R18-2-607. Storage Piles

A. No person shall cause, suffer, allow, or permit organic or inorganic dust producing material to be stacked, piled, or otherwise stored without taking

reasonable precautions such as chemical stabilization, wetting, or covering to prevent excessive amounts of particulate matter from becoming airborne.

B. Stacking and reclaiming machinery utilized at storage piles shall be operated at all times with a minimum fall of material and in such manner, or with the

use of spray bars and wetting agents, as to prevent excessive amounts of particulate matter from becoming airborne.

Historical Note

Section R18-2-607 renumbered from R18-2-407 effective November 15, 1993 (Supp. 93-4).
R18-2-407. Air Quality Impact Analysis and Monitoring Requirements

A. Any application for a permit or permit revision under this Article to construct a new major 

source or major modification to a major source shall contain an analysis of ambient air quality 

in the area that the new major source or major modification would affect for each of the 

following pollutants:

1. For the new source, each pollutant that it would have the potential to emit in a significant 

amount;

2. For the modification, each pollutant for which it would result in a significant net emissions 

increase.

B. With respect to any such pollutant for which no Arizona ambient air quality standard exists, the 

analysis shall contain all air quality monitoring data as the Director determines is necessary to 

assess ambient air quality for that pollutant in any area that the emissions of the pollutant would 

affect.

C. With respect to any such pollutant (other than nonmethane hydrocarbons) for which such a 

standard does exist, the analysis shall contain continuous air quality monitoring data gathered 

for purposes of determining whether emissions of that pollutant would cause or contribute to 

a violation of the standard or any maximum allowable increase.

D. In general, the continuous air quality monitoring data that is required shall have been gathered 

over a period of at least one year and shall represent at least the year preceding receipt of the 

application, except that, if the Director determines that a complete and adequate analysis can 

be accomplished with monitoring data gathered over a period shorter than one year (but not to 

be less than four months), the data that is required shall have been gathered over at least that 

shorter period.

E. The owner or operator of a proposed stationary source or modification to a source of volatile 

organic compounds who satisfies all conditions of 40 CFR 51, Appendix S, Section IV, may 

provide post-approval monitoring data for ozone in lieu of providing preconstruction data as 

required under subsections (B), (C), and (D) above.

F. Post-construction monitoring. The owner or operator of a new major source or major 

modification shall, after construction of the source or modification, conduct such ambient 

monitoring as the Director determines is necessary to determine the effect emissions from the 

new source or modification may have, or are having, on air quality in any area.

G. Operations of monitoring stations. The owner or operator of a new major source or major 

modification shall meet the requirements of 40 CFR 58, Appendix B, during the operation of 

monitoring stations for purposes of satisfying subsections (B) through (F) above.

H. The requirements of subsections (B) through (G) above shall not apply to a new major source 

or major modification to an existing source with respect to monitoring for a particular pollutant 

if:

1. The emissions increase of the pollutant from the new source or the net emissions increase 

of the pollutant from the modification would cause, in any area, air quality impacts less 

than the following amounts:

a. Carbon Monoxide - 575 μg/m3, eight-hour average;

b. Nitrogen dioxide - 14 μg/m3, annual average;

c. PM2.5 - 4 μg/m3, 24-hour average;

d. PM10 - 10 μg/m3, 24-hour average;

e. Sulfur dioxide - 13 μg/m3, 24-hour average;

f. Lead - 0.1 μg/m3, 24-hour average;
g. Fluorides - 0.25 μg/m3, 24-hour average;

h. Total reduced sulfur - 10 μg/m3, one-hour average;

i. Hydrogen sulfide - 0.04 μg/m3, one-hour average;

j. Reduced sulfur compounds - 10 μg/m3, one-hour average;

k. Ozone - increased emissions of less than 100 tons per year of volatile organic compounds 

or oxides of nitrogen; or

2. The concentrations of the pollutant in the area that the new source or modification would 

affect are less than the concentrations listed in subsection (H)(1) above.

I. Any application for permit or permit revision under this Article to construct a new major source 

or major modification to a source shall contain:

1. An analysis of the impairment to visibility, soils, and vegetation that would occur as a result 

of the new source or modification and general commercial, residential, industrial, and other 

growth associated with the new source or modification. The applicant need not provide an 

analysis of the impact on vegetation having no significant commercial or recreational 

value.

2. An analysis of the air quality impact projected for the area as a result of general commercial, 

residential, industrial, and other growth associated with the new source or modification.

Historical Note

Adopted effective May 14, 1979 (Supp. 79-1). Former Section R9-3-407 renumbered without 

change as Section R18-2-407 (Supp. 87-3). Section R18-2-407 renumbered to R18-2-

607, new Section R18-2-407 adopted effective November 15, 1993 (Supp. 93-4). 

Amended by final rulemaking at 18 A.A.R. 1542, effective August 7, 2012 (Supp. 12-2).