When the review process identifies areas for improvement:
(a) The regional office must develop a corrective action plan;
(b) BIADOT and FHWA review and approve the plan;
(c) FHWA may provide technical assistance during the development and implementation of the plan; and
(d) The reviewed BIA regional office implements the plan and reports either annually or biennially to BIADOT and FHWA on implementation accomplishments.