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Table 1. Summa of Groundwater Summary Moni�orin Data: Water Elevations � and Analyses ARCO Facility 2093, Tracy, California Floating I Change Concentrations inµg/l, Im 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(b) in feet Benzene Toluene Eth lbenzene X lenes TPH-G MTBE DO 10/27/93 1239 Sheen 3754 004 2118194 1200 3793 039 200 27 120 140 1900 -- -- 5120/94 1207 Sheen 37 86 -007 -- __ - 1017194 1238 Sheen 3755 -031 12/16/94 12 03 Sheen 3790 035 2128/95 1205 003 3790 -002 4/26/95 1232 Sheen 3761 -027 7/27195 1251 3742 -0 19 -- __ -- -- -� 10/26/95 (c) 12 97 -- __ -046 2112/96 12 10 -- -- 087 89 <0 5 43 150 1500 --4/18/96 1260 -- -- -050 7/I8/96 1260 -- -- 000 26 5 2 70 51 1600 1800 11/15/96 1340 -- -0 80 -- 3/14/97 1334 -- -- 006 10 <0 5 43 19 1200 620 0 05 6/4/97 12,70 -- — 064 -- -- -- -- -- -- 0 15 ATR-4 4/23187 4903 10 85 -- 3818 -- 3000 200 <10 950 21000 12/22/87 1100 -- 3803 -0 15 5300 310 430 270 3/24/88 1098 -- 3805 0 02 5800 320 930 740 6000 6/23188 12 11 -- 3692 -1 13 237 8 8 2 10 5200 -- 9129188 1072 -» 3831 139 1430 115 350 130 I400 2122189 10 91 -- 38 12 -0 19 I300 82 54 170 22000 6129189 11 00 -- 3803 -009 590 38 97 220 1300 9118189 11 19 -- 37 84 -019 280 13 49 100 630 -_ 12/28/89 11 08 -- 3795 0 11 500 25 56 160 1300 4118/90 1125 3778 -017 150 5 1 35 63 440 10/16/90 1138 -- 3765 -0 13 26 41 4 8 038 380 1110191 11 16 -- 3787 022 150 3 1 30 35 330 4110/91 1099 -- 3804 0 17 8 4 <0 5 <0 5 24 500 7110/91 1132 -- 3771 -033 39 <0 5 3 7 3 190 9/24/91 1157 -- 3746 -025 22 <05 4 2 15 70 ^_ 1123/92 11 16 -- 3787 041 300 52 49 72 1200 -y 4120192 11 12 -- 3791 004 4121192 _.. __ '- -- -- 150 <5 36 29 560 4747GABLES12093RJN7 XLS