This Model Regional Review Plan (MRRP) describes how technical reviews will be conducted for decision and design documents, as applicable, for Environmental Infrastructure (E.I.) projects. These projects typically involve reimbursing the non-Federal Sponsors for design and construction work they perform on the installation or renovation of water supply and wastewater treatment facilities, environmental restoration, harbor development and expansion, and surface water resource protection and development, as specifically authorized for each E.I. Program. This is in accordance with EC 1165-2-209, Appendix B, which implies, “programmatic or regional model review plans may also be appropriate in other instances, such as regional environmental infrastructure authorities.” This model regional review plan is being prepared for the referenced seven authorities and would serve as an “umbrella” document under which specific Project Management Plans (PMPs) would be developed. Specific PMPs would address project scope, schedule, and cost.