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(a) In addition to the waste analyses required by §265.13 , whenever a surface impoundment is to be used to:
(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
(ii) Obtain written, documented information on similar treatment of similar waste under similar operating conditions; to show that this treatment will comply with §265.17(b) .
[Comment: As required by §265.13 , the waste analysis plan must include analyses needed to comply with §§265.229 and 265.230 . As required by §265.73 , the owner or operator must place the results from each waste analysis and trial test, or the documented information, in the operating record of the facility.]