Section 170.520  Release Detection Requirements for Hazardous Substance UST Systems

Owners or operators of hazardous substance UST systems shall provide release detection that meets the following requirements:

a)         Release detection at existing UST systems shall meet the requirements for petroleum UST systems in Section 170.510.  All existing and new hazardous substance UST systems shall meet the release detection requirements for new systems in subsection (b) of this Section and comply with Sections 170.420(a), 170.421(a) and 170.530.

b)         Release detection for hazardous substance UST systems shall meet the following requirements:

1)         Secondary containment systems shall be designed, constructed and installed to:

A)        Contain regulated substances released from the tank system until they are detected and removed and must have interstitial monitoring capable of detecting a failure from the inner and outer wall;

B)        Prevent the release of regulated substances to the environment at any time during the operational life of the UST system;

C)        All interstitial monitoring must be checked every 30 days.  This can be done by keeping reports from an ATG interstitial monitoring system status report tape showing a pass, normal, etc., or by keeping a log showing the date of inspection, initials of inspector, system status (pass, normal, etc.).  The monthly records for the previous 3 years must be kept on site; and

D)        Interstitial monitoring components shall be tested for operation every 3 years and the records for the previous 3 years must be kept on site.  This testing shall be done by a person trained by the manufacturer or a licensed contractor.

2)         Double-wall tanks shall be designed, constructed and installed to:

A)        Contain a release from any portion of the inner tank within the outer wall; and

B)        Detect the failure of the inner wall.

3)         External liners (including vaults) shall be designed, constructed and installed to:

A)        Contain 100 percent of the capacity of the largest tank within its boundary;

B)        Prevent the interference of precipitation or groundwater intrusion with the ability to contain or detect a release of regulated substances;

C)        Surround the tank completely (i.e., it is capable of preventing lateral as well as vertical migration of regulated substances); and

D)        Detect the failure of the tanks and the external liner.

4)         Underground piping shall be equipped with secondary containment that satisfies the requirements of subsections (b)(1) through (3) of this Section (e.g., trench liners, jacketing or double-walled pipe).  In addition, underground piping that conveys regulated substances under pressure shall be equipped with an automatic line leak detector in accordance with Section 170.540(a) and an interstitial monitor in accordance with 170.530(g).

5)         Other methods of release detection may be used if owners or operators:

A)        Demonstrate to the Office of the State Fire Marshal that an alternate method can detect a release of the stored substance as effectively as the method allowed in Section 170.530(g); written approval is required from the Office to use the alternate release detection method before the installation and operation of the new UST system; and

B)        Provide written information to the Office of the State Fire Marshal on effective corrective action technologies, health risks and chemical and physical properties of the stored substance, and the characteristics of the UST site.

(Source:  Amended at 32 Ill. Reg. 1428, effective February 1, 2008)