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June 27, 2005 <br /> NOA Project Number: E05087A <br /> �j 3.2 Potential Ground.Water Contamination Issues <br /> JA discussion of issues related to potential groundwater contamination is 'included in Section 4.2 of <br /> the SSS. <br /> Fj3.3 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 is <br /> currently used for agricultural purposes. The existing well is going to be kept and a new well will be <br /> installed on the property for the new development -. <br /> F1 <br /> .4.0 SOURCES AND IMPACT OF.,NITRATE TO GROUND WATER <br /> 4.1 Current Off-Site Sources of Nitrate <br /> Septic systems, agriculture, and dairies in the area may be the most significant sources of nitrate. <br /> Septic tank use in the vicinity is discussed in Section 3.4 was found to be fairly high please see that - <br /> section for more details. The ground water sample, discussed in Sections 4.3 through 4.6 of the SSS, <br /> was found to have-a nitrate concentration of 7.46 mg/L-NC),. <br /> 4.2 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 Lodi, California.The estimate first determines whether the average monthly <br /> F1precipitation exceeds average monthly potential evapotranspiration. If so, then the difference is <br /> potential'deep percolation. This method does not consider runoff. See Plate 9 for the data and <br /> calculation. <br /> Average precipitation was obtained from the Western Regional Climate Center. The data for the <br /> Lodi Station (#045032) is available from July 1948 to September 2004. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS) Zone 12. <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 /> F . Finnemore, 1992). <br /> F1 <br /> 3 - <br />