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t KLEINFELDER <br /> ' e qn v.oek.w+gnesaoaon:. <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 /> any results by SEWD or others since the December 18, 2000 SEWD sampling. <br /> Kleinfelder has conducted the sampling of the three onsite deep aquifer monitoring <br /> wells. The sampling of the onsite production wells was primarily conducted by others for <br /> the nursery's neighbors. Review of Chart 10 shows a seasonal trend in the Dodge well. <br /> No other trends, seasonal or otherwise, can be ascertained from the data over time. <br /> The highest concentrations, with few exceptions, have generally been from the Eason <br /> well. According to San Joaquin County Flood Control and Water Conservation District <br /> reports and the deep aquifer gradients calculated by Kleinfelder's monitoring of DP-1 <br /> through DP-3 to date, flow of the deeper aquifer is towards the southwest. Based on the <br /> data plotted, it appears that the source(s) of nitrates in the deep aquifer is located off <br /> site in the area of the Dodge and Eason wells. <br /> • <br /> 117226.E02/ST012R0696 Page 25 of 43 September 14, 2012 <br /> Copyright 2012 Kleinfelder <br />