Underground Storage Tank (UST) Removal

The only way to be 100% certain an underground storage tank (UST) has not leaked is to remove it or properly close it in place. Cohesion has removed hundreds of home heating oil tanks; these include above ground storage tanks (AST) and underground storage tanks (UST) in crawl-spaces, basements, adjacent to foundations, beneath foundations, beneath decks, and beneath home additions. Some tanks cannot be removed and must be ‘closed-in-place’ due to site circumstances.

Closing a tank in place does not mean filling it with foam or sand and walking away; you still do not know if it leaked. What can filling the tank with foam, sand, or whatever tell you about the condition of the tank or if it leaked? The tank was in the ground for years, with oil in it. What if the tank was leaking before being foam or sand-filled? What if some oil remained in the tank, and foam or sand was poured in; the oil will still settle in the bottom of the tank and leak out if corrosion causes a hole in the tank. The property owner said they used all the oil or had it pumped out; even if they did, some oil always remains.

To properly close a tank in place, Cohesion cuts a hole in the top of the tank, cleans the interior of the tank, cuts holes in the bottom of the tank to access the soil beneath, and collects soil samples to determine if there was a leak. If the tank did not leak, it can be filled with an inert material. If the tank is in a location where structural support is necessary, a suitably supportive material should be put in the tank.

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