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percolation of the effluent and provide greater nitrate reduction than is indicated by this <br /> calculation. The requirement by San Joaquin County Environmental Health Department <br /> that the calculation use rainfall and evapotranspiration data to determine ground-water <br /> recharge is particularly conservative, as it does not include consideration of recharge <br /> from irrigation water or surface water sources. <br /> Because of the result of the nitrate loading calculation, nitrate mitigation measures may <br /> be required by the San Joaquin County Environmental Health Department. A modified <br /> or engineered septic system may be required for the second home. <br /> LOGE 1911 Page 12 <br />