(1) Unless expressly provided otherwise, whenever there is a reference in this subchapter to a federal regulation, the reference is to the July 1, 2019, edition of the Code of Federal Regulations (CFR).

(2) Copies of the CFR are available from the Superintendent of Documents, Government Printing Office, Washington, D.C. 20402, (202) 512-1800. The CFR may also be accessed electronically at: https://www.gpo.gov. Materials adopted and incorporated by reference in this subchapter are also available for public inspection and copying at DEQ, 1520 East 6th Avenue, P.O. Box 200901, Helena, MT 59620-0901.