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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2093, Tracy, California Top-of-casing Depth-to- Floating Water-level Change since Concentrations in /L Well number elevation, water, product thickness elevation, last measurement, Total and date in feet(a) in feet in feet in feet(b) in feet Benzene Toluene Eth lbenzene Xylenes TPH-G MTBE 2118/94 12.00 -- 37.93 0.39 200 27 120 140 1900 -- 5/20/94 12.07 Sheen 37.86 -0.07 -- -- -- __ __ 10/7/94 12.38 Sheen 37.55 -0.31 12/16/94 12.03 Sheen 37.90 0.35 2/28/95 12.05 0.03 37.90 0.00 4/26/95 12.32 Sheen 37.61 -0.29 7/27/95 12.51 -- 37.42 -0.19 10/26/95 (c) 12.97 -- -- -0.46 2/12/96 12.10 -- -- 0.87 89 <0.5 43 150 1500 -- 4/18/96 12.60 -- -0.50 -- -- -- -- __ -- 7/18/96 12.60 -- 0.00 26 5.2 70 51 1600 1800 11/15/96 13.40 -- -- -0.80 -- -- -- -- -- -- ATR-4 4/23187 49.03 10.85 -- 38.18 -- 3000 200 <10 950 21000 -- 12/22/87 11.00 -- 38.03 -0.15 5300 310 430 270 -- -- 3/24/88 10.98 -- 38.05 0.02 5800 320 930 740 6000 -- 6/23/88 12.11 -- 36.92 -1.13 237 8.8 2 10 5200 -- 9/29/88 10.72 -- 38.31 1.39 1430 115 350 130 1400 -- 2/22/89 1091 -- 38.12 -0.19 1300 82 54 170 22000 -- 6/29/89 11.00 -- 38.03 -0.09 590 38 97 220 1300 -- 9/18/89 11.19 -- 37.84 -0.19 280 13 49 100 630 -- 12/28/89 11.08 -- 37.95 0.11 500 25 56 160 1300 -- 4/18/90 11.25 -- 37.78 -0.17 150 5.1 35 63 440 -- 10/16/90 11.38 -- 37.65 -0.13 26 41 4.8 0.38 380 -- 1/10/91 11.16 37.87 0.22 150 3.1 30 35 330 -- 4/10/91 10.99 -- 38.04 0.17 8.4 <0.5 <0.5 24 500 -- 7/10/91 11.32 -- 37.71 -0.33 39 <0.5 3.7 3 190 -- 9/24/91 11.57 -- 37.46 -0.25 22 <.05 4.2 1.5 70 -- 1/23/92 11.16 -- 37.87 0.41 300 5.2 49 72 1200 -- 4/20/92 11.12 -- 37.91 0.04 -- -- __ __ 4121192 -- -- -- -- 150 <5 36 29 560 -- 7/8/92 11.31 -- 37.72 -0.19 150 2.1 36 39 590 -- 1017192 11.45 -- 37.58 -0.14 -- __ __ __ 33151TAB LES12093NOV6.X LS