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The Underground Storage Tank (UST) regulations were first promulgated in 1988 primarily to prevent releases from retail petroleum marketers (gas stations) and other facilities into the environment. These regulations have reduced the incidents of contamination. However, there is a need to revise the regulations to incorporate changes to the UST program from the Energy Policy Act of 2005, as well as to update outdated portions of the regulations due to changes in technology since the 1980s. On August 8, 2005, President Bush signed the Energy Policy Act of 2005 (EPAct). Title XV, subtitle B of this act (entitled the Underground Storage Tank Compliance Act of 2005), amends subtitle I of the Solid Waste Disposal Act, the original legislation that created the UST program. There are key provisions of the EPAct that apply to States receiving federal UST funding but do not apply in Indian Country, including requirements for secondary containment and operator training. The EPA will also use our knowledge of the program gained over the last 20 years to update and revise the regulations to make targeted changes to improve implementation and prevent UST releases. In the NPRM, the EPA proposed: adding secondary containment requirements for new and replaced tanks and piping, adding operator training requirements, adding periodic operation and maintenance requirements for UST systems, removing certain deferral, adding new release prevention and detection technologies, updating codes of practice, making editorial and technical corrections, and updating state program approval requirements to incorporate these new changes.