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L <br /> LApril 9, 2007 <br /> NOA Project Number: E07045A <br /> L ✓ 2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential ground water contamination is included in Section 4.2 of <br /> the SSS. <br /> ✓2.3 Current and Future On-Site Ground Water Uses <br /> L Ground water is currently used for the existing structures on the subject property. Ground water will <br /> L also be used in the proposed development of the winery. <br /> ✓ 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> L3.1 Current Off-Site Sources of Nitrate <br /> LWe recognize that septic systems, agriculture, and dairies in the area may be the most significant <br /> sources of nitrate. Septic tank use in the vicinity is discussed in Section 3.4 of the SSS. <br /> LThe onsite water well was tested for nitrate and DBCP. The results of this analysis are forthcoming. <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 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 /> Lconsider runoff. See Plate 9 for the data and calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> LInformation System (CIMIS). Stockton is located within evapotranspiration zone number 12. The <br /> average rain fall for the Stockton 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 1948 through 2004. <br /> L Based on this method, the average deep percolation of rain for the Acampo area is estimated to be <br /> L 5.76 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche and <br /> Finnernore, 1992). <br /> L <br /> L <br /> L 3 <br /> '-04L <br />