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% ..r <br /> January 14,2003 <br /> Job Number:LG02-460 <br /> Page 9 <br /> sands and some muck soils are the only soils where ammonium leaching may be significant. <br /> One way to minimize N leaching and denitrification is to minimize the time the N is in the soil <br /> before plant uptake. This cuts down on the time when conditions are favorable for losses.t0 <br /> Proper management of agricultural property significantly reduces the potential nitrate impact to <br /> ground water. <br /> According to Phillip Martin, recommendations for the application of fertilizer and irrigation for <br /> crops grown on the property are provided by Phillip Domena of Simplot. Since the fertilizer <br /> application for crops are made by an agricultural consultant, we will assume that nitrogen losses <br /> to ground water are minimized to the best extent possible using current agricultural practices. <br /> Any leaching of nitrogen to ground water will not be considered in the nitrate loading balance. <br /> 6.3 Nitrate Loading Analysis <br /> The nitrate loading analysis was performed for two (2) different scenarios; a 10 acre parcel with a <br /> residence and SDU and a 43.3 acre parcel with a residence and SDU. The nitrate loading <br /> analysis has indicated that using the stated assumptions, the Nc value for the 10 acre parcel may <br /> reach a concentration of 10-mg/L-N. The water quality goal of no greater than10 mg/L(Nc) is <br /> recommended for the percolating effluent on each parcel. The use of a 2-bedroom second <br /> dwelling unit in addition to a 3 bedroom residence on the 10 acre Parcel 1 may cause a build up <br /> of nitrates in the ground water up to 10 mg/L-N. The concentration of 10 mg/L-N in drinking <br /> 6. water is the maximum contaminate level for nitrate. The Nc concentration for the 43.3 acre <br /> designated remainder parcel is below 10 mg/L-N. The calculations are presented on Plates 5 and <br /> 6 in the appendix. A summary of the nitrate loading analysis is presented next. <br /> L <br /> 6. <br /> Vitosh,M.L.,J.W.Johnson and D.B.Mengel,July 1995.Tri-state Fertilizer Recommendations for <br /> Com,Soybeans,Wheat and Alfalfa,Extension Bulletin E-2567. <br /> OEQ <br />