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E6] CONCLUSIONS <br /> Since the present water table level is relatively shallow and has <br /> been at higher elevations, maximum protection measures to the <br /> y underlying groundwater should be engineered. These protection <br /> practices would include (1) placement of the leach lines at a <br /> shallow depth (6 inch minimum) to promote evaporation of effluent, <br /> (2) designing the greatest amount of leach field area, and (3) <br /> �.• direct observation by the Engineer of Record of the proposed <br /> subsurface leach field soil prior to leach line emplacement. <br /> Due to the agricultural nature of the subject property soils, most <br /> soil nitrogen can be found in the soil organic matter. This is <br /> particularly important since sugar beets were the last crop to be <br /> grown on the subject property. <br /> The nitrogen cycle in soils is highly complex. The subject <br /> �.• property soils are somewhat conducive to two beneficial nitrogen <br /> cycle processes, namely denitrification and fixation of ammonium. <br /> Denitrification occurs under reduced oxygen supply, e.g. when water <br /> fills the soil voids and pores. Due to the amount of flood <br /> irrigation in the area, saturated conditions are possible. Under <br /> these anaerobic conditions, nitrate nitrogen serves as an electron <br /> acceptor and is reduced to gaseous nitrogen forms. <br /> Fixation of ammonium occurs when the adsorption of ammonium <br /> molecules takes place between expanding clay particles. Ammonium <br /> is therefore unavailable for transformation to nitrate. <br /> 16. <br /> V <br /> V <br /> r <br /> 4 <br /> � ��_t �ality �ontm� �nSpOCtion <br />