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0 0 0 <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 /> ATR-5 <br /> 3/10/89 4873 -- -- -- 693 <5 0 327 7 6600 <br /> 6129189 1052 -- 3821 -- 490 2 4 280 1 3 2200 -- <br /> 9/18/89 1098 -- 3775 046 68 1 1 63 5 8 1000 <br /> 12/27/89 1076 -- 3797 -022 94 2 150 <1 22{}0 - -- <br /> 4118/90 1090 -- 37 83 0 14 120 2 6 6 8 140 1900 -- <br /> 10/16/90 -- -- -- -- 18 4 7 79 16 1000 -- <br /> 10/19/90 11 10 -- 3763 -- _ _ -- <br /> 1/10/91 1084 -- 3789 -026 7 1 1 2 16 2 6 350 '- <br /> 4/10/91 1067 -- 3806 -0 17 4 6 <0 5 7 <0 5 370 -- <br /> 7/10/91 1102 -- 3771 035 9 5 <0 5 18 15 1200 ` <br /> 9/24/91 1129 -- 3744 027 <O 5 <0 5 <0 5 <0 5 <50 -- <br /> 1123/92 1078 -- 3795 -051 14 15 15 <0 5 180 <br /> 4/20/92 1070 -- 3803 -008 -- <br /> -- -- -- -- -- -- <br /> 4/21/92 -- -- - 16 <0 5 2 <0 5 290 <br /> 7/8/92 1097 -- 3776 -- <0 5 <0 5 0 6 <0 5 240 -- -- <br /> I0/7/92 11 11 -- 3762 0 14 -- -- -- <br /> 10/8/92 -- -- -- -- <0 5 <0 5 <0 5 <0 5 160 -- <br /> 1/18/93 994 -- 3879 '- <br /> 1/19/93 -- -- -- -- 2 5 <0 5 7`9 13 1000 -_ <br /> 4/14/93 10 47 -- 3826 __ -- _ <br /> 4/15/93 -- -- -- -- 15 <0 5 8 3 0 9 810 -- <br /> 8/31193 11 16 -- 3757 -- <0 5 <0 5 <0 5 <0 5 80 -- <br /> 10/27/93 11 11 -- 3762 -005 <0 5 <0 5 <0 5 <0 5 63 <br /> 2/18194 10 73 -- 3900 -038 3 5 1 4 160 _- <br /> 5/20/94 10 82 -- 3791 009 <0 3 2 12 17 600 -- <br /> 10/7/94 11 14 -- 37 59 032 <0 5 <0 5 <0 5 <0 5 660 -- <br /> 12/16/94 1077 -- 3796 -037 6 5 <0 5 <0 5 <0 5 410 _. <br /> 2/28/95 1080 -- 37 93 0 03 <0 5 0 6 <0 5 <0 5 60 -- -- <br /> 4/26/95 1104 -- 3769 024 <0 5 <0 5 <0 5 <0 5 83 �- <br /> 7/27195 1127 -- 37 46 023 <0 5 <0 5 <0 5 12 58 -~ <br /> 10/26/95 (c) 1051 - -0 76 <br /> 10/27/95 -- -- -- <5 <0 5 <0 5 <0 5 <520 <br /> 2/12/96 960 -- -- -- 1 <0 5 <0 5 <0 5 92 <br /> 4/18/96 806 -- -- -1 54 <0 5 <0 5 <0 5 <0 5 60 -- -- <br /> 47471TA13LES\2093NOV7\LS <br />