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Extra resources for Risk-Based Classification of Radioactive and Hazardous Chemical Wastes (Ncrp Report, No. 139)

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The use of a negligible risk or dose to determine exempt waste is based on an assumption that a disposal facility for nonhazardous waste could be released for unrestricted use by the public soon after the facility is closed. 3. 3. For radionuclides, NCRP has recommended that an annual effective Any nonexempt waste that is generally acceptable for disposal in dedicated nearsurface facility for hazardous wastes d Any nonexempt waste that generally requires disposal system more isolating than dedicated near-surface facility for hazardous wastes f Low-hazard waste High-hazard waste Concentrations of any hazardous substances that exceed limits for low-hazard waste Based on a risk index less than unity for all hazardous substances and assumption that risk or dose to hypothetical inadvertent intruder at disposal site should not exceed acceptable (barely tolerable) levels e Based on a risk index less than unity for all hazardous substances and assumption that risk or dose to hypothetical inadvertent intruder at disposal site should not exceed negligible levels Determination of Boundary of Waste Class b a Classification system applies to any waste that contains radionuclides or hazardous chemicals.

NCRP recommends that generic scenarios for exposure of hypothetical inadvertent intruders at disposal sites should be used in classifying waste. This recommendation is based on two considerations. First, scenarios for inadvertent intrusion can be applied to an assumed type of disposal system at any site, whereas scenarios for exposure of members of the public due to release and transport of hazardous substances to locations beyond the boundary of a disposal facility are highly site-specific and, thus, are not appropriate for use in generally classifying waste.

Properly treated ignitable, corrosive, and reactive wastes, if they are not otherwise hazardous, are no longer considered hazardous. The toxicity characteristic is defined in terms of the leachability of specified organic compounds and heavy metals. , cement). , if it contains heavy metals that are immobilized but not destroyed by treatment). ● Waste is classified as hazardous by listing if it contains any amount of specified materials from nonspecific sources (the socalled ‘‘F’’ list), specified materials from specific sources (the ‘‘K’’ list), or specified chemicals from any source (the ‘‘P’’ and ‘‘U’’ lists).

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