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s 0 0 Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2093, Tracy, California Floating Change Concentrations inµg/L m Top-of-casing Depth-to- product Water-level since last Well number elevation, water, thickness elevation, measurement, Total and date in feet(a) in feel in feet in feet(b) in feet Benzene Toluene Eth lbenzene Xylenes TPH-G MTBE DO 4/25/95 1027 -- 37 80 0 12 <0 5 <0 5 <0 5 <0 5 <50 7/27/95 1038 -- 3769 0 11 10/26/95 1041 -- 37 66 003 2/12/96 1001 -- 3806 -040 <0 5 <0 5 <0 5 <0 5 <50 4/18/96 1023 -- 3784 022 7/18/96 1040 -- 3767 0 17 <0 5 <0 5 <0 5 <0 5 <50 <5 11/15/96 1093 -- 37 14 0 53 3/14/97 6/4/97 -- 8/11/97 NP 10 56 -- 3751 -- <0-5 <0 5 <0 5 <0 5 <50 <2 5 045 11/17/97 1047 -- 37.60 -009 -- _ ATR-11 8/25/91 46 84 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 9/24/91 950 3734 9/25/91 -_ -- -- -- <0 5 <0 5 <0 5 <0 5 <50 -- -- 1/23/92 895 -- 3789 <0 5 <0 5 <0 5 <0 5 <50 -- -- 4/20/92 878 -- 3806 -0 17 -- -- _ -- -- 4/21/92 -- -- -- ._ <0 5 <0 5 <0 5 <0 5 <50 -- -- 7/8/92 9 12 -- 37 72 <0 5 <0 5 <0 5 <0 5 <50 -- 10/7/92 930 -- 3754 0 18 <0 5 <0 5 <0 5 <0 5 <50 1/18/93 780 -- 3904 -1 50 <0 5 <0 5 <0 5 <0 5 <50 -- 4/14/93 847 -- 3837 067 <0 5 <0 5 <0 5 <0 5 <50 8/31/93 938 -- 3746 0 91 <0 5 <0 5 <0 5 <0 5 <50 10/27/93 931 -- 37 53 -007 <0 5 <0 5 <0 5 <0 5 <50 -- _- 2/18/94 883 -- 3801 -048 0 8 1 <0 3 0 6 <10 5/20/94 8 93 3791 0 10 <0 3 <0 3 <0 3 <0 5 <10 -- 10/7/94 934 -- 3750 041 <0 5 <0 5 <0 5 <0 5 <50 -- - 12/16/94 8 91 -- 37 93 -043 <0 5 <0 5 <0 5 <0 5 <50 2/28/95 8 85 -- 37 99 -006 <0 5 <0 5 <0 5 <0 5 <50 4/25/95 9 11 -- 3773 026 <0 5 <0 5 <0 5 <0 5 <50 7/27/95 943 -- 3741 032 10/26/95 959 -- 3725 0 16 2112196 842 -- 3842 -1 17 <0 5 <0 5 <0 5 <0 5 <50 4/18/96 903 -- 3781 0 61 4747`TABLES12093NOV7 XLS