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An underground tank storage (UTS) system includes one or more storage tanks disposed within a vault. The vault may comprise a plurality of concrete sections arranged in mirror image about a horizontal mid-plane. Center sections are U-shaped, having a horizontal panel and end walls, and are arranged

An underground tank storage (UTS) system includes one or more storage tanks disposed within a vault. The vault may comprise a plurality of concrete sections arranged in mirror image about a horizontal mid-plane. Center sections are U-shaped, having a horizontal panel and end walls, and are arranged in upright and inverted pairs. End sections are also U-shaped with an additional wall extending between the legs of the section. These likewise are arranged in upright and inverted pairs. The vault sections are sealingly secured together with grout keys and joint tape. A suitable material resistant coating is disposed on the lower interior surface. An inert gas atmosphere is maintained within the vault. The inert gas provides an oxygen and moisture free atmosphere which improves the service life of the tanks, enhances safety and leak detection capability and inhibits the likelihood of combustion. Vapor or liquid leak sensors are provided to sense and respond to a tank leak which develops in the vault.

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A material containment system comprising, in combination, a vault defining a substantially gas impervious interior volume, said vault comprising a plurality of sections in juxtaposition, said sections defining joints therebetween, means for maintaining said vault sections in juxtaposition, means for

A material containment system comprising, in combination, a vault defining a substantially gas impervious interior volume, said vault comprising a plurality of sections in juxtaposition, said sections defining joints therebetween, means for maintaining said vault sections in juxtaposition, means for providing a substantially gas impervious seal at said joints of said sections, storage means disposed within said vault for receiving a quantity of a material, at least one access means for providing access to the interior of said vault, said access means including seal means for providing a substantially gas impervious seal between said access means and said vault, and means for providing inert gas to said interior of said vault.