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l KLE/NF e.R RigMEc <br /> Bn➢Rt Rule. bluwru <br /> ' 4 DISCUSSION OF RESULTS <br /> 1 <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. Historical groundwater depth and elevation data from <br /> 2001 — 2010 has been archived and can be viewed on previous reports. The groundwater <br /> gradients were calculated using 3-point mathematical calculations. <br /> The groundwater in the Plant Area during the second quarter 2014 monitoring event was <br /> calculated to flow to the south, with a gradient of 0.007 ft/ft. Historically, the groundwater flow <br /> direction has ranged from northeast to southeast. A groundwater contour map for the plant area <br /> is included on Plate 3. <br /> The groundwater gradient in the N/SALAIA was towards the west, with a gradient of 0.003 ft/ft. <br /> A groundwater contour map for N/SALAIA is presented on Plate 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 /> Groundwater sample results were compared to regulatory limits found in the California <br /> Environmental Protection Agency, Central Valley Regional Water Quality Control Board, A <br /> 1 Compilation of Water Quality Goals (WQG's), 2011. <br /> 4.2.1 McKinley Avenue Rapid Infiltration Area (MARIA) <br /> Groundwater quality for the three monitoring wells for the second quarter 2014 had the <br /> following range of concentrations compared to the regulatory limits: <br /> 101486.7/SAC14R02453 Page 8 of 14 July 25, 2014 <br /> ©2014 Kleinfelder <br /> 1 <br />