Owners and operators must immediately respond to all confirmed releases of regulated substances from UST systems that may pose a threat to human health or the environment, including those confirmed under WAC 173-360A-0720 through 173-360A-0740, in accordance with the requirements of this section.

(1) Within twenty-four hours of confirming a release, the release must be reported to the department.

(2) Within twenty-four hours of confirming a release, the UST system must be secured to prevent further delivery or deposit of regulated substances until the defective UST system components are repaired, replaced, or closed.

(3) Within thirty days of confirming a release, financial responsibility records must be submitted to the department in accordance with WAC 173-360A-1045 (2)(a).

(4) Confirmed releases must be investigated and cleaned up in accordance with chapter 173-340 WAC or as otherwise directed by the department under chapter 90.48 RCW.