[Code of Federal Regulations] [Title 40, Volume 26] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR281.31] [Page 576] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 281_APPROVAL OF STATE UNDERGROUND STORAGE TANK PROGRAMS--Table of Contents Subpart C_Criteria for No-Less-Stringent Sec. 281.31 Upgrading existing UST systems. In order to be considered no less stringent than the corresponding federal upgrading requirements, the state must have requirements that ensure existing UST systems will be replaced or upgraded before December 22, 1998, to prevent releases for their operating life due to corrosion, and spills or overfills.