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KLE/NFELOER <br /> �envmvN+v�•.wgnt5owtion+ <br /> The gradient of the deep, "main" aquifer was calculated between wells DP-1 and DP-3 <br /> using a "3-point analysis." During the quarterly monitoring event, 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 fourth quarter 2011, 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 8.5 mg/I (DP-2). <br /> The results of the groundwater analyses were generally consistent with historical <br /> results. The pattern of nitrate concentration distribution relative to the deep aquifer flow <br /> direction appears to indicate that the highest nitrate concentrations exist north <br /> (upgradient) of the nursery. Nitrate as N concentrations in the upgradient location (DP- <br /> 2) have been increasing over time. <br /> For additional information regarding the results of chemical analysis, please refer to the <br /> laboratory data sheets in Appendix C or the summary of the results of the analyses <br /> included as Table 8 in the appendices of this report. Table 9 shows historical <br /> concentrations of nitrates (converted to nitrates as NO3) in the following wells, which <br /> draw water from the deeper aquifer: <br /> ■ . Norman's Nursery Old Main Well (now the backup irrigation well) <br /> Norman's New Main Well (irrigation) <br /> Dodge Well <br /> • Eason Well <br /> Barbagelata Irrigation Well <br /> Norman's DP-1 <br /> Norman's DP-2 <br /> Norman's DP-3 <br /> The sampling of the offsite wells has at times been conducted by the Stockton East <br /> Water District (SEWD) and nearby neighbors. Kleinfelder has not been provided with <br /> 117226.E021ST012R0693 Page 24 of 42 September 11, 2012 <br /> Copyright 2012 Kleinfelder <br />