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• i i <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations in µg/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 in feet(a) in feet in feet in feet(b) in feet Benzene Toluene Eth lbenzene Xylenes TPH-G MTBE DO <br /> 2/28/95 1093 -- 3775 002 <0 5 <0 5 <0 5 <0 5 <50 <br /> 4/25/95 1146 -- 37 22 053 <0 5 <l 5 <0 5 <0 5 <50 <br /> 7/27/95 1173 -- 3695 027 -- -- -- -- -- -- -- <br /> 10/26/95 11 80 36 88 007 <0 5 <0 5 <0 5 <0 5 <50 <br /> 2/12/96 10 90 -- 3778 -090 <0 5 <0 5 <0 5 <0 5 <50 -- -_ <br /> 4/18/96 1130 -- 3738 0 40 -- __ __ <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 NP 1223 -- 3645 000 <0 5 <0 5 <0 5 <0 5 <50 -- 020 <br /> 6/4/97 11 52 -- 37 16 -0 71 -- -_ __ __ __ __ 040 <br /> 8/11197 NP 1186 -- 3682 034 <0 5 <)5 <0 5 <0 5 <50 <2 5 030 <br /> 11/17/97 1172 -- 3696 -014 -- -- -- -- -- -- -- <br /> ATR-10 <br /> 10/16/90 4807 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 <br /> 10/19/90 1020 -- 3787 <br /> ' <br /> 1110/91 1007 -- 38 00 -0 13 <0 5 <05 <0 5 <) 5 <50 <br /> 4110/91 1000 -- 38 07 -007 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 7/12/91 1021 -- 3786 021 <0 5 <) 5 <0 5 <0 5 <50 <br /> 9/24/91 1032 -- 3775 0 11 -- _. <br /> 9/25/91 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 <br /> 1/23/92 1000 -- 3807 -- <0 5 <0 5 <0 5 <0 5 <50 <br /> 4/20/92 1001 -- 38 06 001 -- __ <br /> 4121/92 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 7/8192 10 17 -- 3790 -- <0 5 <) 5 <0 5 <0 5 <50 -- <br /> 10/7/92 1023 -- 3784 006 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 1/18/93 961 -- 3846 -062 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 4/14/93 994 -- 38 13 033 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 8/30/93 1023 -- 3784 029 <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 10/27/93 1024 -- 37 83 0 01 <0 5 <) 5 <0 5 <0 5 <50 -- -- <br /> 2//8/94 1002 -- 38 05 -022 <0 3 0 4 <0 3 <0 5 <10 -- -- <br /> 5/20194 1009 -- 3798 007 <0 3 <0 3 <0 3 <} 5 <10 ._ <br /> 10/7/94 1024 -- 37 83 0 15 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 12/16/94 997 -- 38 I0 -027 <0 5 <0 5 <0 5 <0 5 <50 -- -. <br /> 2/28/95 10 15 -- 3792 0 18 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 4747TABLEs\2093Nov7 xL.s <br />