| (III) any other code or standard of practice developed
by a nationally recognized association or independent testing laboratory
that has been reviewed and determined by the agency to be no less
protective of human health and safety and the environment than the
standards described in subclauses (I) and (II) of this clause, in
accordance with procedures in §334.43 of this title.
(iv) The double-wall tank system shall be installed
in accordance with the requirements in §334.46(f)(2) of this
title.
(B) External liners. Tank excavation liners may be
used to comply with the secondary containment requirements of this
paragraph, provided that such liners shall meet the following additional
provisions.
(i) The tank excavation liner shall consist of an artificially
constructed material that is of sufficient strength, thickness, puncture-resistance,
and impermeability (i.e., allow permeation at a rate of no more than
0.25 ounces per square foot per 24 hours for the stored regulated
substance) in order to permit the collection and containment of any
releases from the UST system. The criteria for evaluation of the liner
for compliance with this clause shall be in accordance with accepted
industry practices for materials testing. Types of liners which may
be used include certain reinforced and unreinforced flexible-membrane
liners, rigid fiberglass-reinforced plastic liners, and reinforced
concrete vaults.
(ii) The liner shall be protected from corrosion in
accordance with one or more of the allowable methods included in §334.49
of this title.
(iii) The liner shall be sufficiently compatible with
the stored regulated substance, so that any regulated substance collected
in the liner system shall not cause any substantial deterioration
of the liner that would allow the regulated substances to be released
into the environment.
(iv) The liner shall be designed to provide a containment
volume of no less than 100% of the full capacity of the largest tank
within its containment area.
(v) The liner shall be installed in accordance with
the requirements in §334.46(f)(4) of this title.
(4) Secondary containment for piping. One or more of
the following methods shall be used to provide secondary containment
for piping.
(A) Double-wall piping. Double-wall piping systems
may be used to comply with the secondary containment requirements
of this subchapter, provided that such piping systems meet the following
additional provisions.
(i) The double-wall piping system shall be designed
to contain a release from any portion of the primary piping within
the secondary piping walls.
(ii) The double-wall piping system (including both
the primary and secondary piping) shall be protected from corrosion
in accordance with one or more of the allowable methods included in §334.49
of this title.
(iii) The double-wall piping system shall be designed,
installed, and operated in accordance with a code or standard of practice
developed by a nationally recognized association or independent testing
laboratory.
(iv) The double-wall piping system shall be installed
in accordance with the requirements in §334.46(f)(3) of this
title.
(B) External liners. External piping trench liners
may be used to comply with the secondary containment requirements
of this paragraph, provided that such liners meet the additional provisions
in paragraph (3)(B) of this subsection.
(e) Technical standards for other new UST system equipment.
(1) Vent lines. All underground portions of the vent
lines (including all associated underground valves, fittings, and
connectors) shall be designed and constructed in accordance with the
piping requirements in subsection (c)(1) of this section, shall be
properly protected from corrosion in accordance with one of the allowable
methods in §334.49 of this title, and shall be installed in accordance
with a code or standard of practice developed by a nationally recognized
association or independent testing laboratory.
(2) Fill pipes. All fill pipes (including any connected
fittings) shall be:
(A) designed and constructed in accordance with the
piping requirements in subsection (c)(1) of this section;
(B) properly protected from corrosion in accordance
with one of the allowable methods in §334.49 of this title;
(C) properly enclosed in or equipped with spill and
overfill prevention equipment as required in §334.51(b) of this
title; and
(D) equipped with a removable or permanent factory-constructed
drop tube which shall extend to within 12 inches of the tank bottom.
(3) Release detection equipment. All release detection
equipment shall be designed and constructed in accordance with the
requirements for the particular type of equipment, as described in
the applicable provisions in §334.50 of this title.
(4) Monitoring wells and observation wells.
(A) All monitoring wells and observation wells installed
on or after September 29, 1989, shall be designed, constructed, and
installed in accordance with the requirements in §334.46(g) of
this title.
(B) Each separate tank hole in a new UST system installed
on or after September 29, 1989, shall include a minimum number of
four-inch diameter (nominal) observation wells, as specified in the
following clauses:
(i) for a tank hole containing only one tank, a minimum
of one observation well shall be required; and
(ii) for a tank hole containing two or more tanks,
a minimum of two observation wells shall be required.
(f) Records for technical standards for new UST systems.
Owners and operators of new UST systems shall maintain adequate records
to demonstrate compliance with the applicable provisions in this section,
which at a minimum, shall include all records required in §334.46(i)
of this title. All records shall be maintained in accordance with §334.10(b)
of this title (relating to Reporting and Recordkeeping).
|
| Source Note: The provisions of this §334.45 adopted to be effective September 29, 1989, 14 TexReg 4714; amended to be effective November 23, 2000, 25 TexReg 11442; amended to be effective April 2, 2002, 27 TexReg 2522; amended to be effective October 30, 2008, 33 TexReg 8790; amended to be effective March 17, 2011, 36 TexReg 1675; amended to be effective May 31, 2018, 43 TexReg 3390 |
