Current through Register Vol. 6, March 22, 2024
(1) Except as provided in (3), owners and
operators of petroleum UST systems shall provide release detection for tanks
and piping as follows:
(a) tanks must be
monitored at least every 30 days for releases using one of the methods listed
in ARM
17.56.407(1)(d)
through (h) except that:
(i) UST systems that meet the performance
standards in ARM
17.56.201
or
17.56.202,
and the 30-day inventory control requirements in ARM
17.56.407(1)(a)
or (b), may use tank tightness testing
(conducted in accordance with ARM
17.56.407(1)(c)
) at least every five years until ten years after the tank was installed;
(ii) tanks with capacity of 550
gallons or less and tanks with a capacity of 551 to 1,000 gallons that meet the
tank diameter criteria in ARM
17.56.407(1)(b)
in Table 1 may use manual tank gauging (conducted in accordance with ARM
17.56.407(1)(b)
); and
(iii) farm or residential
tanks of 1,100 gallons or less capacity used for storing motor fuel for
noncommercial purposes installed prior to November 26, 2009, and a tank of
1,100 gallons or less capacity used for storing heating oil for consumptive use
on the premises where stored installed prior to November 26, 2009, may use
manual tank gauging (conducted in accordance with ARM
17.56.407(1)(b)
); and
(b) underground
piping that routinely contains regulated substances must be monitored for
releases in a manner that meets one of the following requirements:
(i) underground piping that conveys regulated
substances under pressure must:
(A) be
equipped with an automatic line leak detector conducted in accordance with ARM
17.56.408(1)(a);
and
(B) have an annual line
tightness test conducted in accordance with ARM
17.56.408(1)(b)
or monitor at least every 30 days using a method in accordance with ARM
17.56.408(1)(c);
and
(ii) underground
piping that conveys regulated substances under suction must either have a line
tightness test conducted at least every three years and in accordance with ARM
17.56.408(1)(b),
or monitor at least every 30 days using a method conducted in accordance with
ARM
17.56.408(1)(c).
No release detection is required for suction piping that is designed and
constructed to meet the following standards:
(A) the below-grade piping operates at less
than atmospheric pressure;
(B) the
below-grade piping is closed so that the contents of the pipe will drain back
into the storage tank if the suction is released;
(C) only one check valve is included in each
suction line;
(D) the check valve
is located directly below and as close as practical to the suction pump; and
(E) a method is provided that
allows compliance with (1)(b)(ii)(B) through (D) to be readily
determined;
(iii)
underground piping connected to heating oil tanks with a capacity of 660
gallons or less is exempt from the requirements of (1)(b)(i) and (ii) provided
that:
(A) the new primary underground piping
has secondary containment;
(B)
liquid released into the interstitial space will move not more than 20 feet
before being detected in a standpipe or sump;
(C) the interstice is visually monitored for
released liquid once every 30 days; and
(D) the test results are maintained for at
least one year; and
(iv)
new underground piping connected to underground heating oil tanks with a
capacity of 660 gallons or less shall slope back towards tanks that do not have
foot valves.
(2) All leak testing results required by this
rule must be observed by the owner, operator, or facility employee and the
owner or operator shall document and retain the results.
(3) Terminal piping that is connected to
aboveground storage tanks and not associated with an airport hydrant system, is
exempt from the requirements of ARM
17.56.204(2)
and (3),
17.56.304(3)(g)(i),
17.56.408(1)(a)
through (d),
17.56.504(1)(a),
and
17.56.701(4)(b)(ii)
and (d)(ii). The department may exempt other
associated piping that is connected to aboveground storage tanks and is not
associated with airport hydrant systems, on a case-by-case basis, if the
department determines the exemption would not cause harm to human health or the
environment.
(4) The exempt piping
referenced in (3) must be annually leak tested using:
(a) the procedures described in American
Petroleum Institute Recommended Practice 1110, "Recommended Practice for
Pressure Testing of Steel Pipelines for the Transportation of Gas, Petroleum
Gas, Hazardous Liquids, Highly Volatile Liquids or Carbon Dioxide," with the
following exceptions:
(i) the minimum leak
test pressure ratios may not be less than 1.0;
(ii) the leak test duration may not be less
than one hour; and
(iii) leak
acceptance criteria must be based on 5% decrease in pressure of the pipeline
segment during the test period; or
(b) another leak test procedure approved by
the department.
(5) The
department adopts and incorporates by reference the version in effect on July
1, 2013, of American Petroleum Institute Recommended Practice 1110,
"Recommended Practice for Pressure Testing of Steel Pipelines for the
Transportation of Gas, Petroleum Gas, Hazardous Liquids, Highly Volatile
Liquids or Carbon Dioxide," which sets forth guidelines for pressure testing
steel pipelines for the transportation of gas, petroleum gas, hazardous
liquids, highly volatile liquids, or carbon dioxide, a copy of which may be
obtained from Global Engineering Documents, 15 Inverness Way East, M/S C303B,
Englewood, CO 80112-5776, (303) 397-7956.
AUTH:
75-11-302,
75-11-505,
MCA; IMP:
75-11-302,
75-11-505,
MCA