Underground Tank Closure in Place
Closing an underground storage tank in place involves more than just filling the underground tank with a solid, inert material. The cost of a tank closure in place is typically more than that of an underground tank removal. To help you understand what is involved for a tank closure in place, the following are a list of required steps.
- An application for a permit must be submitted and approved by the Fire Department to close the underground tank in place.
- A tank inspector must perform a closure assessment, which includes a visual inspection.
- The fire department may require a structural engineer to inspect the site.
- The tank must be pumped of fuel and transferred to a truck and fumes inside the tank must be evacuated.
- The ground needs to be excavated and the tank has to be cut open for the crews to climb inside and remove the tank bottom sludge.
- If the tank were not easily accessible then soil borings on two sides of the tank must be taken to ensure the soil surrounding the tank is clean.
- A soil sample must be collected from under the tank and sent to a lab for analysis. The closure assessment report and the UST closure notice are created utilizing the data from the lab samples.
- When groundwater is present, monitoring wells need to be installed to take accurate water samples.
Cost Comparison of an Underground Tank Closure in Place Versus Tank Removal
The following are example prices for a tank closure in place versus an underground tank removal for a 1000-gallon underground fuel storage tank.
- Cost of a UST Closure in Place: $4,600
- Cost of a UST Removal: $3,200
We recommend having an underground tank removed. When structural issues are a concern, the building or wall can be supported during the removal process. A large tank can be cut into smaller sections while the surrounding soil is supported and removed a section at a time. An underground tank removal is generally recommended whenever possible to avoid future problems or questions concerning the underground storage tank.