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22 April 2009 <br /> AGE-NC-09-1683 <br /> Pagel` 13 of 19 <br /> 8,3. CURRENT AND FUTURE USE OF GROUND WATER AT THE SITE <br /> The existing water supply well appears to conform to DWR and SJCEHD standard and will supply <br /> the domestic uses at the property. <br /> 9.0 IMPACT OF NITRATE TO GROUND WATER <br /> Due to the proposed commercial use of the property and the potential for nitrate leaching into the <br /> ground water from the existing septic system, a nitrate loading analysis for the future use has been <br /> required by the SJCEHD. <br /> 9.1, CURRENT OFF-SITE SOURCES OF NITRATE <br /> Septic systems and agriculture are sources of nitrates in the area of the site. Surrounding residences <br /> appear to be over '/4-mile from the site. <br /> 9.2. IMPACT OF RAINFALL CONTRIBUTION TO NITRATE LOAD <br /> Ther ainfall of the area has been estimated for the nitrate loading analysis. Deep percolation is <br /> estimated by calculating the average monthly rainfall and evapotranspiration of the site area. If <br /> average monthly rainfall exceeds average monthly potential for evapotranspiration{ETJ there is a <br /> potential for deep percolation without consideration for runoff.Average potential ET.was estimated <br /> from-data obtained from the California Irrigation Management Information System(CIMIS)Lodi <br /> West;,Station 4166.The monthly rainfall averages were obtained from the Western Regional Climate <br /> Center and calculated based on data collected between 1893 and 2007,the yearly rain fall average <br /> for tl pe Lodi area was calculated as 17.28 inches. ET,,and rainfall data are provided in Appendix G. <br /> Advanced GeoEnvironmental,Inc. <br />