Wash. Rev. Code § 36.70A.050
(1) Subject to the definitions provided in RCW 36.70A.030, the department shall adopt guidelines, under chapter 34.05 RCW, no later than September 1, 1990, to guide the classification of:
(2) In carrying out its duties under this section, the department shall consult with interested parties, including but not limited to:
[ 1990 1st ex.s. c 17 s 5.]