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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 pgL and date in feet(a) in leet in feet in feet Benzene "Toluene Eth lbenzene Xylenes TPH-G MB TE 8/11195 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- 11/17/95 63.69 -20.91 0.42 2/14/96 60.51 -17.73 3.18 <0.5 0.51 <0.5 4.4 <50 -- 519/96 60.01 -17.23 0.50 -- -- -- -- __ 916/96 64.30 -21.52 -4.29 <0.5 <0.5 <0.5 <0.5 85 (c) <5 11/22/96 62.74 -19.96 1.56 -- -- -- -- __ _- W-12 42.45 4123/90 58.69 -16.24 -- <0.3 2.3 <0.3 0.9 -- -- 10/02/90 64.28 -21.83 -5.59 10/4/90 -- -- -- <0.5 <0.5 <0.5 <0.5. -- 1/29/91 61.00 -18.55 3.2$ 2/2/91 -- -- -- <0.5 <0.5 <0.5 <0.5 3/15/91 60.20 -17.75 0.80 4/17/91 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- 7/22/91 63.18 -20.73 -2.98 -- -- -- _ -- -_ 7/24/91 -- -- -- 6.9 <0.5 <0.5 <0.5 90 -- 10/22/91 64.50 -22.05 -1.32 10/23/91 -- -- 25 <0.5 <0.5 <0.5 100 2/10/92 61.77 -19.32 2.73 12 <0.5 <0.5 <0.5 95 5/12/92 61.31 -18.86 0.46 48 <0.5 <0.5 <0.5 170 8/18/92 66.09 -23.64 -4.78 29 <0.5 <0.5 <0.5 180 -- 11/17/92 66.27 -23.82 -0.18 II <0.5 <0.5 <0.5 <50 -- 2/22/93 63.97 -21.52 2.30 <0.5 <0.5 <0.5 <0.5 <50 -- 4123/93 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- 5/25/93 63.24 -20.79 0.73 5/26/93 -- <0.5 <0.5 <0.5 <0.5 <50 -- 8/23/93 67.03 -24.58 -3.79 <0.5 <0.5 <0.5 <0.5 <50 -- 11/16/93 65.14 -22.69 1.89 <0.5 <0.5 <0.5 <0.5 <50 -- 3/22/94 60.85 -18.40 4.29 <0.3 <0.3 <0.3 <0.5 <10 -- 6/23/94 63.39 -20.94 -2.54 <0.3 <0.3 <0.3 <0,5 <10 -- 9/28/94 66.83 -24.38 -3.44 <0.5 <0.5 <0.5 <0.5 <50 -- 12/19/94 64.78 -22.33 2.05 <0.5 <0.5 <0.5 <0.5 <50 -- 312195 62.57 -20.12 2.21 <0.5 <0.5 <0.5 <0.5 <50 5/18/95 60.88 -18.43 1.69 33821TABLEM434NOWALS