Secondary Containment with Interstitial Monitoring (Tanks & Pipes)

Secondary Confinment Tank 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

  1. Total installed cost per tank: $5,000 - $12,000.

  2. Total installed cost for double walled piping for a typical 3 tank station is $10,000, excluding trenching costs. Cost varies with pipe size, length, site conditions, and contractor. Double walled piping systems cost 3 times as much as single walled systems.

  3. Trench liners: $20 - $40 per linear foot for 2 inch pipe, depending on the number of pipes. Liner installation cost ranges from $800 to $1,500 depending on site conditions.

  4. Monitors: range from a negligible sum for dipsticks, to $1,000 for an electronic sensor, excluding the cost of a control panel.

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