Which statement best describes a derived rule in hazardous waste regulation?

Which statement best describes a derived rule in hazardous waste regulation?

• A. Ash created by burning a hazardous waste
• B. A non-toxic sludge generated from treatment of a listed waste
• C. Products derived from recycled hazardous wastes
• D. Residues from treatment operations

Answer: (B)

The idea being tested is that residues derived from treating a listed hazardous waste keep the hazardous-waste designation under the derived-from rule. This rule means that if you take a listed hazardous waste and process it, the material you end up with—its residues or by‑products—are regulated as hazardous waste because of their origin, even if they don’t seem hazardous themselves. A non-toxic sludge produced during treatment of a listed waste fits this rule perfectly: the sludge comes from processing a listed hazardous waste, so it inherits hazardous-waste status regardless of its current non-toxic appearance. The other scenarios are less direct illustrations of the rule: ash from burning could be a residue from treatment, but the statement doesn’t clearly tie it to the derivation from a listed waste; products derived from recycled hazardous wastes refer to outputs rather than residues from treatment of a listed waste; residues from treatment operations is too vague without specifying the waste being treated.

The idea being tested is that residues derived from treating a listed hazardous waste keep the hazardous-waste designation under the derived-from rule. This rule means that if you take a listed hazardous waste and process it, the material you end up with—its residues or by‑products—are regulated as hazardous waste because of their origin, even if they don’t seem hazardous themselves. A non-toxic sludge produced during treatment of a listed waste fits this rule perfectly: the sludge comes from processing a listed hazardous waste, so it inherits hazardous-waste status regardless of its current non-toxic appearance. The other scenarios are less direct illustrations of the rule: ash from burning could be a residue from treatment, but the statement doesn’t clearly tie it to the derivation from a listed waste; products derived from recycled hazardous wastes refer to outputs rather than residues from treatment of a listed waste; residues from treatment operations is too vague without specifying the waste being treated.