(a) An owner or operator of an aboveground storage tank (AST) must comply with the same release reporting, investigation, and corrective action requirements and procedures applicable to underground storage tanks, as prescribed in Subchapter D of this chapter (relating to Release Reporting and Corrective Action), whenever a suspected or confirmed release of a petroleum product from an AST has occurred.(b) An owner or operator of an AST which stores other petroleum substances or hazardous substances which are not petroleum products must comply with the release reporting, investigation, and corrective action requirements prescribed in the Texas Water Code, Chapter 26, Subchapter G.