Except as otherwise expressly provided in this division, enactment of this division does not increase, decrease, duplicate, or supersede the authority of any existing state agency.

This chapter does not limit in any way the regulatory controls over development provided in Chapters 5 (commencing with Section 29400) and 6 (commencing with Section 29500); except that the commission may not set standards or adopt regulations that duplicate regulatory controls established by any existing state agency pursuant to express statutory requirements or authorization.