| (ii) If the qualified corrosion specialist determines
that the UST system component is no longer adequately protected from
corrosion, then the owner or operator shall assure that one or more
of the following procedures are completed before the UST system is
placed into operation.
(I) Appropriate repairs or modifications shall be made
to restore the cathodic corrosion protection to the applicable UST
system components.
(II) The cathodic protection system shall be replaced
with another operable cathodic protection system which will provide
adequate corrosion protection to the applicable UST system components,
in accordance with the requirements in §334.49(c)(2) of this
title (relating to Corrosion Protection).
(e) Installation of cathodic protection systems. The
installation of any field-installed cathodic protection system in
a new or existing UST system shall be in accordance with the applicable
requirements of §334.49(c)(2) of this title.
(f) Installation of secondary containment systems.
(1) Secondary containment. Any secondary containment
system shall meet the technical standards of §334.45(d) of this
title (relating to Technical Standards for New Underground Storage
Tank Systems).
(2) Installation of double-wall tanks.
(A) The installation of double-wall tanks shall be
in compliance with the manufacturer's specifications and the applicable
tank installation procedures in this section.
(B) Air testing for double-wall tanks shall be in accordance
with the manufacturer's specifications or the following procedures.
(i) The primary tank shall be pressurized and gauged
with three to five psig of air pressure. The primary tank shall be
pressurized for at least one hour, and the gauge pressure shall be
periodically monitored for any pressure drops.
(ii) After disconnecting the outside air pressure source,
the interstitial area between the tank walls shall be pressurized
with air pressure from the primary tank. A second gauge shall be used
to measure the pressure in the interstitial space.
(iii) The exterior of the tank shall be soaped, and
the integrity of the system shall be inspected by monitoring the gauges
and inspecting for air bubbles for at least one hour prior to releasing
the pressure.
(iv) Gauges used in air testing procedures shall have
a maximum range not exceeding 15 psig. All tanks undergoing air testing
shall be equipped with a pressure relief device capable of relieving
the total output of the compressed air source at a pressure of not
more than six psig.
(3) Installation of double-wall piping.
(A) The installation of double-wall piping shall be
in compliance with the manufacturer's specifications and the applicable
piping installation procedures in this section.
(B) After successful air testing of the completed primary
piping system (in accordance with subsection (d)(2) of this section),
the secondary containment piping shall be air tested in accordance
with the manufacturer's specifications and the following procedures.
(i) The secondary containment piping shall be pressurized
and gauged with three to five psig of air pressure.
(ii) The exterior of the secondary containment piping
shall be soaped and the integrity of the system shall be inspected
by monitoring for air bubbles for at least one hour.
(iii) The secondary containment piping system shall
remain pressurized, and the gauges shall be periodically monitored
for pressure losses, until the entire UST system installation is complete
in order to monitor for damages during the remaining construction
activities.
(4) Installation of external liners.
(A) External liners shall be installed in accordance
with the manufacturer's specifications, and in accordance with the
requirements in this paragraph.
(B) The installation, field-seaming, and field-repair
of any liners shall be performed only by qualified personnel who have
been properly trained and certified by the liner manufacturer.
(C) The liner shall be protected from puncture, abrasion,
or any other damage during placement and during installation of other
UST system components. A protective layer of puncture-resistant filter
fabric shall be required when the liner is placed in an excavation
area where the presence of sharp paving, rocks, or other debris presents
a threat to the liner integrity.
(D) The liner shall be installed in a manner that will
allow sufficient enclosure of the secondarily protected component
to prevent lateral and vertical migration of any collected regulated
substances.
(E) For UST systems which are equipped with cathodic
protection equipment, the liner shall be installed so as not to jeopardize
or inhibit the proper operation of such cathodic protection equipment.
(F) The liner installation shall include the provision
of an appropriate number of recessed collection/detection points,
and all portions of the liner shall be sloped toward such points to
permit the detection of any releases from the primary storage component.
(G) The installation of the liner shall be performed
in a manner that will ensure that groundwater, soil moisture, and
stormwater runoff will not adversely affect the liner's ability to
collect and contain regulated substances or the ability of the selected
release detection methods to operate effectively.
(H) The liner shall be designed and installed to ensure
that it will always be situated above the highest groundwater level
and outside the 25-year floodplain, unless the liner and the release
detection system are properly designed for use under such conditions.
The owner or operator may be required to provide documentation of
the methods used to determine groundwater and floodplain information.
(I) After completion of the liner installation, but
prior to placing the UST system into service, the liner shall be properly
tested in accordance with the manufacturer's specifications.
(g) Installation of monitoring wells and observation
wells. All monitoring wells and observation wells installed in conjunction
with a UST system on or after September 29, 1989, shall be constructed
and installed in accordance with the requirements of this subsection.
(1) General requirements for both monitoring wells
and observation wells.
(A) All monitoring wells and observation wells shall
be constructed or installed by personnel possessing the appropriate
skills, experience, competence, and, if applicable, any required license
or certification to complete the construction or installation in accordance
with recognized industry standards and the requirements of this subsection.
(B) Except for observation wells installed under §334.45(e)(4)(B)
of this title, the determination of the appropriate number and the
appropriate diameters of monitoring wells or observation wells shall
be based on the planned purpose of such well and on the specific procedures,
methods, and equipment to be utilized in achieving such purpose.
(C) The slotted or screened portion of the monitoring
well or observation well casing shall be designed and sized so as
to prevent the migration of natural soils, backfill material, or filter
pack material into the well, and to allow the unrestricted entry of
any released regulated substances (liquid-phase or vapor-phase, as
applicable) into the well at all times, regardless of the groundwater
levels.
(D) The well casing material shall be sufficiently
compatible with the stored regulated substance such that prolonged
exposure to such substances will not cause failure or excessive deterioration
of the casing.
(E) When installed or constructed for the purposes
of compliance with one or more of the release detection methods in §334.50(d)
of this title, the specific number and positioning of the monitoring
wells and/or observation wells shall be based on the results of an
assessment of the underground areas within and immediately surrounding
the UST system excavation zone to assure compliance with the specific
criteria and requirements for the applicable release detection method.
Such assessment shall be performed by qualified personnel who are
familiar with the characteristics of the stored regulated substance
and the groundwater, soil, and geologic conditions at the site.
(F) All monitoring wells and observation wells shall
be equipped with a properly designed and properly installed bottom
cap.
(G) All monitoring well and observation well installations
shall include an appropriate access vault or manhole, which shall
be equipped with a liquid-tight cover and be designed to divert surface
runoff away from the well.
Cont'd... |
