1. a) Injection into a Class IV injection well, as defined in Section 704.106(d)(1), is not authorized. The owner or operator of any such well must comply with Sections 704.124 and 704.203.

2. b) Closure.

   1. 1) Prior to abandoning any Class IV injection well, the owner or operator must plug or otherwise close the well in a manner acceptable to the Agency.
   2. 2) The owner and operator of any Class IV injection well must submit to the Agency a plan for plugging or otherwise closing and abandoning the well.
   3. 3) The owner or operator of a Class IV injection well must notify the Agency of intent to abandon the well at least 30 days prior to abandonment.

3. c) Notwithstanding subsections (a) and (b), an injection well that is used to inject contaminated groundwater that has been treated and which is being injected into the same formation from which it was drawn is authorized by rule for the life of the well if such subsurface emplacement of fluids is approved by USEPA pursuant to provisions for cleanup of releases under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) (42 USC 9601 et seq.), by USEPA pursuant to requirements and provisions under the Resource Conservation and Recovery Act (RCRA) (42 USC 6901 et seq.), or by the Agency pursuant to Section 39 of the Act.

   BOARD NOTE: Derived from 40 CFR 144.23 (2017).

(Source: Amended at 42 Ill. Reg. 21095, effective November 19, 2018)