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November 30,2007 <br /> NOA Project Number: E07192A <br /> 2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential ground water contamination is included in Secti n 4.2 f <br /> the SSS. <br /> 2.3 Current and Future On-Site Ground Water Uses <br /> There are currently no wells on the site, as noted ' (Section 4.3 f,he_ss round water will be ' <br /> used on the site in the future. ` I <br /> 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> 3.1 Current Off-Site Sources of Nitrate <br /> Septic systems, agriculture, and dairies located in the area may be the most significant sources of <br /> nitrate in ground water. Septic tank use in the vicinity is discussed in Section 3.4 of the SSS. <br /> 3.2 Contribution of Rainfall <br /> An estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. The <br /> estimate of deep percolation of rain is based on the average monthly precipitation of rain fill and <br /> evapotranspiration for South Stockton,California. The estimate first determines whether the <br /> average monthly precipitation exceeds average monthly potential evapotranspiratio f then the <br /> difference is potential deep percolation. This method_ does not consider runoff. S Plate for the <br /> data and calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Stockton is located within evapotranspiration zone number 12. <br /> Average rainfall was obtained from the Western Regional Climate Center (Station 048558). <br /> Base#"s metho , e average deep pe olation of rain for the Sou Stockton ea is estimated <br /> to b 3.3 ' hes. e nitrate concentration f rain fall was estimated t be 1 mg/L- (Hantzsche <br /> andFin pd <br /> more, 1 92 . <br /> 3.3 Current On-Site Sources of Nitrate <br /> There are no current on-site sources of nitrate except for natural processes/ <br /> 5 <br />