| (iii) Piping installed or replaced on or after January
1, 2009. In addition to the required line leak detector prescribed
in clause (i) of this subparagraph, each pressurized pipe shall also
be tested or monitored for releases at least once every 30 days by
using interstitial monitoring as prescribed in subsection (d)(7) of
this section as the primary release detection method no later than
September 1, 2018.
(B) Requirements for suction piping and gravity flow
piping.
(i) Piping installed prior to January 1, 2009. Except
as provided in clause (iii) of this subparagraph, each separate pipe
in a UST piping system that conveys regulated substances either under
suction or by gravity flow shall meet at least one of the following
requirements.
(I) Each separate pipe may be tested at least once
every three years by means of a positive or negative pressure tightness
test applicable to underground product piping and conducted in accordance
with a code or standard of practice developed by a nationally recognized
association or independent testing laboratory. Any such piping test
shall be capable of detecting any release from the piping system of
0.1 gallons per hour.
(II) Each pipe may be monitored for releases at least
once every 30 days by using one or more of the release detection methods
prescribed in subsection (d)(5) - (10) of this section.
(ii) Piping installed or replaced on or after January
1, 2009. Except as provided in clause (iii) of this subparagraph,
each suction line shall be tested or monitored for releases at least
once every 30 days by using interstitial monitoring as prescribed
in subsection (d)(7) of this section as the primary release detection
method no later than September 1, 2018.
(iii) No release detection methods are required to
be installed or applied for any piping system that conveys regulated
substances under suction when such suction piping system is designed
and constructed in accordance with the following standards:
(I) the below-grade piping operates at less than atmospheric
pressure;
(II) the below-grade piping is sloped so that all the
contents of the pipe will drain back into the storage tank if the
suction is released;
(III) no more than one check valve is included in each
suction line;
(IV) the check valve is located aboveground, directly
below and as close as practical to the suction pump; and
(V) verification that the requirements under subclauses
(I) - (IV) of this clause have been met can be provided in the form
of:
(-a-) signed as-built drawings or plans provided by
the installer or by a professional engineer who is duly licensed to
practice in Texas; or
(-b-) signed written documentation provided by a UST
contractor who is properly registered with the agency, by a UST installer
who is properly licensed with the agency, or by a professional engineer
who is duly licensed to practice in Texas.
(C) Monitoring secondary containment. In addition to
the requirements in subparagraphs (A) and (B) of this paragraph, all
piping in a hazardous substance UST system shall also be equipped
with a secondary containment system and related release detection
equipment, as prescribed in subsection (c) of this section.
(c) Additional release detection requirements for hazardous
substance UST systems. In addition to the release detection requirements
for all UST systems prescribed in subsections (a) and (b) of this
section, owners and operators of all hazardous substance UST systems
shall also assure compliance with the following additional requirements.
(1) All new hazardous substance UST systems shall be
in compliance with the requirements of paragraph (3) of this subsection
for the entire operational life of the system.
(2) All existing hazardous substance UST systems shall
be brought into compliance with the requirements of paragraph (3)
of this subsection no later than December 22, 1998.
(3) Secondary containment. All hazardous substance
UST systems (including tanks and piping) shall be equipped with a
secondary containment system which shall be designed, constructed,
installed, and maintained in accordance with §334.45(d) and §334.46(f)
of this title (relating to Technical Standards for New Underground
Storage Tank Systems; and Installation Standards for New Underground
Storage Tank Systems).
(4) Release detection.
(A) All hazardous substance UST systems (including
tanks and piping) installed prior to January 1, 2009, shall include
one or more of the release detection methods or equipment prescribed
in subsection (d)(7) - (10) of this section, which shall be capable
of monitoring the space between the primary tank and piping walls
and the secondary containment wall or barrier.
(B) All hazardous substance UST systems (including
tanks and piping) installed on or after January 1, 2009, shall be
monitored by using interstitial monitoring as prescribed in subsection
(d)(7) of this section as the primary release detection method no
later than September 1, 2018.
(d) Allowable methods of release detection. Tanks in
a UST system may be monitored for releases using one or more of the
methods included in paragraphs (2) - (10) of this subsection. Piping
in a UST system may be monitored for releases using one or more of
the methods included in paragraphs (5) - (10) of this subsection.
Any method of release detection for tanks and/or piping in this section
shall be allowable only when installed (or applied), operated, calibrated,
and maintained in accordance with the particular requirements specified
for such method in this subsection.
(1) Tank tightness and inventory control requirements.
A combination of tank tightness testing and inventory control may
be used as a tank release detection method only until December 22,
1998, subject to the following conditions and requirements.
(A) Tank tightness test. Any tank tightness test shall
be conducted in conformance with the following standards.
(i) The tank tightness test shall be conducted in accordance
with a code or standard of practice developed by a nationally recognized
association or independent testing laboratory.
(ii) The tank tightness test shall be performed by
qualified personnel who possess the requisite experience, training,
and competence to conduct the test properly, who are present at the
facility and who maintain responsible oversight throughout the entire
testing procedure, and who have been certified by the manufacturer
or developer of the testing equipment as being qualified to perform
the test. The tank tightness test shall be conducted in strict accordance
with the testing procedures developed by the system manufacturer or
developer.
(iii) The tank tightness test shall be capable of detecting
a release of 0.1 gallons per hour from any portion of the tank which
contains regulated substances.
(iv) The tank tightness test shall be performed in
a manner that will account for the effects of vapor pockets, thermal
expansion or contraction of the stored substance, temperature of the
stored substance, temperature stratification, evaporation or condensation,
groundwater elevation, pressure variations within the system, tank
end deflection, tank deformation, and any other factors that could
affect the accuracy of the test procedures.
(B) Inventory control. All inventory control procedures
shall be in conformance with the following requirements.
(i) All inventory control procedures shall be in accordance
with a code or standard of practice developed by a nationally recognized
association or independent testing laboratory, such as American Petroleum
Institute Publication 1621, "Bulk Liquid Stock Control at Retail
Outlets;" and
(ii) Reconciliation of detailed inventory control records
shall be conducted at least once every 30 days, and shall be sufficiently
accurate to detect a release as small as the sum of 1.0% of the total
substance flow-through for the 30-day period plus 130 gallons.
(iii) The operator shall assure that the following
additional procedures and requirements are followed.
(I) Inventory volume measurement for regulated substance
inputs, withdrawals, and the amount still remaining in the tank shall
be recorded each operating day.
(II) The equipment used shall be capable of measuring
the level of stored substance over the full range of the tank's height
to the nearest 1/8 inch.
(III) Substance dispensing shall be metered and recorded
within an accuracy of six or less cubic inches for every five gallons
of product withdrawn.
(IV) The measurement of any water level in the bottom
of the tank shall be made to the nearest 1/8 inch at least once every
30 days, and appropriate adjustments to the inventory records shall
be made.
(2) Manual tank gauging. Manual tank gauging may be
used as a tank release detection method, subject to the following
limitations and requirements.
Cont'd... |
