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Waste Characterization and Classification Flashcards

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Read the first 7 Waste Characterization and Classification flashcards as text

  1. Which of the following best describes the 'mixture rule' under RCRA?

    Answer: A mixture of a listed hazardous waste with any solid waste is itself listed hazardous

    The Mixture Rule (40 CFR 261.3(a)(2)(iv)) states that mixing any amount of a listed hazardous waste with solid waste results in the entire mixture being classified as listed hazardous.

  2. What is the significance of a waste's 'hazardous constituent' concentration compared to its 'hazardous characteristic' threshold?

    Answer: Characteristic thresholds trigger RCRA jurisdiction; constituent concentrations inform LDR treatment standards

    Exceeding characteristic thresholds (e.g., TCLP limits) makes a waste hazardous under RCRA, while constituent concentrations in Appendix VIII are used to set LDR treatment standards for land disposal.

  3. Which waste classification applies to batteries, pesticides, mercury-containing equipment, and certain lamps under a streamlined RCRA management framework?

    Answer: Universal wastes (40 CFR Part 273)

    The Universal Waste Rule (40 CFR Part 273) establishes reduced management standards for widely generated hazardous wastes including batteries, pesticides, mercury lamps, and mercury-containing equipment.

  4. When characterizing an unknown waste, what is the recommended first step before conducting chemical analysis?

    Answer: Review process knowledge and existing records to identify potential constituents

    Process knowledge review—examining material safety data sheets, production records, and chemical inventories—is the first and most cost-effective step in unknown waste characterization.

  5. What distinguishes 'speculative accumulation' of recyclable materials from legitimate recycling under RCRA?

    Answer: Materials are accumulated without a reasonable expectation of timely recycling

    Speculative accumulation (40 CFR 261.1(c)(8)) occurs when recyclable materials are accumulated without a reasonable likelihood of recycling within one year, triggering RCRA waste management requirements.

  6. A waste exhibits a TCLP lead concentration of 6.0 mg/L. The regulatory threshold for lead is 5.0 mg/L. How should this waste be classified?

    Answer: Hazardous waste with code D008 (toxicity characteristic for lead)

    A TCLP lead result exceeding the 5.0 mg/L regulatory level (40 CFR 261.24) classifies the waste as D008, a toxicity characteristic hazardous waste for lead.

  7. Which federal law governs the cleanup of abandoned hazardous waste sites and uses waste characterization data to prioritize remediation?

    Answer: Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)

    CERCLA (Superfund) authorizes EPA to investigate and clean up abandoned hazardous waste sites, relying on waste characterization data to assess risk and prioritize remedial actions via the Hazard Ranking System.