Section 2663 - Interior Tank Lining Requirements(a) Tank lining may be used to satisfy part of the upgrade requirements of section 2662 or to repair a tank pursuant to section 2661. However, a tank that has been repaired using the interior lining method may not be repaired a second time with the interior lining method. The evaluations described in subdivisions (b) and (c) of this section shall be completed before the lining of a primary container may be authorized by the local agency. The local agency shall deny the proposed lining if the owner fails to demonstrate that the lined primary container will provide continued containment based on the evaluations described in subdivisions (b) and (c).(b) Appropriate tests shall be conducted by a special inspector who shall certify that the shell will provide structural support if the tank is lined. A copy of this certification shall be submitted by the owner to the local agency through the California Environmental Reporting System or a local reporting portal. The special inspector shall make this certification by entering and inspecting the entire interior surface of the tank and shall base this certification upon of the following sets of procedures and criteria: (1) If a tank is made of non-corrodible material, the following shall be performed: (A) The tank shall be cleaned so that no residue remains on the tank wall surface;(B) The special inspector shall take interior diameter measurements and, if the cross-section of the tank has compressed more than one percent of the original diameter, the tank shall neither be certified nor returned to service unless the tank is excavated and repaired to correct the compression;(C) The special inspector shall conduct an interior inspection to identify any area where compression or tension cracking is occurring and shall determine whether additional fiberglass reinforcing is required for certification before the tank may be lined; and(D) If the special inspector does not certify the tank as suitable for lining because it failed a test conducted in accordance with subparagraphs (A) through (C) of this paragraph, the tank shall be closed in accordance with Article 7.(2) If the tank is constructed of steel or steel clad with a non-corrodible material, the following shall be performed: (A) The tank interior surface shall be abrasive-blasted completely free of scale, rust, and foreign matter; and(B) The entire tank interior shall be tested using a thickness gauge on a one-foot grid pattern with wall thicknesses recorded on a form that identifies the location of each reading. The tank shall be closed in accordance with Article 7 if the tank's average metal thickness is less than 75 percent of the original wall thickness or if the tank has any of the following defects: (i) An open seam or a split longer than three inches;(ii) A perforation larger than one and one half inches in diameter except directly below a gauging opening at the bottom of a tank where the perforation shall be no longer than two and one half inches in diameter;(iii) Five or more perforations in any one square-foot area; or(iv) Multiple perforations of which any single perforation is larger than one half inch in diameter.(3) A test approved by the State Water Board as comparable to the tests specified in paragraphs (1) or (2) above.(c) The owner or operator shall demonstrate to the satisfaction of the local agency, based on the tests conducted in accordance with subdivision (b) above, that a serious corrosion or structural problem does not exist. If the local agency or special inspector determines that a serious corrosion or structural problem exists, interior lining may be performed only if it can be demonstrated to the satisfaction of the local agency that new or additional corrosion protection will significantly minimize the corrosion and that the existing corrosion problem does not threaten the structural integrity or containment ability of the underground storage tank.(d) Before lining a tank, thin areas or other flaws in the tank walls which need additional reinforcing shall be reinforced in accordance with section 2661(d).(e) On and after August 9, 1992, the lining material and lining process shall be listed or certified by an independent testing organization based on voluntary consensus standards.(f) Before being returned to service, any tank which has been lined shall be internally inspected by a coatings expert or special inspector for conformance with the standards under which the tank was lined. This inspection shall be conducted in accordance with section 2663(h) except for subdivisions (h)(3) and (h)(5).(g) Following the lining process and before it is returned to service, the tank shall be given a tank integrity test.(h) If a steel tank is lined for the purpose of satisfying the requirements of section 2662(c), or if any tank is repaired using the interior lining method, it shall be inspected by a coatings expert or special inspector within 120 months of lining and every 60 months thereafter. Written certification of the inspection shall be provided by the tank owner and the party performing the inspection to the local agency within 30 days of completion of the inspection. The inspection shall include all of the following: (1) Determining that the tank has been cleaned so that no residue remains on the tank walls.(2) Determining that the tank has been vacuum tested at a vacuum of 5.3 inches of Hg for no less than one minute. This vacuum test is not required if the tank is constructed of fiberglass and is submerged in groundwater by more than 50 percent of its depth.(3) If the tank is constructed of fiberglass, taking interior diameter measurements to verify whether the cross-section has compressed by more than one percent of the original diameter.(4) Visually checking the tank interior and lining for discontinuity, compression, tension cracking, and corrosion.(5) For steel tanks, testing the entire tank interior using a thickness gauge on a one-foot grid pattern with metal wall thickness recorded on a form that identifies the location of each reading in order to verify that average metal thickness is greater than 75 percent of the original wall thickness.(6) Testing for thickness and hardness of the lining in accordance with nationally recognized industry codes to verify that the lining meets the standards under which the lining was applied.(7) For steel tanks, testing the lining using an electrical resistance holiday detector in accordance with nationally-recognized industry codes. The owner or operator shall have all holidays repaired and checked in accordance with nationally recognized industry codes.(8) Certification from the special inspector or coatings expert that the tank is: (A) Suitable for continued use for a minimum of 60 months;(B) Suitable for continued use for a minimum of 60 months only if it is relined or other improvements are made; or(C) No longer suitable for continued use and shall be closed in accordance with Article 7.(9) A lined tank shall be closed in accordance with Article 7 at the end of its operational life.Cal. Code Regs. Tit. 23, § 2663
1. Repealer and new section filed 4-5-94; operative 5-5-94 (Register 94, No. 14). For prior history, see Register 92, No. 43.
2. Amendment of subsections (a)-(b), (b)(1)(D), (b)(3)-(c), (h) and (h)(8)-(h)(8)(C) and amendment of NOTE filed 10-13-2016; operative 1-1-2017 (Register 2016, No. 42).
3. Redesignation and amendment of subsections (b)(2)(B)1.-4. as subsections (b)(2)(B)(i)-(iv), amendment of subsections (h), (h)(2) and (h)(8)(A)-(B) filed 8-27-2018; operative 10-1-2018 (Register 2018, No. 35). Note: Authority cited: Sections 25299.3 and 25299.7, Health and Safety Code. Reference: Sections 25292, 25292.1, 25296 and 25404, Health and Safety Code; and 40 CFR §§ 280.21 and 280.33.
1. Repealer and new section filed 4-5-94; operative 5-5-94 (Register 94, No. 14). For prior history, see Register 92, No. 43.
2. Amendment of subsections (a)-(b), (b)(1)(D), (b)(3)-(c), (h) and (h)(8)-(h)(8)(C) and amendment of Note filed 10-13-2016; operative 1/1/2017 (Register 2016, No. 42).
3. Redesignation and amendment of subsections (b)(2)(B)1.-4. as subsections (b)(2)(B)(i)-(iv), amendment of subsections (h), (h)(2) and (h)(8)(A)-(B) filed 8-27-2018; operative 10/1/2018 (Register 2018, No. 35).