Mich. Admin. Code R. 29.2111 - Upgrading existing UST systems

Rule 11. Section 280.21 is amended to read as follows:

Section 280.21. In accordance with subpart G, owners and operators shall permanently close any UST system that does not meet the new UST system performance standards in section 280.20 or has not been upgraded in accordance with subsections (b) to (d) of this section. This does not apply to previously deferred UST systems described in subpart K of these rules and where an upgrade is determined to be appropriate by the implementing agency.

(a) Alternatives allowed. All existing UST systems must comply with 1 of the following requirements:

(1) New UST system performance standards under section 280.20.

(2) The upgrading requirements of subsections (b) to (d) of this section.

(3) Closure requirements under subpart G of these rules, including applicable requirements for corrective action under subpart F of these rules.

(b) Tank upgrading requirements. Steel tanks must be upgraded to meet the provisions of subsection 280.20(d) and 1 of the following requirements:

(1) Interior lining. Tanks upgraded by internal lining must meet the following:

(i) The lining is installed in accordance with the requirements of section 280.33 and within 10 years after lining and, every 5 years thereafter, the lined tank is internally inspected in accordance with paragraph (ii)(A) to (I) of this subdivision and found to be structurally sound with the lining still performing in accordance with the original design specifications. If the internal lining is no longer performing in accordance with original design specifications and cannot be repaired in accordance with a code of practice developed by a nationally recognized association or independent testing laboratory, then the lined tank shall be permanently closed in accordance with subpart G of these rules.

(ii) After the tank is internally inspected and determined to be eligible for upgrading, the interior lining shall be applied in compliance with the American petroleum institute (API) recommended practice 1631 or the national leak prevention association (NLPA) standard 631 and shall be certified by the same methods specified in subsection 280.20(e). In addition, all of the following requirements must be met:

(A) Personnel shall be certified by a national organization acceptable to the department or certified in nondestructive testing, level I competence, in accordance with the guidelines specified by the American society for nondestructive testing entitled, "ASNT Standard for Qualification in Nondestructive Testing Personnel, CP-189-2011" including being certified in administering training to, and examining and retesting, personnel for certification of tank entry, surface preparation, inspection, ultrasonic thickness gauging, manway closure, and testing.

(B) Equipment used for ultrasonic thickness gauging must have a minimum measurement range of 0.050 inches to 2 inches and a minimum resolution of 0.002 inches.

(C) After the tank has been emptied, the internal tank surfaces shall be cleaned as required for the use of ultrasonic thickness gauging.

(D) For gauging measurement control, tank walls and heads must be divided into sections. Measurements for tank walls shall be divided into 3-foot by 3-foot sections beginning at the fill end of the bottom of the tank and extending outward around the tank circumference and along the tank length. Any additional area of the tank wall that is less than 3 feet by 3 feet shall be measured and treated as an additional section. Measurement for tank heads shall divide the tank head into 4 equal divisions by establishing horizontal and vertical diameter lines as axes. Each division shall be divided into 3-foot by 3-foot sections beginning at the center point and extending outward on each axis line. Any additional area of the tank head that is less than 3 feet by 3 feet shall be measured and treated as an additional section.

(E) Section gauging. Thickness gauging measurements shall be taken in the center of each section of the tank wall and heads. Thickness readings of 75% or less of the original wall thickness as specified in underwriters laboratories standard 58 (UL 58) shall require further gauging as prescribed for readings or more than 75% of the original wall thickness as specified in UL 58 shall be reported as the average wall thickness for the section.

(F) Gauging section subdivisions. Sections that have a center gauge measurement of 75% or less than the original wall thickness as specified in UL 58 shall be subdivided into 9 equal subdivisions. Thickness gauging for each of the subdivisions shall be taken at the center of each subdivision. The subdivision thickness readings shall then be averaged to get the average wall thickness for the section.

(G) Thin wall target area gauging. Areas that have a thickness gauging measurement less than 50% of the original wall thickness as specified in UL 58 must each receive 8 additional readings. Four of the 8 readings must be equally spaced readings and each of the 4 readings must be at a 1 1/2 inch radius from the initial reading. The 4 other readings must be equally spaced readings each at a 3-inch radius from the initial reading. The average of the 8 readings must be reported as the average reading of the thin wall target area.

(H) Perforations. Perforations must be identified and reamed to establish a minimum of 1/8 of an inch edge wall thickness before any repairs. Eight thickness measurements must be taken around the perforation in the same pattern as described in subparagraph (G) of this paragraph. The 8 thickness measurements shall be averaged and the average shall be reported for the subdivision closest to the perforation.

(I) Average tank wall thickness. The average tank wall thickness must be established by averaging all of the section thicknesses reported. Thickness gauge readings must be reported on an ultrasonic thickness gauging report form that conforms to the requirements of subparagraphs (D) to (H) of this paragraph.

(J) Thin wall. The presence of any region that has less than 1/8 of an inch of metal due to internal or external corrosion or both internal and external corrosion requires that the tank be provided with an additional layer of lining material or have a 1/8 of an inch thick steel plate that has minimum dimensions of 8 inches by 8 inches and that is rolled to the contour of the tank and welded on all seams in a continuous manner covering the thin wall area of the tank.

(K) A tank is eligible for upgrade by lining only if the average wall thickness as described in subparagraph (I) of this paragraph was found to be more than 75% of the original wall thickness required under the UL 58 standard and if all of the following requirements are met:

(a) None of the perforations shall be larger than 1 inch in diameter, except under the gauging opening, where the perforation is not more than 2 1/2 inches in diameter.

(b) A tank shall not have more than 4 perforations that are 1/2 inch in diameter in any 1 square foot area of the tank internal surface.

(c) A tank shall not have more than 20 perforations that are 1/2 inch in diameter in any 500 square foot area. The total number of perforations shall not be more than 2 for every year of the age of the tank.

(L) A tank is not eligible for upgrade if it does not meet the requirements of subparagraph (K) of this paragraph before any repairs. A tank that fails to meet the eligibility requirements for upgrade is required to be replaced or permanently closed in compliance with subsection (a)(3) of this section.

(M) All internally inspected tanks that meet the upgrading requirements by internal lining must be provided with a 1/4 inch thick steel striker plate that has minimum dimensions of 8 inches by 8 inches and that is rolled to the contour of the tank and welded on all seams in a continuous manner under the fill tube.

(N) Interior tank walls shall be abrasive blasted in accordance with the steel structures painting council (SSPC) standard SP 5 entitled "White Metal Blast Cleaning" and must not have any perforations.

(O) A suspected release meeting the requirements of section 280.50 shall be reported if there are indications of a release or if perforations are found in the tank before the addition of tank lining.

(iii) The department shall approve all lining materials and procedures. Each lining manufacturer must maintain and submit a current list of qualified applicators to the department. Lining thickness shall be 100-mil dry film thickness or greater.

(iv) The O/O shall notify the department of all tank linings not less than 15 days before any work is performed, unless the department is notified of and approves an emergency repair. Notification of the lining must be on a form provided by the department. A qualified applicator shall perform any tank lining.

(v) The lining company shall provide the owner with a complete report of the tank evaluation, as well as the design, installation, and operational requirements of the lining system. The lining company responsible for the lining upgrade shall sign the report.

(2) Cathodic protection. Tanks upgraded by cathodic protection must meet the requirements of section 280.20(a)(2)(ii), (iii), and (iv) and all of the following provisions:

(i) The integrity of the tank is ensured using 1 of the following methods:

(A) The tank was internally inspected and assessed to ensure that the tank was structurally sound and free of corrosion holes prior to installing the cathodic protection system.

(B) The tank has been installed for less than 10 years and is monitored monthly for releases in accordance with subsections 280.43(d) to (i).

(C) The tank has been installed for less than 10 years and is assessed for corrosion holes by conducting 2 tightness tests that meet the requirements of subsection 280.43(c). The first tightness test must be conducted before installing the cathodic protection system. The second tightness test must be conducted between 3 and 6 months after the first operation of the cathodic protection system.

(D) The tank is internally inspected and assessed to ensure that the tank is structurally sound and free of internal corrosion and corrosion holes before installing the cathodic protection system. All personnel involved in the internal inspection related activities shall be qualified in accordance with subparagraph (1)(ii)(A) of this subsection and shall conduct the ultrasonic thickness gauging in accordance with subparagraphs (1)(ii)(B) to (G) of this subsection, with the average wall thickness established by averaging all the section thicknesses reported. A tank is eligible for upgrade by cathodic protection alone if the average wall thickness is not less than 75% of the original wall thickness specified in the UL 58 standard.

(E) The tank is assessed to determine its eligibility for upgrade by cathodic protection by other means determined by the department to prevent releases in a manner that is at least as protective to human health and the environment as the protections specified in subparagraphs (i)(A) to (C) of this subdivision.

(ii) The corrosion expert responsible for the design and the installation of the cathodic protection system shall provide the owner with a complete report of all of the results of any corrosion protection investigations, as well as the design, installation, and operational requirements of the cathodic protection system. The corrosion expert shall sign the report.

(iii) All internally inspected tanks that meet the upgrading requirements by cathodic protection must be provided with a 1/4 inch thick steel striker plate that is not less than 8 inches by 8 inches and that is rolled to the contour of the tank and welded on all seams in a continuous manner under the fill tube.

(iv) The O/O shall notify the department of all cathodic protection upgrades not less than 15 days before any work is performed, unless the department is notified of and approves an emergency repair. Notification of cathodic protection upgrade shall be on a form provided by the department. Cathodic protection upgrade must be performed under the direct supervision and instruction of a corrosion expert.

(v) A suspected release meeting the requirements of section 280.50 shall be reported when there are indications of a release, such as visual or olfactory presence of product in the soil, before the addition of cathodic protection.

(3) Internal lining simultaneously combined with cathodic protection. A tank may be upgraded by both internal lining and cathodic protection if all of the following provisions are complied with:

(i) Not more than 1 month is allowed between the lining and the installation of cathodic protection.

(ii) The lining is installed in accordance with the requirements of section 280.33 and paragraphs (1)(ii) to (v) of this subsection.

(iii) Internal inspection requirements will be waived if the lining and the cathodic protection upgrade are done within 1 month of each other.

(iv) The cathodic protection system meets the requirements of subdivision (2) of this subsection.

(4) Other methods approved by the department.

(c) Piping upgrading requirements. Metal piping that routinely contains regulated substances and that is in contact with the ground must be cathodically protected in accordance with the provisions of subsection 280.20(d) and must meet the requirements of paragraphs 280.20(b)(2)(ii) to (v).

(1) Replacement of underground piping systems in contact with the ground must include the installation of secondary containment as defined in section 280.12.

(2) The O/O shall notify the department, in writing, not less than 15 days before any underground piping upgrade or total replacement of an underground piping system, unless the department is notified of, and approves, an emergency replacement.

(d) Spill protection and overfill prevention equipment. To prevent spilling and overfilling associated with product transfer to the UST system, all existing UST systems must comply with UST system spill and overfill prevention equipment requirements specified in subsection 280.20(c).

Notes

Mich. Admin. Code R. 29.2111

1998-2000 AACS; 2008 AACS; 2018 MR 21, Eff. 11/14/2018