Wash. Rev. Code § 36.73.180
(2) Upon receipt of a petition as provided in subsection (1) of this section for supplemental transportation improvements that are to be fully funded by the petitioner city, including ongoing operating and maintenance costs, the district must:
(3) Upon receipt of a petition as provided in subsection (1) of this section for supplemental transportation improvements proposed to be partially or fully funded by the district, the district must:
[ 2010 c 251 s 3.]