(1) The department of ecology, in cooperation with other state agencies and coastal local governments, shall prepare and adopt ocean use guidelines and policies to be used in reviewing, and where appropriate, amending, shoreline master programs of local governments with coastal waters or coastal shorelines within their boundaries. These guidelines shall be finalized by April 1, 1990.

(2) After the department of ecology has adopted the guidelines required in subsection (1) of this section, counties, cities, and towns with coastal waters or coastal shorelines shall review their shoreline master programs to ensure that the programs conform with RCW 43.143.010 and 43.143.030 and with the department of ecology's ocean use guidelines. Amended master programs shall be submitted to the department of ecology for its approval under RCW 90.58.090 by June 30, 1991.