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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 MRTE W-9 44.4 4123190 59.81 -15.41 -- 2000 320 12 3200 -- -- 10/02/90 65.95 -21.55 -6.14 770 120 <0.5 610 -- -- 1/29/91 62.48 -18.08 3.47 -- -- -- -- --2/1/91 -- -- -- 180 19 0.8 50 --3/15/91 61.82 -17.42 0.66 -- -- -- -- -- -- 4116/91 -- -- -- 440 120 1.4 130 830 -- 7/22191 64.91 -20.51 -3.09 4100 2.0 <0.5 11 1400 -- 10/22/91 66.13 -21.73 -1.22 150 <0.5 <0.5 2.8 420 2/10/92 63.31 -18.91 2.82 -- -- -- -- __ 2/11/92 -- -- -- 180 5/12/92 62.98 -18.58 0.33 14 <0.5 <0.5 <0,5 73 -- 8/18/92 68.07 -23.67 -5.09 14 <0.5 <0.5 <0.5 <50 -- 11/17/92 67.79 -23.39 0.28 <0.5 <0.5 <0.5 <0.5 <50 -- 2/23/93 65.43 -21.03 2.36 <0.5 <0.5 <0.5 <0.5 <50 -- 5/25/93 64.67 -20.27 0.76 5/26/93 <0.5 <0.5 <0.5 <0.5 <50 -- 8/23/93 69.12 -24.72 -4.45 <0.5 <0.5 <0.5 <0.5 <50 11/17/93 65.93 -21.53 3.19 <0.5 <0.5 <0.5 <0.5 <50 -- 3122/94 62.29 -17.89 3.64 <0.3 <0.3 <0.3 <0.5 <10 -- 6/23194 64.91 -20.51 -2.62 <0.3 <0.3 <0.3 <0.5 <10 -- 9/28/94 68.56 -24.16 -3.65 <0.5 <0.5 <0.5 <0.5 <50 12/19/94 66.10 -21.70 2.46 <0.5 <0.5 <0.5 <0.5 <50 -- 3/2/95 64.07 -19.67 2.03 <0.5 <0.5 <0.5 <0.5 <50 -- 5/18195 69.35 -24.95 (c) -5.28 -- -- -- -- --5/19/95 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- 8/10/95 6590 -21.50 3.45 <0.5 <05 <0.5 <0.5 <50 -- 11/17/95 64.93 -20.53 0.97 <0.5 <0.5 <0.5 <0.5 <50 <3 2/14/96 62.29 -17.89 2.64 <0.5 0.55 <0.5 5.0 <50 -- 5/9/96 61.70 -17.30 0.59 <0.5 <0.5 <0.5 <0.5 <50 -- 9/6/96 66.00 -21.60 -4.30 <0.5 <0.5 <0.5 <0.5 <50 <5 11/22/96 64.02 -19.62 1.98 <0.5 <0.5 <0.5 <0.5 <50 <5 338MAnt.ESA34NOWALS