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0 • 0 Table 1. Summary of Groundwater Monitoring Data: Water EIevations and Analyses ARCO Facility 2093, Tracy, California FIoating Change Concentrations inµg/L m r Top-of-casing Depth-to- product Water-level since last Well number elevation, water, thickness elevation, measurement, Total and date in feet a) in feet in feet in feet ) in feet Benzene Toluene Eth lbenzene Xylenes TPH-G MTBE DO 12/27/89 1194 -- 3771 004 10 0 9 2 7 7 9 90 4/18190 1201 -- 37 64 -007 6 1 2 6 2 1 5 8 <50 10/16/90 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 -- 10/19/90 12 20 -- 3745 -- 1/10/91 -- -- -- -- 6 <0 5 18 4 1 <50 -- 4/10/91 7110/91 -_ -_ -- -- _ -- -- -- -- -- 9/24/91 1234 -- 3731 9/25/91 -- -- -- 13 <0 5 <0 5 <0 5 <50 I/23/92 -- -- -- -- -- 4/20/92 -- -- -_ -- -- -- 7/8/92 -- 10/7/92 1221 -- 3744 -- 10/8/92 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 -- -- 1/18/93 1133 - 3832 1/19/93 -- -- -- -- 1 <0 5 0 6 <0 5 <50 r- 4/14/93 1175 -- 3790 -- _-_- 4/15/93 -- 2 9 <0 5 <0 5 <0 5 <50 8/31/93 1224 -- 3741 -- <0 5 <0 5 <0 5 <0 5 <50 10/27/93 1223 -- 3742 001 <0 5 <0 5 <0 5 13 <50 2/18194 1193 -- 37 72 030 <0 3 <0 3 <0 3 <0 5 <10 5120194 1200 -- 3765 -007 <0 3 <0 3 <0 3 <0 5 <10 IOM94 12 23 -- 3742 -023 <0 5 <0 5 <0 5 <0 5 <50 12/16/94 1194 -- 3771 029 <0 5 <0 5 <0 5 <0 5 <50 2/28/95 1200 -- 3765 -006 <0 5 <0 5 <0 5 <0 5 <50 -` 4/25/95 1241 -- 37 24 -041 <0 5 <0 5 <0 5 <0 5 <50 7/27/95 1261 -- 3704 -020 <0 5 <0 5 <0 5 <0 5 <50 10/26/95 12 67 -- 3698 -006 <0 5 <0 5 <0 5 <0 5 <50 - 2/12/96 1195 -- 3770 072 <0 5 <0 5 <0 5 <0 5 <50 4118/96 1235 -- 3730 -040 <0 5 <0 5 <0 5 <0 5 <50 - 7/18/96 1245 -- 3720 -010 <0 5 <0 5 <0 5 <0 5 <50 28 - 11/15/96 13 11 3654 -066 <0 5 <0 5 <0 5 <0 5 <50 120 r 3/14197 1320 -- 3645 -009 <0 5 <0 5 <0 5 <0 5 <50 6 3 0 10 614197 NP 1244 — 37.21 076 <0 5 <0 5 <0.5 <0.5 <50 <2.5 0 13 I 47471TABLES12093JUN7 XLS