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KLE/NF-ELDER <br /> • \ Bri9Ft FtePle.fli9ht5olutuni. <br /> silts and clays present, the sporadic occurrence of the perched groundwater may <br /> suggest multiple areas of perched groundwater conditions. This is also consistent with <br /> an alluvial and overbank depositional environment. Therefore, channel deposits would <br /> be sporadic in their occurrence and generally be within finer grained overbank <br /> sediments. Additionally, the reason for high concentrations of nitrate above the MCL <br /> upslope (east) of the nursery is unknown, but may be indicative of other sources of <br /> nitrates in shallow groundwater or regional groundwater quality problems. <br /> 5.1.3 Deep "Main" Aquifer <br /> Depth-to-water in the three deep monitoring wells during the third quarter monitoring <br /> event ranged from 144.36 (DP-2) to 156.72 (DP-1) feet below the tops of the monitoring <br /> well casings. The groundwater elevations ranged from -22.44 (DP-3) to -16.18 (DP-1) <br /> feet msl. <br /> Depth-to-water in the three deep monitoring wells during the third quarter monitoring <br /> event ranged from 145.15 (DP-2) to 157.43 (DP-1) feet below the tops of the monitoring <br /> • well casings. The groundwater elevations ranged from -22.44 (DP-3) to -16.18 (DP-1) <br /> feet msl. <br /> The gradient of the deep, "main" aquifer was calculated between wells DP-1 and DP-3 <br /> using a "3-point analysis." During both quarterly monitoring events, flow direction in the <br /> deep, "main" aquifer was to the southwest at a gradient of 0.003 feet/foot, consistent <br /> with the San Joaquin Flood Control and Water Conservation District data cited in this <br /> report, and with Kleinfelder's site-specific historical data. For additional historical <br /> information regarding the depth-to-groundwater and corresponding groundwater <br /> elevations, please refer to Table 7 in the Appendices. Groundwater contours for the <br /> monitoring event are included as Plate 3. <br /> During the first quarter 2012, Nitrate as N was detected in each of the three deep <br /> groundwater samples at concentrations ranging from 1.3 mg/I (DP-1) to 8.3 mg/I (DP-2). <br /> During the second quarter 2012, Nitrate as N was detected in each of the three deep <br /> groundwater samples at concentrations ranging from 1.4 mg/I (DP-1) to 6.6 mg/I (DP-2). <br /> • <br /> 117226.E02/ST012R0696 Page 24 of 43 September 14, 2012 <br /> Copyright 2012 Kleinfelder <br />