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I <br /> r I <br /> December 23, 2005 <br /> NOA Project Number: E05174A <br /> the SSS. Chicken manure and composting processes are discussed further in this report. <br /> �2.3 Current and Future On-Site Ground Water Uses <br /> Three active water wells and one idle water well exists on the property. The idle well has sat for <br /> years unused. The three productions wells are "tied together" into one system and supply all the <br /> residences and the facility. Use of the wells is planned to continue. <br /> 1 'I <br /> r 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> /3.1 Current Off-Site Sources of Nitrate <br /> We recognize that septic systems, agriculture, dairies, and bird manure may be the most significant <br /> sources of nitrate in the area. Septic tank use in the vicinity is discussed in Section 3.4 of the SSS. <br /> -' <br /> �,X3.2 Contribution of Rainfall <br /> rAn 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 the Lodi area of California. An estimate of potential deep percolation of <br /> rain determines whether the average monthly precipitation exceeds average monthly potential <br /> -' evapotranspiration. If so, then the difference is potential deep percolation. This method does not <br /> consider runoff. See Plate 9 for the data and calculation. <br /> FAverage potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Stockton is located within evapotranspiration zone number 12. The <br /> average rain fall for the Lodi area was obtained from the Western Regional Climate Center <br /> (www.wrcc.dri.edu), and was found to be 17.57 inches per year for the years)948 through 2004. <br /> Based on this method,the average deep percolation of rain for the Lodi area is estimated to be 5.76 <br /> inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche and <br /> Finnemore, 1992). <br /> r I <br /> F <br /> f <br /> �l <br /> 3 <br />