What is the listing approach used in the dyes and pigments final rule?
EPA has used a mass loading-based approach to list wastes from the production of dyes and/or pigments. Under this approach, these wastes are hazardous if they contain any of the constituents of concern at annual mass loading levels that meet or exceed the regulatory levels. All wastes that contain constituents of concern up to the regulatory levels would be considered nonhazardous.
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