Spill & overfill prevention for USTs: helping prevent underground storage tank (UST) system releases

              Spill & Overfill Prevention
for USTs
THINGS TO CONSIDER ABOUT SPILL AND
OVERFILL PREVENTION EQUIPMENT
SYSTEMS
All UST systems that are filled with more than 25 gal-lons
of a regulated substance at any time must have
spill and overfill prevention equipment systems.
SPILL PREVENTION
WHAT IS IT?
􀁘􅡓 Spill of a regulated substance during a transfer from
the truck to the tank must be captured by a bucket
that fits around the fill pipe.
􀁘􅡓 Spill prevention will prevent a release of a regulated
substance to the environment.
􀁘􅡓 Spill prevention devices are called Spill Buckets or
Catchment Basins.
􀁘􅡔 The spill buckets should be sized so that it can hold
more than the amount of product contained in the
delivery hose.
MAINTENANCE
􀁘􅡄 Device should be kept free of product, water,
and/or debris.
􀁘􅡄 Device should show no signs of damage.
REQUIRED DOCUMENTATION
􀁘􅡍 Must show the spill bucket was installed by an
ADEQ-certified service provider for "Installation
and retrofit of an UST."
Talk to your ADEQ-certified service provider about
spill prevention equipment and maintenance options
that suit your UST system.
OVERFILL PREVENTION
Answering the following questions may help to deter-mine
the appropriate type of overfill protection
equipment for your UST system.
􀁘􅡗 What type of overfill device do I currently have?
􀁘􅡈 How will the overfill device affect the usable
volume of my tank?
􀁘􅡁 At what level should my overfill device be set and
is it set at that level?
􀁘􅡄 Do I have the required certified documentation?
WHAT IS IT?
􀁘􅡁 A device that prevents overfilling of a UST system.
􀁘􅡄 Device must be set at the appropriate activation
level.
􀁘􅡁 An overfill prevention device is required on any
UST system that is filled with more than 25 gallons
of product at any one time.
OVERFILL DEVICES & ACTIVATION LEVELS
􀁘􅡁 Automatic Shutoff Device - Automatically shuts off
flow of fuel at 95 % or less of tank capacity.
􀁘􅡂 Ball Float Valve - Restricts vapor flow out of the
vent line at 90 % or less of tank capacity, or within
30 minutes before overfilling.
􀁘􅡏 Overfill Alarm - Alarm activates when the fuel
reaches 90 % of less tank capacity, or is within one
minute of being overfilled.
REQUIRED DOCUMENTATION
􀁘􅡆 For overfilled equipment installed before
December 31, 1996, ADEQ requires the installers
signature, company name and overfill device acti-vation
level.
􀁘􅡆 For overfill device installed after December 31,
1996, provide documentation that the overfill
device installation and activation level were com-pleted
by an ADEQ-certified installation and retro-fit
service provider.
It is important to provide certified documentation stating
the appropriate activation level. If the activation level
was not previously certified by the installer, then an
ADEQ-certified individual performing installation and
retrofit or tank tightness testing can verify and certify the
activation level.
FOR MORE INFORMATION CONTACT:
Arizona Department of Environmental Quality
UST & Division Support Section
1110 West Washington Street
Phoenix, Arizona 85007
(602) 771-4303
toll free number: (800) 234-5677 Ext:771-4303
Website: www.azdeq.gov
SPILL PREVENTION DEVICE
􀂆􈙄 Documentation of certified installation
􀂆􈙓 Size (gallons)
􀂆􈙋 Kept free of product, water and debris
􀂆􈙎 No visible damage
OVERFILL PREVENTION DEVICE
􀂆􈙄 Documentation of certified installation and
activation level
􀂆􈙔 Type of overfill device
􀂆􈙁 Appropriate activation level
C H E C K L I S T
In the event of any discrepancy between this infor-mation
and the Arizona Revised Statutes or Arizona
Administrative Code, the statutes or rules shall take
precedence.
Publication Number: C05-07