SECONDARY CONTAINMENT consists of placing a
barrier - such as a vault, leakproof liner,
or double-walled structure - around the underground storage tank or
pipe. Any leaked product from the inner tank or pipe is directed
towards an "interstitial" monitor located between the inner
tank/pipe and the outer barrier.
INTERSTITIAL MONITORING methods range from a
simple dip stick to a continuous automated vapor or liquid sensor
that is permanently installed in the system. The most difficult and
important aspect of this leak detection method is the proper
installation of the secondary confinement barrier. Trained and
experienced installers should be sought.
SITE-SPECIFIC FACTORS
Site conditions (ex. too much water) may require use of containment that completely surrounds tank and/or piping.
TANK-RELATED FACTORS
A double-walled system must be able to detect a release through the inner wall.
COST FACTORS
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