It is the purpose of RCW
41.04.405 through
41.04.430 to govern the retirement rights of persons whose employment status is altered when: (1) Two or more units of local government of this state, at least one of which is a first-class city with its own retirement system, enter into an agreement for the consolidated performance of a governmental service, activity, or undertaking; (2) the service, activity, or undertaking is to be performed either by one of the participating local governmental units or by a newly established separate legal entity; and (3) the employees of the participating local governmental units are not all members of the same Washington public retirement system.