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• i • Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2133, Stockton, California Top-of-casing Depth-to- product Water-level Change since Concentrations in /L Well number elevation, feet water, thickness, elevation, last measurement, Total and date above mean sea level in feet in feet in feet(a) to feet Benzene Toluene Eth !benzene Xylenes TPH-G MTBE 6/18/90 1695 -16 15 -038 <0 5 <0 5 <0 5 <0 5 -- -- 7/12/90 1736 -- -1656 -041 8/16/90 1762 -- -1682 -026 9/17/90 1793 -- -l 7 13 -031 <0 5 <0 5 <0 5 <0 5 <50 -- 9/19/90 1793 -- -l 7 13 000 <0 5 <0 5 <0 5 <0 5 <50 -- 10/11/90 1798 -17 18 -0 05 12/6/90 17 83 -- -1703 0 15 2/11/91 1753 -- -1673 030 <0 5 <0 5 <0 5 <0 5 <50 -- 2/25/91 1747 -- -1667 006 4/23/91 1653 -- -15 73 094 <0 5 <0 5 <0 5 <0 5 <50 -- 7/16191 18 18 -- -1738 -1 65 <0 5 <0 5 <0 5 <0 5 <50 -- 10/8/91 1863 -- -17 83 -045 <0 5 <0 5 <0 5 <0 5 <50 -- 1/22/92 1749 -- -1669 1 14 <0 5 <0 5 <0 5 <0 5 <50 -- 4/22/92 1690 -- -16 10 059 <0 5 <0 5 <0 5 <0 5 <50 -- 7/29/92 1840 -- -1760 -1 50 <0 5 <0 5 <0 5 <0 5 <50 -- 10/29/92 18 84 -- -1804 -044 <0 5 <0 5 <0 5 <0 5 <50 -- 1/27/93 16 16 -- -1536 268 <0 5 <0 5 <0 5 <0 5 <50 -- 4/29/93 14 12 -- -13 32 2 04 <0 5 <0 5 <0 5 <0 5 <50 -- 8/5/93 1548 -- -1468 -136 <0 5 <0 5 <0 5 <0 5 <50 -- 1 1/10193 1594 -- -15 14 -046 <0 5 <0 5 <0 5 <0 5 <50 -- 3/21/94 14 62 -- -13 82 1 32 <0 3 <0 3 <0 3 <0 5 <10 -- 6/27/94 1498 -- -14 18 -036 <0 3 <0 3 <0 3 <0 5 <10 -- 9129/94 1609 -- -1529 -1 11 <0 5 <0 5 <0 5 <0 5 <50 -- 12/8/94 1566 -14 86 043 <0 5 <0 5 <0 5 <0 5 <50 -- 3/8195 1347 -- -12 67 2 19 <0 5 <0 5 <0 5 <0 5 <50 -- 6/l/95 11 94 -- -11 14 1 53 <0 5 <0 5 <0 5 <0 5 <50 -- 9/11/95 13 82 -- -1302 -1 88 <0 5 <0 5 <0 5 <0 5 <50 -- 12/5/95 1422 -1342 -040 3/18/96 1005 -- -9 25 4 17 <0 5 <0 5 <0 5 <0 5 <50 -- 6/18195 1023 -- -9 43 -0 18 9/25/96 12 55 -11 75 -232 <0 5 <0 5 <0 5 <0 5 <50 <5 12/4/96 12 05 -- -1125 050 33I61TABLESU133DEC6 XLS