Each county and city that is required or chooses to plan under RCW 36.70A.040
shall establish and broadly disseminate to the public a public participation program identifying procedures providing for early and continuous public participation in the development and amendment of comprehensive land use plans and development regulations implementing such plans. The procedures shall provide for broad dissemination of proposals and alternatives, opportunity for written comments, public meetings after effective notice, provision for open discussion, communication programs, information services, and consideration of and response to public comments. In enacting legislation in response to the board's decision pursuant to RCW 36.70A.300
declaring part or all of a comprehensive plan or development regulation invalid, the county or city shall provide for public participation that is appropriate and effective under the circumstances presented by the board's order. Errors in exact compliance with the established program and procedures shall not render the comprehensive land use plan or development regulations invalid if the spirit of the program and procedures is observed.