(1) The agency must adopt rules under chapter 34.05 RCW as necessary to carry out the provisions of this chapter. To accelerate remedial actions, the agency may implement the program through interpretative guidance pending adoption of rules.

(2) The department of ecology must adopt rules under chapter 34.05 RCW to enable use of the program authorized under this chapter to meet the financial responsibility requirements of chapter 70A.355 RCW. The rules must be consistent with and no less stringent than the federal regulations.