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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2093, Tracy, California Floating Change Concentrations inµg/L m lidin Depth-to- product Water-level since last Well number water, thickness elevation, measurement, Total and date feet in feet in feet(b) in feet Benzene Toluene Ethylbenzene Xylenes TPH-G MTBE DO 4118/96 12 90 -- 3768 060 -- _ _ 7118196 13 28 -- 3730 038 <0 5 <0-5 <0 5 <0 5 <50 <5 -- 11/15/96 13 74 -- 3684 046 -- 3/14/97 NP 1368 -- 36 90 -0 06 <0 5 <0 5 <0 5 <0 5 <50 614/97 1304 37 5.1 -064 _ -- 0 30 __ -- "- -- -- 022 8111197 NP 13 43 3715 039 <05 <05 <05 <05 <50 23 066 11/17/97 1329 3729 -0 14 -_ -- ATR-2 4123/87 4922 11 28 -- 3794 -- <0 5 0 6 <0 5 <0 5 <100 12/22/87 1140 -- 3782 0 12 <0 5 <0 5 <0 5 <0 5 _ -- 3/24/88 11 35 3787 -0 05 <0 5 <0 5 <0 5 <0 5 - -- 6/23/88 1155 3767 020 <0 5 <0 5 <0 5 <0 5 -- 9/29/88 1171 3751 0 16 <0 5 <0 5 <0 5 <0 5 -- 2/22/89 11 35 -- 3787 -036 1 8 0 7 0 6 3 4 370 -_ 6/21/89 11 45 -- 3777 0 10 1 9 <0 3 0 4 <0 3 <50 _- 9/18/89 1165 -- 3757 020 19 0 9 1 1 8 2 9 -- 12/27/89 1150 -- 3772 -0 15 3 5 <0 3 l 1 0 3 <50 _ 4/18/90 11 64 -- 3758 0 14 2 9 <0 3 <0 3 <0 3 50 _- 10/16/90 11 81 -- 3741 0 17 <0 5 <0 5 <0 5 <0 5 <50 -_ 10/19/90 11 81 -- 3741 0 00 1/10/91 11 58 -- 3764 -023 0 8 <0 5 <0 5 <0 5 <50 -- 4/10/91 11 35 -- 3787 -023 7/10/91 11 74 -- 37 .18 039 <0 5 <0 5 <0 5 0 5 <50 -- 9/24/91 12 02 -- 3720 028 <0 5 <0 5 <0 5 <0 5 <50 -. 1123192 11 60 -- 3762 -042 <0 5 <0 5 <0 5 <0 5 <50 ._ 4120/92 1153 -- 3769 -007 <0 5 <0 5 <0 5 0 5 <50 -- 7/8/92 11 75 -- 37.17 022 2 8 <0 5 <0 5 <15 <50 10/7/92 11 83 -- 3739 008 5 7 <0 5 <0 5 <0 5 59 �- 1/18/93 -- -- 4114/93 11 29 3793 -- 3 8 0^7 0 8 19 55 _- 8/30/93 11 96 -- 3726 067 <0 5 <0 5 <0 5 <0 5 <50 - 10/27/93 11 95 -- 3727 -001 <0 5 <0 5 <0 5 <0 5 <50 - -- 2/18/94 11 54 3768 -0 41 0 7 0 9 <0 3 0 7 <10 -- 5120194 11 61 -- 3761 007 0 9 <0 3 <0 3 <0 5 <1U 474711 ABLES12093NOV7 ALS