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Table 1 4 Groundwater Monitoring Data 1995 to Present ARCO Service Station No 2130 7906 North EI Dorado Street, Stockton, California Well Elevation Static Water Groundwater Ethyl- rotal Numbcr Date Top o1 Casing Fop of Screen Level Elevation TPl1G Benzene Toluene benzene Xylene MI BE Obsei vations MW-2 02/28/95 15 19 6000 5508 -3989 110 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-2 05/19/95 15 19 53 15 -3796 400 23 <0 5 2 1 <0 5 NA No FP,No S MW-2 08/28/95 15 19 54 83 -3964 650 84 <]* 93 1 1 NA No FP,No S MW-2 12/07/95 15 19 5347 -3828 540 18 <1* 3 <1* NA No FP,No S MW-2 02/05/96 15 19 5193 -3674 310 2 8 0 6 1 3 0 8 NA No f P,No S MW-2 05/30/96 15 19 4791 -3272 510 31 1 0 5 9 1 3 <7** No FP,No S MW-2 09/18/96 15 19 51 80 -3661 920 150 <2 5* 22 3 5 <15* No FP,No S MW-2 11/26196 15 19 4960 -3441 520 21 <0 5 2 7 0 6 7 No HI,No S MW-2 03/24/97 15 19 4450 -2931 <500*** <3** <3** <3** <3** <20** No EP,No S MW-2 05/20/97 15 19 4509 -2990 720 71 <1* 13 1 1 <6* No FP,No S MW-2 08/19/97 15 19 48 69 -33 50 1,200 240 <5 41 <5 <50** No FP,No S MW-2 11/19/97 15 19 4677 -3I 58 <50 1 7 0 89 <0 5 087 <5 No FP,No S MW-2 03/04/98 15 19 42 18 -2699 <50 22 <0 5 <0 5 <0 5 5 1 No FP,No S MW-2 06/26/98 15 19 3987 -2468 53 4 3 65 <0 5 <0 5 1 12 652 No FP,No S MW-2 09/01/98 15 19 4161 -2642 322 484 <0 5 16 9 167 <5 No FP,No S MW-2 12/02/98 15 19 3894 -23 75 390 <0 5 <0 5 0 735 <0 5 158 No FP,No S MW-2 03/31/99 15 19 3538 -2019 98 7 6 6 069 0 579 233 655 No FP,No S MW-2 06/04/99 15 19 3667 -2148 184 11 9 <0 5 103 0 669 126 No FP,No S MW-2 09/02/99 15 19 41 23 -2604 4,820 764 <10 375 <10 191 No FP,No S MW-2 11/29/99 15 I9 3936 -24 17 791 425 <0 5 <0 5 1 14 6 54 No FP,No S MW-2 03/16/00 15 19 3539 -2020 <50 <0 5 <0 5 <0 5 <0 5 289 No FP,No S MW-2 06/26/00 15 19 3799 -2280 435 33 0 588 122 206 6 3[2J No F11,No S C IARM21301QTRLY12130g200 As Delta Page 2 of 10 9/19/00