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r <br /> DER <br /> 4. <br /> �BryM Xuple.N9ht5olufiam. <br /> 4. DISCUSSION OF RESULTS <br /> The following sections discuss the groundwater gradient and chemical analysis for soil <br /> ' and groundwater. <br /> 4.1 GROUNDWATER FLOW DIRECTION AND GRADIENT <br /> rThe depths to groundwater and groundwater elevations for each water level monitoring <br /> location are detailed on the attached Table 1. The groundwater gradients were <br /> calculated using 3-point mathematical calculations and/or an extrapolation of elevation <br /> ' contours between data points. <br /> The groundwater in the Plant Area during the fourth quarter 2011 monitoring event was <br /> calculated to flow to the north with a gradient of .01 ft/ft. Historically, the groundwater <br /> flow direction has ranged from northeast to southeast. A groundwater contour map for <br /> the Plant area is included as Plate 3. <br /> rThe gradient in the McKinley Avenue Rapid Infiltration Area during the fourth quarter <br /> 2011 monitoring event was estimated to be towards the south. The gradient could not <br /> ' be calculated due to the current linear well arrangement. The groundwater gradient in <br /> the Louise Avenue Infiltration Area was towards the south/southwest with a gradient of <br /> approximately 0.004 ft/ft (Plate 4). <br /> 4.2 CHEMICAL ANALYSIS OF GROUNDWATER SAMPLES <br /> 4.2.1 McKinley Avenue Rapid Infiltration Area <br /> Groundwater quality for the three monitoring wells in the Rapid Infiltration Area for the <br /> ' Fourth Quarter 2011 had the following ranges of concentrations: <br /> pH (7.07 to 7.31 units) <br /> Total Dissolved Solids (650 to 810 mg/1) <br /> ' . Ammonia as Nitrogen non-detectable <0.20 mg/I <br /> 101486.4/ST012R025 Page 11 of 20 February 1, 2012 <br /> Copyright 2012 Kleinfelder <br />