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law <br /> V December 14,2005 <br /> NOA Project Number: E05116B <br /> Lz f/2.3 Current and Future On-Site Ground Water Uses <br /> L 3 One domestic water well exists in the northeast cornet of the property on proposed Parcel 1. Each <br /> new parcel will utilize a water well to supply domestic water to each residence. <br /> 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> j CJS 3.1 Current Off-Site Sources of Nitrate <br /> L3'a We recognize that septic systems,agriculture, and dairies in the area may be the most significant <br /> sources of nitrate in ground water. Septic tank use in the vicinity is discussed in Section 3.4 of the <br /> L SSS. <br /> The water sample was analyzed for nitrate and DBCP. Nitrate was found at 21.7 mg/L-NO3,which <br /> ✓ is well below the maximum contaminant level (MCL) set by the US EPA of 45 mg/L-NO3' DBCP <br /> was not detected in the water sample. !✓ <br /> / 3.2 Contribution of Rainfall <br /> L ✓ 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 /> consider runoff. See Plate 9 for the 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. 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 1948 through 2004. <br /> LBased 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 /> hm <br /> L <br /> L <br /> LL <br /> 3 '04 <br /> r <br />