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• • i <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2133, Stockton, California <br /> T op-of casing Depth-to- Product Water-level Change since Concentrations in L <br /> Well number elevation, feet water, thickness, elevation, last measurement, Total <br /> and date above mean sea level III feet to feet to feet(a) in feet Benzene Toluene Eth lbenzene Xylenes. TPI/-G MTBE <br /> E-1.0 1 26 <br /> 8126188 <br /> 11/28/88 -- -- -- -- 2780 5240 690 3570 -_ <br /> 2/27189 -- -- -- -- 2970 3020 750 5030 -- -- <br /> 5/30189 -- -- -- -- 5520 5760 1060 6900 -- <br /> 8/22/89 -- -- -- 2590 3220 570 5200 -- <br /> 12/4/89 '- -- -- 1300 1200 400 3200 <br /> 114/90 1637 -- -15 11 <br /> 2/1/90 16 14 -- -14 88 023 -- <br /> 2115190 16120 <br /> _-- -� -- <br /> 2/22/90 1690 -- -15 64 078 -- -- -- <br /> 318190 1590 -- -14 64 100 339 606 268 1480 -- -- <br /> 4/5/90 1606 -- -14 80 -0 16 -- �- -- <br /> 4/19/90 1620 -- -14 94 -0 14 -- <br /> 5/10/90 -- <br /> 5/24/90 1642 -- -15 16 -022 -- <br /> 6/5/90 1640 -- -15 14 002 -- _- -- <br /> 6/19/90 17 14 -- -15 88 -074 3510 3180 790 6490 _- <br /> 7112190 1721 -- -1595 -007 -- -_ <br /> 8116/90 1757 -1631 -036 <br /> 9/17190 17 82 -- -1656 -025 -- -- -- -- -- <br /> 9/19/90 17 82 -- -1656 000 36 39 <50 7700 20000 <br /> 10/11/90 1794 -- -1668 -0 12 -- - -- <br /> 12/6190 1778 -- -1652 0 16 -- ._ -- -- -- <br /> 2/12/91 1747 -1621 031 1100 730 320 3600 7800 -- <br /> 2/25/91 1741 -- -16 15 006 ._ — <br /> 4/23/91 4/23/91 16 56 -1530 0 85 670 180 200 750 8200 <br /> 7/16191 19 11 -- -1785 -2 55 850 230 210 1 100 9400 <br /> 1018191 1960 -- -1834 -049 860 150 260 820 8700 -- <br /> 1/22/92 18 24 -- -1698 1 36 3200 800 3600 3600 32000 ` <br /> 4122192 17 14 -- -15 88 1 10 2800 1300 880 3400 26000 -- <br /> 7/29/92 18 62 -- -1736 -148 3400 1 100 1400 6400 42000 <br /> 10/29/92 1899 -- -1773 -037 3600 700 1200 4000 25000 — <br /> 331611 ABI l S12133MY6 XI 4 <br />