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3.1 Groundwater Elevations, Flow Directions, and Hydraulic Gradients <br /> Table 4 summarizes groundwater elevation data for Third Quarter 2009. <br /> Table 4. Third Quarter 2009 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. 7/27/09 14.30 9.85 4.45 -0.21 <br /> KMW-2 FGL Environmental, Inc. 7/27/09 16.30 12.30 4.00 -0.46 <br /> KMW-3 FGL Environmental, Inc. 7/27/09 16.14 11.61 4.53 -0.19 <br /> KMW-4 FGL Environmental, Inc. 7/27/09 19.91 13.16 6.75 0.29 <br /> KMW-6 FGL Environmental, Inc. 7/27/09 24.37 15.30 9.07 0.59 <br /> KMW-7 FGL Environmental, Inc. 7/27/09 21.45 13.87 7.58 -0.21 <br /> W-1 FGL Environmental, Inc. 7/27/09 18.29 11.47 6.82 -0.59 <br /> W-2 FGL Environmental, Inc. 7/27/09 19.29 12.00 7.29 -0.97 <br /> MW-5 FGL Environmental, Inc. 7/27/09 13.29 8.70 4.59 -0.40 <br /> MBRMW-1 b HydroFocus, Inc. 7/27/09 19.97 14.39 5.58 -0.89 <br /> MBRMW-2 b HydroFocus, Inc. 7/27/09 20.07 14.79 5.28 -0.79 <br /> MBRMW-3b HydroFocus, Inc. 7/27/09 14.57 9.67 4.90 -0.97 <br /> MBRMW-4b HydroFocus, Inc. 7/27/09 20.13 14.05 6.08 -0.25 <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)Wells are not part of the approved monitoring network for the Crossroads site. These wells are approved <br /> for Lathrop's WRP-1 MBR monitoring network(regulated under a different WDR)and therefore groundwater <br /> levels in these wells are used to provide supplemental data for developing contours beneath the Crossroads <br /> site (Figure 3). <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 2nd Qtr 3rd Qtr Change <br /> Pair Wells 2009 2009 Absolute Description <br /> feet Magnitude <br /> Land Application KMW-6 3,360 0.0011 0.0014 0.0003 Increase <br /> Sites KMW-1 <br /> Storage Ponds KW-2 1,350 0.0027 0.0021 0.0006 Decrease <br /> - 10 - <br />