(1) Agency SEPA procedures shall apply to any proposal initiated after the effective date of the lead agency's SEPA procedures or those of the agency proposing the action.

(2) For proposals made before the effective date of revised lead agency SEPA procedures, the revised procedures shall apply to those elements of SEPA compliance initiated after the procedures went into effect. Agency procedures adopted under RCW 43.21C.120 and these rules shall not be applied to invalidate or require modification of any threshold determination, EIS or other element of SEPA compliance undertaken or completed before the effective date of the procedures of the lead agency or of the agency proposing the action.

(3) Agencies are responsible for compliance with any statutory requirements that went into effect before the adoption of these rules and agency SEPA procedures (for example, the statutory requirements for appeals).