The purpose of an advisory committee shall be to give the commission the benefit of the members' collective business, environmental, and technical expertise and experience with respect to matters within the commission's jurisdiction. An advisory committee's sole duty is to advise the commission. An advisory committee has no executive or administrative powers or duties with respect to the operation of the commission, and all such powers and duties rest solely with the commission. The specific purposes and tasks of an advisory committee subject to this subchapter shall be identified by commission resolution.