36 C.F.R. § 219.12
(a) Plan monitoring program.
(4) Subject to the requirements of paragraph (a)(5) of this section, the responsible official has the discretion to set the scope and scale of the plan monitoring program, after considering:
(5) Each plan monitoring program must contain one or more monitoring questions and associated indicators addressing each of the following:
(b) Broader-scale monitoring strategies.
(c) Timing and process for developing the plan monitoring program and broader-scale strategies.
(3) To the extent practicable, appropriate, and relevant to the monitoring questions in the plan monitoring program, plan monitoring programs and broader-scale strategies must be designed to take into account:
(d) Biennial evaluation of the monitoring information.
(1) The responsible official shall conduct a biennial evaluation of new information gathered through the plan monitoring program and relevant information from the broader-scale strategy, and shall issue a written report of the evaluation and make it available to the public.