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Mr. Sandi De Jong <br /> October 10,2006 <br /> Page 4 <br /> Table 3. <br /> Current Meter Flow with Calculated Increased Usage for New Facility <br /> Previous Flow per Day Additional Flow Prediction for New Facility Final Predicted Flow <br /> 200.92 d <br /> / 133.95 gpd 133.95 x 50% ' = gP <br /> Proposed Small Cheese 71.23 gpd <br /> Making Facility (Flow prediction based on replica facility flow meter 71.23 gpd <br /> (3 year maximum use) calculation,"Oakdale Cheese") <br /> Total Flow - 272.15 gpd <br /> 4.0 SOURCES AND IMPACT OF NITRATE TO GROUND WATER <br /> 4.1 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 is discussed in Section 3.4 was found to be moderate. The septic use is <br /> still found to be moderate. <br /> 4.2 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 rainfall 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 and average rainfall data was obtained from the California <br /> Irrigation Management Information System (CIMIS). The data from January 1988 to December <br /> 2004 was used for the calculation. <br /> Based 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 /> ,"4.3 Current On-Site Sources of Nitrate <br /> Current on-site sources of nitrate include the septic system for the coffee drive-thru. <br />