Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0014 - Storage Tanks › Chapter 1 - STORAGE TANKS › Part B - TECHNICAL SPECIFICATIONS › Section 1-6 - Design and Construction Standards for UST Systems

Current through July 13, 2024
In order to prevent releases due to structural failure,
					 corrosion, or spills and overfills for as long as the UST system is used to
					 store regulated substances, all owners and/or operators of UST systems shall
					 meet the requirements in this Section. In addition, all tanks and piping
					 installed or replaced after December 1, 2005, shall be secondarily contained
					 and use interstitial monitoring in accordance with Part D Section 16(f).
					 Secondary containment shall be able to contain regulated substances leaked from
					 the primary containment until they are detected and removed and prevent the
					 release of regulated substances to the environment at any time during the
					 operational life of the tank system. Where the piping is considered to be
					 replaced, the entire piping run shall be secondarily contained.
(a)
Tanks.
Tanks shall be
				  properly designed, constructed, and installed. Underground components that
				  routinely contain regulated substances shall be protected from corrosion in
				  accordance with a code of practice developed by a nationally recognized
				  association or independent testing laboratory as specified below:
(i) Fiberglass-reinforced plastic tanks shall
				  be manufactured and installed in accordance with UL Standard 1316 or UL of
				  Canada S615, both as referenced in Section 2.
(ii) Steel USTs shall be cathodically
				  protected or isolated from ground contact and manufactured and installed to
				  meet the following requirements:
(A) The
				  outside surface of all steel tanks installed after the date of these
				  regulations shall be coated with a suitable dielectric material;
(B) Field-installed CP systems shall be
				  designed by a corrosion expert;
(C)
				  Impressed current CP systems shall be designed to allow determination of
				  current operating status as required in Section 11, including a voltage meter,
				  an amperage meter, and an hour meter showing the hours that the rectifier
				  actually operated; and
(D) CP
				  systems shall be operated and maintained in accordance with Section 11. Once
				  installed, CP systems shall not be removed as long as the steel UST system
				  exists.
(E) In addition to the
				  above requirements, all cathodically protected steel USTs shall be manufactured
				  and installed in accordance with one or more of the following industry
				  standards or practices:
(I) STI-P3®
				  Specification and Manual for External Corrosion Protection of Underground Steel
				  Storage Tanks, as referenced in Section 2; or
(II) UL Standard 1746, as referenced in
				  Section 2; or
(III) UL of Canada
				  S603, S603.1, and S631, all three as referenced in Section 2; or
(IV) NACE Standard SP0285 and UL Standard 58,
				  both as referenced in Section 2; or
(V) STI Standard F841, as referenced in
				  Section 2.
(iii) Tanks constructed of steel and clad or
				  jacketed with a non-corrodible material shall be manufactured and installed in
				  accordance with one or more of the following industry standards or practices:
(A) UL Standard 1746, as referenced in
				  Section 2; or
(B) STI
				  ACT-100-U® Specification F894, as referenced in Section 2; or
(C) STI ACT-100-U® Specification F961, as
				  referenced in Section 2; or
(D) STI
				  Specification F922, as referenced in Section 2.
(iv) Owners and/or operators may continue to
				  operate tanks upgraded with an internal lining as long as CP is in place that
				  meets all requirements of this Chapter.
(v) New steel tanks shall not be installed
				  with a liner without the addition of CP. No existing steel tank with a liner
				  and added CP shall be modified to remove the CP.
(vi) After the effective date of these
				  regulations, no UST may be installed for any purpose regulated under this
				  Chapter with any penetration into the UST except in the top.
(vii) All USTs installed after the effective
				  date of these regulations shall be anchored using deadmen to prevent flotation.
				  No tank shall be installed without providing for the maximum possible buoyancy
				  force assuming that the tank is completely under the local groundwater table.
				  No tank shall be installed using a concrete slab above the tank as the primary
				  method of resisting buoyancy forces.