Contamination caused by leaky USTs often may not be detected until it is widespread, and difficult and expensive to correct. Regular tests and inspections of tanks and piping are necessary to ensure that leaks are detected early and prevented promptly. The extent of releases and their migration are characterized to plan corrective actions.
If a tank is leaking more than 0.05 gph, it is a leaker. Less than 0.05 gph is beyond the scope of measurement ability and the tank is considered tight. Present technology is imprecise in detecting leaks smaller than 0.05 gph. This standard is listed in NFPA 329, Final Test, now renamed Precision Test.
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