CHAPTER 11. UNDERGROUND STORAGE OF HAZARDOUS SUBSTANCES*
Sec. 11-1-3. Design standards and monitoring for new facilities.
A permit to operate shall not be issued for any underground storage tank
or facility installed after January 1, 1984, unless the underground storage tank
or facility meets the following requirements:
(a) Be designed and
constructed to provide primary and secondary levels of containment of the
hazardous substances stored in them in accordance with the following performance
(1) Primary containment shall be product-tight.
containment shall be constructed to prevent structural weakening as a result of
contact with any released hazardous substances, and also shall be capable of
storing, for the maximum anticipated period of time necessary for the recovery
of any released hazardous substance.
(3) In the case of an installation with
one primary container, the second containment shall be large enough to contain
at least one hundred percent of the volume of the primary tank.
(4) In the
case of multiple primary tanks, the secondary container shall be large enough to
contain one hundred fifty percent of the volume of the largest primary tank
placed in it, or ten percent of the aggregate internal volume of all primary
tanks, whichever is greater.
(5) If the facility is open to rainfall, then
the secondary containment must be able to additionally accommodate the volume of
a twenty-four-hour rainfall as determined by a one hundred-year storm
(6) Single-walled containers do not fulfill the requirements of an
underground storage tank providing both a primary and a secondary
(7) The design and construction of underground storage tanks
for motor vehicle fuels storage need not meet the requirements of subdivisions
(1) to (6), inclusive, if the primary containment construction is of glass
fiber, reinforced plastic, cathodically protected steel, or steel clad with
glass fiber reinforced plastic, any such alternative primary containment is
installed in conjunction with a system that will intercept and direct a leak
from any part of the tank to a monitoring well to detect any release of motor
vehicle fuels stored in the tank and which is designed to provide early leak
detection, response, and to protect groundwater from releases, and if the
monitoring is in accordance with the alternative method identified in
subdivision (3) of subsection (b) of Section 11-1-4. Pressurized piping systems
connected to underground storage tanks used for the storage of motor vehicle
fuels and monitored in accordance with subdivision (3) of subsection (b) of
Section 11-1-4 shall also be deemed to meet the requirements of this
(b) Be signed and constructed with a monitoring system capable
of detecting entry of the hazardous material stored in the primary containment
into the secondary containment. If water could intrude into the secondary
containment, a means of monitoring for water intrusion and for safely removing
the water shall also be provided.
(c) When required by the permitting
authority, a means of overfill protection for any primary tank, including an
overfill prevention device or an attention-getting high level alarm, or both.
Primary tank, filling operations of underground storage tanks containing motor
vehicle fuels which are visually monitored and controlled by a facility operator
satisfy the requirements of this paragraph.
(d) Different substances that in
combination may cause a fire or explosion, or the production of flammable,
toxic, or poisonous gas, or the deterioration of a primary and secondary
containment so as to avoid potential intermixing.
(e) If water could enter
into the secondary containment by precipitation or infiltration, the facility
shall contain a means of removing the water by the owner or operator. This
removal system shall also provide for a means of analyzing the removed water for
hazardous substance contamination and a means of disposing of the water, if so
contaminated, at an authorized disposal facility. (Ord. No. 1043, § 1