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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2093, Tracy, California W7Floating Change Concentrations in 1►g/L In Top-of-casing Depth-to- product Water-level since last Well number elevation, water, thickness elevation, measurement, Total date in feet(a) to feet in feet in feet(b) in feet Benzene Toluene Eth (benzene Xylenes TPH-G MTBE DO 2/28/95 845 002 3754 024 4/26195 8 51 050 3782 006 -- 7/27/95 9 85 0 12 3621 134 -- 10/26/95 928 003 3672 -057 -- - 2/12/96 7 87 002 38 12 -141 4/18/96 845 0 02 3754 058 -- -- -- -- -- -- -- 7/18/96 8 95 -- 3703 050 72 220 620 2500 88000 <500 11/15/96 940 -- 3658 045 110 130 240 1300 52000 <200 3/14/97 NP 924 3674 -0 16 4 2 <0 5 1 6 26 350 <2 5 0 ]{) 6/4/97 NP 869 -- 3729 -0 55 42 5 2 8 2 150 1200 <2 5 003 8/11/97 NP 9 10 -- 3688 041 280 75 140 710 7800 <25 0 15 11/17/97 NP — — -- — 57 <0 5 <0 5 250 4200 <2 5 -- ATR-9 10/16/90 4868 -- -- _- <0 5 <0 5 <0 5 <0 5 <50 10/19/90 11 11 -- 3757 -- 1110/91 1104 3764 -007 <0 5 <0 5 <0 5 <0 5 <50 -- -- 4/10/91 10 82 -- 3786 -022 <0 5 <0 5 <0 5 <0 5 <50 -- 7/10191 1106 -- 3762 024 <0 5 <0 5 <0 5 <0 5 <50 -- 9/24/91 11 29 -- 37 39 023 __ _ _ -- 9/25/91 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 1/23/92 10 96 3772 -- <0 5 <0 5 <0 5 <0 5 <50 -- 4/20/92 1088 -- 3780 -008 -- -- 4/21/92 -- -- -- -- <0 5 <0 5 <0 5 <{1 5 <50 -- 7/8/92 11 06 -- 3762 -- <0 5 <0 5 <0 5 <0 5 <50 -- 10/7192 11 16 -- 3752 0 10 <0 5 <0 5 <0 5 <0 5 <50 -- 1/18/93 1034 -- 38 34 -0 82 <0 5 <0 5 <0 5 <0 5 <50 _- 4/14193 1070 -- 3798 0 36 <0 5 <0 5 <0 5 <0 5 <50 -- 8/30/93 11 17 -- 3751 047 <0 5 <0 5 <0 5 <0 5 <50 - -_ 10/27/93 1123 -- 37.15 006 <0 5 <0 5 <0 5 0 7 <50 -- 2/17/94 1089 -- 3779 -034 _. __ 2118/94 -- -- -- -- <0 3 0 4 <0 3 <0-5 <10 5120/94 1097 -- 3771 -- <0 3 <{13 <0 3 <0 5 <10 '- 1017/94 11 19 -- 3749 022 <0 5 <0 5 <0 5 <0 5 <50 _- 12/16/94 10 91 37 77 -028 <0 5 <0 5 <0 5 <0 5 <50 47471T BLLS12093NOV7 XLS