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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2133, Stockton, California <br /> Tap-of-casing Depth-to- Product Water-level Change since Concentrations in [ L <br /> Well number elevation, feet water, thickness, elevation, last measurement, Total <br /> Mid date above mean sea level In feet In feet In feet (a) In feet Benzene Toluene <br /> PR-2 065 Cth [benzene xylenes fPl{-G MTBE <br /> 8/26188 -- -- -- <0 5 2 <0 5 3 <br /> 11128/88 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <br /> 2/27/89 -_ _. <0 5 <0 5 <0 5 <0 5 -- <br /> 5/30/89 <br /> 8/22189 -- -- <0 5 <0 5 <0 5 <0 5 -- <br /> 12/4/89 '- <br /> 1/4/90 1574 -- -1509 <br /> 2/l/90 15 52 -- -1487 0222/15/90 1549 -- -14 84 003 <br /> 2122/90 1630 -- -1565 -081 <br /> 3/8/90 1528 -- -14 63 1 02 <0 5 <0^5 <0 5 <0 5 - <br /> 4/5/90 1542 -- -1477 -0 14 --4/19/90 1650 -1585 -108 -- _ --5/10/90 15 89 -1524 0 61 -- <br /> 5/24/90 1588 -- -1523 001 <br /> 615/90 -- <br /> 6/18/90 1642 -- -1577 -054 _-_- <br /> 7/12190 1663 -1598 -021 _- <br /> 8/16/90 1732 -1667 -0699/17190 1765 -- -1700 -0339/19/90 1765 -- -1700 000 <0 5 <0 5 <0 5 <0 5 <50 <br /> 10/11190 1729 -- -1664 036 -- <br /> 12/6/90 17 14 -1649 0 15 -- _ -- -_- --2/11/91 1682 -- -l 6 17 032 <0 5 <0 5 <0 5 <0 5 <50 -_ <br /> 2125/91 1678 -- -16 13 004 _- <br /> 4/23/91 1584 -- -15 19 094 <br /> 7116191 1822 -- -1757 -238 <0 5 <0 5 <0 5 <0 5 <50 <br /> 10/8/91 1882 -- -18 17 -0601/22/92 17 17 -1652 1 65 <0 5 <0 5 <0 5 <0 5 <50 _- <br /> 4122/92 1629 -- -1564 088 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 7/29/92 1789 -- -1724 -1 60 <0 5 <0 5 <0 5 <0 5 <50 _- <br /> 10/29/92 1831 -- -1766 -042 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 3316N I AI11 15121335! I'6 X[5 <br />