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5 B/~)S OF PLANNING <br /> <br />Nutrient Loading <br />Biosolids application to agricultural land should not exceed the annual nitrogen loading <br />required for maximum crop yield and is, therefore, managed according to its fertilizer value. <br />Biosolids may be applied to approved sites above agronorrdc rates on a one-time basis or <br />less than once per year as long as rtmoff, nuisance conditions, or groundwater <br />contamination do not occur. Nitrogen accumulation from higher than agronomic rates and <br />annual nitrogen use w/Il determine the acceptable loading rate and frequency. <br /> <br />Site Life <br />Site life is important in planning because sites generally have a t/mAted application life based <br />on the chemistry of the soil and the metals loading from the biosolids. Site life is calculated <br />by dividing lifetime biosolids loading limits based on the most limiting constituent by the <br />annual application rate. <br /> <br />Seasonal Constraints <br />In western Oregon, where soil damage may occur from applicatSon equipment traffic in the <br />wet season, biosolids application should be restricted to the dry season. The main <br />consideration in land-applying on sloping ground is avoiding surface runoff and soft <br />erosion. <br /> <br />Grazing Restrictions <br />Grazing animals should not be allowed on pasture or forage nor should Livestock feed be <br />harvested for 30 days after application of bulk Class B biosolids or domestic septage. <br /> <br />The current biosolids management practices are discussed in section 6.5 in Chapter 6.0. <br /> <br />5.1.5 Reuse Effluent Quality <br />An alternative to direct river discharge of treated effluent during dry weather is to apply <br />treated effluent to meet irrigation demands at agricultural lands, golf courses, and parks. <br />Effluent can also be reused as reclaimed water for specific nonagricultural industrial trses, <br />such as cooling water. The standards for effluent reuse in Oregon are established by the <br />DEQ through OAR Chapter 340 Division 55 (340-55). <br /> <br />Treatment and Monitoring Requirements for Effluent Reuse <br />Through OAR 340-55, DEQ has established treatment and monitoring requirements for <br />potential agricultural and nonagricultural uses of the treated effluent. DEQ has classified <br />reclaimed water into four categories and assigned a minimum degree of treatment required: <br /> <br /> Level I: Less than biological treatment or biological treatment without disinfection <br /> Level II: Biological treatment plus disinfection <br /> <br />- Level III: Biological treatment plus disinfection (stricter coliform 1Lrrdt) <br /> <br /> Level IV: Biological treatment, darification, coag~ation, and filtration treatment plus <br /> disinfection <br /> <br />Limits for total coliform (organisms/100 mL) and turbidity [nephelometric turbidity units <br />(NTUs) have been established for the four categories. These standards serve as a general <br />gu/deline for defining the anticipated water quality required for the various uses. In <br /> <br />M~C_5.0_REVs_VKS.DOC 5-17 <br /> <br /> <br />