If a tentative agreement has been reached, before the commission may take any action on such agreement, an executive summary describing all material elements of the agreement must be prepared and made available to the public. The department must publish notice of existence of the agreement in each county that is, or could potentially be, affected by the project. The published notice must generally describe the nature of the project, the anticipated communities that the project might impact, and how summary level information on the proposed agreement can be obtained. Such notice must be provided not less than twenty calendar days before the public hearing required under WAC 468-600-741.