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DER <br /> ht Br19M1f hcPk.Fi9ht SalufMu <br /> 5. DISCUSSION OF ANNUAL TRENDS (2011) <br /> ' 5.1 GROUNDWATER FLOW DIRECTION AND GRADIENT <br /> The depths to groundwater, groundwater elevations, and gradients for each of the water <br /> level monitoring events are detailed on Tables 1 and 2. The groundwater flow directions <br /> and gradients noted at the site throughout 2011 were generally consistent with previous <br /> findings. <br /> In the Plant Area north of the McKinley Avenue land application areas near Lathrop <br /> Road, the groundwater flow direction during 2011 was predominantly south/southeast <br /> with gradients ranging from 0.0069 to 0.012 ft/ft. During the last quarter, the gradient <br /> was 0.01 ft/ft. The flow directions are generally consistent with those noted with <br /> historical monitoring. <br /> Groundwater flow directions in the McKinley Rapid Infiltration Area were generally west <br /> throughout 2011 with one quarterly result showing the flow direction to the south. The <br /> flow directions and gradients were generally consistent with previous monitoring events. <br /> ' The groundwater flow directions in the North and South-Louise Avenue Application <br /> Areas ranged from the west to south/southwest with gradients ranging from 0.0027 to <br /> 0.004 ft/ft. The flow directions and gradients were generally consistent with previous <br /> findings. <br /> 5.2 CHEMICAL ANALYSIS OF GROUNDWATER SAMPLES <br /> 5.2.1 McKinley Avenue Rapid Infiltration Area <br /> ' Groundwater quality during 2011 for the monitoring wells in the McKinley Avenue Rapid <br /> Infiltration Area had the following ranges of concentrations: <br /> ' . pH (7.07 to 7.41) <br /> Total Dissolved Solids (650 to 1300 mg/1) <br /> Ammonia as Nitrogen (Non-detectable, < 0.20 mg/1) <br /> Nitrate as Nitrogen (Non-detectable, <0.50 to 37 mg/1) <br /> 101486.41ST012R025 Page 14 of 20 February 1, 2012 <br /> Copyright 2012 Kleinfelder <br />