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t r <br /> KLE/NFELDER <br /> B9M1 PoPI xynsi <br /> n e o e. 1 t a wane <br /> 4 DISCUSSION OF RESULTS <br /> The following sections discuss the groundwater characteristics and quality. <br /> 4.1 GROUNDWATER FLOW DIRECTION AND GRADIENT <br /> 1 The 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 /> 1 calculated using 3-point mathematical calculations. <br /> The groundwater in the Plant Area during the third quarter 2011 monitoring event was <br /> calculated to flow to the south/southeast with a gradient of 0.005 ft/ft. Historically, the <br /> groundwater flow direction has ranged from northeast to southeast. A groundwater <br /> gradient map for the Plant area is included as Plate 3. <br /> The gradient in the McKinley Avenue Rapid Infiltration Area during the third quarter <br /> 2011 monitoring event was estimated to be towards the west with a gradient of about <br /> 0.02 ft/ft (Plate 4). The gradient could not be accurately calculated due to the current, <br /> near linear well arrangement. The groundwater gradient in the Louise Avenue <br /> ' Infiltration Area was towards the west/southwest with a gradient of approximately 0.005 <br /> 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 /> Third Quarter 2011 had the following ranges of concentrations: <br /> pH (7.23 to 7.39 units) <br /> Total Dissolved Solids (740 to 1,200 mg/1) <br /> ' • Ammonia as Nitrogen (Non-detectable, <0.10 mg/1) <br /> 101486.4/ST011R242 Page 11 of 17 October 31, 2011 <br /> Copyright 2011 Kleinfelder <br />