(1) For purposes of this subchapter, the department adopts and incorporates by reference:
- (a) Department Circular DEQ-7, "Montana Numeric Water Quality Standards" (June 2019 edition);
- (b) Montana Risk-Based Corrective Action Guidance for Petroleum Releases (RBCA) (February 2024);
- (c) U.S. Environmental Protection Agency, Regional Screening Level (RSL) Tables (November 2023); and
- (d) Reportable Quantities for Hazardous Substances under section 102(a) of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) published at 40 CFR Part 302 (2023).
- (2) All references in this subchapter to the documents incorporated by reference in this rule are to the edition specified in this rule.
- (3) Copies of the documents incorporated by reference in this rule may be obtained from the Department of Environmental Quality, P.O. Box 200901, Helena, MT 59620-0901.
Authorizing statute(s): 75-11-319, 75-11-505, MCA
Implementing statute(s): 75-11-309, 75-11-505, MCA
History: NEW, 2004 MAR p. 1391, Eff. 6/18/04; AMD, 2005 MAR p. 87, Eff. 1/14/05; AMD, 2006 MAR p. 528, Eff. 2/24/06; AMD, 2007 MAR p. 2124, Eff. 12/21/07; AMD, 2008 MAR p. 946, Eff. 5/9/08; AMD, 2010 MAR p. 1502, Eff. 6/25/10; AMD, 2010 MAR p. 1796, Eff. 8/13/10; AMD, 2012 MAR p. 2060, Eff. 10/12/12; AMD, 2017 MAR p. 186, Eff. 2/4/17; AMD, 2017 MAR p. 602, Eff. 5/13/17; AMD, 2019 MAR p. 174, Eff. 2/9/19; AMD, 2019 MAR p. 826, Eff. 6/22/19; AMD, 2024 MAR p. 1062, Eff. 5/11/24.