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9 0 ! <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations inµg/1, m <br /> Top-of-casing Depth-to- product Water-level since last <br /> Well number elevation, water, thickness elevation, measurement, Total <br /> and date in feet(a) in feet in feet in feet(b) m feet Benzene Toluene Eth (benzene X lenes TPH-G MTBE DO <br /> 10/26/95 12 18 -- 37 17 -- <0 5 <0 5 <0 5 <0 5 <50 <br /> 2/12/96 1157 37 78 -061 <0 5 <0 5 <0 5 <0 5 <50 -- -� <br /> 4/18196 11 91 -- 37 44 034 -- <br /> 7/18/96 12 01 -- 3734 O 10 <0 5 <0 5 <0 5 <0 5 <50 <br /> 11/15/96 1263 -- 36 72 062 <br /> 3/14197 - <br /> -- -- -- -- -- <br /> 6/4/97 1201 -- 3734 -- -- 0 14 <br /> 8/11197 NP 1223 37 12 022 <0 5 <0 5 <0 5 <0 5 <50 56 038 <br /> 11/17/97 1224 -- 3711 001 — __ __ <br /> ATR-7 <br /> 3/10/89 4965 -- -- -- -- <0 5 <0 5 <0 5 17 <200 <br /> 6121/89 11 90 -- 3775 -- 1 <0 3 0 6 0 5 <S0 _- <br /> 9/18/89 1198 -- 3767 008 0 4 <0 3 <0 3 1 1 <50 -- <br /> 12/27/89 11 94 -- 3771 -004 10 0 9 2 7 7 9 90 -- <br /> 4118/90 1201 -- 3764 007 6 1 2 6 2 1 5 8 <50 <br /> 10/16/90 __ <br /> U 5 <0 5 <0 5 <50 <br /> 90 1220 -- 3745 <br /> 1110/91 -- -- -- 6 <0 5 1 8 4 1 <50 -- <br /> 4110/91 <br /> 7/10191 __ -- -- -- -- <br /> 9/24/91 12 34 -- 3731 -- <br /> -- -- -- -- -- <br /> 9/25/91 -- -- -- ) 3 <0 5 <0 5 <0 5 <50 <br /> 1/23192 <br /> 4/20192 <br /> 718/92 "- <br /> 10/7/92 1221 -- 3744 -- <br /> I0/8192 -- -- <0 5 <0 5 <0 5 <0 5 <50 <br /> 1/18/93 1133 -- 3832 <br /> 1/19/93 -- -_ -- -- 1 <0 5 0 6 <0 5 <50 _- <br /> 4114/93 1175 -- 3790 -- <br /> 4/15/93 -- 2 9 <0 5 <0 5 <0 5 <50 -- <br /> 8131193 1224 -- 3741 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 10/27/93 1223 -- 3742 -001 <0 5 <0 5 <0 5 13 <50 -- _- <br /> 2/18/94 11 93 -- 3772 -030 <0 3 <0 3 <0 3 <0 5 <10 <br /> 47471TABLES12093NOV7 ALS <br />