| (36) Desalination brine--The waste stream produced
by a desalination operation containing concentrated salt water, other
naturally occurring impurities, and additives used in the operation
and maintenance of a desalination operation.
(37) Desalination concentrate--Same as desalination
brine.
(38) Desalination operation--A process which produces
water of usable quality by desalination.
(39) Disposal well--A well that is used for the disposal
of waste into a subsurface stratum.
(40) Disturbed salt zone--Zone of salt enveloping a
salt dome cavern, typified by increased values of permeability or
other induced anomalous conditions relative to undisturbed salt which
lies more distant from the salt dome cavern, and is the result of
mining activities during salt dome cavern development and which may
vary in extent through all phases of a cavern including the post-closure
phase.
(41) Drilling mud--A heavy suspension used in drilling
an injection well, introduced down the drill pipe and through the
drill bit.
(42) Drinking water treatment residuals--Materials
generated, concentrated or produced as a result of treating water
for human consumption.
(43) Drywell--A well, other than an improved sinkhole
or subsurface fluid distribution system, completed above the water
table so that its bottom and sides are typically dry except when receiving
fluids.
(44) Enhanced oil recovery project (EOR)--The use of
any process for the displacement of oil from the reservoir other than
primary recovery and includes the use of an immiscible, miscible,
chemical, thermal, or biological process. This term does not include
pressure maintenance or water disposal projects.
(45) Excursion--The movement of mining solutions, as
determined by analysis for control parameters, into a designated monitor
well.
(46) Existing injection well--A Class I well which
was authorized by an approved state or United States Environmental
Protection Agency-administered program before August 25, 1988, or
a well which has become a Class I well as a result of a change in
the definition of the injected waste which would render the waste
hazardous under §335.1 of this title (relating to Definitions).
(47) Fluid--Material or substance which flows or moves
whether in a semisolid, liquid, sludge, gas, or any other form or
state.
(48) Formation--A body of rock characterized by a degree
of lithologic homogeneity which is prevailingly, but not necessarily,
tabular and is mappable on the earth's surface or traceable in the
subsurface.
(49) Formation fluid--Fluid present in a formation
under natural conditions.
(50) Fresh water--Water having bacteriological, physical,
and chemical properties which make it suitable and feasible for beneficial
use for any lawful purpose.
(A) For the purposes of this chapter, it will be presumed
that water is suitable and feasible for beneficial use for any lawful
purpose only if:
(i) it is used as drinking water for human consumption;
or
(ii) the groundwater contains fewer than 10,000 milligrams
per liter (mg/L) total dissolved solids; and
(iii) it is not an exempted aquifer.
(B) This presumption may be rebutted upon a showing
by the executive director or an affected person that water containing
greater than or equal to 10,000 mg/L total dissolved solids can be
put to a beneficial use.
(51) General permit--A permit issued under the provisions
of this chapter authorizing the disposal of nonhazardous desalination
concentrate and nonhazardous drinking water treatment residuals as
provided by Texas Water Code, §27.025.
(52) Groundwater--Water below the land surface in a
zone of saturation.
(53) Groundwater protection area--A geographic area
(delineated by the state under federal Safe Drinking Water Act, 42
United States Code, §300j-13) near and/or surrounding community
and non-transient, non-community water systems that use groundwater
as a source of drinking water.
(54) Hazardous waste--Hazardous waste as defined in §335.1
of this title (relating to Definitions).
(55) Improved sinkhole--A naturally occurring karst
depression or other natural crevice found in carbonate rocks, volcanic
terrain, and other geologic settings which has been modified by man
for the purpose of directing and emplacing fluids into the subsurface.
(56) Individual permit--A permit, as defined in the
Texas Water Code (TWC), §27.011 and §27.021, issued by the
commission or the executive director to a specific person or persons
in accordance with the procedures prescribed in the TWC, Chapter 27
(other than TWC, §27.025).
(57) Injection interval--That part of the injection
zone in which the well is authorized to be screened, perforated, or
in which the waste is otherwise authorized to be directly emplaced.
(58) Injection operations--The subsurface emplacement
of fluids occurring in connection with an injection well or wells,
other than that occurring solely for construction or initial testing.
(59) Injection well--A well into which fluids are being
injected. Components of an injection well annulus monitoring system
are considered to be a part of the injection well.
(60) Injection zone--A formation, a group of formations,
or part of a formation that receives fluid through a well.
(61) In service--The operational status when an authorized
injection well is capable of injecting fluids, including times when
the well is shut-in and on standby status.
(62) Intermediate casing--A string of casing with diameter
intermediate between that of the surface casing and that of the smaller
long-string or production casing, and which is set and cemented in
a well after installation of the surface casing and prior to installation
of the long-string or production casing.
(63) Large capacity cesspool--A cesspool that is designed
for a flow of greater than 5,000 gallons per day.
(64) Large capacity septic system--A septic system
that is designed for a flow of greater than 5,000 gallons per day.
(65) Licensed professional geoscientist--A geoscientist
who maintains a current license through the Texas Board of Professional
Geoscientists in accordance with its requirements for professional
practice.
(66) Liner--An additional casing string typically set
and cemented inside the long string casing and occasionally used to
extend from base of the long string casing to or through the injection
zone.
(67) Long string casing or production casing--A string
of casing that is set inside the surface casing and that usually extends
to or through the injection zone.
(68) Lost circulation zone--A term applicable to rotary
drilling of wells to indicate a subsurface zone which is penetrated
by a wellbore, and which is characterized by rock of high porosity
and permeability, into which drilling fluids flow from the wellbore
to the degree that the circulation of drilling fluids from the bit
back to ground surface is disrupted or "lost."
(69) Mine area--The area defined by a line through
the ring of designated monitor wells installed to monitor the production
zone.
(70) Mine plan--A plan for operations at a mine, consisting
of:
(A) a map of the permit area identifying the location
and extent of existing and proposed production areas; and
(B) an estimated schedule indicating the sequence and
timetable for mining and any required aquifer restoration.
(71) Monitor well--Any well used for the sampling or
measurement with field instrumentation of any chemical or physical
property of subsurface strata or their contained fluids. The term
"monitor well" shall have the same meaning as the term "monitoring
well" as defined in Texas Water Code, §27.002.
(A) Designated monitor wells are those listed in the
production area authorization for which routine water quality sampling
or measurement with field instrumentation is required.
(B) Secondary monitor wells are those wells in addition
to designated monitor wells, used to delineate the horizontal and
vertical extent of mining solutions.
(C) Pond monitor wells are wells used in the subsurface
surveillance system near ponds or other pre-injection units.
(72) Motor vehicle waste disposal well--A well used
for the disposal of fluids from vehicular repair or maintenance activities
including, but not limited to, repair and maintenance facilities for
cars, trucks, motorcycles, boats, railroad locomotives, and airplanes.
(73) Native groundwater--Groundwater naturally occurring
in a geologic formation.
(74) New injection well--Any well, or group of wells,
not an existing injection well.
Cont'd... |
