PURPOSE: This rule defines specific words used in this chapter.

1. (1) Many definitions relevant to this rule are set forth in the underground storage tank

2. (UST) law in section 319.100, RSMo.

   1. (A) Definitions beginning with the letter A.

      1. 1. “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 a UST system and aboveground releases associated with overfills and transfer operations as the regulated substance moves to or from a UST system.

1. 2. “Airport hydrant fuel distribution sys-

tem” (also called airport hydrant system) means a UST system which fuels aircraft and operates under high pressure that typically terminates into one (1) or more hydrants (fill stands). The airport hydrant system begins where fuel enters one (1) or more tanks from an external source such as a pipeline, barge, rail car, or other motor fuel carrier.

1. 3. “Annual” means recurring, done, or

performed every three hundred sixty-five (365) days.

1. 4. “Annually” means at least once every

three hundred sixty-five (365) days.

1. (B) Definitions beginning with the letter B.

   1. 1. “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 a UST system and belowground releases associated with overfills and transfer operations as the regulated substances move to or from a UST.

1. 2. “Beneath the surface of the ground”

means beneath the ground surface or otherwise covered with earthen materials.

1. 3. “Biannually” or “biannual” means

recurring, done, or performed every six (6) months.

1. (C) Definitions beginning with the letter C.

   1. 1. “Cathodic protection” is a technique

to prevent corrosion of a metal surface by making that surface the cathode of an electrochemical cell. For example, a tank system can be cathodically protected through the application of either galvanic anodes or impressed current.

1. 2. “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 persons must be certified by NACE International, the Steel Tank Institute, or the International Code Council.

1. 3. “CERCLA” means the Comprehensive

Environmental Response, Compensation, and Liability Act of 1980, as amended by the Superfund Amendments and Reauthorization Act of 1986.

1. 4. “Compatible” means the ability of

two (2) or more substances to maintain their respective physical and chemical properties upon contact with one another for the design life of the tank system under conditions likely to be encountered in the UST.

1. 5. “Consumptive use” with respect to

heating oil means consumed on the premises for heating purposes, typically in the operation of heating equipment, boilers, and furnaces.

1. 6. “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.

1. 7. “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. Such a person must be certified by NACE International as a CP Technologist, CP Specialist, Senior Corrosion Technologist, or for sti-P3 tanks, a Steel Tank Institute certified Cathodic Protection Inspector.

1. (D) Definitions beginning with the letter D.

   1. 1. “De minimus” means—

      1. A. Any volume of regulated sub-

stance(s) contained in a tank with a capacity of less than one hundred ten (110) gallons; or

1. B. A very low concentration of regu-

lated substances; or

1. C. Any volume of regulated sub-

stance(s) contained in an emergency backup tank that holds regulated substances for only a short period of time and is expeditiously emptied after use. (Comment: De minimus tanks include: swimming pools, permitted wastewater treatment facilities, and chlorinated, potable water storage tanks. An oil-water separator is not a de minimus system unless the tank has a less than one hundred ten (110) gallon capacity.)

1. 2. “Department,” unless otherwise stat-

ed, means the Missouri Department of Natural Resources.

1. 3. “Dielectric material” means a materi-

al that does not conduct direct electrical current. Dielectric coatings are used to electrically isolate UST systems from the surrounding soils. Dielectric bushings are used to electrically isolate portions of the UST system (e.g., tank from piping).

1. 4. “Dispenser” means equipment locat-

ed above the surface of the ground that dispenses regulated substances from the UST system.

1. 5. “Dispenser system” means the dis-

penser and the equipment necessary to connect the dispenser to the underground portions of the piping system.

1. 6. “Double-walled piping” is a pipe

within a pipe, where the outer wall and inner walls are separated, the inner pipe is completely contained within the outer pipe, except for any single wall fittings or ends, which must be open to a leak-tight containment sump, and the space between the two (2) pipes can be used to monitor the integrity of both the inner and outer pipes.

1. 7. “Double-walled tank” means a tank

within a tank, where the inner tank is contained within the outer tank to a minimum of ninety-five percent (95%) containment, and the outer wall and inner walls have an interstitial space capable of being monitored for a leak from either tank. Substance Storage Tanks

1. (E) Definitions beginning with the letter E.

   1. 1. “Electrical equipment” means under-

ground equipment that contains dielectric fluid that is necessary for the operation of equipment such as transformers and buried electrical cable.

1. 2. “Excavation zone” means the volume

containing the tank system and backfill material 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.

1. (F) Definitions beginning with the letter F.

   1. 1. “Farm tank” is a tank 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 must be located on the farm property. Farm includes fish hatcheries, rangeland, and nurseries with growing operations.

1. 2. “Field-constructed tank” means an

underground tank constructed in the field or location where it will be used to store a regulated substance. For example, a tank constructed of concrete that is poured on-site or a steel erected tank. This does not include field modifications to a factory-built tank.

1. 3. “Flow-through process tank” is 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. Flow-through process tanks do not include tanks used for the storage of materials prior to their introduction into the production process or for the storage of finished products or by-products from the production process.

1. 4. “Free product” refers to a regulated

substance that is present as a non-aqueous phase liquid (e.g., liquid not dissolved in water).

1. (G) Definitions beginning with the letter G.

   1. 1. “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.

1. (H) Definitions beginning with the letter H.

   1. 1. “Hazardous substance UST system”

means a UST system that contains a hazardous substance defined in Section 101(14) of the CERCLA (but not including any substance regulated as a hazardous waste under the Missouri Hazardous Waste Management Law, sections 260.350–260.434, RSMo) or any mixture of these substances and petroleum, and which is not a petroleum storage tank.

1. 2. “Heating oil” means petroleum that is

No. 1, No. 2, No. 4—light, No. 4—heavy, No. 5—light, No. 5—heavy, and 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 (1) of these fuel oils. Heating oil is typically used in the operation of heating equipment, boilers, or furnaces.

1. 3. “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.

1. (I) Definitions beginning with the letter I.

   1. 1. The term “in-operation” means input

or output that occurs on a regular basis for the tank’s intended purpose.

1. 2. The terms “in-service” and “in-use”

are equivalent and mean that the tank system contains more than one inch (1") of a regulated substance or residue or three-tenths percent (0.3%) by weight of the total capacity of the UST system of regulated substance. A tank is considered to be in-service and in-use beginning with the first input of a regulated substance into the tank system.

1. 3. The term “installer” means any per-

son, partnership, corporation, company, business, firm, society, or association that installs part or all of an underground storage tank system.

1. (J) Definitions beginning with the letter J. (Reserved).
2. (K) Definitions beginning with the letter

1. K. (Reserved).

   1. (L) Definitions beginning with the letter L.

      1. 1. “Liquid trap” means sumps, well cel-

lars, 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.

1. (M) Definitions beginning with the letter M.

   1. 1. “Maintenance” means the normal

operational upkeep to prevent an underground storage tank system from releasing regulated substances.

1. 2. “Month,” unless otherwise stated,

means thirty (30) days.

1. 3. “Monthly” means at least once every

thirty (30) days.

1. 4. “Motor fuel” means a complex blend

of hydrocarbons typically used in the operation of a motor engine, such as motor gasoline, aviation gasoline, No. 1 or No. 2 diesel fuel, or any blend containing one (1) or more of these substances (for example: motor gasoline blended with alcohol).

1. (N) Definitions beginning with the letter N.

   1. 1. “Noncommercial purposes” with

respect to motor fuel means not for resale.

1. (O) Definitions beginning with the letter O.

   1. 1. “On the premises where stored,” with

respect to heating oil, means UST systems located on the same property where the stored heating oil is used.

1. 2. “Operational life” refers to the period

beginning when installation of the tank system has commenced until the time the tank system is properly closed under 10 CSR 26- 2.060–10 CSR 26-2.064.

1. 3. “Operator” means any person in con-

trol of, or having responsibility for, the daily operation of a tank.

1. 4. The terms “out-of-service” and “out-

of-use” are equivalent and mean that the tank system has been emptied so that no more than one inch (1") of regulated substance or residue or three-tenths percent (0.3%) by weight of the total capacity of the UST system remains.

1. 5. “Overfill release” is a release that

occurs when a tank is filled beyond its capacity, resulting in the discharge of the regulated substance to the environment.

1. 6. “Owner” means any person who

owned an underground storage tank immediately before the discontinuation of its use if not in use on August 28, 1989, or any person who owns an underground storage tank in use on August 28, 1989, excluding persons who hold indicia of ownership primarily to protect a security interest or lienholders exempted under section 319.100(9), RSMo.

1. (P) Definitions beginning with the letter P.

   1. 1. “Person” means any individual, trust,

firm, joint stock company, corporation, including a government corporation, partnership, association, the state and its political subdivisions, or any interstate body. “Person” also includes any consortium, joint venture, commercial entity, and the government of the United States.

1. 2. “Petroleum” means gasoline,

kerosene, diesel, lubricants, and fuel oil. This definition includes motor fuels, aviation gas, jet fuels, distillate fuel oils, residual fuel oils, and petroleum solvents.

1. 3. “Petroleum storage tank,” as it per-

tains to the authority in this chapter, means an underground storage tank system used to contain an accumulation of petroleum.

1. 4. “Pipe or piping” means a hollow

cylinder or tubular conduit that is constructed of non-earthen materials.

1. 5. “Pipeline facilities” (including gath-

ering lines) are new and existing pipe rightsof-way and any associated equipment, facilities, or buildings.

1. (Q) Definitions beginning with the letter 10 CSR 26-2

1. Q. (Reserved).

   1. (R) Definitions beginning with the letter R.

      1. 1. “Regulated substance” includes:

         1. A. Any substance defined in Section

101(14) of the federal Comprehensive Environmental Response, Compensation, and Liability Act (P.L. 96-510), as amended, but not including a substance regulated as a hazardous waste under Subtitle C of the federal Resource Conservation and Recovery Act of 1976 (P.L. 94-580), as amended; and

1. B. Petroleum, including crude oil or

any fraction thereof, which is liquid at standard conditions of temperature and pressure, sixty degrees (60˚) Fahrenheit and fourteen and seven-tenths (14 7/10) pounds per square inch absolute, respectively; and

1. C. Any substance adopted by rule in

accordance with federal laws referenced by Section 101(14) of the federal Comprehensive Environmental Response, Compensation, and Liability Act (P.L. 96-510).

1. 2. “Release” includes, but is not limited

to, any spilling, leaking, emitting, discharging, escaping, leaching, or disposing from a petroleum storage tank into groundwater, surface water, or subsurface soils.

1. 3. “Release detection” means determin-

ing 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.

1. 4. “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 a release of product from the UST system or has failed to function properly.

1. 5. “Replaced” or “replacement” means—

   1. A. For a tank - to remove a tank and

install another tank;

1. B. For piping - to remove fifty percent

(50%) or more of piping and install other piping, excluding connectors, connected to a single tank or single compartment. For tanks with multiple piping runs, this definition applies independently to each piping run.

1. 6. “Residential tank” is a tank located

on property used primarily for dwelling purposes.

1. 7. “Routinely contains regulated sub-

stance” means that a regulated substance regularly passes through the piping, but does not necessarily mean that the piping must continuously hold a regulated substance. Satellite lines, gravity piping, and remote fill lines, including lines from aboveground storage tank(s) to underground storage tank(s), all routinely contain a regulated substance. Vapor lines, including vent lines and vapor recovery lines, are not included.

1. (S) Definitions beginning with the letter S.

   1. 1. “SARA” means the Superfund

Amendments and Reauthorization Act of 1986.

1. 2. “Secondary containment” or

“Secondarily contained” means a release prevention and release detection system for a tank and/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.

1. 3. “Septic tank” means any watertight,

covered receptacle designed and constructed to receive the discharge of sewage, separate solids from liquid, digest organic matter, store liquids through a period of detention, and allow the clarified liquids to discharge to a soil treatment system.

1. 4. “Storm-water or wastewater collec-

tion system” means piping, pumps, conduits, and any other equipment necessary to collect and transport the flow of 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 storm water and wastewater does not include treatment except where incidental to conveyance.

1. 5. “Surface impoundment” is a natural

topographic depression, man-made excavation, or diked area formed primarily of earthen materials (although it may be lined with man-made materials) that is not an injection well.

1. (T) Definitions beginning with the letter T.

   1. 1. “Tank” is a stationary device designed

to contain an accumulation of regulated substances and constructed of non-earthen materials (e.g., concrete, steel, plastic) that provide structural support.

1. 2. “Triennial” means recurring, done,

or performed every one thousand ninety-five (1,095) days.

1. 3. “Triennially” means at least once

every one thousand ninety-five (1,095) days.

1. (U) Definitions beginning with the letter U.

   1. 1. “Under-dispenser containment” or

“UDC” means a containment sump underneath a dispenser system designed to prevent dispenser system leaks from reaching soil or groundwater.

1. 2. “Underground area” means an under-

ground room, such as a basement, cellar, shaft, or vault, providing enough space for physical inspection of the exterior of the tank situated on or above the surface of the floor.

1. 3. “Underground release” means any

belowground release.

1. 4. “Underground storage tank” is

defined in section 319.100, RSMo and means any one (1) or combination of tanks, including pipes connected thereto, used to contain an accumulation of regulated substances, and the volume of which, including the volume of the underground pipes connected thereto, is ten percent (10%) or more beneath the surface of the ground, except as exempted in section 319.100(16), RSMo.

1. 5. “Upgrade,” means the addition or

retrofit of some systems, such as cathodic protection, lining, or spill and overfill controls to improve the ability of an underground storage tank system to prevent the release of regulated substance.

1. (V) Definitions beginning with the letter V. (Reserved).

2. (W) Definitions beginning with the letter W.

   1. 1. “Wastewater treatment tank” means a

tank that is designed to receive and treat an influent wastewater through physical, chemical, or biological methods.

1. (X) Definitions beginning with the letter

1. X. (Reserved).

   1. (Y) Definitions beginning with the letter Y. (Reserved).
   2. (Z) Definitions beginning with the letter Z. (Reserved).

AUTHORITY: sections 319.100, 319.105, 319.107, 319.109, 319.111, 319.114, and 319.137, RSMo 2016.* This rule originally filed as 10 CSR 20-10.012. Original rule filed April 2, 1990, effective Sept. 28, 1990. Amended: Filed Dec. 31, 1991, effective Aug. 6, 1992. Amended: Filed Jan. 2, 1996, effective Aug. 30, 1996. Amended: Filed Jan. 14, 1997, effective Sept. 30, 1997. Amended: Filed April 1, 1999, effective March 30, 2000. Moved and amended: Filed April 15, 2011, effective Dec. 30, 2011. Amended: Filed Aug. 15, 2016, effective May 30, 2017. *Original authority: 319.100, RSMo 1989, amended 1991, 1993, 1996, 1998; 319.105, RSMo 1989; 319.107, RSMo 1989, amended 1994; 319.109, RSMo 1989, amended 1995, 2004, 2008; 319.111, RSMo 1989; 319.114, RSMo 1989, amended 2016; and 319.137, RSMo 1989, amended 1993, 1995, 2004.