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9 9 0 <br /> Table 1. Summary of Groundwater <br /> Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations in 4g/L m <br /> Top-of-casing Depth-to- product Water-level since last <br /> Well number elevation, water, thickness elevation, measurement, Total <br /> and date to feet a) in feet in feet in feet(b) in feet Benzene Toluene Eth lbenzene Xylenes TPH-G MTBE DO <br /> 7110/91 1106 -- 37 62 -0 24 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 9/24/91 1129 -- 3739 -023 -- -- _- _- -- <br /> 9/25/91 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 1123/92 1096 37 72 -- <0 5 <0 5 <0 5 <0 5 <50 -- .- <br /> 4/20/92 1088 -- 3780 008 -- -- -_ -_ <br /> 4121/92 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 7/8/92 1106 -- 3762 -- <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 10/7/92 11 I6 -- 3752 -0 10 <0 5 <0 5 <0 5 <0 5 <50 <br /> 1/18/93 1034 -- 3834 0 82 <0 5 <0 5 <0 5 <0 5 <50 <br /> 4/14/93 1070 -- 3798 -036 <0 5 <0 5 <0 5 <0 5 <50 <br /> 8130193 11 17 -- 3751 -047 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/27/93 11 23 3745 -006 <0 5 <0 5 <0 5 0 7 <50 -- <br /> 2/17/94 10 89 -- 3779 034 -- -- -- -_ <br /> 2/I8/94 -- -- -- -- <0 3 0 4 <0 3 <0 5 <10 -- -- <br /> 5/20/94 1097 3771 -- <0 3 <0 3 <0 3 <0 5 <10 -- -- <br /> 1017/94 11 19 -- 3749 -022 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 12/16/94 1091 -- 37 77 028 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 2/28/95 10 93 -- 3775 -0 02 <0 5 <0 5 <0 5 <0 5 <50 -- •. <br /> 4/25/95 1146 3722 -053 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 7127/95 1173 -- 3695 -027 -- — __ -_ <br /> 10/26/95 1180 -- 36 88 -007 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 2/12196 1090 -- 3778 090 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 4/18/96 1130 -- 3738 -040 -- -- -- _- <br /> 7/18/96 1168 3700 -038 <0 5 <0 5 <0 5 <0 5 <50 <5 <br /> 11/15/96 1223 -- 3645 -055 -- __ __ -_ <br /> 3/14/97 1223 -- 3645 000 <0 5 <0 5 <0 5 <0 5 <50 -- 020 <br /> 614197 11.52 -- 37.16 0.71 — -- -- — -- — 040 <br /> ATR-10 <br /> 10/16/90 4807 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 10/19/90 1020 -- 3787 _ <br /> 1/10/91 1007 -- 3800 0 13 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 4/10/91 1000 -- 3807 007 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 7112191 1021 -- 37 86 -0 21 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 9/24/91 1032 -- 3775 -0 11 -- -- __ <br /> 47471TABLES12093JUN7 XLS <br /> II <br />