Organization Information

Environmental Management

Monthly Inspections for Aboveground Storage Tanks

Aboveground Storage Tanks (ASTs) must be inspected at least once a month to comply with regulatory requirements and Postal Service™ policy outlined in Administrative Support Manual, Chapter 69, “Environmental Management and Compliance.” The monthly inspection requirement applies to ASTs of any size that contain hazardous materials, such as:

n New and used oil or heating oil.

n Gasoline or diesel fuel.

n New and used antifreeze.

n Windshield washer fluid.

n Diesel exhaust fluid.

These inspections help prevent the release of oil or other hazardous materials into the environment.

Under the policy, the site installation head or their designee must:

n Conduct and document a monthly visual inspection of each AST.

n Ensure each AST has a label that identifies the contents and volume.

n Address any issues identified during the inspection.

n Promptly address spills and take appropriate response actions.

Sites that store oil volume greater than 1,320 gallons have a dedicated Spill Prevention, Control, and Countermeasure (SPCC) Plan. Sites with SPCC Plans must use the inspection log in the site-specific SPCC Plan.

Additionally, for all sites with ASTs, the installation head is responsible for:

n Obtaining access to the Environmental Tool Kit (ETK) or directing an EAS designee to gain access for the facility. Note: EAS employees may request access to ETK through eAccess for environmental information on their site.

n Uploading required environmental records to ETK (including the SPCC Plan with the current installation head signature pages) and maintaining a hard copy of the monthly SPCC inspection log provided in the plan in the on-site environmental files.

n Signing and certifying the SPCC Plan, if required for the site. The SPCC Plan signature/certification pages must contain the current installation head’s name and signature. In the event of a management change, the new installation head must take the SPCC Plan Training in HERO and update the signature/certification pages with their signature.

For more information, use the following resources:

n The ETK website at provides detailed instructions on requesting access to ETK and uploading a document.

n The AST Management Environmental Compliance Bulletin at

n The SPCC Plans Environmental Compliance Bulletin at

n The AST Inspection video (available for credit in HERO) provides basic instruction on how to inspect ASTs at

n The “Environmental Spill Prevention Control and Countermeasures (SPCC) Plan” training course in HERO is required for the installation head and employees on-site with AST responsibilities.

n For questions, speak to your designated environmental contact at