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Statistical Inventory Reconciliation (SIR)

How does the release detection method work?

For statistical inventory reconciliation (SIR), typically, a trained professional uses sophisticated computer software to conduct a statistical analysis of inventory, delivery, and dispensing data, which you must both collect and supply to the vendor on a regular basis.

SIR methods are distinguished from continuous in-tank leak detection methods by how inventory, delivery, and dispensing data are processed and provide a determination of the release status of the tank (or piping). SIR data are processed on a periodic basis involving a separate analysis that is performed either by a SIR vendor or SIR software. Continuous statistically based in-tank release detection methods process data on an on-going basis occurring in an uninterrupted or nearly uninterrupted manner.

The features of SIR are:

What are the regulatory requirements?

Will it work at your site?

Anything else you should consider?

Will you be in compliance?

For USTs installed on or before April 11, 2016 owners and operators may use SIR as their primary method of release detection. When installed and operated according to the manufacturer's specifications, SIR meets the federal release detection requirements as follows:

USTs installed or replaced after April 11, 2016 may no longer use SIR as the primary method of release detection. USTs must be secondarily contained and use interstitial monitoring.

Additional Information on SIR

Publications that more fully explain SIR:

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