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L March 15,2007 <br /> NOA Project Number. E07031A <br /> 23 Current and Future On-Site Ground Water Uses <br /> r, One domestic water well exists on the property and is associated with the 8,000 square foot building <br /> on site. Use of the well will continue for the proposed kennel. <br /> r <br /> 3.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> 3.1 Current Off-Site Sources of Nitrate <br /> We recognize that septic systems, agriculture, and dairies in the area may be the most significant j <br /> r, sources of nitrate. Septic tank use in the vicinity is discussed in Seco 3.4 of the SSS. <br /> The water sample was analyzed for nitrate. Nitrate was foun which is below the <br /> maximum contaminant level (MCL) set by the US EPA of 4 <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 Manteca area of California.An estimate of potential deep percolation of <br /> rain water recharge into the ground is required for the nitrate loading calculation. Since the site is <br /> fairly sandy and a moderate to rapid percolation rate was measured,we will make the assumption <br /> that nearly all the rainfall will infiltrate the ground fairly rapidly. Therefore,we estimate that roughly / <br /> 90 percent of the rain fall will enter the ground as recharge. The 10 percent reduction is to allow for <br /> some evaporation,transpiration of plants. Runoff is not expected. This method is not appropriate <br /> for sites which have slow infiltration rates. <br /> Based on this method,an estimate for the deep percolation of rain for the Site is 11.69 inches. The j <br /> ` deep percolation of rain is based on 90 percent of the long-term average total rain fall for the <br /> Manteca area (www.cimis.water.ca.gov): 12.96 inches x 0.9 = 11.69 inches. The nitrate <br /> concentration of rainfall was estimated to be 1 mg/L-N (Hantzsche and Finnemore, 1992). <br /> 3.3 Current On-Site Sources of Nitrate <br /> The site is vacant land besides the 8,000 square foot building. No sources of nitrates besides septic <br /> .. effluent and rainfall are recognized. <br /> 3.3.1 Eirisang Septic System <br /> One septic system exists on site which is associated with the subject property buildu*.-- <br /> 3 <br />