1. After August 28, 2012, the authority of the commission to promulgate rules under sections 260.350 to 260.391 and 260.393 to 260.433 is subject to the following:

(1) The commission shall not promulgate rules that are stricter than, apply prior to, or apply mandatory obligations outside of the requirements of Title 40, U.S. Code of Federal Regulations, Parts 260, 261, 262, 264, 265, 268, and 270, as promulgated pursuant to Subtitle C of the Resource Conservation and Recovery Act, as amended;

(2) The commission shall not implement requirements prior to the requirements of Title 40, U.S. Code of Federal Regulations, Parts 260, 261, 262, 264, 265, 268, and 270, as promulgated pursuant to Subtitle C of the Resource Conservation and Recovery Act, as amended;

(3) Notwithstanding the limitations of subdivisions (1) and (2) of this subsection, where state statutes expressly prescribe standards or requirements that are stricter than or implement requirements prior to any federal requirements, or where state statutes allow the establishment or collection of fees, costs, or taxes, the commission may promulgate rules as necessary to implement such statutes;

(4) Notwithstanding the limitations of subdivision (1) of this subsection, the commission may retain, modify, or repeal any current rules pertaining to the following:

(a) Descriptions of applicable registration requirements; and

(b) The reporting of hazardous waste activities to the department; provided, however, that the commission shall promulgate rules, effective beginning with the reporting period July 1, 2017 – June 30, 2018, that allow for the submittal of reporting data in any format on an annual basis by large quantity generators and treatment storage and disposal facilities.

2. Nothing in this section shall be construed to repeal any other provision of law, and the commission and the department shall continue to have the authority to implement and enforce other statutes, and the rules promulgated pursuant to their authority.

3. On December 31, 2017, any rule contained in Title 10, Missouri Code of State Regulations, Division 25, Chapters 3, 4, 5, 7, 9, and 11, that is inconsistent with the provisions of subsection 1 above shall be null and void to the extent that it is inconsistent, and the least stringent rule shall control. Any such rule that applies mandatory obligations outside of the requirements of Title 40, U.S. Code of Federal Regulations, Parts 260, 261, 262, 264, 265, 268, and 270, as promulgated pursuant to Subtitle C of the Resource Conservation and Recovery Act, as amended, shall be null and void. The department shall file with the Missouri secretary of state any amendments necessary to ensure that rules are not inconsistent with the provisions of subsection 1 of this section.

4. Nothing in this section shall be construed to effectuate a modification of any permit. Upon request, the department shall modify as appropriate any permit containing requirements no longer in effect due to this section.

5. The department is prohibited from selectively excluding any rule or portion of a rule promulgated by the commission from any authorization application package, or program revision, submitted to the U.S. Environmental Protection Agency under Title 40, U.S. Code of Federal Regulations, Sections 271.5 or 271.21.

6. Any rule or portion of a rule, as that term is defined in section 536.010, that is created under the authority delegated in this section shall become effective only if it complies with and is subject to all of the provisions of chapter 536 and, if applicable, section 536.028. This section and chapter 536 are nonseverable and if any of the powers vested with the general assembly under chapter 536 to review, to delay the effective date, or to disapprove and annul a rule are subsequently held unconstitutional, then the grant of rulemaking authority and any rule proposed or adopted after August 28, 2012, shall be invalid and void.