1. a) Chemically treat a hazardous waste that is substantially different from waste previously treated in that impoundment; or
2. b) Chemically treat hazardous waste with a substantially different process than and previously used in that impoundment.

3. c) Required Actions

   1. 1) The owner or operator must conduct waste analyses and trial treatment tests (e.g., bench scale or pilot plant scale tests); or

   2. 2) The owner or operator must obtain written, documented information on similar treatment of similar waste under similar operating conditions, to show that this treatment will comply with Section 725.117(b).

      BOARD NOTE: As required by Section 725.113, the waste analyses plan must include analyses needed to comply with Sections 725.329 and 725.330. As required by Section 725.173, 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.

In addition to the waste analyses required by Section 725.113, whenever a surface impoundment is to be used for either of the purposes in subsections (a) and (b), the owner or operator must, before treating the different waste or using the different process, perform either of the required actions listed in subsection (c):

(Source: Amended at 42 Ill. Reg. 23725, effective November 19, 2018)