N.C. Gen. Stat. § 113A-10

The policies, obligations and provisions of this Article are supplementary to those set forth in existing authorizations of and statutory provisions applicable to State agencies and local governments. In those instances where a State agency is required to prepare an environmental document or to comment on an environmental document under provisions of federal law, no separate environmental document shall be required to be prepared or published under this Article so long as the environmental document or comment meets the provisions of this Article.