Current through September 21, 2024
(a)
Tanks. All tanks regulated by this part, whether existing or
new, shall be welded steel tanks. Bolted or riveted steel tanks or tanks made
of any material other than steel shall not be used as a regulated AST after the
effective date of these regulations. After the effective date of these
regulations, no tank intended for use as an UST shall be installed as an
AST.
(b)
Secondary
Containment. All ASTs regulated under this section shall be
constructed with secondary containment equal to at least 110% of storage
capacity of the largest single AST within the secondary containment wall. The
owner and/or operator of any AST shall control runoff captured inside the
secondary containment system and insure that runoff is free of floating oils
prior to discharge from the secondary containment structure. Secondary
containment shall be constructed of materials that are:
(i) Fireproof;
(ii) Compatible with the regulated substance
stored.
(c)
Vehicle impact protection. All ASTs regulated under this
section shall be protected against vehicle impact by barriers. Barriers are
required on any side subject to impact by a vehicle traveling on any surface
accessible to the public. Barriers shall meet one of the following
specifications:
(i) Guard posts constructed
of steel no less than four (4) inches in diameter and concrete filled, spaced
not more than four (4) feet apart, and set not less than three (3) feet above
ground in a concrete filled footing 15 inches minimum diameter and a minimum of
three feet deep. Posts shall not be located less than five (5) feet from the
tanks.
(ii) Concrete secondary
containment walls if the wall is at least five (5) feet from the tanks, and
extends at least three (3) feet above ground level on the outside of the
structure, and contains a minimum of two 5/8 inch reinforcing rods placed in
the concrete as a continuous band within one foot of the top of the structure.
Secondary containment structures constructed of concrete block, lightweight
steel, or earth do not meet this requirement. Concrete secondary containment
structures which do not meet this requirement may be approved by the department
on a case by case basis.
(iii)
Concrete barriers constructed to DOT specifications for use as a barrier along
highways. These barriers are commonly called "jersey barriers".
(iv) UL-2085 tanks do not require separate
vehicle impact protection, provided that the manufacturer certifies that the
tank provides vehicle impact protection.
(d)
Corrosion protection. All AST
systems regulated under this section shall be protected against corrosion using
one of the following methods:
(i) A
sacrificial anode CP system. Such systems shall be checked annually for proper
operation by a CP tester, and shall be designed by a corrosion expert. Owners
and/or operators of all ASTs protected by sacrificial anode systems shall also
comply with Section 11 of this Chapter;
(ii) An impressed current CP system. Such
systems shall be checked monthly by the owner and/or operator and annually for
proper operation by a CP tester, and shall be designed by a corrosion expert.
Owners and/or operators of all ASTs protected by impressed current systems
shall also comply with Section 11 of this Chapter; or
(iii) Isolation of the AST System from the
ground by placing the tank on a bed of dry and freely draining gravel at least
three (3) inches thick on a concrete floor within a concrete secondary
containment system. Horizontal cylindrical tanks on saddles, and tanks that
meet the requirements of UL 2085 are also isolated from ground
contact.
(e)
Additional requirements for cathodic protection.
(i) Both sacrificial anode and impressed
current CP systems on ASTs shall be designed and installed with test stations
to enable the owners and/or operators to monitor the operation of the CP
system.
(ii) All CP systems
installed on ASTs shall be installed, inspected and maintained to meet or
exceed one or more of the following industry standards and practices:
(A) NACE Standard RP0193-2001, "External
Cathodic Protection of On-Grade Carbon Steel Storage Tank Bottoms";
(B) NACE Standard RP0285-2002, "Control of
External Corrosion on Metallic Buried, Partially Buried, or Submerged Liquid
Storage Systems".; or
(C) API
Recommended Practice 651, "Cathodic Protection of Aboveground Storage
Tanks."
(f)
Overfill protection. All ASTs regulated under this section
shall have overfill protection as follows:
(i) systems shall sound an audible or visible
alarm at the filling rack when the AST is 90% full;
(ii) systems shall close valves and prevent
overfilling the tank before the AST is 95% full; and
(iii) For tanks larger than 100,000 gallons,
the following shall also be provided: a system shall sound a second audible and
visible alarm at the filling rack when the AST is 95% full.
(g)
Spill prevention. All
AST Systems regulated under this section shall have spill prevention equipment
as follows:
(i) all fill lines shall be
protected with a double check valve to prevent backflow from the tank and a
self closing fire valve, activated by a frangible, fusible link;
(ii) the fill lines shall be completely
enclosed within the secondary containment system; or
(iii) each fill line shall have its own
system to control spillage.
(h)
Connected Lines. All underground
pipe lines connected to ASTs regulated under this section shall be
non-corrodible, double walled lines equipped with working leak detection
equipment. All above ground lines shall be steel. All connections between above
ground lines and underground lines shall be made inside accessible leak proof
sumps.
(i)
Applicable
Standards for new ASTs. All new AST systems installed after the date
of these regulations must meet the requirements of one or more of the following
industry standards or practices:
(i) Field
Constructed Steel Tanks.
(A) API Standard
12D, "Specification for Field Welded Tanks for Storage of Production
Liquids";
(B) API Standard 620,
"Design and Construction of Large, Welded Low-Pressure Storage
Tanks";
(C) API Standard 650,
"Welded Steel Tank for Oil Storage";
(D) NFPA Standard 30, "Flammable and
Combustible Liquids Code";
(E) NFPA
Standard 30A, "Motor Vehicle Fueling Stations and Repair Garages
Code";
(F) API Standard 653, "Tank
Inspection, Repair, Alteration, and Reconstruction";
(G) PEI Recommended Practice 200-2003,
"Recommended Practices of Installation of Aboveground Storage Systems for Motor
Vehicle Fueling"; and/or
(H) Other
standards approved by the department.
(ii) Shop Constructed Tanks.
(A) UL 2085, "Protected Aboveground Tanks for
Flammable and Combustible Liquids;
(B) UL 142, "Standard for Aboveground
Flammable and Combustible Liquid Storage Tanks"; or
(C) API Standard 650 Appendix J,
"Shop-Assembled Storage Tanks";
(D)
NFPA Standard 30, "Flammable and Combustible Liquids Code";
(E) ASME, "Boiler & Pressure Vessel Code,
Section VIII, Division 1, Design and Fabrication of Pressure Vessels
(F) API Standard 653, "Tank Inspection,
Repair, Alteration, and Reconstruction";
(G) PEI Recommended Practice 200-2003,
"Recommended Practices of Installation of Aboveground Storage Systems for Motor
Vehicle Fueling";
(j)
ASTs installed after the effective date of
these regulations.
(i) ASTs
installed after the effective date of these regulations shall have a suitable
foundation capable of supporting the tank full of the regulated substance
without excessive differential settlement as defined in API Standard 653 or the
manufacturer's recommendation. The foundation shall be designed by a Registered
Professional Engineer, licensed in the State of Wyoming. The foundation design
shall provide positive drainage of water away from the base. ASTs located in
areas subject to flooding shall be anchored to prevent flotation.
(ii) All ASTs installed or re-installed
after the date of these regulations shall meet all the requirements of Part I
before being placed in service.
(iii) All ASTs installed after the effective date of
these regulations shall be placed on a release prevention barrier. The
integrity of the barrier shall not deteriorate due to exposure to the elements
or soil in the presence of regulated substances. The following are acceptable
release prevention barriers:
(A) An
impermeable geosynthetic clay liner with a permeability of
10-6 cm/sec or less;
(B) An impermeable geosynthetic liner
installed in accordance with manufacturer's recommendations such as a 60 mil
unreinforced liner or a 40 mil reinforced liner, or a material of similar or
more stringent specifications that is compatible with the regulated substance
stored;
(C) A double bottom tank
equipped with a leak detection system that will detect the presence of the
regulated substance in the space between the bottoms; or
(D) For tanks of less than 100,000 gallons
capacity, an impermeable reinforced concrete slab.
(E) For double walled, vaulted tanks with an
interstitial monitoring device, the tank structure meets, by itself, all
requirements for both the secondary containment and the release detection
barrier.
(iv) The owner
and/or operator of every field constructed AST installed after the effective
date of these regulations shall keep on file for the life of the tank, and make
available to the department upon request, the following baseline data:
(A) Floor and wall/shell thickness
measurements;
(B) Material
certifications for all materials used in the construction of the AST system,
including secondary containment and release prevention barriers; and
(C) A report including welding procedures,
welding certification reports, and any non-destructive testing performed on the
AST.
(v) The owner
and/or operator of all shop fabricated ASTs installed after the effective date
of these regulations shall keep on file and make available to the department on
request:
(A) the floor and wall/shell
thickness measurement if a UL label does not exist on the tank; and
(B) material certifications for all materials
used in the construction of the entire AST system.
(vi) All exposed exterior surfaces of all
field constructed ASTs installed after the effective date of these regulations
shall be protected against corrosion. For surfaces that are visible with the
tank in operation, this requirement may be met using field applied coatings
that are compatible with the stored regulated substance.
(vii) The completed installation of all metallic Field
Constructed ASTs installed after the effective date of these regulations shall
be inspected and certified by a certified API 653 inspector.
(viii) The owner and/or operator of any shop
fabricated AST shall keep on file for the life of the AST and provide to the
department on request, a report including welding procedures, welding
certification reports, and any nondestructive testing performed on the
AST.
(ix) The owner and/or
operator of every AST installed after the effective date of these regulations
shall provide a certificate of installation to the department that meets the
requirements of Section 6(e) of this chapter.
(k)
Existing ASTs. Tanks do not need
to be UL labeled but must be designed, constructed, and tested to the approved
standards. Non-UL labeled tanks shall bear an all weather label with the
following information: name and address of the tank manufacturer, year the tank
was built or date of re-certification, capacity of the tank in US gallons, and
the tank construction or inspection standard used. Existing ASTs must meet the
substantial requirements of Section 35 no later than October 1, 200
8.
(l)
Operational
venting. Normal operation vents are required to prevent the
development of vacuum or pressure within ASTs. Such vents shall be sized in
accordance with IFC 3404.2.7.3 and shall be at least the size of the fill or
withdrawal connection but not less than 1 and 1/4 (one and one-quarter) inches
inside diameter. Flammable liquid vents must terminate not less than twelve
(12) feet above grade and five (5) feet from a building opening or property
line. They must discharge upwards and outward. Operational venting shall comply
with API-2000, NFPA 30, UL-142 and UL-2085 as applicable.
(m)
Emergency venting. Each AST shall
be equipped with adequate additional emergency venting that will relieve
excessive internal pressure caused by fire exposure. Emergency venting shall
comply with API-2000, NFPA 30, UL-142 and UL-2085 as applicable.
(n)
Warning signs. Signs,
placarding of product and no smoking signs shall be properly posted in
accordance with IFC 3404.2.3.2, 3404.2.3.2 and 3403.5.
(o)
Upgrading existing tanks. All
existing ASTs that do not meet the requirements of this chapter must be
upgraded no later than October 1, 2008, to meet all of the requirements of this
chapter for new ASTs.
(p)
Fire Marshall plan review. All AST systems installed or
modified after the date of these rules shall provide documentary proof to the
department that the plans have been reviewed and passed by the appropriate
authorizing authority under the State Fire Marshall. This "plan review" insures
compliance with the applicable fire code as adopted into Wyoming State
Statutes.
(q)
Installation
and modification inspections. AST system upgrades required by this
part shall be inspected by the Water Quality Division.
(r)
Access to tank tops. Access shall
be provided to the top of all ASTs for inspection of venting, overfill
equipment and other required equipment. Access shall be by way of permanently
mounted, solidly constructed, non-combustible ladders, stairs, catwalks and
platforms which comply with Occupational Safety and Health Administration
standards.
(s)
Tank
openings. No AST regulated under this section, which is eleven (11)
feet high or less, shall be connected to piping through any opening in a
location other than the top. This means that all fill lines and product
delivery lines must exit the tank through the top. All lines shall be equipped
with anti-syphon devices. ASTs which are higher than eleven (11) feet high, and
have penetrations near the bottom of the tank shall be equipped with internal
fire valves on all openings which are not in the top of the tank.
(t)
Emergency switches.
Emergency disconnect switches shall be provided at prominent locations to stop
the transfer of fuel to the fuel dispenser in the event of a spill or other
emergency. These switches shall be within one-hundred (100) feet but not less
than twenty (20) feet of dispensers. All emergency disconnect switches shall be
labeled: "EMERGENCY FUEL SHUT OFF" using a durable, weatherproof, sign with
letters a minimum of 6" (six inches) high.
(u)
Direct connection between USTs and
ASTs. Any existing UST directly connected to an AST must have an
automatic tank gauging system equipped with an audible and visual alarm system
which will sound when the underground tank is 95% full or automatically shut
off the flow to the UST when the UST is 95% full. This system shall be separate
from any control system which controls the filling of the UST. After the
effective date of these regulations no new connection shall be made between any
UST and any AST.
(v)
Repairs. Repairs to ASTs shall be performed in accordance with
Section 8 of this chapter.
(w)
Submerged ASTs. After the effective date of these regulations,
no AST shall be operated submerged in water.
(x)
Site Security. All ASTs shall be
protected from vandalism and unauthorized product release by security fencing.
Security fences shall be galvanized wire mesh no less than six (6) feet high
topped with three (3) strands of barbed wire on an angled support bracket.
Fencing shall be no less than five (5) feet from any of the tanks within the
secondary containment structure. At facilities where wire fencing is not
allowed by any other authority, the owner/operator may substitute other types
of fencing at least six (6) feet high.
