40 CFR § 265.225 - Waste analysis and trial tests.
(1) Chemically treat a hazardous waste which is substantially different from waste previously treated in that impoundment; or
(2) Chemically treat hazardous waste with a substantially different process than any previously used in that impoundment; the owner or operator must, before treating the different waste or using the different process:
(i) Conduct waste analyses and trial treatment tests (e.g., bench scale or pilot plant scale tests); or
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