Risk-Based Waste Classification in California (Compass by National Research Council, Division on Earth and Life

By National Research Council, Division on Earth and Life Studies, Commission on Life Sciences, Committee on Risk-Based Criteria for Non-RCRA Hazardous Waste

Addresses the regulatory requirement lower than part 57004 of the California future health and defense Code. Discusses the clinical foundation of the proposed waste category process, topic to exterior medical peer evaluate through the nationwide Academy of Sciences, and the collage of California. Softcover.

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Additional resources for Risk-Based Waste Classification in California (Compass Series)

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Air, surface water, and soil). For any particular chemical, the numeric value of the TTLC, expressed in milligrams per kilogram, is generally 100 times the numeric value of the STLC, expressed in milligrams per liter. TTLCs have been derived for 38 chemicals. If the concentration of any of these chemicals in a waste exceeds the TTLC for that chemical, the waste is considered to be hazardous and is subject to disposal in a class I landfill. The current system has only one set of toxicity thresholds for STLCs or TTLCs.

Under California's regulations, certain wastes not classified as hazardous under RCRA may be classified and managed as hazardous waste if DTSC determines that they might adversely affect human health or the environment when disposed of as unregulated wastes. Current Waste-Classification System Like the federal RCRA, the DTSC waste-classification system identifies wastes as hazardous on the basis of their ignitability, corrosivity, reactivity, or toxicity. California uses the federal RCRA criteria for ignitability and reactivity.

That assessment is performed using a two-step approach. The first step consists of a comparison of the human toxicity exit concentration designated in the proposed EPA Hazardous Waste Identification Rule (HWIR) (61 Fed. Register 18780, Apr. 29, 1996) with the ecological toxicity exit concentration in that same proposal. If, for a particular chemical, the human toxicity exit concentration was lower than the ecological toxicity exit concentration in the HWIR proposal, DTSC considered that the criterion derived in the lower TTLC exposure scenario, based on human toxicity, would also protect the environment.

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