Section 175.400  Design and Construction of USTs

a)         Tanks.  Any newly installed or replaced underground tank shall be of double-wall construction and equipped with interstitial monitoring that meets the applicable requirements of Section 175.630(g) and 40 CFR 280.43(g) for all permits issued on February 1, 2008 and after.  Any release into the interstice of any double-wall tank shall require that the interstice be cleaned under accepted engineering practices before the tank can be put back into service, the out-of-service period not to exceed one year.  Although such work does not require a permit, the work must be scheduled with OSFM under Section 175.320 and the work must be done by a contractor that meets the licensing and certification requirements for a tank precision tester under 41 Ill. Adm. Code 176.470 and 41 Ill. Adm. Code 172.  (See also Section 175.630(g).) If the interstice cannot be cleaned so as to allow proper functioning of the interstitial monitoring and the tank has been out-of-service for one year, then the tank shall be removed within 60 days. Third-party listed, factory manufactured, jacketed tanks having an interstitial space capable of being cleaned following any contamination shall be considered as meeting the double-wall requirement. 

b)         Each newly installed, replaced and existing tank shall be properly designed, constructed and installed in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory and third-party listed for its intended use. Any portion underground that routinely contains product shall be protected from corrosion. In addition, each tank shall meet one of the following requirements:

1)         The tank is constructed of fiberglass-reinforced plastic.

2)         The tank is constructed of steel and protected in the following manner:

A)        Metallic tanks installed on or after April 21, 1989 shall be thoroughly coated on the outside with suitable rust-resisting dielectric material; and

B)        All steel tanks shall utilize a cathodic protection system designed by a corrosion expert certified by NACE in cathodic protection design or by an Illinois Licensed Professional Engineer who has certification or licensing that includes education and experience in corrosion control of buried or submerged metal piping systems and metal tanks. If an impressed current system is selected, it must also be designed to allow determination of the system's operating status by means of permanently installed lights and gauges as required in Section 175.510. 

3)         The tank is constructed of a steel-fiberglass-reinforced plastic composite.

4)         The tank construction and corrosion protection are determined by OSFM to be designed to prevent release or threatened release of any stored regulated substance in a manner that is no less protective of human health and the environment than this subsection (b). Before the installation of any tank, its construction and corrosion protection shall be submitted to OSFM, in writing, and is subject to written approval by OSFM.

c)         Re-certified tanks shall satisfy the requirements of subsection (b), and, on or after February 1, 2008, shall be double-walled with interstitial monitoring; however, written proof of re-certification shall be submitted to OSFM. Re-certified tanks must be reinstalled within 6 months after removal or re-certification, whichever is sooner. Re-certified tanks must have a warranty remaining for at least 5 years. Re-certifications must be conducted by a Licensed Professional Engineer having expertise in UST design or the original tank manufacturer.