All new or replacement gasoline tanks and their components shall
be designed and constructed in accordance with the following specifications
in order to provide maximum protection against corrosion and leakage.
A. Type of tank. Only the following tank systems shall be approved:
(1) UL-listed fiberglass-reinforced plastic (FRP) tanks. Fiberglass tanks
shall be installed only by an installation contractor approved by
the manufacturer of the tank.
(2) UL-listed steel tanks provided with cathodic protection, with a coal-tar
epoxy or urethane coating and electrical isolation, and equipped with
a test box to measure electrical potential.
(3) Steel tanks with bonded fiberglass coating, compatible inner corrosion-resistant
lining and electrical isolation, the integrity of the outer coating
to be verified by electrostatic testing and guaranteed by the manufacturer.
(4) Double-walled steel tanks with bonded fiberglass coating, electrical
isolation, a vacuum of air pressure in the interstitial space and
provision for continuous monitoring of the vacuum or air pressure.
(5) Any other "state-of-the-art" type tank construction approved by the
State Fire Marshal, by the Board of Health and Fire Chief.
B. Striker plates. All new or replacement gasoline tanks must be equipped
with a metallic or nonmetallic striker plate, at least 24 inches by
24 inches in area, at least 1/4-inch thick, and attached to the bottom
of the tank under each opening.
C. Corrosion protection. All new or replacement tanks, including all
accessory components, shall be protected against corrosion by use
of noncorrosive materials or by use of cathodic protection and electrical
isolation and be compatible with the product to be stored in the facility.
All cathodic protection systems shall be tested annually by a qualified
person and shall have at all times a negative voltage of at least
0.85 volt, as measured by a test box, between the structure being
protected and a saturated copper-copper sulfate reference electrode
contacting the soil electrolyte; provided that if a zinc reference
electrode is used, the negative voltage must be at least 1.95 volts.
These measurements shall be made with sacrificial anodes attached,
or if impressed current is used, with the rectifier turned on.
D. Testing compatibility. All new or replacement gasoline tanks shall
be designed, constructed and installed so as to allow testing for
tightness or replacement without the need for disturbing elements
of the storage facility other than the elements that are to be tested
or replaced.
E. Backfilling. The Board of Health and the Fire Chief, or their agents,
shall be present during the backfilling operations. The quality of
the materials used for backfilling shall be subject to the approval
of the Board of Health and Fire Chief, or their agents.
F. Testing after installation. All new or replacement tanks and their
components shall be tested separately at the owner's expense, prior
to being covered. The tank shall be tested hydrostatically, or by
air pressure at not less than three pounds per square inch but not
more than five pounds per square inch. The piping shall be tested
hydrostatically to 150% of the maximum anticipated pressure of the
system or tested pneumatically, after all joints and connections have
been coated with soap solution, to 100% of the maximum anticipated
pressure of the system, but not less than 50 pounds per square inch
at the highest point of the system. After the tank and piping have
been fully covered, the area paved and the tank filled with product,
the tank and its piping shall be again tested, separately, at the
owner's expense, by any state-approved test, not involving air pressure,
which is accurate to 0.05 gallon per hour or less, after the adjustment
for variables, and which is approved by the Board of Health with a
certified copy of the results of all testing required by this subsection,
which the Board of Health shall keep with the records for the storage
facility.
Effective January 1, 1988, all underground gasoline storage systems which do not meet the design specifications as set forth in §
363-8 shall be removed and properly disposed of at an age of 20 years after installation.