(a) An owner or operator of a Class A or B petroleum-substance contaminated soil storage, treatment, or reuse facility subject to this subchapter shall establish financial assurance for the closure of the facility that meets the requirements of this section, in addition to the requirements specified under Subchapters A, B, C, and D of this chapter (relating to General Financial Assurance Requirements; Financial Assurance Requirements for Closure, Post Closure, and Corrective Action; Financial Assurance Mechanisms for Closure, Post Closure, and Corrective Action; and Wording of the Mechanisms for Closure, Post Closure, and Corrective Action).(b) An owner or operator subject to this subchapter may use any of the financial assurance mechanisms as specified in Subchapter C of this chapter to demonstrate financial assurance for closure, except a pay-in trust mechanism may not be used.