25 C.F.R. § 170.463
What if a design deficiency is identified?
If the Secretaries identify a design deficiency that may jeopardize public health and safety if the facility is completed, they must:
(a) Immediately notify the Tribe of the design deficiency and request that the Tribe promptly resolve the deficiency under the standards in § 170.454; and
(b) For a BIA-prepared PS&E package, promptly resolve the deficiency under the standards in § 170.454 and notify the Tribe of the required design changes.