Section 29.2123. Requirements for hazardous substance UST systems.

Section 280.42 is amended to read as follows:

Section 280.42. Requirements for hazardous substance UST systems. Owners and 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 280.41. By December 22, 1998, all existing hazardous substance UST systems shall meet the release detection requirements for new systems in subsection (b) of this section.

(b)   Release detection at new hazardous substance UST systems shall meet all of the following requirements:

(1)   "Secondary containment system," as used in this section means a double- wall tank or integral secondary containment system which is compatible with the substance stored and which is designed, constructed, and installed  to   facilitate  all  of  the following:

(i)     Contain regulated substances released from the tank system until they are detected and removed.

(ii)     Prevent the release of regulated substances to the environment at any time during the operational life of the UST system.

(iii)   Be checked for evidence of a release not less than once every 30 days.

(2)     Double-wall tanks and integral secondary containment systems shall be designed, constructed, and installed to contain a release from any portion of the inner tank within the outer wall and to detect the failure of the inner and outer walls.

(3)   Deleted.

(4)     Underground piping shall be equipped with secondary  containment  that satisfies the requirements of subdivision (1) of this subsection, which is double-wall piping or an integral secondary containment system. In addition, underground piping that conveys regulated substances under pressure shall be equipped with an automatic line leak detector or interstitial  sensor  in accordance with section 280.41(b)(3) and shall be installed to contain a release from any portion of the inner pipe within the  outer wall  and  to detect the failure of the inner and outer wall.

(5)     Other methods of release detection, such  as  external  liners   and vaults, may be used if owners and operators comply with all of the  following provisions:

(i)   Demonstrate to the department that an alternative method can detect a release of the stored substance as effectively as any of the methods  allowed in section 280.43(b) to

(h) can detect a release of petroleum.

(ii)       Provide information to the department on effective corrective action technologies, health risks, and chemical and physical properties of the stored substance and the characteristics of the UST site.

(iii)    Obtain approval from the department to use the alternative release detection method before the installation and operation of the UST syst.

History: 1998-2000 AACS.