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RULE §331.2Definitions

  (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.

  (75) New waste stream--A waste stream not permitted.

  (76) Non-commercial facility--A Class I permitted facility which operates only non-commercial wells.

  (77) Non-commercial underground injection control (UIC) Class I well facility--A UIC Class I permitted facility where only non-commercial wells are operated.

  (78) Non-commercial well--An underground injection control Class I injection well which disposes of wastes that are generated on-site, at a captured facility or from other facilities owned or effectively controlled by the same person.

  (79) Notice of change (NOC)--A written submittal to the executive director from a permittee authorized under a general permit providing changes to information previously provided to the agency, or any changes with respect to the nature or operations of the facility, or the characteristics of the waste to be injected.

  (80) Notice of intent (NOI)--A written submittal to the executive director requesting coverage under the terms of a general permit.

  (81) Off-site--Property which cannot be characterized as on-site.

  (82) On-site--The same or geographically contiguous property which may be divided by public or private rights-of-way, provided the entrance and exit between the properties is at a cross-roads intersection, and access is by crossing, as opposed to going along, the right-of-way. Noncontiguous properties owned by the same person but connected by a right-of-way which the owner controls and to which the public does not have access, is also considered on-site property.

  (83) Out of service--The operational status when a well is not authorized to inject fluids, or the well itself is incapable of injecting fluids for mechanical reasons, maintenance operations, or well workovers or when injection is prohibited due to the well's inability to comply with the in-service operating standards of this chapter.

  (84) Permit area--The area owned or under lease by the permittee which may include buffer areas, mine areas, and production areas.

  (85) Plugging--The act or process of stopping the flow of water, oil, or gas into or out of a formation through a borehole or well penetrating that formation.

  (86) Point of injection--For a Class V well, the last accessible sampling point prior to fluids being released into the subsurface environment.

  (87) Pollution--The contamination of water or the alteration of the physical, chemical, or biological quality of water:

    (A) that makes it harmful, detrimental, or injurious:

      (i) to humans, animal life, vegetation, or property; or

      (ii) to public health, safety, or welfare; or

    (B) that impairs the usefulness or the public enjoyment of the water for any lawful and reasonable purpose.

  (88) Pre-injection units--The on-site above-ground appurtenances, structures, equipment, and other fixtures including the injection pumps, filters, tanks, surface impoundments, and piping for wastewater transmission between any such facilities and the well that are or will be used for storage or processing of waste to be injected, or in conjunction with an injection operation.

  (89) Production area--The area defined by a line generally through the outer perimeter of injection and recovery wells used for mining.

  (90) Production area authorization--An authorization, issued under the terms of a Class III injection well area permit, approving the initiation of mining activities in a specified production area within a permit area, and setting specific conditions for production and restoration in each production area within an area permit.

  (91) Production well--A well used to recover uranium through in situ solution recovery, including an injection well used to recover uranium. The term does not include a well used to inject waste.

  (92) Production zone--The stratigraphic interval extending vertically from the shallowest to the deepest stratum into which mining solutions are authorized to be introduced.

  (93) Project operator--A person holding an authorization by rule, individual permit, or general permit to undertake an aquifer storage and recovery project or an aquifer recharge project.

  (94) Public water system--A system for the provision to the public of water for human consumption through pipes or other constructed conveyances as defined in §290.38 of this title (relating to Definitions).

  (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).


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