8.2.314 SUPPLEMENTS TO ENVIRONMENTAL IMPACT STATEMENTS
(1) The agency shall prepare supplements to either draft or final
environmental impact statements whenever:
(a) the agency or the applicant makes a substantial change in a proposed
(b) there are significant new circumstances, discovered prior to final
agency decision, including information bearing on the proposed action or its
impacts that change the basis for the decision; or
(c) following preparation of a draft EIS and prior to completion of a final
EIS, the agency determines that there is a need for substantial, additional
information to evaluate the impacts of a proposed action or reasonable
(2) A supplement must include, but is not limited to, a description of the
(a) an explanation of the need for the supplement;
(b) the proposed action; and
(c) any impacts, alternatives or other items required by ARM 8.2.310 for a
draft EIS or ARM 8.2.312 for a final EIS that were either not covered in the
original statement or that must be revised based on new information or
circumstances concerning the proposed action.
(3) The same time periods applicable to draft and final EISs apply to the
circulation and review of supplements.
History: Sec. 2-3-103, 2-4-201, MCA; IMP, Sec. 2-3-104, 75-1-201, MCA; NEW, 1988 MAR p. 2692, Eff. 12/23/88.