Oregon Revised Statutes Public Health and Safety § 468.163

For purposes of ORS 468.155 to 468.190, the construction or installation of a facility is commenced when the person constructing or installing the facility has obtained all necessary preliminary approvals and has begun continuous on-site modification, construction, installation or other activity, the completion of which will cause the person to be able to obtain certification under ORS 468.155 to 468.190. Interruptions and delays resulting from natural disasters, strikes, litigation or other matters beyond the control of the owner shall be disregarded in determining whether the actions undertaken by the person are continuous. The burden of demonstrating that construction or installation of a facility is commenced shall be borne by the person filing an application for certification under ORS 468.165.