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It should be remembered, however, that the Hantzsche and Finnemore equation is a <br />conservative method for determining potential impacts, and actual nitrate loading <br />experienced on the Site over time may be less than predicted. The requirement by San <br />Joaquin County Environmental Health Department that the calculation use rainfall and <br />evapotranspiration data to determine ground -water recharge is particularly conservative, <br />as it does not include consideration of recharge from irrigation water or surface water <br />sources. Additionally, based on the water sample collected, current nitrate levels at the <br />Site are well below the MCL, despite existing residential development. <br />Although Live Oak cannot make engineering recommendations, we are aware that the <br />San Joaquin County Environmental Health Department often allows the use of standard <br />systems with oversized septic tanks in cases where a 30 percent reduction would bring <br />the nitrate loading under the MCL; the subject Site's nitrate loading result meets this <br />criterion. The use of a shallow septic leach field rather than deeper sumps is <br />anticipated to provide additional reduction in nitrate loading. <br />LOGE 2237 Page 13 <br />