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5 BAS4S OF PLANNING <br /> <br />Under the new federal regulations 40 CFR, Part 503, max/mum concentrations, cumulative <br />pollutant loading rates, average pollutant limits or "clean biosolids; and armual pollutant <br />loadflng rates have been established for nine heavy metals. Table 5.1.4-2 shows the <br />acceptable levels for land application. These rates are rrsed to determine site life, which is <br />the number of years that biosolids with a uniform metal content could be applied to a <br />specific site. However, MWMC has adopted a policy that pollutant concentratiorts in <br />biosoLids be half of the federally required standards. <br /> <br />TABLE 5.1.4-2 <br />New Federal Regulations (40 CFR, Part 503) for Heavy Metalsa <br />MWMC Facility Plan, Eugene-Springfield <br /> <br /> Average <br /> Maximum Cumulative Average Concentration <br /> Concentration Loading Concentration Loading Rate <br /> Parameter (mc/kg) (kg/ha) (mc/kg) (kg/h~yr) <br /> <br />Arsenic 75 41 41 2.0 <br />Cadmium 85 39 39 1.9 <br />Copper 4,300 1,500 1,500 75 <br />Lead 840 300 300 15 <br />Mercury 57 17 t7 0.85 <br />Molybdenum 75 18 0.90 <br />Nickel 420 420 420 21 <br />Selenium 100 100 100 5.0 <br />Zinc 7,500 2,800 2,800 140 <br />a From 40 CFR, Part 503 (December 1992). <br /> <br />Site Identification and Approval <br />Prior to approving any potentially sensitive application site (with respect to residential <br />housing, runoff potential, or groundwater threat), DEQ may require an opportunity for <br />public comment and public hearing. A statement of land use compat/bflity from the <br />responsible planrfing jurisdiction should accompany requests for approval of biosolids land <br />application sites. New sites or expansion of existing sites must be proposed to DEQ prior to <br />use. Newly approved sites become part of the biosolids management plan. <br /> <br />Site criteria for land-applying biosolids include physical geographical features (geological <br />formation, flood plain proximity, and groundwater and surface water proximity, <br />topography, and soils), and method of application. DEQ's specific criteria are outlined in <br />Table 5.1.4-3. <br /> <br />Special Management Considerations <br />Land receiving bulk Class B biosolids for agricultural use requires special management <br />considerations. These relate to access to the site, types of crops grown, plant nutrient ra~es, <br /> <br />MWMC_50_REVS_VKS.DOC 5-15 <br /> <br /> <br />