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UNDERGROUND STORAGE TANK LINING REQUIREMENTS UN-011 - 1/20
http://www.unidocs.org
Rev. 09/10/96
UNDERGROUND STORAGE TANK LINING REQUIREMENTS
For Use by Unidocs Member Agencies or where approved by your Local Jurisdiction.
Authority Cited: 1994 California Fire Code Standards, California Underground Storage Tank Regulations (Title 23,
Division 3, Chapter 16 CCR), State Water Resources Control Board Guidance
All facilities in Santa Clara County which desire to line their underground storage tanks shall meet all
requirements listed in the attached documents:
! California Underground Storage Tank Regulations (Title 23, Division 3, Chapter 16 CCR);
! 1994 California Fire Code Standards for General Safety and Tank Inspection, Preparation, and
Qualification;
! State Water Resources Control Board Local Guidance LG-136 with enclosures: Interior Lining
and Cathodic Protection of Underground Storage Tanks (Question and Answer); and Example
Plan Check for Tank Lining.
Tank lining shall be limited to the following circumstances:
°
Tank lining may be performed only on tanks storing motor vehicle fuel. Tank lining may not be
performed on tanks containing non-motor vehicle fuels (e.g. solvents) or hazardous wastes (e.g.
waste oil);
°
If the tank site is already contaminated, tank lining is only allowed if the contamination can be
mitigated and remediated with the tank in place.
°
Before a tank can be lined, a special inspector (i.e. qualified professional engineer) must certify
in writing that the tank is suitable for lining and continued use. This necessitates opening the
tank and inspecting the inside of it. Underground Storage Tank Lining Requirements - Page 2 of 20
UN-011 - 2/20
http://www.unidocs.org
Rev. 09/10/96
Excerpts from:
California Underground Storage Tank Regulations
(Title 23, Division 3, Chapter 16 CCR)
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 using the interior lining method. The evaluations
described in subsections (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 subsections (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 provided by the
owner to the local agency. The special inspector shall make this certification by entering and
inspecting the entire interior surface of the tank and shall base this certification upon one 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 subdivisions (1)(A) through (C) of this subsection, 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: Underground Storage Tank Lining Requirements - Page 3 of 20
UN-011 - 3/20
http://www.unidocs.org
Rev. 09/10/96
(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 tanks 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 larger than
two and one half inches in diameter.
(iii) Five or more perforations in any one square-foot area.
(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 subsections
(b)(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 subsection (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
coating 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). Underground Storage Tank Lining Requirements - Page 4 of 20
UN-011 - 4/20
http://www.unidocs.org
Rev. 09/10/96
(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 ten years of lining and every five years 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 calendar 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% 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 e