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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2I33, Stockton, California I Tap-of-casing Depth-to- Product Water-level Change since Concentrations in L Well number elevation, feet water, thickness, elevation, last measurement, Total and date above mean sea level in feet in feet in feet(a) in feet Benzene Toluene Eth (benzene Xylenes. TPH-G MTBE MW-2 2 88 11/10/93 16 89 -- -1401 -- 67 72 6 6 120 950 -- 3/21/94 1644 -- -13 56 045 100 6 2 16 83 450 -- 6127194 1629 -1341 0 15 55 13 9 6 72 390 -- 9/29/94 -- -- -- -- -- -- -- -- 12/8/94 1543 -- -1255 086 29 27 6 2 130 580 -- 318195 2 54 1297 -- -- 180 42 89 370 3800 6/l/95 -- 9/11/95 -9111/95 13 74 -- -- -- 290 51 140 170 4100 -- 12/5/95 1 15 14 10 -- -1295 .036 -- -- __ _- -- 3118/96 860 -- -745 5 50 250 18 56 280 4800 6/18/95 961 -- -846 -1 01 -- -- __ __ _- ._ 9/25/96 1220 -- -1 1 05 -259 2 7 <0 5 3 18 120 <5 1214196 11 78 -- -10 63 042 -- -- __ -- MW-3 _MW-3 231 3/8/95 14 18 -- -11 87 -- <0 5 <0 5 <0 5 <0 5 <50 -- 6/1/95 12 55 -- -1024 1 63 <0 5 <0 5 <0 5 <0 5 <50 9111/95 14 84 -- -12 53 -229 <0 5 <0 5 <0 5 <0 5 <50 -- 12/5195 1520 -- -1289 -036 -- -- _- __ -- 3/18/96 _3/18196 1075 -- -844 445 <0 5 <0 5 <0 5 <0 5 <50 -- 6/18/95 11 05 -- -874 -030 -- -- -- ._ -- -- 9/25/96 13 51 -- -1120 -246 <0 5 <0 5 <0 5 <0 5 <50 <5 112/4/96 1282 -- -1051 069 -- -- __ -.. -- MW-4 _MW-4 2 54 3/8/95 1431 -- -11 77 -- <0 5 <0 5 <0 5 <0 5 <50 -- 6/2/95 1286 -- -1032 1 45 <0 5 <0 5 <0 5 <0 5 <50 9/11/95 15 04 -- -1250 -2 18 <0 5 <0 5 <0 5 <0 5 <50 -- 12/5/95 1546 -- -1292 -042 <0 5 <0 5 <0 5 <0 5 <50 -- 3/18/96 1025 -- -7 71 521 <0 5 <0 5 <0 5 <0 5 58 -- 6/18/96 1 l 23 -- -869 -098 <0 5 <0 5 <0 5 <0 5 <50 <5 9/25/96 1365 -- -I 1 11 -242 <0 5 <0 5 <0 5 <0 5 <50 <5 1214196 1305 -- -1051 060 <0 5 <0 5 <0 5 <0 5 <50 <5 331617 ABLES12133DEC6 XLS