Sec. 26.10.05.03. Requirements for Hazardous Substance UST Systems

A. Owners and Operators of hazardous substance UST systems shall provide release detection that meets the requirements of this regulation.

B. Release detection at existing UST systems shall meet the requirements for petroleum UST systems in Regulation .02 of this chapter. By December 22, 1998, all existing hazardous substance UST systems shall meet the release detection requirements for new systems in §C of this regulation.

C. Release Detection. New 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,

(b) Prevent the release of regulated substances to the environment at any time during the operational life of the UST system, and

(c) Be checked for evidence of a release at least every 30 days;

(2) Double-walled 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 precipitation or ground water from entering the liner, and

(c) Surround the tank completely;

(4) Underground piping shall be equipped with secondary containment that satisfies the requirements of §C(1)-----(3) of this regulation;

(5) Underground piping that conveys regulated substances under pressure shall be equipped with an automatic line leak detector in accordance with Regulation .02D(2) of this chapter;

(6) Other methods of release detection may be used if owners and operators:

(a) Demonstrate to the Department that an alternate method can detect a release of the stored substance as effectively as any of the methods allowed in Regulation .04C-----I of this chapter,

(b) Provide the Department with information regarding corrective action technologies for the proposed method, chemical and physical properties of the stored substance, associated health risks, and the physical characteristics of the UST site, and

(c) Obtain approval from the Department to use the alternate release detection method before the installation and operation of the new UST system.