The provisions of this chapter are deemed to provide an additional, alternative, and complete method for accomplishing the purposes of this chapter, and are deemed and construed to be supplemental and additional to, and not in derogation of, powers conferred upon the corporation and the department by any other laws; provided, however, that insofar as the provisions of this chapter are inconsistent with the provisions of any general or special law, municipal charter, administrative order or regulations, the provisions of this chapter are controlling.