Arizona Air Quality Permit (15-AZ-a)

Information current as of 2024

In Arizona, geothermal construction activities and equipment typically do not require an Air Quality Permit from the Arizona Department of Environmental Quality, Air Quality Division (ADEQ). The temporary use of a portable diesel generator that qualifies as a “nonroad engine” under 40 C.F.R. § 89.2 does not require an Air Quality Permit pursuant to Ariz. Admin. Code § 18-2-302(A). Other construction equipment (e.g., brazing, soldering, and welding equipment that does not emit hazardous air pollutant metals) for geothermal projects is often categorized as a “trivial activity” and is therefore exempt from obtaining an Air Quality Permit. Ariz. Admin. Code § 18-2-101(146) 

Air Quality Permit Process

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15-AZ-a.1 to 15-AZ-a.2–Does the Project Extend into Maricopa, Pima, or Pinal Counties?

A developer whose project that extends into Maricopa County, Pima County, or Pinal County, the developer should consult the Maricopa County Air Quality Department (MCAQD), the Pima County Department of Environmental Quality (PCDEQ), or the Pinal County Air Quality Control District (PCAQCD), respectively. MCAQD, PCDEQ, and PCAQCD each have their own permitting programs, and the developer must apply for applicable permits with those programs. U.S. Environmental Protection Agency – Clean Air Permitting in Arizona.

15-AZ-a.3–Comply With Mobile Dust and Fugitive Dust Rules

The developer must comply with Arizona’s mobile source rules contained in Ariz. Admin. Code § R18-2-801, which require a developer prevent mobile sources from emitting smoke or dust in excess of 40% opacity.  Ariz. Admin. Code § R18-2-801(B). Arizona’s mobile source rules also contain equipment-specific limitations in Arizona – Ariz. Admin. Code §§ R18-2-801 – R18-2-805, Emissions from Mobile Sources.  A developer must comply with Arizona’s rules for motor vehicles contained in Ariz. Admin Code § R18-2-1003.

The developer must comply with fugitive dust rules contained in Ariz. Admin Code § R18-2-605, which require a developer to take reasonable precautions to limit excessive amounts of particulate matter from becoming airborne and to keep dust and other air contaminants to a minimum through the use of good modern practices. Ariz. Admin. Code § R18-2-604(A)-(B); Ariz. Admin. Code §R18-2-606; Ariz. Admin. Code § R18-2-607. 

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References

U.S. Environmental Protection Agency – Clean Air Permitting in Arizona

RAPID/Roadmap/15-AZ-a