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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 434, Lodi, California Top-of-casing Depth-to- Water-level Change since Well number elevation, water, elevation, last measurement, Concentrations in L and date in feet(a) in feet in feet in feet Benzene Toluene Eth ]benzene Xylenes TPH-G MBTE 7/22/91 63.57 -20.86 -3.24 <0.5 <0.5 <0.5 <0.5 60 -- 10/22/91 64.68 -21.97 -1.11 <0.5 <0.5 <0.5 <0.5 <50 -- 2/10/92 61.83 -19.12 2.85 <0.5 <0.5 <0.5 <0.5 <50 5/12/92 61.50 -18.79 0.33 <0.5 <0.5 <0.5 <0.5 <50 8/18/92 66.75 -24.04 -5.25 <0.5 <0.5 <0.5 <0.5 <50 -- 11/16/92 66.32 -23.61 0.43 <0.5 <0.5 <0.5 <0.5 <50 -- 2/22/93 63.84 -21.13 2.48 2123193 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- 5/25/93 62.79 -20.08 1.05 <0.5 <0.5 <0.5 <0.5 <50 -- 8/23/93 67.81 -25.10 -5.02 <0.5 <0.5 <0.5 <0.5 <50 11/16/93 64.47 -21.76 3.34 <0.5 <0.5 <0.5 <0.5 <50 -- 3/22/94 60.86 -18.15 3.61 <0.3 <0.3 <0.3 <0.5 <10 -- 6/23/94 63.69 -20.98 -2.83 <0.3 <0.3 <0.3 <0.5 <10 -- 9128/94 67.08 -24.37 -3.39 <0.5 <0.5 <0.5 <0.5 <50 -- 12/19/94 64.58 -21.87 2.50 <0.5 <0.5 <0.5 <0.5 <50 -- 3/2/95 62.52 -19.81 2.06 <0.5 <0.5 <0.5 <0.5 <50 5/18/95 60.74 -18.03 1.78 <0.5 <0.5 <0.5 <0.5 <50 8/10/95 64.52 -21.81 -3.78 <0.5 <0.5 <0.5 0.7 <50 -- 11/17/95 63.53 -20.82 0.99 2114196 60.85 -18.14 2.68 1.3 2.9 0.53 17 68 -- 5/9/96 60.40 -17.69 0.45 916196 64.73 -22.02 -4.33 <0.5 <0.5 <0.5 <0.5 <50 <5 11/22/96 62.78 -20.07 1.95 W-3 42.48 4/10/87 -- -- -- 30000 38000 1800 14000 180000 -- 4/15/87 48.70 -6.22 7/20/87 54.37 -11.89 -5.67 7/23/87 -- -- -- 12000 23000 2400 15500 227300 -- 11/13/87 -- -- -- 3400 3200 2700 8500 176900 11/18/87 54.02 -11.54 0.35 2/8/88 52.08 -9.60 1.94 6/24/88 58.72 -16.24 -6.64 9128/88 55.40 -12.92 3.32 10/3/88 -- -- 10.3 14.8 1.9 9.5 -- -- 3382WA13LESA34NOWALS