Installation and Construction

Note - These general recommendations apply to all underground storage tanks (USTs), regardless of size. Check for additional requirements in your state.

Underground Storage Tank

INSTALLATION of an underground storage facility must be done with great care to maintain the integrity of the corrosion protection. The tank should be buried in a well drained area and placed on a firm foundation of crushed stone. Surround the tank with 6-12 inches of well tamped, non-corrosive inert material, such as clean sand or gravel. Cover the tank with a minimum of 2 ft. of earth.

If vehicles will pass over the tank, protect it with a 3 ft. earth cover. Eighteen inches of earth and either 6 inches of reinforced concrete or 8 inches of asphaltic concrete may also be employed.

The tank can't be located in a position that undermines the foundation of an existing structure. The load carried by the building above shall not be transferred to the tank. The distance from any part of the tank to the nearest wall of any basement, pit, cellar, or property line shall not be less than 3 feet.

Install the vent 12 ft. high in the air so it discharges away from possible ignition sources. The vent opening should be 1-1.5 inches in diameter.

Pumps for underground tanks should never be located indoors. Leave at least a 3 ft. space between pump and building so any refueling mishap will not endanger the structure. Label pumps as to the kind of fuel they contain. Post "no smoking" signs and enforce the rule.

A tamper proof nozzle arrangement and lockable master power switch located inside the nearest building will keep children and unauthorized persons from operating the pumps.


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