| (107) Standard conditions of temperature and pressure--A
temperature of 60 degrees Fahrenheit and an atmospheric pressure of
14.7 pounds per square inch absolute.
(108) Steel Tank Institute (STI)--A nationally recognized
organization which provides certifications and standards for steel
tanks.
(109) Stormwater or wastewater collection system--The
piping, pumps, conduits, and any other equipment necessary to collect
and transport surface water runoff resulting from precipitation, or
domestic, commercial, or industrial wastewater to and from retention
areas or any areas where treatment is designated to occur. The collection
of stormwater and wastewater does not include treatment except where
incidental to conveyance.
(110) Suction piping--Product or delivery piping in
an underground storage tank system which typically operates below
atmospheric pressure.
(111) Sump--Any man-made pit or reservoir that meets
the definition of a tank in this section (including any connected
troughs or trenches) that serves to collect and temporarily store
regulated substances.
(112) Surface impoundment--A natural topographic depression,
man-made excavation, or diked area formed primarily of earthen materials
(but possibly lined with man-made materials) that is designed to hold
an accumulation of regulated substances.
(113) Tank--A stationary device (generally exclusive
of any associated ancillary equipment) designed or used to contain
an accumulation of regulated substances which is constructed of a
non-earthen material (e.g., concrete, steel, or plastic) that provides
structural support.
(114) Tank hole--The portion of the excavation zone
at an underground storage tank facility which contains the tanks and
associated backfill materials.
(115) Tank system--An underground storage tank system.
(116) Temporary removal from service--The procedure
by which an underground storage tank system may be temporarily taken
out of operation without being permanently removed from service.
(117) Tightness test (or tightness testing)--A procedure
for testing and analyzing a tank or piping system to determine whether
the system(s) is capable of preventing the inadvertent release of
a stored substance into the environment.
(118) Under-dispenser containment (UDC)--Containment
underneath a dispenser system designed to prevent leaks from the dispenser
and piping within or above the UDC from reaching soil or groundwater.
(119) Underground area--An underground room, basement,
cellar, shaft, or vault, which provides enough space for physical
inspection of the exterior of a tank or tank system situated on or
above the surface of the floor.
(120) Underground storage tank (UST)--Any one or combination
of underground tanks and any connecting underground pipes used to
contain an accumulation of regulated substances, the volume of which,
including the volume of the connecting underground pipes, is 10% or
more beneath the surface of the ground.
(121) Underground storage tank (UST) system--An underground
storage tank, all associated underground piping and underground ancillary
equipment, spill and overfill prevention equipment, release detection
equipment, corrosion protection system, secondary containment equipment
(as applicable), and all other related systems and equipment.
(122) Underwriters Laboratories, Inc. (UL)--A nationally
recognized organization which provides certifications and standards
for consumer products and services.
(123) Unsaturated zone--The subsurface zone containing
water under pressure less than that of the atmosphere (including water
held by capillary forces within the soil) and containing air or gases
generally under atmospheric pressure. This zone is bounded at the
top by the ground surface and at the bottom by the upper surface of
the zone of saturation (i.e., the water table).
(124) Upgrading--The addition, improvement, retrofitting,
or renovation of an existing underground storage tank system with
equipment or components as required to meet the corrosion protection,
spill and overfill prevention, and release detection requirements
of this chapter.
(125) Used oil--Any oil that has been refined from
crude oil, or any synthetic oil, that has been used and as a result
of such use is contaminated by physical or chemical impurities.
(126) Vent lines--All pipes including valves, elbows,
joints, flanges, flexible connectors, and other fittings attached
to a tank system, which are intended to convey the vapors emitted
from a regulated substance stored in an underground storage tank to
the atmosphere.
(127) Wastewater treatment tank--A tank that is designed
to receive and treat an influent wastewater through physical, chemical,
or biological methods.
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| Source Note: The provisions of this §334.2 adopted to be effective September 29, 1989, 14 TexReg 4714; amended to be effective June 25, 1990, 15 TexReg 3424; amended to be effective August 15, 1994, 19 TexReg 5843; amended to be effective November 8, 1995, 20 TexReg 8800; amended to be effective November 23, 2000, 25 TexReg 11442; amended to be effective April 2, 2002, 27 TexReg 2522; amended to be effective November 18, 2004, 29 TexReg 10532; amended to be effective November 9, 2006, 31 TexReg 9034; amended to be effective October 30, 2008, 33 TexReg 8790; amended to be effective May 31, 2018, 43 TexReg 3390 |
