Tanks and piping may be constructed of fiberglass, coated steel (asphalt or paint), or metal without additional cor rosion protection. If constructed of coated steel, tanks and piping must also contain corrosion-protection devices such as cathodic protection systems. Such corrosion-protection devices must be regularly inspected. If constructed of metal without corrosion protection, records must be maintained showing that a corrosion expert has determined that the site is not corrosive enough to cause leaks during the tank's operating life. Tanks must be installed properly and precautions must be taken to prevent damage.
Information on the design (including corrosion protection), construction, and installation of tanks and piping is available on notification forms filed in the designated state office, usually the state UST office. Reports of inspections, monitoring, and testing of corrosion protection devices are on file at the UST site or must be made available to the implementing agency upon request.
Recent developments in preventing leakage include using asphalt coated steel tanks, double-walled fiberglass tanks, double-walled steel tanks, epoxy-coated steel tanks, fiberglass-coated steel tanks, fiberglass-coated doublewalled tanks, synthetic underground containment liners, and tanks placed in subgrade vaults (see Figure 11.19.2). Some suppliers offer double-walled pipes for added safety. Lined trenches offer secondary containment for singlewalled pipes.
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