| (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.
(H) All monitoring wells and observation wells shall
be properly capped, labeled, and secured (or locked) to prevent unauthorized
access, tampering, and any deliberate or accidental depositing of
unauthorized substances.
(2) Additional requirements for monitoring wells. In
addition to the general requirements of paragraph (1) of this subsection,
all monitoring wells installed in conjunction with a UST system shall
be constructed or installed in accordance with the applicable requirements
of 16 TAC Chapter 76 (relating to Water Well Drillers and Water Well
Pump Installers), and Texas Occupations Code, Chapter 1901 (relating
to Water Well Drillers). Any person constructing or installing a monitoring
well shall be appropriately licensed as required therein.
(3) Additional requirements for observation wells.
In addition to the general requirements of paragraph (1) of this subsection,
the following requirements shall be applicable to all observation
wells installed in conjunction with a UST system.
(A) All observation wells that are regulated as monitoring
wells by the Texas Department of Licensing and Regulation (TDLR) shall
be constructed or installed in accordance with the applicable requirements
in 16 TAC Chapter 76, and Texas Occupations Code, Chapter 1901. Any
person constructing or installing such well shall be appropriately
licensed as required therein.
(B) All observation wells that are not regulated as
monitoring wells by the TDLR shall be constructed or installed in
accordance with the following minimum requirements.
(i) All observation wells shall be designed and installed
in general accordance with a code or standard of practice developed
by a nationally recognized association or independent testing laboratory.
(ii) All observation wells shall be constructed or
installed within the UST system excavation zone, and shall be completed
to a depth of at least two feet below the lowest part of any monitored
tank, or at least one foot below the lowest part of any monitored
piping, as applicable.
(iii) For observation wells installed or constructed
on or after September 29, 1989, in a new or existing UST system where
the backfill consists of specialized or select materials (i.e., sand,
pea gravel, or crushed rock), the following minimum requirements shall
be applicable.
(I) The access vault or manhole shall be properly installed
in a concrete encasement which shall extend from the top of the vault
to at least one foot below the base of the vault to provide adequate
structural support and to prevent surface runoff and pollutants from
entering the well.
(II) Beginning at the bottom of the concrete encasement
beneath the access vault, the well casing shall be properly sealed
with impervious bentonite or a similar impervious material for a minimum
distance of either one foot below the bottom of the concrete encasement
or to the top of the specialized or select backfill material, whichever
is the greater depth.
(iv) For observation wells installed or constructed
on or after September 29, 1989, in an existing UST system where the
backfill consists of materials other than specialized or select materials
(e.g., native soils), the well shall be constructed or installed in
accordance with the applicable standards in 16 TAC Chapter 76. If
the observation well is not regulated as a monitoring well by the
TDLR, the licensing requirements for persons constructing or installing
such well shall not be applicable.
(h) Certification of installation.
(1) All owners and operators of new UST systems installed
on or after September 29, 1989, shall ensure that the installation
was completed in accordance with the provisions of this section, and
that the UST system installation is conducted by an installer licensed
by the agency.
(2) The installer of the UST system shall complete
the installation certification section of the agency's authorized
form, and shall certify by signature that the installation methods
are in compliance with the provisions of this section, as required
by §334.8(a) of this title (relating to Certification for Underground
Storage Tanks (USTs) and UST Systems).
(i) Installation records.
(1) Owners and operators shall maintain all installation
records required in accordance with the requirements in §334.10(b)
of this title (relating to Reporting and Recordkeeping).
(2) Owners and operators shall maintain the following
records for the operational life of the UST system:
(A) general information relating to the installation
activity, including:
(i) date of installation activity;
(ii) names, addresses, and telephone numbers of the
persons conducting the installation and performing any associated
inspections or testing; and
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