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9 0 , Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2093, Tracy, California Floating Change Concentrations in µg/L iii Top-of-casing Depth-to- product Water-levet since last Well number elevation, water, thickness elevation, measurement, Total and date in feet(a) in feet in feet in feet (b) in feet Benzene Toluene Eth /benzene Xylenes TPH-G MTBE DO 7/18/96 945 -- 37 39 0 42 <0 5 <0 5 <0 5 <0 5 <50 <5 11/15/96 995 -- 3689 050 -- -- -- 3/14/97 NP 986 -- 3698 -009 <0 5 <0 5 <0 5 <0 5 <50 -- 0 15 6/4197 924 -- 3760 -0 62 -- -- -- -- -- -- 008 8/11/97 NP 963 -- 3721 039 <0 5 <0 5 <0 5 <0 5 <50 <2 5 0 37 11/17/97 947 -- 3737 -0 16 -- -- _- ATR-12 10/16/90 4708 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 10/19/90 933 -- 37 75 -- -- -- -- _ 1/10/91 9 16 -- 3792 -0 17 <0 5 <0 5 <0 5 <0 5 <50 -- 4/10/91 898 -- 38 10 -018 <0 5 <0 5 <0 5 <0 5 <50 -- -- 7/12/91 928 -- 3780 030 <0 5 <0 5 <0 5 <0 5 <50 - 9/24/91 952 -- 3756 024 -- _- -- _ -- 9/25/91 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 -- _- 1/23/92 906 -- 3802 -- <0 5 <0 5 <0 5 <0 5 <50 -- 4/20/92 900 -- 3808 -006 -- -- -- 4/21/92 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 -- 7/8/92 921 -- 37 87 -- <0 5 <}5 <0 5 <0 5 <50 10/7/92 932 -- 3776 0 11 <0 5 <0 5 <0 5 <0 5 <50 1/18/93 832 -- 3876 -100 <0 5 <0 5 <0 5 <0 5 <50 -- -- 4/14/93 879 -- 3829 047 <0 5 <0 5 <0 5 <0 5 <50 -- -- 8131/93 939 -- 3769 0 60 <0 5 <0 5 <0 5 <0 5 <50 -- 10/27/93 936 3772 -0 03 <0 5 <0 5 <0 5 <0 5 <50 2/18/94 902 -- 3806 -034 0 4 0 5 <0 3 <0 5 <10 5120194 906 -- 3802 004 <0 3 <0 3 <0 3 <0 5 <10 1017/94 __ 12/16/94 -- -- -- -- -- -- 2128195 -_ _- -- -- -- -- -- -- -- -- -- -- 4/25/95 -- -- -- -- -- -- -- -- -- 4126/95 7/27/95 - 10/26/95 -- __ __ 2112(96 8 85 -- 38 23 -- <0 5 <0 5 <0 5 <0 5 <50 -- -- 4118/96 922 -- 37 86 037 <0 5 <0 5 <0 5 <0 5 <50 -- -- 47471TABLLSQ093NOV7 XIS