USPS is reminding postal facilities with aboveground storage tanks that monthly visual inspections of the containers are required.
Aboveground storage tanks, or ASTs, are used to store oil, antifreeze, heating oil and other hazardous chemicals.
The Postal Service could be held liable if chemicals inside the ASTs — which are usually made of fiberglass, plastic or metal — leak into the environment.
Monthly inspections help confirm the ASTs are secure.
The Aboveground Storage Tank Environmental Compliance Bulletin has more information.