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Discussion of Nitrate Loading Results <br /> Total Nitrate Impact <br /> Based on the method and assumptions described, the result of the nitrate loading <br /> estimate indicates that the proposed development on the Site has the potential to cause <br /> a buildup of nitrates in the aquifer above 10 mg/L-N. <br /> There are two mitigating factors that should be considered, however, when evaluating <br /> whether or not this Site is likely to impact ground water with nitrate: <br /> • The Hantzsche and Finnemore equation is a conservative method for <br /> determining potential impacts, and actual nitrate loading experienced on the Site <br /> over time may be less than predicted. The requirement by San Joaquin County <br /> Environmental Health Department that the calculation use rainfall and <br /> evapotranspiration data to determine ground-water recharge is particularly <br /> conservative, as it does not include consideration of recharge from irrigation <br /> water or surface water sources. <br /> • Based on the San Joaquin County Environmental Health Department's map of <br /> Nitrate — Land Use Data, discussed above, it does not appear that nitrate <br /> contamination is a problem in the vicinity of the Site. Even if the search area is <br /> extended to a two-mile radius of the Site, no wells within that area have exhibited <br /> nitrate levels above 10 mg/L-N, and all but one fall below 5.0 mg/L-N. <br /> Based on the conservative nature of the calculation and low existing nitrate levels in <br /> ground water, it is the professional opinion of Live Oak that effluent from a shallow <br /> septic system on the subject Site is unlikely to contribute significantly to a build-up of <br /> nitrate in the ground water. <br /> LOGE 1936 Page 11 <br />