Arizona Administrative Code › Title 18 - ENVIRONMENTAL QUALITY › Chapter 12 - DEPARTMENT OF ENVIRONMENTAL QUALITY - UNDERGROUND STORAGE TANKS › Article 1 - DEFINITIONS; APPLICABILITY › Section R18-12-101 - Definitions

Current through Register Vol. 30, No. 28, July 12, 2024
In addition to the definitions prescribed in A.R.S.
				  §§
									49-1001
				  and
				  49-1001.01,
				  the following definitions apply in this Chapter:
"Aboveground release" means any release to the surface of the
				  land or to surface water. This includes, but is not limited to, releases from
				  the aboveground portion of an UST system and aboveground releases associated
				  with overfills and transfer operations as the regulated substance moves to or
				  from an UST system.
"Accidental release" means, with respect to Article 3 only,
				  any sudden or nonsudden release of petroleum arising from operating an UST
				  system that is neither expected nor intended by the UST system owner or
				  operator, that results in a need for one or more of the following:
Corrective action,
Compensation for bodily injury, or
Compensation for property damage.
"Airport hydrant fuel distribution system" or "airport
				  hydrant system" means a petroleum UST system which fuels aircraft and operates
				  under high pressure with large diameter piping that typically terminates into
				  one or more hydrants (fill stands). The airport hydrant system begins where
				  fuel enters one or more tanks from an external source such as a pipeline,
				  barge, rail car, or other motor fuel carrier.
"Ancillary equipment" means any device used to distribute,
				  dispense, meter, monitor, or control the flow of regulated substances to and
				  from an UST system.
"Annual" means, with respect to
				  R18-12-240
				  through
				  R18-12-245
				  only, a calendar period of 12 consecutive months.
"Aviation fuel," for the purpose of Article 4 only, has the
				  definition at A.R.S. §
									28-101.
"Belowground release" means any release to the subsurface of
				  the land or to groundwater. This includes, but is not limited to, releases from
				  the belowground portions of an underground storage tank system and belowground
				  releases associated with overfills and transfer operations as the regulated
				  substance moves to or from an underground storage tank.
"Bodily injury" means injury to the body, sickness, or
				  disease sustained by any person, including death resulting from any of these at
				  any time.
"CAP" means corrective action plan.
"Cathodic protection" means a technique to prevent corrosion
				  of a metal surface by making that surface the cathode of an electrochemical
				  cell.
"Cathodic protection tester" means a person who can
				  demonstrate an understanding of the principles and measurements of all common
				  types of cathodic protection systems as applied to buried or submerged metal
				  piping and tank systems. At a minimum, such a person shall have education and
				  experience in soil receptivity, stray current, structure-to-soil potential, and
				  component electrical isolation measurements of buried metal piping and tank
				  systems.
"CERCLA" means the federal Comprehensive Environmental
				  Response, Compensation, and Liability Act as defined in A.R.S. §
									49-201.
"CFR" means the Code of Federal Regulations, with standard
				  references in this Chapter by Title and Part, so that " 40 CFR 280 " means
				  Title 40 of the Code of Federal Regulations, Part 280.
"Change-in-service" means changing the use of an UST system
				  from the storage of a regulated substance to the storage of a non-regulated
				  substance.
"Chemical of concern" means any regulated substance detected
				  in contamination from the LUST site that is evaluated for potential impacts to
				  public health and the environment.
"Chief financial officer" means, with respect to local
				  government owners and operators, the individual with the overall authority and
				  responsibility for the collection, disbursement, and use of funds by the local
				  government.
"Class A operator" means the individual who has primary
				  responsibility to operate and maintain the UST system in accordance with
				  applicable requirements established by this Chapter and Arizona Revised
				  Statutes, title 49, chapter 6. The Class A operator typically manages resources
				  and personnel, such as establishing work assignments, to achieve and maintain
				  compliance with regulatory requirements.
"Class B operator" means the individual who has day-to-day
				  responsibility for implementing applicable regulatory requirements established
				  by this Chapter and Arizona Revised Statutes, title 49, chapter 6. The Class B
				  operator typically implements in-field aspects of operation, maintenance, and
				  associated recordkeeping for the UST system.
"Class C operator" means the individual responsible for
				  initially addressing emergencies presented by a spill or release from an UST
				  system. The Class C operator typically controls or monitors the dispensing or
				  sale of regulated substances.
"Clean Water Act" has the definition at A.R.S. §
									49-201.
"Compatible" means the ability of two or more substances to
				  maintain their respective physical and chemical properties upon contact with
				  one another under conditions likely to be encountered in the UST during the
				  operational life of the UST system.
"Conceptual site model" means a written and visual
				  representation of the complete current and potential exposure pathways, based
				  on existing and reasonably anticipated future use.
"Connected piping" means all underground piping including
				  valves, elbows, joints, flanges, and flexible connectors that are attached to a
				  tank system and through which regulated substances flow. For the purpose of
				  determining how much piping is connected to an individual UST system, the
				  piping that joins multiple tanks shall be divided equally between the
				  tanks.
"Consultant" means a person who performs environmental
				  services in an advisory, investigative, or remedial capacity.
"Containment sump" means a liquid-tight container that
				  protects the environment by containing leaks and spills of regulated substances
				  from piping, dispensers, pumps and related components in the containment area.
				  Containment sumps may be single walled or secondarily contained and located at
				  the top of tank (tank top or submersible turbine pump sump), underneath the
				  dispenser (under-dispenser containment sump), or at other points in the piping
				  run (transition or intermediate sump).
"Contamination" means the analytically determined existence
				  of a regulated substance within environmental media outside the confines of an
				  UST system, which originated from the UST system.
"Contractor" means a person who is required to obtain and
				  hold a valid license from the Arizona Registrar of Contractors which permits
				  bidding and performance of removal, excavation, repair, or construction
				  services associated with an UST system.
"Controlling interest" means direct ownership of at least 50
				  percent of a firm, through voting stock, or otherwise.
"Corrective action services" means any service that is
				  provided to fulfill the statutory requirements of A.R.S. §
									49-1005 and the
				  rules made under §
									49-1005.
"Corrective action standard" means the concentration of the
				  chemical of concern in the medium of concern that is protective of public
				  health and welfare and the environment based on either pre-established
				  non-site-specific assumptions or site-specific data, including any applied
				  environmental use restriction.
"Corrosion expert" means a person who, by reason of thorough
				  knowledge of the physical sciences and the principles of engineering and
				  mathematics acquired by a professional education and related practical
				  experience, is qualified to engage in the practice of corrosion control on
				  buried or submerged metal piping systems and metal tanks. The person shall be
				  accredited or certified as being qualified by the National Association of
				  Corrosion Engineers or be a registered professional engineer who has
				  certification or licensing that includes education and experience in corrosion
				  control of buried or submerged metal piping systems and metal tanks.
"Current assets" means assets which can be converted to cash
				  within one year and are available to finance current operations or to pay
				  current liabilities.
"Current liabilities" means those liabilities which are
				  payable within one year.
"Decommissioning" means, with respect to Article 8 only,
				  activities described in
				  R18-12-271(D)(1)
				  through
				  R18-12-271(D)(4).
"De minimis" means that quantity of regulated substance which
				  is described by one of the following:
When mixed with another regulated substance, is of such low
				  concentration that the toxicity, detectability, or corrective action
				  requirements of the mixture are the same as for the host substance.
When mixed with a non-regulated substance, is of such low
				  concentration that a release of the mixture does not pose a threat to public
				  health or the environment greater than that of the host substance.
"Department" means the Arizona Department of Environmental
				  Quality.
"Derived waste" means any excavated soil, soil cuttings, and
				  other soil waste; fluids from well drilling, aquifer testing, well purging,
				  sampling, and other fluid wastes; or disposable decontamination, sampling, or
				  personal protection equipment generated as a result of release confirmation,
				  LUST site investigation, or other corrective action activities.
"Dielectric material" means a material that does not conduct
				  electrical current and that is used to electrically isolate UST systems or UST
				  system parts from surrounding soils or portions of UST systems from each
				  other.
"Diesel" means, with respect to Article 4 only, a liquid
				  petroleum product that meets the specifications in American Society for Testing
				  and Materials Standard D975-18, "Standard Specification for Diesel Fuel
				  Oils".
"Director" means the Director of the Arizona Department of
				  Environmental Quality.
"Dispenser" means equipment located aboveground that
				  dispenses regulated substances from the UST system.
"Dispenser system" means the dispenser and the equipment
				  necessary to connect the dispenser to the underground storage tank
				  system.
"Electrical equipment" means underground equipment that
				  contains dielectric fluid that is necessary for the operation of equipment such
				  as transformers and buried electrical cable.
"Emergency power generator" means a power generator which is
				  used only when the primary source of power is interrupted. The interruption of
				  the primary source of power shall not be due to any action or failure to take
				  any action by the owner or operator of either the emergency generator or of the
				  UST system which stores fuel for the emergency generator.
"Engineering Control" for soil, surface water and groundwater
				  contamination has the definition at
				  R18-7-201.
"Excavation zone" means the volume that contains or contained
				  the tank system and backfill material and is bounded by the ground surface,
				  walls, and floor of the pit and trenches into which the UST system is placed at
				  the time of installation.
"Excess lifetime cancer risk level" for soil, surface water,
				  and groundwater contamination, has the definition at
				  R18-7-201.
"Existing tank system" means a tank system used to contain an
				  accumulation of regulated substances on or before December 22, 1988, or for
				  which installation has commenced on or before December 22, 1988.
"Exposure" for soil, surface water, and groundwater
				  contamination, has the meaning defined in
				  R18-7-201.
"Exposure assessment" means the qualitative or quantitative
				  determination or estimation of the magnitude, frequency, duration, and route of
				  exposure or potential for exposure of a receptor to chemicals of concern from a
				  release.
"Exposure pathway" for soil, surface water, and groundwater
				  contamination, has the meaning defined in
				  R18-7-201.
"Exposure route" for soil, surface water, and groundwater
				  contamination, has the definition at
				  R18-7-201.
"Facility" means a single parcel of property and any
				  contiguous or adjacent property on which one or more UST systems are
				  located.
"Facility identification number" means the unique number
				  assigned to a facility by the Department either after the initial notification
				  requirements of A.R.S. §
									49-1002
				  are satisfied, or after a refund claim is submitted and approved under
				  R18-12-409.
"Facility location," for the purpose of Article 4 only, means
				  the street address or a description of the location of a storage
				  facility.
"Facility name" means the business or operational name
				  associated with a storage facility.
"Farm tank" means a tank system located on a tract of land
				  devoted to the production of crops or raising animals, including fish, and
				  associated residences and improvements. A farm tank shall be located on the
				  farm property. The term "farm" includes fish hatcheries, rangeland, and
				  nurseries with growing operations.
"Field-constructed tank" means a tank constructed in the
				  field. For example, a tank constructed of concrete that is poured in the field,
				  or a steel or fiberglass tank primarily fabricated in the field is considered
				  field-constructed.
"Financial reporting year" means the latest consecutive
				  12-month period, either fiscal or calendar, for which financial statements used
				  to support the financial test of self-insurance under
				  R18-12-305
				  are prepared, including the following, if applicable:
A 10-K report submitted to the Securities and Exchange
				  Commission.
An annual report of tangible net worth submitted to Dun and
				  Bradstreet.
Annual reports submitted to the Energy Information
				  Administration or the Rural Utilities Service.
"Firm" means any for-profit entity, nonprofit or
				  not-for-profit entity, or local government. An individual doing business as a
				  sole proprietor is a firm for purposes of this Chapter.
"Flow-through process tank" means a tank that forms an
				  integral part of a production process through which there is a steady,
				  variable, recurring, or intermittent flow of materials during the operation of
				  the process. The term "flow-through process tank" does not include a tank used
				  for the storage of materials prior to their introduction into the production
				  process or for the storage of finished products or byproducts from the
				  production process.
"Free product" means a mobile regulated substance that is
				  present as a nonaqueous phase liquid (e.g. liquid not dissolved in
				  water).
"Gathering lines" means any pipeline, equipment, facility, or
				  building used in the transportation of oil or gas during oil or gas production
				  or gathering operations.
"Groundwater" means water in an aquifer as defined at A.R.S.
				  §
									49-201.
"Hazard Index" for soil, surface water, and groundwater
				  contamination, has the definition at
				  R18-7-201.
"Hazard quotient" for soil, surface water, and groundwater
				  contamination, has the definition at
				  R18-7-201.
"Hazardous substance UST system" means an UST system that
				  contains a hazardous substance as defined in A.R.S. §
									49-1001 or
				  any mixture of such substance and petroleum, which is not a petroleum UST
				  system.
"Heating oil" means petroleum that is No. 1, No. 2, No.
				  4-light, No. 4-heavy, No. 5-light, No. 5-heavy, or No. 6 technical grades of
				  fuel oil; other residual fuel oils (including Navy Special Fuel Oil and Bunker
				  C); and other fuels when used as substitutes for one of these fuel oils for
				  heating purposes.
"Hydraulic lift tank" means a tank holding hydraulic fluid
				  for a closed-loop mechanical system that uses compressed air or hydraulic fluid
				  to operate lifts, elevators, and other similar devices.
"ICC" means the International Code Council.
"Implementing agency" means, with respect to Article 3 only,
				  the Arizona Department of Environmental Quality for UST systems subject to the
				  jurisdiction of the state of Arizona, or the EPA for other jurisdictions or, in
				  the case of a state with a program approved under
				  42 U.S.C.
				  6991 (or pursuant to a memorandum of
				  agreement with EPA), the designated state or local agency responsible for
				  carrying out an approved UST program.
"Indian country" means, under
				  18 U.S.C.
				  1151, all of the following:
All land within the limits of an Indian reservation under the
				  jurisdiction of the United States government which is also located within the
				  borders of this state, notwithstanding the issuance of any patent, and
				  including rights-of-way running through the reservation.
All dependent Indian communities within the borders of the
				  state whether within the original or subsequently acquired territory of the
				  state.
All Indian allotments, the Indian titles to which have not
				  been extinguished, including rights-of-way running through such
				  allotments.
"Induration" means the consolidation of a rock or rock
				  material by the action of heat, pressure, or the introduction of some cementing
				  material not commonly contained in the original mass. Induration also means the
				  hardening of a soil horizon by chemical action to form hardpan
				  (caliche).
"Installation" means the placement and preparation for
				  placement of any UST system or UST system part into an excavation zone.
				  Installation is considered to have commenced if both of the following
				  exist:
The owner and operator has obtained all federal, state, and
				  local approvals or permits necessary to begin physical construction of the site
				  or installation of the UST system.
The owner and operator has begun a continuous on-site
				  physical construction or installation program or has entered into contractual
				  obligations, which cannot be canceled or modified without substantial loss, for
				  physical construction at the site or installation of the UST system to be
				  completed within a reasonable time.
"Institutional control" for soil, surface water, and
				  groundwater contamination, has the definition at
				  R18-7-201.
"Legal defense cost" means, with respect to Article 3 only,
				  any expense that an owner or operator, or provider of financial assurance
				  incurs in defending against claims or actions brought under any of the
				  following circumstances:
By EPA or a state to require corrective action or to recover
				  the costs of corrective action;
By or on behalf of a 3rd party for
				  bodily injury or property damage caused by an accidental release; or
By any person to enforce the terms of a financial assurance
				  mechanism.
"Liquid trap" means sumps, well cellars, and other traps used
				  in association with oil and gas production, gathering, and extraction
				  operations (including gas production plants), for the purpose of collecting
				  oil, water, and other liquids. These liquid traps may temporarily collect
				  liquids for subsequent disposition or reinjection into a production or pipeline
				  stream, or may collect and separate liquids from a gas stream.
"Local government" means a county, city, town, school
				  district, water and aqueduct management district, irrigation district, power
				  district, electrical district, agricultural improvement district, drainage and
				  flood control district, tax levying public improvement district, local
				  government public transportation system, and any political subdivision defined
				  in A.R.S. §
									49-1001.
"LUST" means leaking UST, or one that has leaked.
"LUST case" means all of the documentation related to a
				  specific LUST number, which is maintained on file by the Department.
"LUST number" means the unique number assigned to a release
				  by the Department after the notification requirements of A.R.S. §
									49-1004(A)
				   are met.
"LUST site" means the UST facility from which a release has
				  occurred.
"Maintenance" means those actions necessary to ensure the
				  proper working condition of an UST system or equipment used in corrective
				  actions.
"Motor vehicle fuel," for the purpose of Article 4 only, has
				  the definition at A.R.S. §
									28-101.
"Natural attenuation" means a reduction in mass or
				  concentration of a chemical of concern in groundwater over time or distance
				  from the release point due to naturally occurring physical, chemical, and
				  biological processes, such as: biodegradation, dispersion, dilution, sorption,
				  and volatilization.
"Nature of the regulated substance" means the chemical and
				  physical properties of the regulated substance stored in the UST, and any
				  changes to the chemical and physical properties upon or after release.
"Nature of the release" means the known or estimated means by
				  which the contents of the UST was dispersed from the UST system into the
				  surrounding media, and the conditions of the UST system and media at the time
				  of release.
"New tank system" means a tank system that will be used to
				  contain an accumulation of regulated substances and for which installation has
				  commenced after December 22, 1988.
"On-site control" means, for the purpose of Article 8 only,
				  being at the location where tank service is being performed while tank service
				  is performed.
"On the premises where stored" means, with respect to A.R.S.
				  §
									49-1001(18)(b)
				   only, a single parcel of property or any
				  contiguous or adjacent parcels of property.
"Operational life" means the period beginning when
				  installation of the tank system has begun and ending when the tank system is
				  properly closed under
				  R18-12-271
				  through
				  R18-12-274.
"Overfill release" means a release that occurs when a tank is
				  filled beyond its capacity, resulting in a discharge of a regulated substance
				  to the environment.
"Owner identification number" means the unique number
				  assigned to the owner of an UST by the Department after the initial
				  notification requirements of A.R.S. §
									49-1002
				  are satisfied, or after a refund claim is submitted and approved pursuant to
				  R18-12-409.
"Petroleum marketing facility" means a facility at which
				  petroleum is produced or refined and all facilities from which petroleum is
				  sold or transferred to other petroleum marketers or to the public.
"Petroleum UST system" means an UST system that contains or
				  contained petroleum or a mixture of petroleum with de minimis quantities of
				  other regulated substances. These systems include those containing motor fuels,
				  jet fuels, distillate fuel oils, residual fuel oils, lubricants, petroleum
				  solvents, and used oils.
"Pipe" or "Piping" means a hollow cylinder or tubular conduit
				  that is constructed of non-earthen materials.
"Pipeline facility" means new or existing pipe rights-of-way
				  and any associated equipment, gathering lines, facilities, or buildings.
"Point of compliance" means the geographic location at which
				  the concentration of the chemical of concern is to be at or below the
				  risk-based corrective action standard determined to be protective of public
				  health and the environment.
"Point of exposure" for soil, surface water, and groundwater
				  contamination, has the definition at
				  R18-7-201
				  for "exposure point."
"Property damage" means physical injury to, destruction of,
				  or contamination of tangible property, including all resulting loss of use of
				  that property; or loss of use of tangible property that is not physically
				  injured, destroyed, or contaminated, but has been evacuated, withdrawn from
				  use, or rendered inaccessible.
"Provider of financial assurance" means an entity that
				  provides financial assurance to an owner or operator of an UST through one of
				  the mechanisms listed in
				  R18-12-305
				  through
				  R18-12-317,
				  including a guarantor, insurer, risk retention group, surety, or issuer of a
				  letter of credit.
"RCRA" means the Resource Conservation and Recovery
				  Act.
"Receptor" means persons, enclosed structures, subsurface
				  utilities, waters of the state, or water supply wells and wellhead protection
				  areas.
"Release confirmation" means free product discovery, or
				  reported laboratory analytical results of samples collected and analyzed in
				  accordance with the sampling requirements of
				  R18-12-280
				  and A.A.C. Title 9, Chapter 14, Article 6 which indicate a release of a
				  regulated substance from the UST system.
"Release confirmation date" means the date that an owner or
				  operator first confirms the release, or the date that the owner or operator is
				  informed of a release confirmation made by another person.
"Release detection" means determining whether a release of a
				  regulated substance has occurred from the UST system into the environment or a
				  leak has occurred into the interstitial space between the UST system and its
				  secondary barrier or secondary containment around it.
"Remediation" for soil, surface water, and groundwater
				  contamination, has the definition at A.R.S. §
									49-151.
"Repair" means to restore to proper operating condition a
				  tank pipe, spill prevention equipment, overfill prevention equipment, corrosion
				  protection equipment, release detection equipment or other UST system component
				  that has caused or may cause a release of regulated substance from the UST
				  system or has failed to function properly.
"Replaced" means:
(a) For a tank - to remove a tank and install another
				  tank.
(b) For piping - removing and replacing any piping component.
"Residential tank" means an UST system located on property
				  used primarily for dwelling purposes.
"Retrofit" means to add to an UST system, equipment or parts
				  that were not originally included or installed as part of the UST
				  system.
"Risk characterization" means the qualitative and
				  quantitative determination of combined risks to receptors from individual
				  chemicals of concern and exposure pathways, and the associated
				  uncertainties.
"Routinely contains product" or "routinely contains regulated
				  substance" means the part of an UST system which is designed to contain
				  regulated substances and includes all internal areas of the tank and all
				  internal areas of the piping, excluding only the vent piping.
"SARA" means the Superfund Amendments and Reauthorization Act
				  of 1986, P.L. 99-499.
"Secondary containment" or "Secondarily contained" means a
				  release prevention and release detection system for a tank or piping. This
				  system has an inner and outer barrier with an interstitial space that is
				  monitored for leaks. This term includes containment sumps when used for
				  interstitial monitoring of piping.
"Septic tank" means a water-tight covered receptacle designed
				  to receive or process, through liquid separation or biological digestion, the
				  sewage discharged from a building sewer. The effluent from such receptacle is
				  distributed for disposal through the soil and settled solids and scum from the
				  tank are pumped out periodically and hauled to a treatment facility.
"Site location map" means a representation by means of signs
				  and symbols on a planar surface, at an established scale, of the streets,
				  wells, and general use of the land for properties within at least one-quarter
				  mile of the facility boundaries, with the direction of orientation
				  indicated.
"Site plan" means a representation by means of signs and
				  symbols on a planar surface, at an established scale, of the physical features
				  (natural, artificial, or both) of the facility and surrounding area necessary
				  to meet the requirements under which the site plan is prepared, with the
				  direction of orientation indicated.
"Site vicinity map" means a representation by means of signs
				  and symbols on a planar surface, at an established scale, of the natural and
				  artificial physical features, used in the exposure assessment, that occur
				  within at least 500 feet of the facility boundaries, with the direction of
				  orientation indicated.
"Solid Waste Disposal Act" for the purposes of this Chapter
				  means the "federal act" as defined by A.R.S. §
									49-921.
"Source area" means either the location of the release from
				  an UST, the location of free product, the location of the highest soil and
				  groundwater concentration of chemicals of concern, or the location of a soil
				  concentration of chemicals of concern which may continue to impact groundwater
				  or surface water.
"Source of contamination" means with respect to this Chapter,
				  the conditions described in A.R.S. §
									49-1053(J).
"Spill" means the loss of regulated substance during the
				  transfer of a regulated substance to an UST system.
"Storage facility" means, for the purpose of Article 4 only,
				  the common, identifiable, location at which deliveries of regulated substances
				  are made to an UST, an above ground storage tank, or to a group of underground
				  and above ground storage tanks, and to which the Department has assigned a
				  single facility identification number.
"Storm-water or wastewater collection system" means piping,
				  pumps, conduits, and any other equipment necessary to collect and transport the
				  flow of surface water run-off resulting from precipitation, or of domestic,
				  commercial, or industrial wastewater to and from retention areas or any areas
				  where treatment is designated to occur. The collection of storm water and
				  wastewater does not include treatment except where incidental to
				  conveyance.
"Substantial business relationship" means the extent of a
				  business relationship necessary under Arizona law to make a guarantee contract
				  issued incident to that relationship valid and enforceable. A guarantee
				  contract is issued "incident to that relationship" if it arises from and
				  depends on existing economic transactions between the guarantor and the owner
				  or operator.
"Substantial governmental relationship" means the extent of a
				  governmental relationship necessary under Arizona law to make an added
				  guarantee contract issued incident to that relationship valid and enforceable.
				  A guarantee contract under
				  R18-12-316
				  is issued "incident to that relationship" if it arises from a clear commonality
				  of interest in the event of an UST release such as coterminous boundaries,
				  overlapping constituencies, common groundwater aquifer, or other relationship
				  other than monetary compensation that provides a motivation for the guarantor
				  to provide a guarantee.
"Supplier" means, for the purpose of Article 4 only, with
				  respect to collection of the UST excise tax, a person who is described by
				  either A.R.S. §
									28-6001(A)
				  or (B). The term "supplier" includes a
				  distributor, as defined in A.R.S. §
									28-5601,
				  who is required to be licensed by A.R.S. Title 28, Chapter 16, Article
				  1.
"Supplier identification number" means, for the purpose of
				  Article 4 only, the unique number assigned to the supplier by the Department of
				  Transportation for the purpose of administering the motor vehicle fuel tax
				  under A.R.S. Title 28, Chapter 16, Article 1.
"Surface impoundment" means a natural topographic depression,
				  artificial excavation, or diked area formed primarily of earthen materials, but
				  which may be lined with artificial materials, that is not an injection
				  well.
"Surface water" has the definition at
				  R18-11-101.
"Surficial soil" means any soil occurring between the current
				  surface elevation and extending to that depth for which reasonably foreseeable
				  construction activities may excavate and relocate soils to surface elevation,
				  and any stockpiles generated from soils of any depth.
"Suspected release discovery date" means the day an owner or
				  operator first has reason to believe, through direct discovery or being
				  informed by another person, that a suspected release exists.
"Suspected release notification date" means the day the
				  Department informs an owner or operator, as evidenced by the return receipt,
				  that a UST may be the source of a release.
"Tangible net worth" means, for purposes of R18-12-101 and
				  R18-12-305,
				  the tangible assets that remain after deducting liabilities; such assets do not
				  include intangibles such as goodwill and rights to patents or royalties. For
				  purposes of this definition, "assets" means all existing and all probable
				  future economic benefits obtained or controlled by a particular entity as a
				  result of past transactions.
"Tax" means, for the purpose of Article 4 only, the excise
				  tax on the operation of USTs levied by A.R.S. Title 49, Chapter 6, Article 2.
				  "Taxpayer" means, for the purpose of Article 4 only, the owner or operator of
				  an UST who pays the tax.
"Training program" means any program that provides
				  information to and evaluates the knowledge of a Class A, Class B, or Class C
				  operator through testing, practical demonstration, or another approach
				  acceptable to the Department regarding requirements for UST systems that meets
				  the requirements of A.R.S.§
									49-1083
				  and this Chapter.
"Under-dispenser containment" or "UDC" means containment
				  underneath a dispenser system designed to prevent leaks from the dispenser and
				  piping within or above the UDC from reaching soil or groundwater.
"Underground area" means an underground room, such as a
				  basement, cellar, shaft, or vault that provides enough space for physical
				  inspection of the exterior of the tank, situated on or above the surface of the
				  floor.
"Underground storage tank" has the definition at A.R.S.
				  §
									49-1001.
"Upgrade" means the addition to or retrofit of an UST system
				  or UST system parts, under
				  R18-12-221,
				  to improve the ability to prevent release of a regulated substance.
"UST" means an underground storage tank as defined at A.R.S.
				  §
									49-1001.
"UST regulatory program" means the program established by and
				  described in A.R.S. Title 49, Chapter 6 and the rules promulgated under that
				  program.
"UST system" or "tank system" means an UST, connected
				  underground piping, impact valve and connected underground ancillary equipment
				  and containment system, if any.
"Vadose zone" has the definition at A.R.S. §
									49-201.
"Volatile regulated substance" means any regulated substance
				  that generally has the following chemical characteristics: a vapor pressure of
				  greater than 0.5 mmHg at 20°C, a Henry's Law Constant of greater than 1 x
				  10-5 atm m3/mol, and
				  which has a boiling point of less than 250° - 300°C.
"Wastewater treatment tank" means a tank system that is
				  designed to receive and treat an influent wastewater through physical,
				  chemical, or biological methods.