Under WAC 463-68-060, construction may start, or restart if construction has been suspended, only upon the council finding that no changes or amendments to the site certification agreement, regulatory permits, or project-related environmental documents are necessary or appropriate, or upon the council's approval of any necessary or appropriate changes or amendments. The council may retain an independent consultant, at the certificate holder's expense, to evaluate and make recommendations about whether changes to the site certification agreement, regulatory permits, or project-related environmental documents are necessary or appropriate. This work may include, but is not limited to, verification of project-related environmental conditions, regulatory requirements, or appropriate technology.