| (95) Radioactive waste--Any waste which contains radioactive
material in concentrations which exceed those listed in 10 Code of
Federal Regulations Part 20, Appendix B, Table II, Column 2, and as
amended.
(96) Recharge injection well--A Class V injection well
used for the injection of water into a geologic formation for an aquifer
recharge project, including an improved sinkhole or cave connected
to an aquifer.
(97) Registered Well--A well registered in accordance
with the requirements of §331.221 of this title (relating to
Registration of Wells).
(98) Restoration demonstration--A test or tests conducted
by a permittee to simulate production and restoration conditions and
verify or modify the fluid handling values submitted in the permit
application.
(99) Restored aquifer--An aquifer whose local groundwater
quality, within a production area, has, by natural or artificial processes,
returned to the restoration table values established in accordance
with the requirements of §331.107 of this title (relating to
Restoration).
(100) Salt cavern--A hollowed-out void space that has
been purposefully constructed within a salt formation, typically by
means of solution mining by circulation of water from a well or wells
connected to the surface.
(101) Salt cavern disposal well--For the purposes of
this chapter, regulations of the commission, and not to underground
injection control (UIC) Class II or UIC Class III wells in salt caverns
regulated by the Railroad Commission of Texas, a salt cavern disposal
well is a type of UIC Class I injection well used:
(A) to solution mine a waste storage or disposal cavern
in naturally occurring salt; and/or
(B) to inject nonhazardous, industrial, or municipal
waste into a salt cavern for the purpose of storage or disposal of
the waste.
(102) Salt dome--A geologic structure that includes
the caprock, salt stock, and deformed strata surrounding the salt
stock.
(103) Salt dome cavern confining zone--A zone between
the salt dome cavern injection zone and all underground sources of
drinking water and freshwater aquifers, that acts as a barrier to
movement of waste out of a salt dome cavern injection zone, and consists
of the entirety of the salt stock excluding any portion of the salt
stock designated as an underground injection control (UIC) Class I
salt dome cavern injection zone or any portion of the salt stock occupied
by a UIC Class II or Class III salt dome cavern or its disturbed salt
zone.
(104) Salt dome cavern injection interval--That part
of a salt dome cavern injection zone consisting of the void space
of the salt dome cavern into which waste is stored or disposed of,
or which is capable of receiving waste for storage or disposal.
(105) Salt dome cavern injection zone--The void space
of a salt dome cavern that receives waste through a well, plus that
portion of the salt stock enveloping the salt dome cavern, and extending
from the boundaries of the cavern void outward a sufficient thickness
to contain the disturbed salt zone, and an additional thickness of
undisturbed salt sufficient to ensure that adequate separation exists
between the outer limits of the injection zone and any other activities
in the domal area.
(106) Salt stock--A geologic formation consisting of
a relatively homogeneous mixture of evaporite minerals dominated by
halite (NaCl) that has migrated from originally tabular beds into
a vertical orientation.
(107) Sanitary waste--Liquid or solid waste originating
solely from humans and human activities, such as wastes collected
from toilets, showers, wash basins, sinks used for cleaning domestic
areas, sinks used for food preparation, clothes washing operations,
and sinks or washing machines where food and beverage serving dishes,
glasses, and utensils are cleaned.
(108) Septic system--A well that is used to emplace
sanitary waste below the surface, and is typically composed of a septic
tank and subsurface fluid distribution system or disposal system.
(109) Stratum--A sedimentary bed or layer, regardless
of thickness, that consists of generally the same kind of rock or
material.
(110) Subsurface fluid distribution system--An assemblage
of perforated pipes, drain tiles, or other similar mechanisms intended
to distribute fluids below the surface of the ground. This definition
includes subsurface area drip dispersal systems as defined in §222.5
of this title (relating to Definitions).
(111) Surface casing--The first string of casing (after
the conductor casing, if any) that is set in a well.
(112) Temporary injection point--A method of Class
V injection that uses push point technology (injection probes pushed
into the ground) for the one-time injection of fluids into or above
an underground source of drinking water.
(113) Total dissolved solids--The total dissolved (filterable)
solids as determined by use of the method specified in 40 Code of
Federal Regulations Part 136, as amended.
(114) Transmissive fault or fracture--A fault or fracture
that has sufficient permeability and vertical extent to allow fluids
to move between formations.
(115) Underground injection--The subsurface emplacement
of fluids through a well.
(116) Underground injection control--The program under
the federal Safe Drinking Water Act, 42 United States Code, Part C,
including the approved Texas state program.
(117) Underground source of drinking water--An "aquifer"
or its portions:
(A) which supplies drinking water for human consumption;
or
(B) in which the groundwater contains fewer than 10,000
milligrams per liter total dissolved solids; and
(C) which is not an exempted aquifer.
(118) Upper limit--A parameter value established by
the commission in a permit/production area authorization which when
exceeded indicates mining solutions may be present in designated monitor
wells.
(119) Verifying analysis--A second sampling and analysis
or measurement with instrumentation of control parameters for the
purpose of confirming a routine sample analysis or measurement which
indicated an increase in any control parameter to a level exceeding
the upper limit. Mining solutions are assumed to be present in a designated
monitor well if a verifying analysis confirms that any control parameter
in a designated monitor well is present in concentration equal to
or greater than the upper limit value.
(120) Well--A bored, drilled, or driven shaft whose
depth is greater than the largest surface dimension, a dug hole whose
depth is greater than the largest surface dimension, an improved sinkhole,
or a subsurface fluid distribution system but does not include any
surface pit, surface excavation, or natural depression.
(121) Well injection--The subsurface emplacement of
fluids through a well.
(122) Well monitoring--The measurement by on-site instruments
or laboratory methods of any chemical, physical, radiological, or
biological property of the subsurface strata or their contained fluids
penetrated by the wellbore.
(123) Well stimulation--Several processes used to clean
the well bore, enlarge channels, and increase pore space in the injection
interval, thus making it possible for fluid to move more readily into
the formation including, but not limited to, surging, jetting, and
acidizing.
(124) Workover--An operation in which a down-hole component
of a well is repaired, the engineering design of the well is changed,
or the mechanical integrity of the well is compromised. Workovers
include operations such as sidetracking, the addition of perforations
within the permitted injection interval, and the addition of liners
or patches. For the purposes of this chapter, workovers do not include
well stimulation operations.
|
| Source Note: The provisions of this §331.2 adopted to be effective May 13, 1986, 11 TexReg 1980; amended to be effective July 5, 1989, 14 TexReg 3047; amended to be effective June 22, 1992, 17 TexReg 4097; amended to be effective January 2, 1995, 19 TexReg 10099; amended to be effective June 28, 1996, 21 TexReg 5443; amended to be effective April 28, 1997, 22 TexReg 3526; amended to be effective November 23, 2000, 25 TexReg 11433; amended to be effective July 12, 2001, 26 TexReg 5019; amended to be effective January 9, 2003, 28 TexReg 340; amended to be effective October 2, 2003, 28 TexReg 8367; amended to be effective September 16, 2004, 29 TexReg 8824;amended to be effective July 5, 2006, 31 TexReg 5339; amended to be effective July 10, 2008, 33 TexReg 5342; amended to be effective March 12, 2009, 34 TexReg 1638; amended to be effective August 16, 2012, 37 TexReg 6078; amended to be effective May 19, 2016, 41 TexReg 3513; amended to be effective May 28, 2020, 45 TexReg 3458 |
