What Makes an Oil Tank ‘Decommissioned’?

oil tank Certification

Getting a certification for the decommissioning of an underground storage tank requires doing a few things. Mostly in order to make sure the tank doesn’t pose a health risk now or in the future.

HOTs or any UST that is being decommissioned have to meet a few requirements in order to be considered valid by the DEQ and to get an official decommissioning letter.

The tank must be empty and clean, so that nothing else can leak out of it later. If the tank has clean soil samples then decommissioning in-place can happen.

The soil around the tank must have had little or no environmental impact. Oregon and Washington have different rules regarding the exact amount leakage that requires mitigation via soil removal. This step requires soil samples taken at specific locations and depths. Then there is a transfer of the soil samples and a legal chain-of-custody form to an analytical laboratory.

The clean and empty tank must be backfilled with a space-filling and inert material. This is so there is no sinkhole or depression when the steel tank eventually rusts away.

After reaching these requirements the tank becomes eligible for certification. Once proof of the work and soil sample results are ready the DEQ can review the report for approval.

The state of Oregon actually allows homeowners to do their own decommissioning. If you are planning to buy a home where the homeowner did the work we suggest taking another set of soil samples to verify the work. If you would like to see the heating oil tank service providers with a state license, click here.