25 C.F.R. § 1000.1405

If a Tribe/Consortium adopts the environmental review procedures of a Federal agency, is the Tribe/Consortium responsible for ensuring the agency's policies and procedures meet the requirements of NEPA, NHPA, and related environmental laws?

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No, the Federal agency is responsible for ensuring its own policies and procedures meet the requirements of NEPA, NHPA, and related environmental laws, not the Tribe/Consortium.