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4 <br /> 1 Y <br /> Groundwater Monitoring Data <br /> ARCO Service Station No. 2130 ` <br /> 7906 North EI Dorado Street, Stockton, California <br /> Page 4 of 7 <br /> Well Elevation Static Water Groundwater Total <br /> Number Date Top of Casing Top of Screen Level Elevation TPHG Benzene Toluene Eth lbenzene Xylene MTBE Observations <br /> MW-4 07/30/93 1457 6023 4566 880 220 50 45 68 NA No FP, No S <br /> MW-4 11/29/93 1457 WELL INACCESSIBLE No FP,No S <br /> MW-4 03/23/94 1457 5429 -3972 580 97 17 43 29 NA No FP,No S <br /> MW-4 06/22/94 1457 5441 -3984 1,700 930 44 52 20 NA No FP,No S <br /> MW-4 09/28/94 1457 5826 -4369 610 73 22 1 3 1 8 NA No FP,No S <br /> MW-4 12/01/94 1457 57 18 -4261 1,000 400 31 59 15 NA No FP, No S <br /> MW-4 02/28/95 1457 5427 -3970 <50 09 <0 5 <0 5 <0 5 NA No FP, No S <br /> MW-4 05/19/95 1457 5238 -3781 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S <br /> MW-4 08/28/95 1457 54 10 -3953 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S <br /> MW-4 12/07/95 1457 5269 -38 12 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S <br /> MW-4 02/05/96 1457 5012 -35 55 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S <br /> MW-4 05/30/96 1457 4721 -3264 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S <br /> MW-4 09/18/96 1457 5180 -3723 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S <br /> MW-4 11/26/96 1457 4884 -3427 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S <br /> MW-5 08/10/92 1510 5800 6484 -4939 NA NA NA NA NA NA No FP,No S <br /> MW-5 08/28/92 --- --- --- 380 61 18 27 48 NA No FP,No S <br /> MW-5 09/15/92 1510 6495 -5003 NA NA NA NA NA NA No FP,No S <br /> MW-5 10/06/92 15 10 65 10 -50 19 460 59 34 2 1 45 NA No FP, No S <br /> MW-5 11/11/92 1510 6440 -4950 NA NA NA NA NA NA No FP,No S <br /> MW-5 12/04/92 1510 6367 -4877 NA NA NA NA NA NA No FP,No S <br /> MW-5 01/20/93 15 10 6239 -4750 79 92 1 3 <0 5 42 NA No FP,No S <br /> MW-5 03/22/93 1510 6051 4560 NA NA NA NA NA NA No FP,No S <br /> MW-5 04/06/93 15 10 6001 4508 1,600 260 150 12 230 NA No FP,No S <br /> MW-5 07/30/93 15 10 6075 4579 790 160 88 19 71 NA No FP,No S <br /> MW-5 11/29/93 15 10 5977 -4486 9,600 1900 870 140 1300 NA No FP,No S <br /> MW-5 03/23/94 WELL INACCESSIBLE No FP,No S <br /> MW-5 06/22/94 WELL INACCESSIBLE No FP,No S <br /> MW-5 09/28/94 WELL INACCESSIBLE No FP,No S <br /> MW-5 10/11/94 1510 5877 4367 89 21 22 18 5 1 NA No FP,No S <br /> MW-5 12/01/94 15 10 5770 4260 870 280 23 41 87 NA No FP,No S <br /> MW-5 02/28/95 1510 5478 -3968 310 70 14 59 50 NA No FP,No S <br /> MW-5 05/19/95 1510 5285 -3775 66 84 <0 5 05 <0 5 NA No FP, No S <br /> N\x1s\D805\11306\010997r1 x,s Rev 2 2/13/97 <br />