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October 11, 2005 <br /> NOA Project Number: E05111B <br /> the SSS. <br /> 2.3 Current and Future On-Site Ground Water Uses <br /> A description of the existing wells on the Site is included in Section 4.3 of the SSS. Ground water <br /> will be developed and used on the each parcel in the future. <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 in the area may be the most significant sources of nitrate in (7,� <br /> 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 fall and <br /> evapotranspiration for north Stockton, California. The estimate first determines whether the <br /> average monthly precipitation exceeds average monthly potential evapotranspiration. If so, then the <br /> difference is potential deep percolation. This method does not consider runoff. See Plate 9 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 /> Based on this method, the average deep percolation of rain for the north Stockton area is estimated <br /> to be 4.68 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche <br /> and Finnemore, 1992). <br /> 3.3 Current On-Site Sources of Nitrate <br /> There are no current on-site sources of nitrate except for natural processes. Row crops and <br /> vineyards have existed on the property before 2000. There may have been nitrogen fertilizers (3•� <br /> applied to these crops in the past. <br /> 3.4 Future On-Site Sources of Nitrate <br /> 3.4.1 Quantity and Quality of Domestic Wastewater From Proposed Project <br /> The following discussion is for determining the long-term waste water flow generated from the <br /> 4 <br />