25 CFR § 169.205 - What is the approval process for an amendment of a right-of-way?
(a) When we receive an amendment for our approval, we will notify the grantee of the date we receive it. We have 30 days from receipt of the executed amendment, proof of required consents, and required documentation (including but not limited to a corrected legal description, if any, and NEPA compliance) to approve or disapprove the amendment. Our determination whether to approve the amendment will be in writing and will state the basis for our approval or disapproval.
(b) If we need additional time to review, our letter informing the parties that we need additional time for review must identify our initial concerns and invite the parties to respond within 15 days of the date of the letter. We have 30 days from sending the letter informing the parties that we need additional time to approve or disapprove the amendment.