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Treadwell&Rollo <br /> Table 1 A LANSAN LOMPANY <br /> Groundwater Vertical Gradients <br /> 423 N Madison Street <br /> Stockton, California <br /> Depth to Depth to <br /> Casing Screen Top Groundwater <br /> Well Date Elevation Screen Screen Elevation Elevation Vertical <br /> (feet MSL) Top Bottom (feet MSL) (feet) Gradient <br /> (feet bgs) (feet bgs) <br /> MW-19A 05/21/01 8.92 11 31 -2.08 -5.55 -0.05 <br /> 08/16/01 -6.15 -0.05 <br /> 11/14/01 -7.21 -0.05 <br /> 02/13/02 -6.43 -0.05 <br /> 05/15/02 -6.5 -0.05 <br /> 09/30/02 -7.35 -0.06 <br /> MW-19B _ 05/21/01 9.31 48.5 53.5 -39.19 -7.26 <br /> 08/16/01 -8.14 <br /> 11/14/01 -9.07 <br /> 02/13/02 -8.11 <br /> 05/15/02 -8.34 <br /> 09/30/02 1 -9.52 <br /> MW-20A 05/21/01 10.15 12 32 -1.85 -5.69 -0.04 <br /> 08/16/01 -6.29 -0.05 <br /> 11/14/01 -7.4 -0.04 <br /> 02/13/02 -6.63 -0.04 <br /> 05/15/02 -6.68 -0.04 <br /> 09/30/02 -7.54 -0.05 <br /> MW-20B 05/21/01 9.93 50 55 -40.07 -7.11 <br /> 08/16/01 -8.03 <br /> 11/14/01 -8.89 <br /> 02/13/02 -8.04 <br /> 05/15/02 -8.27 <br /> 09/30/02 -9.42 <br /> MW-21A 05/21/01 8.74 12 32 -3.26 -5.62 -0.04 <br /> 08/16/01 -6.19 -0.05 <br /> 11/14/01 -7.29 -0.05 <br /> 02/13/02 -6.51 -0.04 <br /> 05/15/02 -6.58 -0.05 <br /> 09/30/02 -7.44 -0.02 <br /> MW-21B 05/21/01 8.64 48 53 -39.36 -7.19 <br /> 08/16/01 -8.07 <br /> 11/14/01 -9.11 <br /> 02/13/02 -8.06 <br /> 05/15/02 -8.27 <br /> 09/30/02 -8.27 <br /> Notes: <br /> bgs- below ground surface MSL- mean sea level Source: AGE, 2002 <br /> 731589001_Tables Page 1 of 1 May 2013 <br />