The Resource Conservation and Recovery Act (RCRA) establishes a comprehensive framework for managing hazardous waste from "cradle to grave," placing significant responsibilities on hazardous waste generators to ensure proper handling, storage, and disposal. These requirements are designed to protect human health and the environment by preventing releases of hazardous substances.
Waste Characterization:
The first and arguably most crucial step for a generator is to accurately characterize their waste. This involves determining whether a waste is hazardous according to RCRA regulations. The process includes both knowledge of the waste stream and potentially laboratory testing.
1. Determining if the Waste is a Solid Waste: RCRA defines "solid waste" broadly to include solids, liquids, and contained gases that are discarded by being abandoned, recycled, or inherently waste-like. If a material is not a solid waste under RCRA's definition, it is not subject to hazardous waste regulations. An example would be a byproduct that is used as a raw material in another manufacturing process without being discarded; it may not be considered a solid waste.
2. Determining if the Solid Waste is a Hazardous Waste: If a waste is determined to be a solid waste, the next step is to determine if it is a hazardous waste. This involves checking two main criteria:
Listed Waste: EPA maintains lists of specific wastes that are considered hazardous because they are known to be harmful. These lists are divided into four categories: F-list (wastes from non-specific sources, like solvents), K-list (wastes from specific industries, such as petroleum refining), P-list (acutely hazardous discarded commercial chemical products), and U-list (toxic discarded commercial chemical products). For example, spent trichloroethylene (TCE) solvent from a metal degreasing operation would be classified as an F-listed hazardous waste (F001). Discarded containers that held P-listed chemicals are also regulated as hazardous waste, even if empty.
Characteristic Waste: If a waste is not listed, it is still considered hazardous if it exhibits one or more of the following characteristics:
Ignitability: A waste is ignitable if it is a liquid with a flash point less than 60°C (140°F), is an oxidizer, or is capable of causing fire through friction, absorption of moisture, or spontaneous chemical changes. Examples include waste paints, solvents, and some compressed gases.
Corrosivity: A waste is corrosive if it is aqueous and has a pH less than or equal to 2 or greater than or equal to 12.5, or if it corrod....
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