Ariz. Admin. Code § R18-2-301 - Definitions

The following definitions apply to this Article:

1. "Alternative method" means any method of sampling and analyzing for an air pollutant which is not a reference or equivalent method but which has been demonstrated to produce results adequate for the Director's determination of compliance in accordance with R18-2-311(D).

2. "Billable permit action" means the issuance or denial of a new permit, significant permit revision, or minor permit revision, or the renewal of an existing permit.

3. "Capacity factor" means the ratio of the average load on a machine or equipment for the period of time considered to the capacity rating of the machine or equipment.

4. "CEM" means a continuous emission monitoring system as defined in R18-2-101.

5. "Complete" means, in reference to an application for a permit, permit revision or registration, that the application contains all the information necessary for processing the application. Designating an application complete for purposes of a permit, permit revisions or registration processing does not preclude the Director from requesting or accepting any additional information.

6. "Dispersion technique" means any technique which attempts to affect the concentration of a pollutant in the ambient air by any of the following:

a. Using that portion of a stack which exceeds good engineering practice stack height;

b. Varying the rate of emission of a pollutant according to atmospheric conditions or ambient concentrations of that pollutant; or

c. Increasing final exhaust gas plume rise by manipulating source process parameters, exhaust gas parameters, stack parameters, or combining exhaust gases from several existing stacks into one stack; or other selective handling of exhaust gas streams so as to increase the exhaust gas plume rise. This shall not include any of the following:

i. The reheating of a gas stream, following use of a pollution control system, for the purpose of returning the gas to the temperature at which it was originally discharged from the facility generating the gas stream.

ii. The merging of exhaust gas streams under any of the following conditions:

(1) The source owner or operator demonstrates that the facility was originally designed and constructed with such merged gas streams;

(2) After July 8, 1985, such merging is part of a change in operation at the facility that includes the installation of pollution controls and is accompanied by a net reduction in the allowable emissions of a pollutant, applying only to the emission limitation for that pollutant; or

(3) Before July 8, 1985, such merging was part of a change in operation at the facility that included the installation of emissions control equipment or was carried out for sound economic or engineering reasons. Where there was an increase in the emission limitation or, in the event that no emission limitation was in existence prior to the merging, an increase in the quantity of pollutants actually emitted prior to the merging, the reviewing agency shall presume that merging was significantly motivated by an intent to gain emissions credit for greater dispersion. Absent a demonstration by the source owner or operator that merging was not significantly motivated by such intent, the reviewing agency shall deny credit for the effects of such merging in calculating the allowable emissions for the source.

iii. Smoke management in agricultural or silvicultural prescribed burning programs.

iv. Episodic restrictions on residential woodburning and open burning.

v. Techniques which increase final exhaust gas plume rise where the resulting allowable emissions of sulfur dioxide from the facility do not exceed 5,000 tons per year.

7. "Emissions allowable under the permit" means a permit term or condition determined at issuance to be required by an applicable requirement that establishes an emissions limit (including a work practice standard) or an emissions cap that the source has assumed to avoid an applicable requirement to which the source would otherwise be subject.

8. "Fossil fuel-fired steam generator" means a furnace or boiler used in the process of burning fossil fuel for the primary purpose of producing steam by heat transfer.

9. "Fuel oil" means Number 2 through Number 6 fuel oils as specified in ASTM D-396-90a (Specification for Fuel Oils), gas turbine fuel oils Numbers 2-GT through 4-GT as specified in ASTM D-2880-90a (Specification for Gas Turbine Fuel Oils), or diesel fuel oils Numbers 2-D and 4-D as specified in ASTM D-975-90a (Specification for Diesel Fuel Oils).

10. "Itemized bill" means a breakdown of the permit processing time into the categories of pre-application activities, completeness review, substantive review, and public involvement activities, and within each category, a further breakdown by employee name.

11. "Major source threshold" means the lowest applicable emissions rate for a pollutant that would cause the source to be a major source at the particular time and location, under the definition of major source in R18-2-101.

12. "Maximum capacity to emit" means the maximum amount a source is capable of emitting under its physical and operational design without taking any limitations on operations or air pollution controls into account.

13. "Maximum capacity to emit with any elective limits" means the maximum amount a source is capable of emitting under its physical and operational design taking into account the effect on emissions of any elective limits included in the source's registration under R18-2-302.01(F) .

12 14. "Minor NSR Modification" means any of the following changes that do not qualify as a major source or major modification:

a. Any physical change in or change in the method of operation of an emission unit or a stationary source that either:

i. Increases the potential to emit of a regulated minor NSR pollutant by an amount greater than or equal to the permitting exemption thresholds, or

ii. Results in emissions of a regulated minor NSR pollutant not previously emitted by such emission unit or stationary source in an amount greater than or equal to the permitting exemption thresholds.

b. Construction of one or more new emissions units that have the potential to emit regulated minor NSR pollutants at an amount greater than or equal to the permitting exemption threshold.

c. A change covered by subsection (12)(a) or (b) of this Section constitutes a minor NSR modification regardless of whether there will be a net decrease in total source emissions or a net increase in total source emissions that is less than the permitting exemption threshold as a result of decreases in the potential to emit of other emission units at the same stationary source.

d. For the purposes of this subsection (the) following do not constitute a physical change or change in the method of operation:

i. A change consisting solely of the construction of, or changes to, a combination of emissions units qualifying as a categorically exempt activity.

ii. For a stationary source that is required to obtain a Class II permit under R18-2-302 and that is subject to source-wide emissions caps under R18-2-306.01 or R18-2-306.02, a change that will not result in the violation of the existing emissions cap for that regulated minor NSR pollutant.

iii. Replacement of an emission unit by a unit with a potential to emit regulated minor NSR pollutants that is less than or equal to the potential to emit of the existing unit, provided the replacement does not cause an increase in emissions at other emission units at the stationary source. A unit installed under this provision is subject to any limits applicable to the unit it replaced.

iv. Routine maintenance, repair, and replacement.

v. Use of an alternative fuel or raw material by reason of an order under Sections 2(a) and (b) of the Energy Supply and Environmental Coordination Act of 1974, 15 U.S.C. 792, or by reason of a natural gas curtailment plan under the Federal Power Act, 16 U.S.C. 792 to 825r.

vi. Use of an alternative fuel by reason of an order or rule under Section 125 of the Act.

vii. Use of an alternative fuel at a steam generating unit to the extent that the fuel is generated from municipal solid waste.

viii. Use of an alternative fuel or raw material by a stationary source that either:

(1) The source was capable of accommodating before December 12, 1976, unless the change would be prohibited under any federally enforceable permit condition established after December 12, 1976, under 40 CFR 52.21, or under Articles 3 or 4 of this Chapter; or

(2) The source is approved to use under any permit issued under 40 CFR 52.21, or under Articles 3 or 4 of this Chapter.

ix. An increase in the hours of operation or in the production rate, unless the change would be prohibited under any federally enforceable permit condition established after December 12, 1976, under 40 CFR 52.21, or under Articles 3 or 4 of this Chapter.

x. Any change in ownership at a stationary source

xi. The installation, operation, cessation, or removal of a temporary clean coal technology demonstration project, if the project complies with:

(1) The SIP, and

(2) Other requirements necessary to attain and maintain the national ambient air quality standards during the project and after it is terminated.

xii. For electric utility steam generating units located in attainment and unclassifiable areas only, the installation or operation of a permanent clean coal technology demonstration project that constitutes repowering, if the project does not result in an increase in the potential to emit any regulated pollutant emitted by the unit. This exemption applies on a pollutant-by-pollutant basis.

xiii. For electric utility steam generating units located in attainment and unclassifiable areas only, the reactivation of a very clean coal-fired electric utility steam generating unit.

e. For purposes of this subsection:

i. "Potential to emit" means the lower of a source's or emission unit's potential to emit or its allowable emissions.

ii. In determining potential to emit, the fugitive emissions of a stationary source shall not be considered unless the source belongs to a section 302(j) category.

iii. All of the roadways located at a stationary source constitute a single emissions unit.

13 15. "NAICS" means the five- or six-digit North American Industry Classification System-United States, 1997, number for industries used by the U.S. Department of Commerce.

14 16. "Permit processing time" means all time spent by Air Quality Division staff or consultants on tasks specifically related to the processing of an application for the issuance or renewal of a particular permit or permit revision, including time spent processing an application that is denied.

15 17. "Quantifiable" means, with respect to emissions, including the emissions involved in equivalent emission limits and emission trades, capable of being measured or otherwise determined in terms of quantity and assessed in terms of character. Quantification may be based on emission factors, stack tests, monitored values, operating rates and averaging times, materials used in a process or production, modeling, or other reasonable measurement practices.

16 18. "Registration" means a registration under R18-2-302.01.

17 19. "Replicable" means, with respect to methods or procedures, sufficiently unambiguous that the same or equivalent results would be obtained by the application of the method or procedure by different users.

18 20. "Responsible official" means one of the following:

a. For a corporation: a president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other person who performs similar policy or decision-making functions for the corporation, or a duly authorized representative of such person if the representative is responsible for the overall operation of one or more manufacturing, production, or operating facilities applying for or subject to a permit and either:

i. The facilities employ more than 250 persons or have gross annual sales or expenditures exceeding $25 million (in second quarter 1980 dollars); or

ii. The delegation of authority to such representatives is approved in advance by the permitting authority;

b. For a partnership or sole proprietorship: a general partner or the proprietor, respectively;

c. For a municipality, state, federal, or other public agency: Either a principal executive officer or ranking elected official. For the purposes of this Article, a principal executive officer of a federal agency includes the chief executive officer having responsibility for the overall operations of a principal geographic unit of the agency (e.g., a Regional Administrator of EPA); or

d. For affected sources:

i. The designated representative in so far as actions, standards, requirements, or prohibitions under Title IV of the Act or the regulations promulgated thereunder are concerned; and

ii. The designated representative for any other purposes under 40 CFR 70 .

21. "Screening model" means air dispersion modeling performed with screening techniques in accordance with 40 CFR 51, Appendix W as of June 30, 2017 (and no future amendments or additions).

19 22. "Small source" means a source with a potential to emit, without controls, less than the rate defined as permitting exemption thresholds in R18-2-101, but required to obtain a permit solely because it is subject to a standard under 40 CFR 63.

20 23. "Startup" means the setting in operation of a source for any purpose.

21 24. "Synthetic minor" means a source with a permit that contains voluntarily accepted emissions limitations, controls, or other requirements (for example, a cap on production rates or hours of operation, or limits on the type of fuel) under R18-2-306.01 to reduce the potential to emit to a level below the major source threshold.

22. "Uncontrolled potential to emit" means the maximum capacity of a stationary source to emit a pollutant, excluding secondary emissions, under its physical and operational design. Any physical or operational limitation on the capacity of the source to emit a pollutant, including air pollution control equipment and restrictions on hours of operation or on the type or amount of material combusted, stored, or processed, shall be treated as part of its design only if the limitation or the effect it would have on emissions is subject to an elective limit under R18-2-302.01(F) .

Notes

Ariz. Admin. Code § R18-2-301

Former Section R18-2-301 renumbered to R18-2-302, new Section R18-2-301 adopted effective September 26, 1990 (Supp. 90-3). Correction to table in subsection (A)(13) (Supp. 93-1). Section repealed, new Section adopted effective November 15, 1993 (Supp. 93-4). Amended effective August 1, 1995 (Supp. 95-3). Amended by final rulemaking at 5 A.A.R. 4074, effective September 22, 1999 (Supp. 99-3). Amended by final rulemaking at 6 A.A.R. 343, effective December 20, 1999 (Supp. 99-4). Amended by final rulemaking at 7 A.A.R. 5670, effective January 1, 2002 (Supp. 01-4). Amended by final rulemaking at 18 A.A.R. 1542, effective August 7, 2012 (Supp. 12-2). Amended by final rulemaking at 23 A.A.R. 333, effective 3/21/2017. Amended by final rulemaking at 25 A.A.R. 3630, effective 2/1/2020.