WAT § 1433.6

The board may renew a permit issued under this article if the board, in its judgment, concludes that the applicant has exercised due diligence in applying for a permit pursuant to provisions of this division, other than this chapter, and in pursuing that application once it is filed. The board shall process a request for a renewal of a permit issued under this article pursuant to this article. The board may request the permittee to file maps, drawings, or other data furnished with the original application for the permit. Each renewal of a permit issued under this article shall be valid for a period not to exceed five years from the date of renewal.