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August 31, 2006 <br /> NOA Project Number: E06091A <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. <br /> 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> F13.1 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 discussed in Section 3.4 was found to be low. The onsite water well <br /> was tested for nitrate and DBCP. Nitrate was found at 161 mg/L-N0.,which is well above the' /3 J <br /> maximum contaminant level(MCL) set by the US EPA of 45 mg/L-NO3.+DBCP was not detected <br /> in the water sample. <br /> P3.2 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 /> precipitation 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 potential evapotranspiration was obtained from the California Irrigation Management 3. <br /> Information System (CIMIS). Lodi is located within evapotranspiration zone number 12. The <br /> F! 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 15.98 inches per month for the years 1965 through 1977. <br /> Based on this method, the average deep percolation of rain for the Lodi area is estimated to 1,0ep'576 <br /> inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche and <br /> Finnemore, 1992). <br /> ' <br /> 3.3 Current On-Site Sources of Nitrate <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. 3� <br /> ! ; <br /> A <br /> 4 <br /> J n <br /> f <br />