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3.1 Groundwater Elevations, Flow Directions, and Hydraulic Gradients <br /> Table 4 summarizes groundwater elevation data for Second Quarter 2010. <br /> Table 4. Second Quarter 2010 Groundwater Elevations. <br /> Reference Depth toGround Groundwater <br /> Measured water Level Point Ground Water(feet water Elevation <br /> Well Name' By Measurement Elevation Elevation Change from <br /> below <br /> Date (feet MSL, reference (feet MSL, Previous <br /> NAVD 88) oint) NAVD 88) Quarter(feet) <br /> KMW-1 FGL Environmental, Inc. 5/3/2010 14.30 8.48 5.82 0.10 <br /> KMW-2 FGL Environmental, Inc. 5/3/2010 16.30 10.38 5.92 0.57 <br /> KMW-3 FGL Environmental, Inc. 5/3/2010 16.14 10.03 6.11 0.30 <br /> KMW-4 FGL Environmental, Inc. 5/3/2010 19.91 11.94 7.97 1.04 <br /> KMW-6 FGL Environmental, Inc. 5/3/2010 24.37 14.20 10.17 1.10 <br /> KMW-7 FGL Environmental, Inc. 5/3/2010 21.45 12.92 8.53 0.18 <br /> W-1 FGL Environmental, Inc. 5/3/2010 18.29 9.23 9.06 0.57 <br /> W-2 FGL Environmental, Inc. 5/3/2010 19.29 9.39 9.90 0.47 <br /> MW-5 FGL Environmental, Inc. 5/3/2010 13.29 8.17 5.12 -0.15 <br /> MBRMW-1 b HydroFocus, Inc. 4/21/2010 19.97 12.44 7.53 1.56 <br /> MBRMW-2b HydroFocus, Inc. 4/21/2010 20.07 12.92 7.15 1.71 <br /> MBRMW-3b HydroFocus, Inc. 4/21/2010 14.57 7.24 7.33 0.88 <br /> MBRMW-4b HydroFocus, Inc. 4/21/2010 20.13 12.93 7.20 1.10 <br /> a) The monitoring wells are constructed to represent conditions in the shallowest water-bearing zones. In <br /> general, the wells are 20 to 30 feet deep and have perforated intervals that range from 10-to 20-feet in total <br /> length. <br /> b) Groundwater levels in these wells provide supplemental data for developing contours beneath the <br /> Crossroads site (Figure 3). However, these wells are not part of the approved monitoring network utilized <br /> for the Crossroads site(they are approved for Lathrop's WRP-1 MBR monitoring network, which is regulated <br /> under a different WDR). <br /> Groundwater elevation contours are shown in Figure 3. Table 5 lists hydraulic <br /> head gradients calculated between selected monitoring well pairs. Water levels <br /> and hydraulic head gradients are expected to change temporally as a result of <br /> seasonal conditions and land disposal operations. <br /> Calculated gradients between selected well pairs monitor hydraulic gradients <br /> across the site. A positive gradient indicates that groundwater flow is away from <br /> the first well listed and toward the second well. A negative gradient indicates that <br /> groundwater flow is in the opposite direction, and water is moving away from the <br /> second well listed and toward the first well. <br /> Table 5. Hydraulic Gradients between Selected Monitoring Wells. <br /> Well Distance Gradient <br /> Location Number Between 1St Qtr 2nd Qtr Change <br /> Pair Wells 2010 2010 Absolute Description <br /> feet Magnitude <br /> Land Application KMW-6 3,360 0.0010 0.0013 0.0003 Increase <br /> Sites KMW-1 <br /> Storage Ponds KW-2 1,350 0.0027 0.0030 0.0003 Increase <br /> - 10 - <br />