USTs containing any substance listed in Appendix A of this
chapter are hazardous substance USTs. Owners and/or operators of hazardous
substance UST systems shall provide release detection that meets the following
requirements:
(a)
Release
detection: Hazardous substance UST systems shall have a secondary
containment system, be constructed with double walled tanks, or be constructed
with an external liner or vault surrounding the entire tank system. These
systems shall meet the following requirements:
(i) Secondary containment systems shall:
(A) be designed, constructed and installed to
contain regulated substances released from the tank system until those
substances are detected and removed;
(B) be designed, constructed and installed to
prevent the release of regulated substances to the environment at any time
during the operational life of the UST system; and
(C) be inspected for evidence of a release at
least once every thirty (30) days.
(ii) Double-walled tanks shall:
(A) Be designed, constructed, and installed
to contain a release from any portion of the inner tank within the outer
wall;
(B) Be designed, constructed,
and installed to detect the failure of the inner wall; and
(C) Be inspected for evidence of a release at
least once every thirty (30) days.
(iii) External liners, (including vaults)
shall:
(A) Be designed, constructed, and
installed to contain one hundred percent (100%) of the capacity of the largest
tank within its boundary;
(B) Be
designed, constructed, and installed to prevent the interference of
precipitation or groundwater intrusion with the ability to contain or detect a
release of regulated substances;
(C)
Be designed, constructed, and installed to surround the tank completely (i.e.,
it is capable of preventing lateral as well as vertical migration of regulated
substances); and
(D) Be inspected
for evidence of a release at least every thirty (30)
days.
(b)
Connected Piping: Connected piping shall be equipped with
secondary containment that satisfies the requirements of this section. Trench
liners and double-walled pipe are examples of secondary containment systems.
Connected piping that conveys regulated substances under pressure shall be
equipped with an automatic line leak detector in accordance with Section
14(g)(i).
(c)
Other
methods: Other methods of release detection may be used if owners
and/or operators:
(i) Demonstrate to the
department that an alternate method can detect a release of the stored
regulated substance as effectively as any of the methods allowed in Section
16(b) through (h) can detect a release of petroleum;
(ii) Provide information to the department on
effective corrective action technologies, health risks, and chemical and
physical properties of the stored substance, and the characteristics of the UST
site; and
(iii) Obtain authorization
from the department to use the alternate release detection method before the
installation and operation of the new or modified UST
system.
