Wash. Rev. Code § 90.03.640
(1) Upon the receipt of adjudication claims and the filing of claimants' evidence, the department shall conduct a preliminary investigation for the purpose of examining:
(2)
(a) The examination may include, as the department deems appropriate:
(3) The department shall file with the court the department's report of findings as to each adjudication claim filed timely under RCW 90.03.140. The department may divide its report of findings into two or more segments, covering particular drainages, uses, or other appropriate bases for dividing the report on adjudication claims. Based on the evidence filed by claimants and the department's report of findings, the department shall file with the superior court either or both of the following motions:
[ 2009 c 332 s 9.]
Application—2009 c 332: See note following RCW 90.03.110.