The cooperative agreement shall allow the department to request a temporary construction easement from the Lummi Nation for the purpose of constructing the new road. The cooperative agreement shall also reserve to the governing authority of the Lummi Nation authority to construct road intersections or grade separation crossings of the roadway, in accordance with applicable laws. The agreement may also authorize the governing authority of the Lummi Nation to convey to the United States an easement to construct, maintain, and repair roadway improvements if such an easement is required by regulations of the bureau of Indian affairs.