Ariz. Admin. Code § 18-2-334

Current through Register Vol. 30, No. 50, December 13, 2024

Section R18-2-334 - Minor New Source Review

A. Applicability.

1. Except as provided in subsection (A)(4), this Section shall apply to the following activities:

a. Construction of any new Class I or Class II source, including the construction of any source requiring a Class II permit under R18-2-302.01(C)(4); or

b. Any minor NSR modification to a Class I or Class II source.

2. This Section shall apply to a regulated minor NSR pollutant emitted by a new stationary source subject to this Section, if the source will have the potential to emit that pollutant at an amount equal to or greater than the permitting exemption threshold.

3. This Section shall apply to an increase in emissions of a regulated minor NSR pollutant from a minor NSR modification, if the modification would increase the source's potential to emit that pollutant by an amount equal to or greater than the permitting exemption threshold.

4. This Section shall not apply to the emissions of a pollutant from any of the activities identified in this subsection, if the emissions of that pollutant are subject to Article 4 of this Chapter.

B. No person shall begin actual construction of a new stationary source, or minor NSR modification, subject to this Section without first obtaining a permit, a permit revision, a proposed final permit, or a proposed final permit revision from the Director in accordance with R18-2-304.

C The Director shall not issue a proposed final Class I permit or permit revision or a Class II permit or permit revision subject to this Section to a person proposing to construct a new source or make a minor NSR modification unless the source or modification meets one of the following conditions for each regulated minor NSR pollutant subject to this section:

1. The owner or operator elects to implement RACT.

a. In the case of a new source, the owner or operator shall implement RACT for each emissions unit that has the potential to emit a regulated minor NSR pollutant in an amount equal to or greater than 20% of the permitting exemption threshold.

b. In the case of a minor NSR modification, the owner or operator shall implement RACT for each emissions unit that will experience an increase in the potential to emit a regulated minor NSR pollutant equal to or greater than 20% of the permitting exemption threshold.

c. When it is technically feasible and otherwise consistent with the definition of RACT to apply the same devices, systems, process modifications, work practices or other apparatus or techniques to a group of emissions units, that group of emissions units shall be treated as a single emissions unit for purposes of subsections (C)(1)(a) and (b). The following are examples of situations to which this subsection (may) apply:

i. Emissions from a group of emissions units can be vented to a single control device.

ii. A low-VOC coating can be used in several spray-painting booths.

2. An ambient air quality assessment demonstrates that emissions from the source or minor NSR modification will not interfere with attainment or maintenance of a national ambient air quality standard in any area.

a. An owner or operator may elect to have the Director perform a screening model of its emissions. If the results of the screening model indicate that the source or minor NSR modification will interfere with attainment or maintenance of a national ambient air quality standard, the owner or operator may perform a more refined model to make the demonstration required by this subsection.

b. The requirements of this subsection shall be satisfied, if the results of the screening or more refined model conducted pursuant to subsection (B)(2)(a) demonstrate either of the following:

i. Ambient concentrations resulting from emissions from the source or modification combined with existing concentrations of regulated minor NSR pollutants will not interfere with attainment or maintenance of a national ambient air quality standard.

ii. Emissions from the source or minor modification will have an ambient impact below the significance levels as defined in R18-2-401.

c. The assessment required by this subsection shall take into account any limitations, controls or emissions decreases that are or will be enforceable in the permit or permit revision for the source.

D. RACT Determinations.

1. Except as otherwise provided in this subsection, the Director shall determine RACT on the basis of a case-by-case analysis performed by the permit applicant of the emission reduction methods available for each emission unit subject to the RACT requirement under subsection (C)(1).

2. The Director shall accept a requirement proposed by a permit applicant as RACT under subsection (C)(1) if it complies with the most recently adopted of the following guidelines or standards in effect at the time of the application:

a. A control technique guideline issued by the Administrator under section 108(f)(1) of the Act.

b. An emissions standard established or revised by the Administrator for the same type of source under section 111 or 112 of the Act after November 15, 1990.

c. An applicable requirement of this Chapter or of air quality control regulations adopted by a County under A.R.S. § 49-479 that has been specifically identified as constituting RACT.

d. A RACT standard imposed on the same type of source by a general permit.

e. A RACT standard imposed on the same type of source under this Section no more than 10 years before submission of the application by the permit applicant. To facilitate identification of previously imposed RACT standards, the Director shall establish an online database of RACT determinations made under this Section.

E. Notwithstanding an election to adopt RACT under subsection (C)(1), a permit applicant subject to this Section shall conduct an ambient air quality impact assessment under subsection (C)(2) upon the Director's request. The Director shall make such a request, if there is reason to believe that a source or minor NSR modification could interfere with attainment or maintenance of a national ambient air quality standards. In making that determination, the Director shall take into consideration:

1. The source's emission rates.

2. The location of emission units within the facility and their proximity to the ambient air.

3. The terrain in which the source is or will be located.

4. The source type.

5. The location and emissions of nearby sources.

6. Background concentrations of regulated minor NSR pollutants.

F. The Director shall deny an application for a Class I permit or permit revision or a Class II permit or permit revision subject to this Section, if an assessment conducted pursuant to subsection (C)(2) demonstrates that the source or modification will interfere with attainment or maintenance of a national ambient air quality standard.

G. A copy of the notice required by R18-2-330 for permits or significant permit revisions subject to this Section must also be sent to the Administrator through the appropriate regional office, and to all other state and local air pollution control agencies having jurisdiction in the region in which the source subject to the permit or permit revision will be located. The notice also must be sent to any other agency in the region having responsibility for implementing the procedures required under 40 CFR 51, Subpart I.

H. All modeling required pursuant to this Section shall be conducted in accordance with 40 CFR 51, Appendix W as of June 30, 2017

I. The Director shall specify those conditions in the permit that are implemented pursuant to this Section. The specified conditions shall be included in subsequent permit renewals unless modified pursuant to this Section or Article 4 of this Chapter.

J. The issuance of a permit or permit revision under this Section shall not relieve the owner or operator of the responsibility to comply fully with applicable provisions of the SIP and any other requirements under local, state, or federal law.

Ariz. Admin. Code § R18-2-334

New Section made 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.