Minnesota Administrative Rules
Agency 167 - Pollution Control Agency
Chapter 7150 - UNDERGROUND STORAGE TANKS; PROGRAM
REPORTING, INVESTIGATING, AND CONFIRMING RELEASES
Part 7150.0345 - REPORTING, INVESTIGATING, AND CONFIRMING RELEASES
Universal Citation: MN Rules 7150.0345
Current through Register Vol. 48, No. 39, March 25, 2024
Subpart 1. Investigating and confirming.
A.
Owners and operators must immediately investigate, confirm, and remedy all
suspected releases.
B. Within 24
hours of discovering an unusual operating condition while conducting leak
detection according to part
7150.0330 or
7150.0340, owners and operators
must investigate the condition by:
(1)
conducting a visual inspection of aboveground and exposed below-grade
components of a UST system for leaks and deficiencies; and
(2) if applicable, repeating any leak test
that indicated an unusual operating condition, conducted according to part
7150.0330, subpart 5, 6, or 6a, or
7150.0340, subpart 2, item A; 3, item B; or 4, item A.
C. Upon discovering an unusual operating
condition or confirming an unusual operating condition according to item B,
subitem (2), owners and operators must initiate within 24 hours and complete
within seven days the following::
(1)
tightness testing according to part
7150.0330, subpart 4, or
7150.0340, subpart 3, item A, on the component suspected of leaking;
and
(2) if applicable, integrity
testing, using an agency-approved tester, of interstitial and
secondary-containment areas used for leak detection.
D. If the investigation under item B or the
testing under item C indicates that the UST system is not leaking, owners and
operators may resume leak testing the UST system according to part
7150.0300.
E. If testing confirms a leak, owners and
operators must immediately remove the regulated substance from the leaking
component to prevent further releases and must repair, replace, upgrade, or
permanently close the UST system.
Subp. 2. Reporting releases or suspected releases.
A person who has knowledge of a release from a UST system under that person's control must immediately notify the Minnesota duty officer upon discovering the release by calling 1-800-422-0798 and must begin recovering the substance according to Minnesota Statutes, section 115.061. Notice under this subpart is also required if:
A. the owners and operators discover a
release of a regulated substance at the underground tank site or in the
surrounding area;
B. an unusual
operating condition exists, unless:
(1) the
system component is immediately repaired or replaced; and
(2) for secondarily contained systems, any
liquid in the interstitial space not used for monitoring is immediately
removed; or
C.
monitoring results from a release-detection method or alarm indicates a release
may have occurred, unless:
(1) the monitoring
device or alarm is found to be defective and is immediately repaired,
recalibrated, or replaced, and additional monitoring does not confirm the
initial results;
(2) the leak is
contained in a secondary-containment space and:
(a) any liquid in the secondary-containment
space not used for monitoring is immediately removed; and
(b) any defective system equipment or
component is immediately repaired or replaced; or
(3) the alarm is investigated and determined
to be a nonrelease event.
Subp. 3. Assessing site; permanent closure or status change.
A. Before
completing a tank or piping system closure according to part
7150.0410 or changing the status
of storing a nonregulated substance, owners and operators must measure, by
laboratory analysis, for the presence of a release.
B. Sampling under item A must be according to
the commissioner's requirements. The requirements must be based upon where
contamination is most likely to be present, taking into consideration the
method of closure, nature of the stored substance, type of backfill, depth to
groundwater, and other factors relevant to identifying the presence of a
release.
C. If contaminated soils,
contaminated groundwater, or free product as a liquid or vapor is discovered by
measurement under this subpart or by any other means, the Minnesota duty
officer must be immediately notified by calling 1-800-422-0798 and corrective
action must be started according to Minnesota Statutes, section
115.061.
Disclaimer: These regulations may not be the most recent version. Minnesota may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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