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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 sca level In feet ui feet in feet(a) in feet Benzene Toluene Cth lbenzene Xylenes 11311-13 MI BE 6118190 1695 -1615 -038 <05 <05 <05 <05 7/12/90 1736 -- -1656 -0 41 -- -- -- -- 8/16/90 17 62 -1682 -026 -- - - -- _-- 9/17/90 1793 -- -17 13 -031 <0 5 <05 <0 5 <0 5 <50 9119190 1793 -- -17 13 000 <0 5 <0 5 <0 5 <0 S <50 10/11/90 1798 -- -17 18 -005 -- -- 12/6/90 1783 -- -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 -- -1573 094 <0 5 <0 5 <0 5 <0 5 <50 7116191 18 18 -- -17 38 -165 <0 5 <0 5 <0 5 <0 5 <50 10/8/91 1863 -1783 -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 4122192 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 4129/93 14 12 -- -13 32 204 <0 5 <0 5 <0 5 <0 5 <50 8/5193 1548 -- -1468 -1 36 <0 5 <0 5 <0 5 <0 5 <50 11/10/93 15 94 -- -15 14 -046 <0 5 <0 S <0 5 <0 S <50 3121/94 1462 -- -13 82 1 32 <0 3 <0 3 <0 3 <0 5 <10 6127/94 1498 -- -14 18 -036 <0 3 <0 3 <0 3 <0 5 <10 9129194 1609 -- -1529 -1 11 <0 5 <0 S <0 5 <0 5 <50 -- 12/8194 1566 -- -1486 043 <0 5 <0 5 <0 5 <0 5 <50 3/8195 1347 -- -1267 2 19 <0 5 <0 5 <0 5 <0 5 <50 611195 l 194 -11 14 1 53 <0 5 <0 5 <0 5 <0 5 <50 9/11/95 1382 -- -1302 -1 88 <0 5 <0 5 <0 5 <0 5 <50 -- 12/5/95 1422 -- -1342 -040 -- -- --_ 3/18/96 1005 -- -925 4 17 <0 5 <0 5 <0 5 <0 5 <50 - 6/18195 1023 -- -943 -0 18 -- -- 9/25/96 1255 -- -11 75 -232 <0 5 <0 5 <0 5 <0 5 <50 <5 33161]AIII.f M2133Y'116 X1 S