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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2093, Tracy, California Top-ol=easing Depth-to- F^loaling Water-level Change since Concentrations in t gL 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 (benzene Xylenes TPH-G MTBE 2128195 11.60 -- 37.62 -0.04 <0.5 <0.5 <0.5 <0.5 <50 -- 4/25/95 11.95 37.27 -0.35 <0.5 <0.5 <0.5 <0.5 <50 -- 7/27/95 12.91 -- 36.31 -0.96 <0.5 <0.5 <0.5 <0.5 <50 -- 10/26/95 12.26 36.96 0.65 <0.5 <0.5 <0.5 <0.5 <50 -- 2/12/96 11.40 -- 37.82 0.86 <0.5 <0.5 <0.5 <0.5 <50 -- 4/18/96 11.90 -- 37.32 -0.50 <2.5 <2.5 <2.5 <2.5 <250 -- 7/18/96 12.10 -- 37.12 -0.20 <0.5 <0.5 <0.5 <0.5 <50 500 11/I5/96 12.70 -- 36.52 -0.60 <0.5 <0.5 <0.5 <0.5 <50 750 ATR-3 4123187 49.93 11.79 -- 38.14 -- 2300 180 <5.0 2300 17000 -- 12/22/87 11.93 -- 38.00 -0.14 5000 50 530 250 -- -- 3/24/88 12.58 -- 37.35 -0.65 8300 8700 4400 7800 43000 -- 6/23/88 11.17 -- 38.76 1.41 6160 4221 1800 4750 70000 -- 9/29/88 12.23 -- 37.70 -1.06 8850 17600 2190 8170 57400 -- 2/22/89 11.82 -- 38.11 0.41 1000 2100 480 2000 110000 -- 6/29/89 -- -- -- -- 890 520 250 1100 4500 -- 9/18/89 12.19 -- 37.74 -0.37 1000 1300 460 2200 7400 -- 12/28/89 12.01 -- 37.92 0.18 840 1400 840 5600 27000 -- 4/18/90 12.15 -- 37.78 -0.14 1000 490 340 1500 4800 -- 10/16/90 12.35 -- 37.58 -0.20 1900 1300 780 4600 14000 -- 10/19/90 12.28 -- 37.65 0.07 1/10/91 12.01 -- 37.92 0.27 610 230 160 670 2600 -- 4/10/91 11.82 -- 38.11 0.19 910 120 110 190 3000 -- 7/10/91 12.23 -- 37.70 -0.41 420 300 340 760 19000 -- 9/24/91 12.57 -- 37.36 -0.34 280 81 69 130 2000 -- 1/23192 12.12 Sheen 37.81 0.45 4/20192 11.93 Sheen 38.00 0.19 7/8/92 12.22 Sheen 37.71 -0.29 1017/92 12.38 Sheen 37.55 -0.16 1/18/93 11.22 Sheen 38.71 1.16 4114193 11.49 Sheen 38.44 -0.27 8130/93 12.43 Sheen 37.50 -0.94 10/27/93 12.39 Sheen 37.54 0.04 33151TABLES12093N0V6.XLS