WAC 173-360-310
Upgrading requirements for existing UST
systems. (1) Alternatives allowed. Not later than December
22, 1998, all existing UST systems shall comply with one of
the following requirements:
(a) New UST system performance standards under WAC 173-360-305;
(b) The upgrading requirements in subsections (2) through
(4) of this section; or
(c) Closure requirements under WAC 173-360-380 through173-360-398
, including applicable requirements for corrective
action under WAC 173-360-399.
(2) Tank upgrading requirements. Steel tanks shall be
upgraded by a certified UST supervisor to meet one of the
following requirements in accordance with a code of practice
developed by a nationally recognized association or
independent testing laboratory:
(a) Interior lining. A tank may be upgraded by internal
lining if:
(i) The lining is installed in accordance with the
requirements of WAC 173-360-325; and
(ii) Within ten years after lining, and every five years
thereafter, the lined tank is internally inspected and found
to be structurally sound with the lining still performing in
accordance with original design specifications, unless
cathodic protection is also installed within ten years of
lining the tank, as specified in WAC 173-360-310 (2)(c).
(b) Cathodic protection. A tank may be upgraded by
cathodic protection if the cathodic protection system meets
the requirements of WAC 173-360-305 (1)(b)(ii), (iii), and
(iv) and the integrity of the tank is ensured using one of the
following methods:
(i) The tank is internally inspected and assessed to
ensure that the tank is structurally sound and free of
corrosion holes prior to installing the cathodic protection
system; or
(ii) The tank has been installed or internally lined for
less than ten years and is monitored monthly for releases in
accordance with WAC 173-360-345 (6)(e) through (j); or
(iii) The tank has been installed or internally lined for
less than ten years and is assessed for corrosion holes by
conducting two tightness tests that meet the requirements of
WAC 173-360-345 (6)(d). The first tightness test shall be
conducted prior to installing the cathodic protection system. The second tightness test shall be conducted between three and
six months following the first operation of the cathodic
protection system; or
(iv) The tank is assessed for corrosion holes by a method
that is determined by the department or delegated agency to
prevent releases in a manner that is no less protective of
human health and the environment than subsection (2)(b)(i)
through (iii) of this section.
(c) Internal lining combined with cathodic protection. A
tank may be upgraded by both internal lining and cathodic
protection if:
(i) The lining is installed in accordance with the
requirements of WAC 173-360-325; and
(ii) The cathodic protection system is installed within
ten years of the tank being lined and meets the requirements
of WAC 173-360-305 (1)(b)(ii), (iii), and (iv).
Note:
The following codes and standards may be used to comply with this section:
(A) American Petroleum Institute Publication 1631,
"Recommended Practice for the Interior Lining of Existing
Steel Underground Storage Tanks";
(B) National Leak Prevention Association Standard 631,
"Spill Prevention, Minimum 10 Year Life Extension of Existing
Steel Underground Tanks by Lining Without the Addition of
Cathodic Protection";
(C) National Association of Corrosion Engineers Standard
RP-02-85, "Control of External Corrosion on Metallic Buried,
Partially Buried, or Submerged Liquid Storage Systems";
(D) American Petroleum Institute Publication 1632,
"Cathodic Protection of Underground Petroleum Storage Tanks
and Piping Systems"; and
(E) Steel Tank Institute Publication STI F894-91
"Specifications for External Corrosion Protection FRP
Composite Underground Steel Storage Tanks."
(3) Piping upgrading requirements. Metal piping that
routinely contains regulated substances and is in contact with
the ground shall be cathodically protected in accordance with
a code of practice developed by a nationally recognized
association or independent testing laboratory and shall meet
the requirements of WAC 173-360-305 (2)(b)(ii), (iii), and
(iv).
Note:
The codes and standards listed in the note following WAC 173-360-305 (2)(b) may be used to comply with this
requirement.
(4) Spill and overfill prevention equipment. To prevent
spilling and overfilling associated with transfer of regulated
substances to the UST system, all existing UST systems shall
comply with new UST system spill and overfill prevention
equipment requirements specified in WAC 173-360-305(3), except
that an UST system that is filled by transfers of no more than
twenty-five gallons at a time is not required to use spill and
overfill prevention equipment.
(5) Certified UST supervisors who perform any of the tank
services described in this section shall certify that such
services comply with the requirements of this section by
signing the appropriate checklist(s) provided by the
department.