Hafa Adai! The Guam Environmental Protection Agency (Guam EPA) would like to remind owners and operators of Underground Storage Tanks (UST) containing regulated substances that they are required by the Underground Storage of Regulated Substances Act, as amended, Chapter 76 of Title 10 Guam Code Annotated, and Title 22 Guam Administrative Rules and Regulations Chapter 50 Underground Storage Tank Regulations, to apply for a UST operating permit with the Agency.