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August 8, 2006 <br /> NOA Project Number: E06087A <br /> the SSS. <br /> 2.3 Current and Future On-Site Ground Water Uses <br /> The use of ground water for drinking water is planned for the proposed development. There is <br /> currently one well on the Site. According to the John DellaMonica of DellaMonica& Snyder <br /> Architects, another well will be developed on site, along with the development of a fire suppression <br /> I well. <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 <br /> J the county. Septic tank use in the vicinity discussed in Section 3.4 was found to be dense. The .]� <br /> onsite water well was tested for nitrate and DBCP. The results of these tests are forthcoming. Obi <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 />+ Fi 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 /> precipitation exceeds average monthly potential evapotranspiration. If so, then the difference is <br /> Fpotential deep percolation. This method does not consider runoff. See Plate 9 for the data and <br /> calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Lodi 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 /> t J (www.wrcc.dri.edu),and was found to be 15.98 inches per month for the years 1965 through 1977. <br /> r Based on this method, the average deep percolation of rain for the:Lindh is estimated to b 5.76 <br /> inches. The nitrate concentration of rain fall was estimated t e 1 mg/L- (Hantzsche and <br /> Finnemore, 1992). <br /> 1 3.3 Current On-Site Sources of Nitrate <br /> f <br /> Current on-site sources of nitrate include the two current septic systems on the property. No <br /> additional sources of nitrates besides septic effluent,groundwater and rainfall are recognized. <br /> Fi <br /> �^ 4 <br />