Current through Register Vol. 6, March 22, 2024
(1) For hazardous substance UST systems
installed after October 13, 2018, owners and operators shall provide
containment that meets the following requirements and monitor these systems
pursuant to ARM
17.56.407(1)(g)
at least every 30 days:
(a) secondary
containment systems must be designed, constructed, and installed to:
(i) contain regulated substances leaked from
the primary containment until they are detected and removed;
(ii) prevent the release of regulated
substances to the environment at any time during the operational life of the
UST system; and
(iii) be checked
for evidence of a release at least every 30 days.
(b) double-walled tanks must be designed,
constructed, and installed to:
(i) contain a
leak from any portion of the inner tank within the outer wall; and
(ii) detect the failure of the inner
wall;
(c) external
liners (including vaults) must be designed, constructed, and installed to:
(i) contain 100 percent of the capacity of
the largest tank within its boundary;
(ii) prevent the interference of
precipitation or ground water intrusion with the ability to contain or detect a
release of regulated substances; and
(iii) surround the tank completely (i.e., it
is capable of preventing lateral as well as vertical migration of regulated
substances).
(d)
underground piping must be equipped with secondary containment that satisfies
the requirements of (1)(a) (e.g., trench liners, double-walled pipe). In
addition, underground piping that conveys regulated substances under pressure
must be equipped with an automatic line leak detector in accordance with ARM
17.56.408(1).
(2) For hazardous substance UST
systems installed on or before October 13, 2018, owners and operators may use:
(a) other methods of release detection if
owners and operators:
(i) demonstrate to the
department that an alternate method can detect a release of the stored
substance as effectively as any of the methods allowed in ARM
17.56.407(1)(b)through
(i) 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 approval from the department to
use the alternate release detection method before the installation and
operation of the new UST system; or
(b) the methods of release detection set
forth in
40 CFR
265.193 (2011), Containment and Detection of
Releases.
(3) The
department adopts and incorporates by reference
40 CFR
265.193 (2011), which sets forth standards
for containment and detection of releases. A copy may be obtained from the
Superintendent of Documents, Government Printing Office, Washington, DC 20402,
(202) 783-3238. Copies are also available for public inspection and copying at
the Department of Environmental Quality, 1520 E. 6th Ave., P.O. Box 200901,
Helena, MT 59620-0901.
