United States
Environmental Protection
Agency
Requirements For Field-Constructed Tanks
And Airport Hydrant Systems
EPA 510 K 16 002
April 2016
Printed on Recycled Paper
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EPA wrote this booklet for owners and operators of field-constructed tanks (FCTs) and airport
hydrant systems (AHSs).
This booklet describes the 2015 revised federal UST regulation. Many states and territories
(referred to as states in this booklet) have state program approval from EPA. To find a list of states
>rograms.
If your UST systems are located in a state with state program approval, your requirements may be
different from those identified in this booklet. To find information about your state's UST
regulation, contact your implementing agency or visit its website. You can find links to state UST
websites at www.epa.gov/ust/underground-storage-tank-ust-contactsftstates.
If your UST systems are located in a state without state program approval, both the requirements
in this booklet and the state requirements apply to you.
If your UST systems are located in Indian country, the requirements in the booklet apply to you.
Free Publications About UST Requirements
Download or read Requirements For Field-Constructed Tanks And Airport Hydrant Systems on EPA's
underground storage tank (UST) website at www.epa.gov/ust. Order printed copies of many, but
not all, of our documents from the National Service Center for Environmental Publications
(NSCEP), EPA's publication distributor: write to NSCEP, Box 42419, Cincinnati, OH 45242; call
NSCEP's toll-free number 800-490-9198; or fax your order to NSCEP 301-604-3408.
Photographs courtesy of: Florida Department of Environmental Protection
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Contents
What Is This Booklet About? 1
What Must You Do When You Install An FCT or AHS? 13
What Must You Report? 14
What Are Your Spill And Overfill Prevention Requirements? 15
What Are Your Corrosion Protection Requirements? 19
What Are Your Release Detection Requirements? 21
What Must You Do For Walkthrough Inspections? 26
Compatibility With Biofuels And Other Regulated Substances 29
What Are The Operator Training Requirements? 30
How Do You Repair UST Systems? 31
Financial Responsibility 33
What Must You Do About UST Releases? 34
How Do You Close USTs? 36
What Records Must You Keep? 38
Links For More Information[[[ 39
Disclaimer
This document provides information about requirements for field-
constructed tanks and airport hydrant systems. The document is
not a substitute for U.S. Environmental Protection Agency
regulations nor is it a regulation itself — it does not impose legally
binding requirements.
For regulatory requirements regarding UST systems, refer to the
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This booklet discusses requirements for field-constructed
tanks and airport hydrant systems.
As of 2015, the U.S. Environmental Protection Agency
(EPA) regulates over one-half million underground storage
tank systems (USTs) that contain petroleum or hazardous
substances. EPA's Office of Underground Storage Tanks
was formed in response to the discovery in the early 1980s
that thousands of USTs had leaked and contaminated
groundwater supplies in the United States. While the number
of annual releases since that time has gone down
significantly, releases of petroleum from USTs into the
environment are still a significant concern today.
Underground storage tanks form a crucial part of our
country's fueling infrastructure. It is important for USTs to
be constructed, maintained, and operated in a manner such
that petroleum and other regulated substances are stored
safely. EPA developed the UST regulation to help owners
and operators meet these goals.
A properly installed and managed UST system should not
threaten our health or environment. Congress passed federal
laws, which required EPA to develop the UST regulation
described in this book. The federal UST regulation in 40
Code of Federal Regulations (CFR) part 280 requires owners
and operators of USTs to:
• Prevent releases from USTs;
• Detect releases from USTs; and
• Correct the problems created by releases from USTs.
In addition, the regulation requires UST owners and operators
maintain documentation showing they have the ability to pay
for cleaning up a release if their USTs leak.
The 1988 UST regulation deferred UST systems with field-
constructed tanks (sometimes referred to as field-constructed
tanks or FCTs) and airport hydrant fuel distribution systems
(sometimes referred to as airport hydrant systems or AHSs)
from most of the regulation because these systems operated
and were designed differently than conventional USTs.
Releases from USTs can
threaten human health
and the environment,
contaminating both soil
and groundwater. As of
2015, more than 525,000
UST releases have been
confirmed.
About half
of the United States
population uses
groundwater as a source
of drinking water.
Airport hydrant systems
with aboveground storage
tanks (ASTs) directly
connected to underground
hydrant piping are not
regulated under 40 CFR
part 280, unless 10 percent
or more of the total
system capacity, including
underground piping, is
beneath the surface of the
ground.
Owners and operators of
tanks that are not
regulated under 40 CFR
part 280 may have to
follow other requirements
such as those under the
Spill Prevention, Control,
and Countermeasure
(SPCC) regulation.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Sufficient information and technology, in particular, release detection for
piping, were not readily available for these unique systems. The deferral
meant that FCTs and AHSs were not required to meet many of the UST
requirements. Now, EPA has a better understanding of the operation and
design of these systems. As a result, EPA removed the deferral and has
added requirements for FCTs and AHSs under subpart K of 40 CFR part 280.
These changes will help prevent and quickly detect releases from these
systems.
What Is A Field-Constructed Tank? What Is An Airport
Hydrant System?
A field-constructed tank is a tank constructed in the field. For
example, a tank constructed of concrete that is poured in the field, or a
steel or fiberglass tank primarily fabricated in the field is considered
field constructed.
Field-constructed tanks are not built like conventional UST systems at
gas stations. FCTs are typically bulk underground storage tanks that
are built on-site and are not pre-fabricated. FCTs range from
conventional sizes to very large capacities containing millions of
gallons.
An airport hydrant fuel distribution system is an UST system, which
fuels aircraft and operates under high pressure with large diameter
piping that typically terminates into one or more hydrants, also known
as fill stands. The hydrant system begins where fuel enters one or
more tanks from an external source such as a pipeline, barge, rail car,
or other motor fuel carrier.
EPA partially excludes
aboveground tanks
associated with FCTs and
AHSs that meet the
definition of an UST.
Airport hydrant systems often have more than one tank and include:
• aboveground and underground storage tanks storing aircraft
fuel;
• directly connected underground piping; and
• other connected tanks holding aircraft fuel such as settling
tanks or tanks used to relieve pressure in the system.
Airport hydrant systems do not include:
• tanks not storing aircraft fuel, for example, additive tanks;
• tanks not directly connected to the airport hydrant system, for
example, tanks used to power an emergency generator in a
pump house; and
• piping connected to those tanks.
Airport hydrant systems may include field-constructed tanks. Field-
constructed tanks, which are part of an airport hydrant system are
treated as part of the airport hydrant system and not as separate UST
systems.
Remember, partially
excluded aboveground
tanks associated with
FCTs and AHSs are still
required to comply with
subpartsA, F, andH, and
may be subject to other
regulations.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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How Do You Determine Whether Your Airport Hydrant
System Meets EPA's Definition Of A Regulated UST?
Example 1 - Airport Hydrant System That Is Regulated
The system below consists of one 2,000,000 gallon aboveground
storage tank (AST); two 50,000 gallon USTs; underground piping with
150,000 gallons capacity; and one 15,000 gallon UST for relieving
pressure in the line.
The total volume of the system is 2,265,000 gallons. The underground
volume is 265,000 gallons or nearly 11.7 percent of the total system
volume.
Because the underground capacity is greater than 10 percent of the
total system capacity, it meets the definition of an UST and is an
airport hydrant system according to EPA's definition.
Potential AHS
System
'
/
large diameter,
high pressure pipe
i small diameter,
'. \wi
low pressure pipe
Aboveground Underground
(gallons) (gallons)
2,000,000
150,000
(all underground
piping)
4. 50,000
Total Capacity: 2,000,000
15,000
265,000*
(11.7% of
total volume)
"The additive UST, emergency generator UST, and associated piping
are not included in the calculation because they are not part of the
airport hydrant system.
Emergency
Generator UST
Legend
• Aboveground
Tank
-i Underground
-J Tank
Aboveground
Piping
Underground
Piping
Use the examples to
help you calculate
whether your UST
system meets EPA's
definition of an airport
hydrant system.
Remember, when
performing the
calculation, use all
aboveground and
underground tanks
storing aircraft fuel,
including settling
tanks and tanks used
to relieve pressure in
the system, and
underground piping.
Aboveground piping is
not included in the
calculation because
EPA's definition of UST
does not include
aboveground piping.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Example 2 - Airport Hydrant System That Is Not Regulated
The system below consists of one 2,000,000 gallon AST; one 50,000
gallon UST; underground piping with 100,000 gallons capacity; and
one 10,000 gallon UST for relieving pressure in the line.
The total volume of the system is 2,160,000 gallons. The underground
volume is 160,000 gallons or nearly 7.5 percent of the total system
volume.
Because the underground capacity is less than 10 percent of the total
system capacity, it does not meet the definition of an UST and is not
an airport hydrant system according to EPA's definition.
Potential AHS
System
'
/
large diameter,
high pressure pipe
'r •:..'•;•:
I small diameter,
\
low pressure pipe
Aboveground Underground
(gallons)
2,000,000
(gallons)
- 100,000
(all underground
piping)
50,000
Total Capacity: 2,000,000
10,000
160,000*
17.5% of
total volume)
* The additive UST, emergency generator UST, and associated piping
are not included in the calculation because they are not part of the
airport hydrant system.
Emergency
Generator UST
Legend
• Aboveground
Tank
-i Underground
'—' Tank
Aboveground
Piping
Underground
~ Piping
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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What Are The Requirements For Field-Constructed Tanks And
Airport Hydrant Systems?
FCTs And AHSs Installed On Or Before October 13, 2015
The 1988 UST regulation required owners perform corrective action
when releases from FCTs and AHSs occurred. Now, you must meet
release reporting, investigation, confirmation, and closure
requirements.
You must meet these requirements by October 13, 2018:
• One-time notification of existence and financial responsibility;
• Spill, overfill, and corrosion protection;
• Release detection;
• Operator training; and
• General operating requirements, including compatibility,
repairs, and periodic testing and inspections.
Owners and operators of FCTs or AHSs permanently closed before
October 13, 2015 are subject to the closure requirements if a release
from the UST may, in the judgment of the implementing agency, pose
a current or potential threat to human health and the environment.
FCTs And AHSs Installed After October 13, 2015
You must meet these requirements at installation:
• Notification;
• Financial responsibility;
• Spill, overfill, and corrosion protection;
• Release detection;
• General operating requirements, including compatibility and
repairs; and
• Release response, reporting, corrective action, and closure.
You must meet these requirements by October 13, 2018:
• Operator training;
• Walkthrough inspections; and
• Release detection equipment testing.
USTs Associated With FCTs, AHSs, Or Underground Piping
Associated With FCTs Less Than 50,000 Gallons And Installed
Or Replaced After April 11, 2016
You must meet the following in addition to the requirements listed
above for FCTs and AHSs installed after October 13, 2015:
• Secondary containment with interstitial monitoring; and
• Under-dispenser containment for new dispenser systems.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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FCTs And AHSs Installed After October 13, 2018
You must meet all requirements at installation.
The following differences to the UST requirements only apply to FCTs
and AHSs:
• You may use alternative release detection options.
• After April 11, 2016, you may use single-walled piping
when installing or replacing piping for FCTs greater than
50,000 gallons and piping associated with AHSs.
• You must perform periodic walkthroughs of your hydrant
pits and vaults.
Except as provided in § 280.252, owners and operators must
comply with the requirements of subparts A through H and J of 40
CFR part 280.
Hydrant pit
The three tables, which begin on page 7 discuss the UST
requirements and their implementation dates based on when the
UST was installed.
See page 38 for recordkeeping requirements.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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For USTs Installed On Or Before October 13, 2015
For These Tanks Or Facilities:
All Tanks
All Facilities
All Tanks
Tanks And Piping
FCTs With A Capacity Less Than
Or Equal To 50,000 Gallons And
Shop-fabricated Tanks Associated
With AHSs
You Must Have This Equipment Or Perform These Actions:
Installation (page 13)
If you install an LIST system, meet the requirements concerning
correct installation
Under-dispenser containment for new dispensers1 installed after
April 11, 2016
Reporting (page 14)
No later than October 13, 2018, submit a one-time notice of tank
system existence to the implementing agency
Notify your implementing agency at least 30 days before
permanently closing an LIST
Notify your implementing agency within 30 days of acquiring an
LIST
Beginning on October 13, 2018, notify your implementing agency
at least 30 days prior to switching to regulated substances
blended with greater than 10 percent ethanol or greater than 20
percent biodiesel or other regulated substances identified by your
implementinq agency
Spill And Overfill Prevention (page 15)2
No later than October 13, 2018:
Install spill buckets
Install automatic shutoff devices or overfill alarms
Use correct filling practices
Test spill buckets every three years3
Inspect overfill prevention equipment every three years
ion Protection (page 19f
No later than October 13, 2018:
• Meet the same options as for tanks and piping installed after
October 13, 2015; or
Cathodically protected metal and cathodic protection testin;
Release Detection (page 2"
No later than October 13, 2018 meet one of the following:
• Monthly monitoring;5 or
• Manual tank gauging6; or
• Inventory control or manual tank gauging plus tank tightness testing;
EPA allows this method for up to 10 years after tank was installed
FCTs With A Capacity Greater
Than 50,000 Gallons
No later than October 13, 2018 meet any of the release detection methods
for FCTs with a capacity less than or equal to 50,000 gallons, except that
groundwater or vapor monitoring must be used only as indicated in the
alternative options listed here.
Alternatively, one of these options may be used:
• ATG system combined with tank tightness testing, or
• Active vapor monitoring using chemical tracers, or
• Inventory control with biennial tightness testing or passive
groundwater or vapor monitoring, or
• Another method approved by your implementing agency
Pressurized Piping Associated
With FCTs With A Capacity Less
Than Or Equal To 50,000 Gallons
L
No later than October 13, 2018:
• Automatic line leak detector; and either
• Annual line tightness test or
• Monthly monitoring5, except automatic tank gauging
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Pressurized Piping Associated
With AHSs Or Piping Associated
With FCTs Having A Capacity
Greater Than 50,000 Gallons
No later than October 13, 2018 meet any of the release detection methods
for FCTs with a capacity less than or equal to 50,000 gallons, except that
groundwater or vapor monitoring must be used only as indicated in the
alternative options listed here.
Alternatively, one of these options may be used:
• Semiannual or annual line tightness testing, or
• Active vapor monitoring using chemical tracers, or
• Inventory control with biennial tightness testing or groundwater or
passive vapor monitoring, or
• Another method approved by your implementing agency
Release Detection Testing
No later than October 13, 2018, annually test release detection
operability
No later than October 13, 20183, every three years test
containment sumps used for piping interstitial monitoring
Facilities Using Vapor Or
Groundwater Monitoring
^mm
All Facilities
FCTs And AHSs
All Facilities
All Tanks
All Facilities
All Facilities
All Facilities
No later than October 13, 2018, begin keeping a record of a site
assessment for as lonq as the method is used
Walkthrough Inspections (page 26)
Beginning on October 13, 2018, conduct 30 day and annual
walkthrouqh inspections
Compatibility (page 29)
No later than October 13, 2018:
• Use UST systems made of or lined with material compatible with
the substance stored; and
• For systems storing certain regulated substances, maintain
records demonstrating compliance with the compatibility
requirement
Operator Training (page 30)
No later than October 13, 2018, have designated and trained
Class A, B, and C operators
Repairs (page 31)
Test following repairs to your tank and piping within 30 days
Test following repairs to your cathodic protection system within six
months
Test or inspect components within 30 days after a repair to spill or
overfill prevention equipment or secondary containment areas
Financial Responsibility (page 33)7
Keep records demonstrating you have the financial resources to
clean up a site if a release occurs, correct environmental damage,
and compensate third parties for injury to their property or
themselves
Release Response (page 34)
Take corrective action in response to releases
Closure (page 36)
Temporarily or permanently close your UST system properly
Notes:
1 Dispenser does not mean containment for a hydrant fueling pit or pantograph; it is mobile rigid aboveground piping
that connects a fuel source or fuel pit to an aircraft.
2 Spill buckets are not required for UST systems that never receive deliveries greater than 25 gallons or USTs filled by
a directly connected pipeline.
3 Spill containment and containment sump testing is not required if the containment is double-walled and uses periodic
interstitial monitoring.
4 FCTs and AHSs installed after December 22, 1988 were required to have corrosion protection at the time of
installation to meet the interim prohibition requirement in the 1988 UST regulation.
5 Monthly monitoring, which does not exceed 30 days, includes: interstitial monitoring; automatic tank gauging; vapor
monitoring, groundwater monitoring; statistical inventory reconciliation; continuous in-tank leak detection; and other
methods approved by your implementing agency.
6 Tanks 2,000 gallons and smaller may be able to use manual tank gauging.
7 State and federal governments are exempt from the financial responsibility requirements.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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For USTs Installed Between October 13, 2015 And April 11, 2016
For These Tanks Or Facilities:
All Tanks
All Facilities
You Must Have This Equipment Or Perform These Actions:
Installation (page 13)
If you install an LIST system, meet the requirements concerning
correct installation.
Under-dispenser containment for new dispensers1 installed after
April 11, 2016.
Reporting (page 14)
After you bring an LIST system into use, notify your implementing
agency within 30 days
Notify your implementing agency at least 30 days before
permanently closing an LIST
Notify your implementing agency within 30 days of acquiring an
LIST
Beginning on October 13, 2018, notify your implementing agency
at least 30 days prior to switching to regulated substances
blended with greater than 10 percent ethanol or greater than 20
percent biodiesel or other regulated substances identified by your
implementinq agency
Overfill Prevention (page 15)2
All Tanks
Tanks And Piping
FCTs With A Capacity Less Than
Or Equal To 50,000 Gallons And
Shop-fabricated Tanks Associated
With AHSs
Spill buckets
Automatic shutoff devices or overfill alarms
Use correct filling practices
Test spill buckets every three years3
Inspect overfill prevention equipment every three years
Corrosion Protection (page 19)4
Coated and cathodically protected steel and cathodic protection
testing; or
Noncorrodible material, such as fiberglass reinforced plastic or
flexible plastic for piping only; or
Steel tank clad or iacketed with noncorrodible material for tanks onlv
Release Detection (page 21)
Monthly monitoring;5 or
Manual tank gauging;6 or
Inventory control or manual tank gauging plus tank tightness testing;
EPA allows this method for up to 10 years after tank was installed
FCTs With A Capacity Greater
Than 50,000 Gallons
Meet any of the release detection methods for FCTs with a capacity less
than or equal to 50,000 gallons, except that groundwater or vapor
monitoring must be used only as indicated in the alternative options listed
here.
Alternatively, one of these options may be used:
• ATG system combined with tank tightness testing, or
• Active vapor monitoring using chemical tracers, or
• Inventory control with biennial tightness testing or passive
groundwater or vapor monitoring, or
• Another method approved by your implementing agency
Pressurized Piping Associated
With FCTs With A Capacity Less
Than Or Equal To 50,000 Gallons
Automatic line leak detector; and either
Annual line tightness test; or
Monthly monitoring5, except automatic tank gauging)
Pressurized Piping Associated
With AHSs Or Piping Associated
With FCTs Having A Capacity
Greater Than 50,000 Gallons
Meet any of the release detection methods for FCTs with a capacity less
than or equal to 50,000 gallons, except that groundwater or vapor
monitoring must be used only as indicated in the alternative options listed
here.
Alternatively, one of these options may be used:
• Semiannual or annual line tightness testing; or
• Active vapor monitoring using chemical tracers; or
• Inventory control with biennial tightness testing or groundwater or
passive vapor monitoring; or
• Another method approved by your implementing agency
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Release Detection Testing
No later than October 13, 2018, annually test release detection
operability
No later than October 13, 20183, every three years test
containment sumps used for piping interstitial monitoring
Facilities Using Vapor Or
Groundwater Monitoring
All Facilities
FCT And AHSs
All Facilities
All Tanks
All Facilities
All Facilities
All Facilities
No later than October 13, 2018, begin keeping a record of a site
assessment for as long as the method is used
Walkthrough Inspections (page 26)
Beginning on October 13, 2018, conduct 30 day and annual
walkthrough inspections
Compatibility (page 29)
No later than October 13, 2018:
• Use UST systems made of or lined with material compatible with
the substance stored; and
• For systems storing certain regulated substances, maintain
records demonstrating compliance with the compatibility
requirement
Operator Training (page 30)
No later than October 13, 2018, have designated and trained
Class A, B, and C operators
Repairs (page 31)
Test following repairs to your tank and piping within 30 days
Test following repairs to your cathodic protection system within six
months
Test or inspect components within 30 days after a repair to spill or
overfill prevention equipment or secondary containment areas
Financial Responsibility (page 33)7
Keep records demonstrating you have the financial resources to
clean up a site if a release occurs, correct environmental damage,
and compensate third parties for injury to their property or
themselves
Release Response (page 34)
Take corrective action in response to releases
Closure (page 36)
Temporarily or permanently close your UST system properly
Notes:
1 Dispenser does not mean containment for a hydrant fueling pit or pantograph; it is mobile rigid aboveground piping
that connects a fuel source or fuel pit to an aircraft.
2 Spill buckets are not required for UST systems that never receive deliveries greater than 25 gallons or USTs filled by
a directly connected pipeline.
3 Spill containment and containment sump testing is not required if the containment is double-walled and uses periodic
interstitial monitoring.
4 FCTs and AHSs installed after December 22, 1988 were required to have corrosion protection at the time of
installation to meet the interim prohibition requirement in the 1988 UST regulation.
5 Monthly monitoring, which does not exceed 30 days, includes: interstitial monitoring; automatic tank gauging; vapor
monitoring, groundwater monitoring; statistical inventory reconciliation; continuous in-tank leak detection; and other
methods approved by your implementing agency.
6 Tanks 2,000 gallons and smaller may be able to use manual tank gauging.
7 State and federal governments are exempt from the financial responsibility requirements.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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For USTs Installed After April 11, 2016
For These Tanks Or Facilities:
^M
All Tanks
^m
All Facilities
All Tanks
You Must Have This Equipment Or Perform These Actions:
Installation (page 13)
If you install an LIST system, meet the requirements concerning
correct installation.
Under-dispenser containment for new dispensers1.
Reporting (page 14)
After you bring an LIST system into use, notify your implementing
agency within 30 days
Notify your implementing agency at least 30 days before
permanently closing an LIST
Notify your implementing agency within 30 days of acquiring an
LIST
Beginning on October 13, 2018, notify your implementing agency
at least 30 days prior to switching to regulated substances
blended with greater than 10 percent ethanol or greater than 20
percent biodiesel or other regulated substances identified by your
implementinq agency
Spill And Overfill Prevention (page 15)2
Spill buckets
Automatic shutoff devices or overfill alarms
Use correct filling practices
Test spill buckets every three years3
Inspect overfill prevention equipment every three years
Corrosion Protect!
Tanks And Piping
FCTs, Pressurized Piping
Associated With FCTs Having A
Capacity Less Than Or Equal To
50,000 Gallons, And AHSs
Coated and cathodically protected steel and cathodic protection
testing; or
Noncorrodible material, such as fiberglass reinforced plastic or
flexible plastic for piping only; or
Steel tank clad or iacketed with noncorrodible material for tanks only
Release Detection (page 21)
Secondary containment with interstitial monitoring
Pressurized piping must also have an automatic line leak detector
Pressurized Piping Associated
With AHSs Or Piping Associated
With FCTs Having A Capacity
Greater Than 50,000 Gallons
Meet any of the release detection methods for FCTs with a capacity less
than or equal to 50,000 gallons, except that groundwater or vapor
monitoring must be used only as indicated in the alternative options listed
here.
Alternatively, one of these options may be used:
• Semiannual or annual line tightness testing; or
• Active vapor monitoring using chemical tracers; or
• Inventory control with biennial tightness testing or groundwater or
passive vapor monitoring; or
• Another method approved by your implementing agency
Release Detection Testing
No later than October 13, 2018, annually test release detection
operability
No later than October 13, 20183, every three years test
containment sumps used for piping interstitial monitoring
Facilities Using Vapor Or
Groundwater Monitoring
^M
All Facilities
No later than October 13, 2018, begin keeping a record of a site
assessment for as long as the method is used
Walkthrough Inspections (page 26)
• Beginning on October 13, 2018, conduct 30 day and annual
walkthrough inspections
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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FCT And AHSs
All Facilities
All Tanks
Compatibility (page 29)
No later than October 13, 2018:
• Use LIST systems made of or lined with material compatible with
the substance stored
• For systems storing certain regulated substances, maintain
records demonstrating compliance with the compatibility
requirement
Operator Training (page 30)
No later than October 13, 2018, have designated and trained
; operators
All Facilities
^mm
All Facilities
^H
All Facilities
Repairs (page 31)
Test following repairs to your tank and piping within 30 days
Test following repairs to your cathodic protection system within six
months
Test or inspect components within 30 days after a repair to spill or
overfill prevention equipment or secondary containment areas
Financial Responsibility (page 33)5
• Keep records demonstrating you have the financial resources to
clean up a site if a release occurs, correct environmental damage,
and compensate third parties for injury to their property or
themselves
Release Response (page 34)
• Take corrective action in response to releases
E3n^33^M^^^^^H
Temporarily or permanently close your LIST system properly
Notes:
1 Dispenser does not mean containment for a hydrant fueling pit or pantograph; it is mobile rigid aboveground piping
that connects a fuel source or fuel pit to an aircraft.
2 Spill buckets are not required for LIST systems that never receive deliveries greater than 25 gallons or USTs filled by
a directly connected pipeline.
3 Spill containment and containment sump testing is not required if the containment is double-walled and uses periodic
interstitial monitoring.
4 FCTs and AHSs installed after December 22, 1988 were required to have corrosion protection at the time of
installation to meet the interim prohibition requirement in the 1988 LIST regulation.
5 State and federal governments are exempt from the financial responsibility requirements.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
-------
Make sure your UST system is installed correctly; use
qualified installers who follow industry codes and
manufacturers' instructions. See
www. epa. gov/ust/underground-storage-tanks-usts-laws-
regulations#code for more information on industry codes and
installation practices.
• Make sure your installer completes and signs the
certification for proper installation on the notification
form available at www.epa.gov/ust/notification-
form s-underground-storage-tanks.
Installation problems may result from installation practices,
which do not follow standard industry codes and procedures.
Improper installation could result in UST system failures.
Installation includes activities such as excavation, UST
system siting, burial depth, tank system assembly, backfilling
around the UST system, and surface grading.
Make sure installers carefully follow the correct installation
procedures called for by manufacturers' instructions and
industry codes.
If you use dispensers with your FCTs or AHSs, dispensers
installed after April 11, 2016 must have under-dispenser
containment. Under-dispenser containment must be liquid-
tight on its sides, bottom, and at penetrations. Under-
dispenser containment must allow for visual inspection and
access to the components in the containment system or be
periodically monitored for leaks from the dispenser system.
Installation of AHS pip
and vaults
If you modify your system
by adding aboveground
tanks or removing USTs or
underground piping, your
regulatory status may
change. Always perform
the 10 percent calculation
to determine if your
system must follow the
UST regulation; see page 3
for the calculation.
Check with your
implementing agency to
see whether there are
additional notification
requirements you must
follow.
Make sure installers
carefully follow the correct
installation procedures
called for by
manufacturers'
instructions and industry
codes.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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You must report to your implementing agency on the following occasions:
When This Happens: You Must Report This: By This Time:
For systems installed on or before
October 13, 2015
After you install an LIST
After you acquire an LIST
Before switching to certain biofuels
or other substances identified by
your implementing agency
When you suspect a release
When you confirm a release
Before you permanently close your
LIST
You must submit a one-time
notice of tank system existence
to your implementing agency.
You must complete and submit a
notification form available from
your implementing agency. This
form requests information about
your LIST, including a certification
of correct installation.
You must complete a notification
of ownership change form
available from your implementing
agency.
You must notify your
implementing agency.
You must report suspected
releases to your implementing
agency.
You must report follow-up
actions you plan or have taken
to correct the damage caused by
your LIST.
You must notify your
implementing agency.
October 13, 2018
Within 30 days of bringing the
LIST into use
Within 30 days after you
acquire an LIST
At least 30 days before
switching to certain biofuels
or other substances identified
by your implementing agency
Within 24 hours (or another
period specified by your
implementing agency)
Within 20 days (or another
period specified by your
implementing agency)
At least 30 days before you
permanently close your LIST
Check with your implementing agency for additional requirements not noted above.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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What Are Your Spill And
Overfill Prevention
Requirements?
What Must You Do For Spill Prevention?
• No later than October 13, 2018, field-constructed
tanks and airport hydrant system tanks must have
spill prevention equipment if a delivery hose is used
to fill the UST. Spill prevention equipment, which
is commonly called spill buckets or catchment
basins, is used to contain drips and small spills that
can occur when the delivery hose is disconnected
from the fill pipe.
• You must test your spill prevention equipment at
least every three years for liquid tightness or use a
double-walled spill bucket with periodic interstitial
monitoring. The test must be conducted according
to a code of practice or manufacturer's instructions
or requirements determined appropriate by your
implementing agency.
• No later than October 13, 2018, you must begin
inspecting your spill prevention equipment at least
every 30 days or before each delivery if you receive
deliveries less frequently than every 30 days. See
page 26 for more information about what you must
check during your walkthrough inspections.
• You and your fuel deliverer must follow correct
filling practices.
Many releases at UST sites come from spills. Spills often
occur at the fill pipe when the delivery vehicle's hose is
disconnected. Although these spills are usually small,
repeated small releases can cause big environmental
problems.
What Are Spill Buckets?
Spill buckets are also called spill containment manholes or
catchment basins. Basically, a spill bucket is a contained
area around the fill pipe.
To protect against spills, the spill bucket should be large
enough to contain what may spill when the delivery hose is
uncoupled from the fill pipe. Spill buckets range in size
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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from those capable of holding only a few gallons to those that are
much larger - the larger the spill bucket, the more spill protection it
provides.
You should try to keep water out of spill buckets. Some spill buckets
can collect water and sediment, along with spilled product, making
draining this mixture into the tank unwise. If this happens, you may
pump out the spill bucket and dispose of the liquid properly. If the
liquid contains fuel or chemicals, it could be considered a hazardous
waste. Contact your implementing agency responsible for hazardous
waste for information on testing and handling requirements.
What Must You Do For Overfill Prevention?
• No later than October 13, 2018, field-constructed tanks and
airport hydrant system tanks must have overfill prevention.
Tanks installed after October 13, 2015 must have overfill
prevention when they are installed. Automatic shutoff devices
and overfill alarms are two types of overfill prevention
devices, which are described below.
• You must inspect your overfill prevention equipment at least
once every three years to ensure it will function properly to
prevent overfills. The inspection must be conducted
according to a code of practice or manufacturer's instructions,
or requirements determined appropriate by your implementing
agency.
• You and your delivery person must follow correct filling
practices.
Overfills usually release much larger volumes than spills. When a
tank is overfilled, large volumes can be released at the fill pipe and at
other areas of the UST system, such as loose fittings on the top of the
tank, vapor recovery ports, a loose vent pipe, or other tank top
openings.
You can solve overfill problems by:
• Making sure there is enough room in the tank for the delivery
before the delivery is made;
• Watching the entire delivery to prevent overfilling or spilling;
and
• Using overfill prevention devices.
Note: If you receive pumped deliveries, which means fuel is
delivered under pressure, you must make sure your overfill
prevention device works properly with pumped deliveries. Also,
remember that overfill prevention devices are effective only when
combined with careful filling practices.
Overflll prevention is
required for all FCTs
andAHSs, even if they
are not filled by a
delivery hose.
Overfill prevention is
not required for
temporarily closed
tanks.
To work properly, all
overfill devices must be
installed correctly at the
proper distance below
the tank top as specified
by the manufacturer.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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What Are Automatic Shutoff Devices?
An automatic shutoff device installed in an UST's fill pipe slows
down and then stops delivery when the product reaches 95 percent
capacity or before the fittings on top of the tank are exposed to
product. This device - sometimes called a flapper valve - has one or
two valves that are operated by a float mechanism.
Some automatic shutoff devices work in two stages. The first stage
drastically reduces the flow of product to alert the delivery person
that the tank is nearly full. The delivery person can then close the
delivery valve and still have room in the tank for the product left in
the delivery hose.
If the delivery person does not pay attention and the liquid level rises
higher, the valve closes completely and no more liquid can be
delivered into the tank, leaving the driver with a delivery hose full of
product. Pipeline deliveries, where no delivery hose is connected or
disconnected, should not experience this problem.
What Are Overfill Alarms?
Overfill alarms use probes installed in the tank to activate an alarm
when the tank is either 90 percent full or within 1 minute of being
overfilled. Either way, the alarm should provide enough time for the
delivery person to close the shutoff valve before an overfill happens.
Alarms must be located where the delivery person can see or hear
them easily. Overfill alarms are often part of automatic tank gauging
systems.
Overfill alarms work only if they alert the delivery person at the right
time and the delivery person responds quickly. Remember to put the
alarm on an electrical circuit that is active all the time so that the
alarm will always work.
What Are Your Responsibilities For Correct Filling
Practices?
I
Inventory
Overfill alarm
Human error causes most spills. You can avoid mistakes by
following correct tank filling practices. For example, you must make
sure there is room in the UST for the delivery, and the delivery person
must watch the delivery at all times. For this reason, the UST
regulation requires that you follow correct filling practices.
As an owner or operator, you are responsible for ensuring that
releases due to spilling or overfilling do not occur during fuel
delivery. As part of this responsibility, you must:
If you and your delivery
person follow correct filling
practices, nearly all spills
and overfills can be
prevented.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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• Ensure the amount of product to be delivered will fit into the
available empty space in the tank; and
• Ensure the transfer operation is monitored constantly to prevent
overfilling and spilling.
What To Do Before Your USTs Are Filled
• Post clear signs that alert the fuel delivery person to the overfill devices
and alarms in use at your facility.
• Make and record accurate readings for product and water in the tank
before fuel delivery.
• Order only the quantity of fuel that will fit into 90 percent of the tank.
• The formula for determining the maximum amount of fuel to order is:
(Tank capacity in gallons x 90%) - Fuel currently in tank = Maximum
amount of fuel to order
o Example: (10,000 gal. x 0.9) - 2,000 gal. = 7,000 gal.
maximum amount to order
• Ensure the fuel delivery person knows the type of overfill device present
at the tank and what actions to perform if it activates.
• Review and understand the spill response procedures.
• Verify that your spill bucket is empty, clean, and will contain spills.
What To Do While Your USTs Are Being Filled
• Keep fill ports locked until the fuel delivery person requests access.
• Keep an accurate tank capacity chart available for the fuel delivery
person.
• The fuel delivery person makes all hook-ups.
• The person responsible for monitoring the delivery should remain
attentive and observe the entire fuel delivery; be prepared to stop the flow
of fuel from the truck to the UST at any time; and respond to any unusual
condition, leak, or spill that may occur during delivery.
• Keep response supplies readily available for use in case a spill or overfill
occurs.
• Provide safety barriers around the fueling zone.
• Make sure there is adequate lighting around the fueling zone.
What To Do After Your USTs Are Filled
• Following complete delivery, the fuel delivery person is responsible for
disconnecting all hook-ups.
• Return spill response kit and safety barriers to proper storage locations.
• Make and record accurate readings for product and water in the tank after
fuel delivery.
• Verify the amount of fuel received.
• Make sure fill ports are properly secured.
• Ensure the spill bucket is free of product and clean up any
small spills.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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The federal UST regulation requires corrosion
protection to help prevent your USTs from
releasing product into the environment.
Tanks and piping entirely made of non-
corrodible material, such as fiberglass or
concrete, do not need cathodic protection.
What Are Cathodic Protection
Methods?
Sacrificial Anode System: Sacrificial anodes
are buried and attached to UST components for
corrosion protection. Anodes are pieces of
metal that are more electrically active than
steel, and thus they suffer the destructive effects
of corrosion rather than the steel they are
attached to.
Impressed Current System: An impressed
current system uses a rectifier to provide direct
current through anodes to the tank or piping to
achieve corrosion protection. The steel is
protected because the current going to the steel
overcomes the corrosion-causing current
flowing away from it. The cathodic protection
rectifier must always be on and operating to
protect your UST system from corrosion.
You must have a qualified cathodic protection
tester test your cathodic protection system at
least every three years to make sure the
cathodic protection system is protecting the
UST system. If you have an impressed current
system, you must inspect it every 60 days to
make sure the impressed current rectifier is
running properly.
Never turn off your rectifier. If your rectifier is
off, your UST system is not being protected
from corrosion.
Corrosion results when bare metal and
soil and moisture conditions combine to
produce an underground electric current
that destroys hard metal. Over time,
unprotected USTs can corrode and leak.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Corrosion Protection For Steel USTs
No later than October 13, 2018, steel USTs installed on or before
October 13, 2015 must have cathodic protection. If the tank is greater
than 10 years old, it must be assessed to make sure the tank is
structurally sound and free of corrosion holes before adding cathodic
protection. The assessment must be by internal inspection or another
method determined by your implementing agency to adequately
assess the tank for structural soundness and corrosion holes.
A qualified cathodic protection tester must test your cathodic
protection systems within six months of installation and at least every
three years thereafter. You must keep the results of the last two tests
to prove that the cathodic protection is working. In addition, if you
have an impressed current cathodic protection system, you must
inspect it at least once every 60 days to verify that the system is
operating. Keep results of your last three inspections to prove that the
impressed current system is operating properly.
Corrosion Protection For Metal Piping
Not later than October 13, 2018, metal piping installed on or before
October 13, 2015, must have cathodic protection. In addition, owners
and operators must test, inspect, and keep records as described above
for tank cathodic protection.
Corrosion Protection For Steel Tanks And Piping
Your tanks and piping must meet one of the following to be protected
from corrosion:
• Tank and piping are completely made of a noncorrodible
material, such as fiberglass.
» Tank is made of steel and completely isolated from contact
with the surrounding soil by being enclosed or jacketed in
noncorrodible material, such as concrete.
• Tank and piping are made of steel having a corrosion-resistant
coating and having cathodic protection. A corrosion-resistant
coating electrically isolates the coated metal from the
surrounding environment to help protect against corrosion.
An asphaltic coating does not qualify as a corrosion-resistant
coating. Galvanized steel does not meet the corrosion
protection requirements. You must have cathodic protection
systems tested and inspected and keep records, as explained
above.
Note that field-
installed cathodic
protection must be
designed by a
qualified corrosion
expert.
Metal tanks and
piping encased or
surrounded by
concrete have no
metal in contact with
the ground and do not
have to be
cathodically
protected.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Owners and operators may use the conventional release
detection options described in 40 CFR 280 subpart D and
outlined below or alternative release detection options for
FCTs and AHSs as described below.
When Do You Have To Meet Release Detection
Requirements?
FCTs and AHSs installed on or before October 13, 2015
must have release detection no later than October 13, 2018.
FCTs and AHSs installed after October 13, 2015 must meet
all release detection requirements at installation.
Tanks and some piping installed after April 11, 2016 must
be secondarily contained and use interstitial monitoring at
installation. Owners and operators may use single walled
piping when installing or replacing piping associated with
UST systems with field-constructed tanks greater than
50,000 gallons and piping associated with airport hydrant
systems.
No later than October 13, 2018, you must conduct your first
annual release detection equipment test to make sure
components such as probes, sensors, and automatic line leak
detectors are working properly. You must keep records of
these tests for three years.
No later than October 13, 2018, you must begin conducting
walkthrough inspections that check your release detection
equipment every 30 days. In addition, you must check your
hand-held release detection equipment annually. You must
keep records of the walkthrough inspection for one year.
See pages 26-28 for more information about what you must
do on your walkthrough inspections.
What Are The Piping Release Detection
Requirements?
For underground piping associated with FCTs less than or
The conventional release
detection options are also
covered in detail in Straight
Talk On Tanks, which you
can find at
talk-tanks-leak-detection-
methods-Detroleum-
undereround-storaee-tanks-
Aboveground FCTs and
aboveground tanks
associated with AHSs are
partially excluded from the
UST regulation. These
aboveground tanks do not
have to meet the UST
release detection
requirements.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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equal to 50,000 gallons installed on or before April 11, 2016, you
must use these conventional release detection options:
• Underground pressurized piping must have an automatic line
leak detector (ALLD) that:
o Shuts off flow; or
o Restricts flow; or
o Triggers an audible or visual alarm.
The ALLD must be designed to detect a release at least 3 gallons per
hour at a line pressure of 10 pounds per square inch within one hour,
with a probability of detection of at least 95 percent and a probability
of false alarm of no more than 5 percent.
• You must also use one other method:
o Annual line tightness test
o Monthly interstitial monitoring
o Monthly vapor monitoring
o Monthly groundwater monitoring
o Monthly statistical inventory reconciliation
o Continuous in-tank leak detection only for methods
that include pipelines
o Other monthly monitoring that meets performance
standards or approved by implementing agency
EPA divided vapor monitoring into two categories: active monitoring
which involves monitoring for chemical markers or tracers and
passive monitoring which involves monitoring for stored product in
the tank system.
Underground piping associated with FCTs less than or equal to
50,000 gallons installed after April 11, 2016 must be secondarily
contained and use interstitial monitoring. In addition, this piping
must use an ALLD.
For underground piping associated with all AHSs and those FCTs
greater than 50,000 gallons, you must meet the release detection
requirements by using either the conventional piping release detection
options described above, except groundwater and passive vapor
monitoring must be combined with inventory control, or one of these
four alternatives:
• Line tightness testing at varying leak rates based on line
segment volume
The term monthly used
as it applies to release
detection monitoring
frequency means release
detection monitoring
must occur at least once
every 30 days.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Maximum Leak Detection Rate Per Test Section Volume
Test Section
Volume
(Gallons)
< 50,000
> 50,000 to <
75,000
> 75,000 to <
100,000
> 100,000
Semiannual Test -
Leak Detection
Rate Not To
Exceed (Gallons
Per Hour)
1.0
1.5
2.0
3.0
Annual Test -
Leak Detection
Rate Not To
Exceed (Gallons
Per Hour)
0.5
0.75
1.0
1.5
o Perform a semiannual or annual line tightness test at or
above operating pressure according table below.
o Piping segment volumes greater than or equal to
100,000 gallons not capable of meeting the 3 gallons
per hour leak rate for semiannual testing may be tested
at a leak rate up to 6 gallons per hour according to the
table below.
Phase In For Piping Segments > 100,000 Gallons In Volume
First test
Second test
Third test
Subsequent
tests
No later than October 13, 2018 (may use up to
6 gallons per hour leak rate)
Between October 13, 2018 and October 13,
2021 (may use up to 6 gallons per hour leak
rate)
Between October 13, 2021 and October 13,
2022 (must use 3 gallons per hour leak rate)
After October 13, 2022, begin using
semiannual or annual line testing according to
the Maximum Leak Detection Rate Per Test
Section Volume table above
• Active vapor monitoring using chemical markers or tracers
o At least every two years, perform active vapor
monitoring for a chemical tracer compound placed in
the tank system. The monitoring must be capable of
detecting a 0.1 gallon per hour leak rate.
• Inventory control with biennial tightness testing, or
groundwater or passive vapor monitoring with monitoring of
the stored regulated substance.
o At least every 30 days, perform inventory control
according to Department of Defense (DoD) Directive
4140.25
www.dtic.mil/whs/directives/corres/pdf/414025p.pdf
Air Transport Association (ATA) Airport Fuel Facility
Operations and Maintenance Guidance Manual
The terms semiannual
and annual used as they
apply to release
detection monitoring
frequency mean release
detection monitoring
must occur at least once
every 180 days and 365
days, respectively.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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https://publicati ons.airlines.org/ComtnerceProductDeta
il.aspx?Product=40, or equivalent procedures that can
detect a leak less than or equal to 0.5 percent of system
flow through and either:
• At least every two years, perform a line tightness
test using the release detection rate for the
semiannual test in the Maximum Release
Detection Rate Per Test Section Volume table
above, or
• At least every 30 days, perform vapor monitoring
or groundwater monitoring for the stored
regulated substance.
Another method approved by your implementing agency
o Your implementing agency may approve another method
of release detection for these types of piping if you can
demonstrate that the method can detect a release as
effectively as any of the methods listed above. In
comparing methods, your implementing agency must
consider the size of release the method can detect and the
frequency and reliability of detection.
What Are The Tank Release Detection Requirements?
Shop-fabricated USTs associated with AHSs and FCTs with a
capacity less than or equal to 50,000 gallons installed on or before
April 11, 2016 must be monitored using any of the following
conventional tank release detection options in 40 CFR subpart D.
• Secondary containment with interstitial monitoring
• Automatic tank gauging (ATG) systems with static testing
• Continuous in-tank leak detection
• Statistical inventory reconciliation
• Inventory control and tank tightness testing
• Manual tank gauging
• Groundwater monitoring
• Vapor monitoring
• Other methods meeting performance standards or approved by
your implementing agency
FCTs with a capacity greater than 50,000 gallons installed on or before
April 11, 2016 must be monitored either using any of the conventional
tank release detection methods listed above, except groundwater and
passive vapor monitoring must be combined with inventory control as
stated below or use one of the alternatives listed below.
• Tank tightness testing
o Conduct an annual tank tightness test that can detect a
Most shop-fabricated
USTs are less than or
slightly greater than
50,000 gallons. All shop
fabricated tanks
associated with AHSs
must meet conventional
tank release detection
requirements.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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0.5 gallon per hour leak rate.
• ATG systems with tank tightness testing
o At least once every 30 days, use an ATG system to perform release
detection, which can detect a leak rate of 1 gallon per hour or less;
and at least once every three years, use a tank tightness test that can
detect a 0.2 gallon per hour leak rate; or
o At least once every 30 days, use an ATG system to perform release
detection, which can detect a leak rate of 2 gallons per hour or less;
and at least every two years, use a tank tightness test that can detect a
0.2 gallon per hour leak rate.
• Active vapor monitoring using chemical tracers
o At least every two years, perform vapor monitoring for a tracer
compound in the tank system capable of detecting a 0.1 gallon per
hour leak rate.
• Inventory control with biennial tightness testing, or groundwater or passive
vapor monitoring, which monitors stored regulated substance
o At least every 30 days, perform inventory control conducted
according to DoD Directive 4140.25; ATA Airport Fuel Facility
Operations and Maintenance Guidance Manual; or equivalent
procedures that can detect a leak equal to or less than 0.5 percent of
flow through and either:
• At least every two years, perform a tank tightness test that can
detect a 0.5 gallon per hour leak rate, or
• At least every 30 days, perform passive vapor monitoring or
groundwater monitoring conducted according to §280.43(e) or
(f), respectively, for the stored regulated substance.
• Another method approved by your implementing agency
o There may be instances where your implementing agency approves
another method. Your implementing agency may approve another
method of release detection if the owner or operator can demonstrate
the method can detect a release as effectively as any of methods listed
above. In comparing methods, your implementing agency shall
consider the size of release the method can detect and frequency and
reliability of detection.
Remember, all FCTs and all tanks that are part of an AHS installed after April 11,
2016 must have secondary containment with interstitial monitoring.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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No later than October 13, 2018, you must conduct periodic
walkthrough inspections for your airport hydrant systems
and field-constructed tanks to make sure your equipment is
working properly and to find and correct problems early.
Walkthrough inspections must cover:
Every 30 days:
• If confined space entry according to Occupational
Safety and Health Administration (OSHA; see 29
CFR part 1910) is not required, visually check
hydrant pits and vaults for any damage, remove any
liquid and debris, and check for any leaks.
• Spill prevention equipment
o Visually check for damage
o Remove liquid or debris
o Check for and remove obstructions in the fill
pipe
o Check the fill cap to make sure it is securely
on the fill pipe
o For double-walled spill prevention
equipment with interstitial monitoring, check
for a leak in the interstitial area
o For tanks that receive deliveries less
frequently than every 30 days, the spill
prevention equipment inspection may be
conducted before each delivery
• Release detection equipment
o Check to make sure the release detection
equipment is operating with no alarms or
other unusual operating conditions present
o Ensure release detection records are
reviewed and current
o Owners and operators who monitor their
release detection system remotely may check
the release detection equipment and records
remotely as long as the release detection
systems at the locations are determined to be
in communication with the remote
monitoring equipment
Hydrant pits are located on
the fueling apron and
contain valves used to
connect the fuel servicing
vehicle or cart to the
hydrant system.
Hydrant piping vaults
Check with your
implementing agency to
determine whether
inspections you may already
be performing according to
other recommended
practices are sufficient to
meet the UST requirements
in the 2015 UST regulation.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Annually:
• If confined space entry according to OSHA is required,
visually check hydrant pits and vaults for any damage,
remove any liquid and debris, and check for any leaks
• Containment sumps
o Visually check for damage, leaks to the containment
area, and releases to the environment
o Remove liquid from containment sumps
o Remove debris
o For double-walled sumps with interstitial
monitoring, check for leaks in the interstitial area
• Hand-held release detection equipment
o Check devices such as tank gauge sticks or
groundwater bailers for operability and
serviceability
You can also conduct walkthrough inspections according to a
standard code of practice developed by a nationally-recognized
association or independent testing laboratory or according to
requirements developed by your implementing agency, if the code
of practice checks equipment in a manner comparable to the
requirements above.
You may perform walkthrough inspections yourself or have a
third party conduct them.
You must keep records of your walkthrough inspections for one
year. See a sample checklist on the next page.
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Sample Walkthrough Inspection Checklist
Your initials in each box below the date of the inspection indicate the device or system was inspected
and satisfactory on that date. Keep this record for one year after last inspection date on the form.
Date Of Inspection
Required Every 30 Days (Exception: if your LIST system receives deliveries at intervals greater than 30
days, you may check your spill prevention equipment prior to each delivery).
Visually check spill prevention equipment for damage.
Remove liquid or debris.
If confined space entry is not needed, visually check
hydrant pit for damage. Remove liquid or debris, and
check for leaks.
If confined space entry is not needed, visually check
hydrant piping vaults for any leaks.
Check for and remove obstructions in fill pipe.
Check fill cap to ensure it is securely on fill pipe.
For double-walled spill prevention equipment with
interstitial monitoring, check for a leak in the interstitial
area.
Check release detection equipment to ensure it is
operating with no alarms or unusual operating conditions
present.
Ensure release detection records are reviewed and
current.
Required Annually
If confined space entry is needed, visually check hydrant
pit for damage. Remove liquid or debris, and check for
leaks.
If a confined space entry is needed, visually check
hydrant piping vaults for leaks.
Visually check containment sumps for damage and leaks
to the containment area or releases to the environment.
Remove liquid in containment sumps or debris.
For double-walled containment sumps with interstitial
monitoring, check for a leak in the interstitial area.
Check hand-held release detection equipment, such as
groundwater bailers and tank gauge sticks for operability
and serviceability.
Recommended Activities
Fill and monitoring ports: Inspect all fill or monitoring
ports and other access points to make sure that the
covers and caps are tightly sealed and locked.
Spill and overfill response supplies: inventory and
inspect the emergency spill response supplies. If
supplies are low, restock the supplies. Inspect supplies
for deterioration and improper functioning.
Containment sump areas: look for significant corrosion
on the LIST equipment.
Dispenser hoses, nozzles, and breakaways: inspect for
loose fittings, deterioration, obvious signs of leaks, and
improper functioning.
Explain below actions taken to fix issues:
Requirements For Field-Constructed Tanks And Airport Hydrant
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Compatibility With
Biofuels And Other
Regulated Substances
Compatibility is the ability of two or more substances — in
this case, your UST system and the regulated substance
stored — to maintain their respective physical and chemical
properties when in contact with one another. Compatibility
is required for the design life of the UST system and under
conditions likely to be encountered by the UST.
No later than October 13, 2018 you must meet these
requirements.
Your UST system must be made of or lined with materials
compatible with the regulated substance stored.
You must notify your implementing agency at least 30 days
before switching to any of these products and must meet the
compatibility requirement for storing the following fuels:
• Regulated substances containing greater than 10
percent ethanol.
• Regulated substances containing greater than 20
percent biodiesel.
• Any other regulated substance identified by your
implementing agency.
In addition, you must meet specific requirements for storing
these fuels. You may either demonstrate you are using
equipment or components approved for use with the
regulated substance stored, or use another option determined
by your implementing agency to be no less protective of
human health and the environment than the compatibility
demonstration options listed below. Ways to demonstrate
compatibility include having the following documentation:
• Certification or listing of the equipment or
component by a nationally recognized, independent
testing laboratory for use with the regulated
substance stored; or
• Written statement from the manufacturer affirming
the equipment or component is compatible with the
regulated substance stored.
It is important for you to
make sure your FCTs and
AHSs are compatible with
the fuel stored in them.
The composition of jet fuel is
different from gasoline and
diesel and must meet
stringent, safety-based fuel
specifications for use in
aircraft.
The commercial aviation
industry is actively
developing alternative drop-
in jet fuels that meet these
specifications.
Accordingly, EPA anticipates
that fuels stored in AHSs will
contain jet fuel, including
alternatives that meet these
stringent specifications.
As long as you store
regulated substances
containing greater than 10
percent ethanol, greater
than 20 percent biodiesel, or
any other regulated
substance identified by your
implementing agency, you
must keep records
demonstrating compliance
with the compatibility
requirement.
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No later than October 13, 2018, you must have designated
Class A, B, and C operators and train them on their UST
responsibilities. There are three classes of operators, each
with different responsibilities:
• Class A operator is the person who has primary
responsibility to operate and maintain the UST
system according to the UST regulation. Class A
operator training provides a general knowledge of
the UST regulation.
• Class B operator is the person who has day-to-day
responsibility for implementing the UST regulation.
Class B operator training provides more in-depth
understanding of operation and maintenance aspects
of the UST regulation.
• Class C operator is any person responsible for the
immediate response to a problem at an UST facility,
such as a gas station attendant. Class C operator
training must cover how to respond to an alarm or
emergency.
A single individual may be designated as more than one
class of operator, as long as that individual is trained in all
responsibilities for each class of operator designated.
Operators may need to be retrained if the UST system is not
in compliance.
You must keep a list of currently designated operators
trained for each facility and proof of training or retraining
for each operator. You may keep the records off site.
Most states already have their own operator training
program. Contact your implementing agency for
information specific to the state where your USTs are
located.
Although airports are
required to follow the
Federal Aviation
Administration (FAA) fuel
facility training
requirements and other
recommended practices,
check with your
implementing agency to
ensure that those activities
are sufficient to meet the
UST requirements.
See
und-storaee-tank-ust-
contacts#states for a list of
contacts.
Facilities with USTs in
temporary closure must
have trained operators no
later than October 13, 2018.
Requirements For Field-Constructed Tanks And Airport Hydrant
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Can Leaking Tanks Be Repaired?
You can repair a tank if the person who repairs the tank
carefully follows standard industry codes that establish the
correct way to conduct repairs. See
www.epa.gov/ust/underground-storage-tanks-usts-laws-
regulations#code for industry codes and standards.
No later than October 13, 2018, you must meet the
following requirements:
Within 30 days of the repair, you must prove that the tank is
repaired by:
• Having the tank inspected internally or tightness
tested following standard industry codes; or
• Using one of the monthly release detection
monitoring methods on pages 21-25; or
• Using other methods approved by your
implementing agency.
Within 30 days after repairs to secondary containment areas
of tanks, you must have the secondary containment tested
for tightness.
Within 30 days after repairs to spill or overfill prevention
equipment, you must test or inspect the repaired spill or
overfill prevention equipment, as appropriate, to ensure it is
operating properly.
Within six months of repair, USTs with cathodic protection
must be tested to show that the cathodic protection is
working properly.
Can Leaking Piping Be Repaired?
No later than October 13, 2018, you must meet the
following requirements:
Requirements For Field-Constructed Tanks And Airport Hydrant
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Damaged metal piping cannot be repaired and must be replaced.
Loose fittings can be tightened, and in some cases that may solve
the leaks.
Piping made of fiberglass-reinforced plastic can be repaired, but
only according to the manufacturer's instructions or national codes
of practice. Within 30 days of the repair, piping must be tested in
the same ways noted above for testing tank repairs, except for
internal inspection.
Within 30 days after repairs to secondary containment areas of
piping used for interstitial monitoring and to containment sumps
used for interstitial monitoring of piping, you must have the
secondary containment tested for tightness.
After April 11, 2016, if you repair 50 percent or more of your
piping in a single piping run, that piping must be replaced. This
only applies to piping associated with field-constructed tanks less
than or equal to 50,000 gallons in capacity. This means you must
remove the entire piping run and install secondarily contained
piping.
You must also use interstitial monitoring and an automatic line
leak detector for release detection. For pressurized piping, a piping
run is all piping that connects the submersible turbine pump to all
of the dispensers fed by that pump. For suction piping, a piping
run is the piping that runs between the tank and the suction pump.
What Records Must You Keep?
No later than October 13, 2018, you must keep records for each
repair until the UST is permanently closed or undergoes a change-
in-service.
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You must maintain documentation showing you have the
financial resources to clean up your UST site if a release
occurs, correct environmental damage, and compensate
third parties for injury to their properties or themselves. The
amount of coverage depends on the type and size of your
business, as summarized in the chart below.
Group Of UST
Owners And Operators
Petroleum marketers
or
owners and operators
who handle more than
10,000 gallons per
month
All others
$1 million
$500,000
Aggregate
Coverage
$1 million if you have
100 or fewer USTs
or
$2 million
if you have more
than 100 USTs
You have several options to demonstrate financial
responsibility. These include:
• Obtain insurance coverage from an insurer or a risk
retention group;
• Use a financial test to demonstrate self-insurance;
obtain corporate guarantees, surety bonds, or letters
of credit;
• Place the required amount into a trust fund
administered by a third party; or
• Rely on coverage provided by a state financial
assurance fund.
Local governments also have four additional options
tailored to their specific characteristics: a bond rating test, a
financial test, a guarantee, and a dedicated fund.
For FCTs and AHSs installed on or before October 13,
2015, you have until October 13, 2018 to submit your one-
time notification of tank system existence form. The
financial responsibility requirement applies when you
submit your notification form.
For FCTs and AHSs installed after October 13, 2015, the
financial responsibility requirement applies at installation.
Financial Responsibility
Requirements For
Underground Storage Tanks
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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Warning signals indicate that your UST may be leaking and
creating problems for the environment and your business.
You can minimize these problems by paying careful
attention to early warning signals and reacting quickly
before major problems develop.
You should suspect a release when you observe these
warning signals:
• Unusual operating conditions. Check first to see if
the problem results from equipment failure that can
be immediately repaired or replaced. Remember to
remove any liquid not used for interstitial monitoring
from the interstitial space of secondarily contained
systems.
• Results from release detection monitoring and
testing that indicate a release. In the event of an
alarm, investigate to determine whether the cause of
the alarm is from a non-release event such as a
power surge.
If you investigate an unusual operating condition or release
detection alarm and determine a release has not occurred,
you do not need to report a suspected release as long as you
immediately fix the problem. Otherwise, you need to call
your implementing agency and report the suspected release.
Then find out quickly if the suspected release is an actual
release. Use these investigative steps:
• Conduct tightness testing or interstitial integrity
testing of the entire UST system.
• Check the site for additional information on the
presence and source of contamination.
If the system tests and site checks confirm that a release has
occurred, follow the actions for responding to confirmed
releases described below.
You must also respond quickly to any evidence of released
petroleum that appears at or near your site. For example, if
a release is discovered during routine monitoring or an oily
Requirements For Field-Constructed Tanks And Airport Hydrant
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sheen is observed floating on the surface of an adjacent waterway,
you must report this discovery immediately to your implementing
agency and take the investigative steps and follow-up actions noted
above.
Your action to confirmed releases comes in two stages: short term
and long term.
Short-Term Actions
• Take immediate action to stop and contain the release.
• Report the release to your implementing agency within 24
hours or the time frame required by your implementing
agency. However, petroleum spills and overfills of less
than 25 gallons do not have to be reported if you
immediately contain and clean up these releases.
• Make sure the release poses no immediate hazard by
removing explosive vapors and fire hazards. Your fire
department should be able to help or advise you with this
task. Make sure you handle contaminated soil properly so
that it poses no hazard from vapors or direct contact.
• If necessary, remove petroleum from the UST system to
prevent further release into the environment.
• Find out how far the petroleum has moved and begin to
recover the released petroleum, such as product floating on
the water table. Report your progress and any information
you collect to your implementing agency no later than 20
days after confirming a release.
• Investigate to determine if the release has or might damage
the environment. This investigation must determine the
extent of soil and groundwater contamination. You must
report to your implementing agency site investigation
results according to the schedule established by your
implementing agency. At the same time, you must also
submit a report explaining how you plan to clean up the
site. Additional site studies may be required.
Long-Term Actions
Based on the information you provide, your implementing agency
will decide if you must take further action at your site. You may
need to take two more actions:
• Develop and submit a corrective action plan that shows
how you will meet requirements established for your site
by your implementing agency.
• Make sure you implement the actions approved by your
implementing agency for your site.
Contact your implementing
agency for additional
guidance on spill reporting,
doing site assessments, and
performing corrective
action.
Requirements For Field-Constructed Tanks And Airport Hydrant
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You may close your UST temporarily or permanently.
Closing Temporarily
You may temporarily close your UST by following these
requirements:
• Continue to maintain and monitor corrosion
protection systems
• Continue to maintain financial responsibility
• No later than October 13, 2018, your Class A, B, and
C operators must be trained
• If your temporarily closed UST is not empty, you
must also:
o Continue to monitor for leaks by performing
release detection
o Begin performing monthly walkthrough
inspections for your release detection no later
than October 13,2018
o Begin performing annual inspections and
tests of release detection equipment no later
than October 13, 2018
o Begin performing three year containment
sump testing if using the containment sump
for interstitial monitoring of the piping no
later than October 13, 2018
• If a release is discovered, quickly stop the release,
notify your implementing agency, and take
appropriate action to clean up the site
• If the UST remains temporarily closed for more than
three months, leave vent lines open, but cap and
secure all other lines, pumps, manways, and
ancillary equipment
USTs in temporary closure are not required to meet the
following requirements:
• Spill prevention equipment and periodic testing
• Overfill prevention equipment and periodic
inspections
• Empty USTs do not require:
Facilities with USTs in
temporary closure must
have trained operators no
later than October 13, 2018.
Some implementing
agencies require removal of
the regulated substance
from the tank while in
temporary closure. Other
implementing agencies may
require permanent closure
after one year. Check with
your implementing agency
for additional information
on UST closure.
Requirements For Field-Constructed Tanks And Airport Hydrant
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o Release detection
o Annual release detection testing and inspections
o Monthly walkthrough inspections
o Three year containment sump testing
An UST is considered empty if no more than one inch of residue is
present or not more than 0.3 percent by weight of the total capacity
of the UST system remains in the system.
After 12 months of temporary closure, you must permanently close
your UST if the tank does not meet the corrosion protection
requirements. You can indefinitely keep your UST closed
temporarily, if it meets the requirements for new or upgraded
USTs, except that spill and overfill requirements do not have to be
met, and you meet the requirements above for temporarily closed
USTs.
USTs in temporary closure
do not need spill or overfill
prevention equipment
because they should not be
receiving fuel deliveries.
Closing Permanently
If you decide for any reason to close your UST permanently,
follow these requirements for permanent closure:
• You must notify your implementing agency 30 days before
you permanently close your UST.
• You must determine if contamination from your UST is
present in the surrounding environment. If there is
contamination, you will have to take the actions described
on pages 34 and 35.
• You can either remove the UST from the ground or leave it
in the ground. In both cases, the tank must be emptied and
cleaned by removing all liquids, dangerous vapor levels,
and accumulated sludge. These potentially very hazardous
actions need to be carried out carefully by following
standard safety practices. See www.epa.gov/ust/resources-
owners-and-operators#closing for a safe closure standard.
If you leave the UST in the ground, you must also either fill
it with a harmless, chemically inactive solid, like sand, or
close it in place in a manner approved by your
implementing agency. Your implementing agency can help
you decide how best to close your UST so that it meets
local requirements for closure.
People can be killed or
injured while closing or
removing tanks. Use safe
removal practices; see
www.epa.gov/ust/resources-
owners-qnd-
operators#closing for a safe
closure standard. Only
trained professionals should
close or remove USTs.
Requirements For Field-Constructed Tanks And Airport Hydrant
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You must keep records that you can provide to an inspector during an inspection and prove your
facility meets certain requirements. Check with your implementing agency to determine if there
are additional records you must keep. See tables on pages 7-12 for specific implementation dates
for existing and new systems.
You Must Keep These Records:
For This Long:
Spill And Overfill Prevention
Testing and inspection records for spill and overfill prevention equipment and
containment sumps used for interstitial monitoring of piping
Documentation showing spill prevention equipment and containment sumps used for
interstitial monitoring of piping is double-walled and the integrity of both walls is
periodically monitored
Three years
For as long as periodic
monitoring is conducted
Corrosion Protection
Records of your 60-day inspections for your impressed current corrosion
protection system
Records of cathodic protection tests for your corrosion protection system
Three most recent
inspections
Two most recent tests
Release Detection
30-day monitoring results
Tightness test results
Records for your annual release detection equipment tests
Copies of performance claims provided by release detection equipment manufacturers
or equipment installers
Records of maintenance, repair, and calibration of on-site release detection equipment
If you use vapor monitoring or groundwater monitoring, records of a site assessment
showing that the monitoring system is set up properly
One year
Until the next test
Three years
Five years
One year after servicing
is completed
For as long as vapor
monitoring or
groundwater monitoring
is used
Walkthrough Inspections
Records showing you performed periodic walkthrough inspections
One year
Compatibility
If you store certain biofuels or other substances identified by your implementing agency,
you must keep records demonstrating compliance with the compatibility requirement
For as long as the LIST
system stores the
regulated substance
Operator Training
Records for each designated Class A, B, and C operator showing they have been trained
For as long as the
operator is designated at
the facility
Repairs
Records showing that a repaired LIST system or LIST system component was properly
repaired
Until the UST system is
permanently closed or
undergoes a change-in-
service
Financial Responsibility
Records that document you have financial responsibility, as explained in EPA's
booklet, Dollars And Sense www.epa.aov/ust/dollars-and-sense-financial-
responsibilitv-requirements-underqround-storaqe-tanks
Until the UST system is
permanently closed or
undergoes a change-in-
service
Closure
Records of the site assessment results required for permanent closure
For at least three years
after closing an UST
Requirements For Field-Constructed Tanks And Airport Hydrant
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Links For More Information
Government Links
• U.S. Environmental Protection Agency's Office
of Underground Storage Tanks:
www.epa.gov/ust. EPA's UST compliance
assistance: www.epa.gov/ust/resources-owners-
and-operators
• State UST program contact information:
www. epa. gov/ust/underground-storage-tank-ust-
contacts#states
• Tanks Subcommittee of the Association of State
and Territorial Solid Waste Management Officials
(ASTSWMO): www.astswmo.org/
• New England Interstate Water Pollution Control
Commission (NEIWPCC): www.neiwpcc.org
Industry Codes And Standards
www.epa.gov/ust/underground-storage-tanks-usts-laws-
regulations#code
Other Organizations To Contact For UST
Information
www. epa. gov/ust/underground-storage-tank-ust-
contacts#other
Requirements For Field-Constructed Tanks And Airport Hydrant
April 2016
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&EPA
United States
Environmental Protection
Agency
United States Environmental Protection Agency
5401P
Washington, DC 20460
EPA 510-K-16-002
April 2016
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