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(KLKL E/NFELOER <br /> Bright People Fight Solutions. <br /> 4 DISCUSSION OF RESULTS <br /> The following sections discuss the groundwater characteristics and quality. <br /> 4.1 GROUNDWATER FLOW DIRECTION AND GRADIENT <br /> The depths to groundwater and groundwater elevations for each water level monitoring location <br /> are detailed on the attached Table 1. The groundwater gradients were calculated using 3-point <br /> mathematical calculations. <br /> The groundwater in the Plant Area during the first quarter 2015 monitoring event was calculated <br /> to flow to the south, with a gradient of 0.01 ft/ft. A groundwater contour map for the plant area is <br /> included on Figure 3. <br /> The groundwater gradient in the N/SLAIAs was towards the west, with a gradient of 0.005 ft/ft. <br /> A groundwater contour map for N/SLAIAs is presented on Figure 4. <br /> Groundwater flow direction in the MARIA was estimated to be towards the west based on <br /> relative elevations of groundwater in W-1, W-4, and W-5. A groundwater gradient was not <br /> calculated due to the linear orientation of the wells. <br /> 4.2 CHEMICAL ANALYSIS OF GROUNDWATER SAMPLES <br /> 4.2.1 McKinley Avenue Rapid Infiltration Area (MARIA) <br /> Groundwater quality for the three monitoring wells for the first quarter 2015 had the following <br /> ranges of concentrations: <br /> • pH (7.08 to 7.36 units) <br /> • Total Dissolved Solids (720 to 1200 mg/1) <br /> • Ammonia as Nitrogen (all Non-detectable <0.10 mg/1) <br /> • Nitrate as Nitrogen (Non-detectable <0.50 to 10 mg/1) <br /> • Total Kjeldahl Nitrogen (0.20mg/l to 0.0.50 mg/1) <br /> • TCO (Non-detectable, <1.1 to >23 MPN/100ml) <br /> 00101486.8/SAC15R19291 Page 11 of 17 May 6, 2015 <br /> ©2015 Kleinfelder <br />