43 C.F.R. § 46.320 – Adopting environmental assessments prepared by another agency, entity, or person.

(a) A Responsible Official may adopt an environmental assessment prepared by another agency, entity, or person, including an applicant, if the Responsible Official:
1. (1) Independently reviews the environmental assessment; and
2. (2) Finds that the environmental assessment complies with this subpart and relevant provisions of the CEQ Regulations and with other program requirements.
(b) When appropriate, the Responsible Official may augment the environmental assessment to be consistent with the bureau's proposed action.
(c) In adopting or augmenting the environmental assessment, the Responsible Official will cite the original environmental assessment.
(d) The Responsible Official must ensure that its bureau's public involvement requirements have been met before it adopts another agency's environmental assessment.