Authority for the periodic review is based on Washington’s Shoreline Management Act (Ch. 90.58 RCW) and related rules. These amendments were developed by the City to comply with WAC 173-26- 090, which requires all local governments to review their SMPs on an eight-year schedule set in state law, and revise it if necessary. The review ensures the SMP keeps up with changes in state law, changes in other City plans and regulations, and other changed circumstances. The City has elected to use the optional joint review process to combine the local and Ecology comment periods, as allowed under WAC 173-26-104.