 11/26/96 1457 48 84 -3427 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-4 03/24/97 1457 4384 -2927 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-4 05/20/97 1457 4434 -2977 <50 <0 5 <0 5 <0 5 <0 5 <3 No I P,No S MW-4 08/19/97 1457 4789 -33 32 <50 <0 5 <0 5 <0 5 <0 5 <5 No IT,No S MW-4 11/19/97 1457 4601 -3144 <50 1 1 0 68 <0 5 054 <5 No FP,No S MW-4 03/04/98 1457 4164 -2707 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-4 06/26/98 1457 39 16 -2459 <50 141 <0 5 <0 5 <0 5 <5 No 17P,No S MW-4 09/01/98 14 57 41 83 -2726 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-4 12/02/98 14 57 3822 -23 65 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-4 03/31/99 1457 3477 -2020 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-4 06/04/99 1457 35 86 -2129 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-4 09/02/99 1457 4059 -2602 <50 <0 5 <0 5 <0 5 <0 5 <5 No 1P,No S MW-4 11/29/99 1457 38 78 -2421 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S MW-4 03/16/00 1457 3475 -20 18 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S MW-4 06/26/00 14 57 3721 -2264 <50 <0 5 <0 5 <0 5 <0 5 <2[2] No FP,No S C�ARC012 E 301QTRLYI213og200 xis Delta Page 4 of 10 9119/00 I