(a) When amending portions of an existing rule, the Arkansas Pollution Control and Ecology Commission's deliberations shall be restricted to those proposed amendments described in the public notice.
(b) Rulemaking proceedings concerning legally required periodic update of rules shall be restricted to Division of Environmental Quality staff proposals.
(c) Nothing in this section shall be construed as a limit upon the right of third parties to petition for the amendment of a rule in separate rulemaking proceedings.