(1) An SEIS shall be prepared in the same way as a draft and final EIS (WAC 197-11-400 to 197-11-600), except that scoping is optional. The SEIS should not include analysis of actions, alternatives, or impacts that is in the previously prepared EIS.

(2) The fact sheet and cover letter or memo for the SEIS shall indicate the EIS that is being supplemented.

(3) Unless the SEPA lead agency wants to prepare the SEIS, an agency with jurisdiction which needs the SEIS for its action shall be responsible for SEIS preparation.