Dust Sources, Control and Training
The Maricopa County Air Quality Department does not address dust complaints resulting from agricultural sources. Complaints about dust from agricultural sources should be submitted to the Arizona Department of Environmental Quality (ADEQ) by using their Online Complaint Form.
ADEQ also offers a compliance assistance program for commercial farmers to ensure compliance with laws and rules that address air quality standards within the Maricopa County PM10 non-attainment area.
There are three types of sites or activities governed by Maricopa County dust control regulations. If you have any questions about whether your site or activities are covered by these regulations, please call 602-506-6010.
Dust control certifications are required in order to engage in many dust-generating activities. Visit our Dust Control Training page to learn more, or to find out if you need dust control certification.
Dust Control Permit Application Submission
Follow the Online Dust Control Permit Application steps to obtain, complete and submit your dust control application online.
You may also submit the paperwork in person by following these steps.
Traditional Dust-Generating Activities (Rule 310)
Any activity capable of generating fugitive dust (such as construction, earthmoving, demolition, or weed abatement), regardless of the size of the site, must comply with Rule 310 and control potential dust.
In addition, a Dust Control Permit is required by Rule 310 (PDF) for many types of sites, such as:
- Activities that will disturb a surface area equal to or greater than 0.1 acre
- Bulk material handling
- The demolition of buildings
Non-Traditional Dust-Generating Activities (Rule 310.01)
Sources of dust which must comply with Rule 310.01 (PDF) include:
- Vehicle use in open areas and vacant lots
- Open areas and vacant lots
- Unpaved parking lots
- Unpaved roadways (including alleys)
- Livestock activities
- Erosion-caused deposition of bulk materials onto paved surfaces
- Easements, rights-of-way, and access roads for utilities (transmission of electricity, natural gas, oil, water, and gas)
Gravel, Concrete, Asphalt & Related Activities (Rule 316)
Processing plants that mine, excavate, separate, combine, crush or grind any nonmetallic mineral are governed by Rule 316. ‘Nonmetallic minerals’ includes (but is not limited to) crushed and broken stone, sand and gravel, clay, rock salt, gypsum, sodium compounds, and mixtures of these minerals such as concrete and asphalt.
Some types of facilities or activities governed by Rule 316 are:
- Crushing and screening of nonmetallic minerals
- Sand and gravel operations
- Asphalt plants
- Concrete batch plants
Rule 316 Resources
Rule 316 establishes emission limitations and requires the implementation of process controls and fugitive dust control measures for nonmetallic mineral processing plants, asphaltic concrete plants, concrete plants and/or bagging operations, as well as material storage and silo loading operations that occur at these facilities.
For a comprehensive overview of Rule 316 and how it may apply to your activities, see the Rule 316 Handbook (PDF). Some additional topics are addressed below. Permit applications, dust control plan forms, and operations and maintenance (O&M) plan forms are available on our Forms and Applications page. If you have any questions or need assistance in completing any of these documents, please call (602) 506-6010.
Is a screen that removes oversize aggregate at an asphaltic concrete batch plant subject to the moisture testing requirements in Section 301?
Yes. All screening processes are subject to Rule 316, Section 301. Therefore, any screening process located at an asphaltic concrete batch plant will also be subject to Rule 316, Section 301 requirements for screening including the requirements to maintain minimum moisture content and conduct moisture testing.
Several plants find that flood control structures prevent them from laying a full 1/4 mile of paved roadway between the rumble grate and the paved area accessible to the public. If the plants are just a little short of the 1/4 mile, what can they do?
The owners/operators may submit a request to the control officer for approval of alternative control measure pursuant to Rule 316, Section 307 consisting of the almost 1/4 mile of paved roadway and an added control to compensate for the shortfall in paving. (e.g., include an additional rumble grate somewhere along the road or add a grizzly so that the truck wheels do not contact dirt crossing the flood control structure.)
The batch plants at my facility are located in the pit. Am I still required to maintain a cohesive hard surface on the roads serving the asphaltic concrete batch plant and concrete batch plant loading areas?
Yes. Rule 316, Section 307.4(a) requires all batch trucks and delivery trucks remain on roads with paved surfaces or cohesive hard surfaces.
An aggregate delivery truck only supplies the batch plants onsite. However, the truck must go through the scales before delivering the aggregate. Does this truck have to remain on a paved or cohesive hard surface?
Rule 316, Section 307.4(b) provides a limited exemption for the aggregate delivery truck to leave the paved or cohesive hard surface to drive to and return from the aggregate loading area. Otherwise the truck is required to remain on paved roads or cohesive hard surfaces designated for batch trucks and delivery trucks or for vehicular travel in the permanent areas of the site. The rule assumes that stockpiles shrink, expand or are re-located so that the aggregate loading area will not be a permanent area of the site.
My facility has pavement (concrete) throughout the entire site. Do I have to install a rumble grate?
Maybe. Rumble grates are required at all facilities unless all of the following requirements are met:
- All potential fugitive dust emissions are controlled by an approved emission control system;
Pavement is installed and maintained on all internal travel, parking, and vehicle maneuvering areas;
All emissions from processes that create dust are captured by an approved emission control system;
All dry material storage silos are equipped with an overflow warning system/device and a pressure control system which prevents spillage during silo loading;
All material from rail car bottom dumping is contained in areas where no vehicle use or maneuvering is permitted; and
All material transfer operations are conducted in a manner that prevents spillage of material to the ground.
Since the area accessible to the public is unpaved, no trackout control device is required. However, the facility must still comply with the requirement to maintain a cohesive hard surface on all on-site roads in the permanent areas of the site and on all roads on which batch trucks and delivery trucks drive.
Is a company that owns or operates asphalt delivery trucks, ready-mix delivery trucks, and delivery trucks that haul heavy rock to construction sites required to be registered under the Subcontractor Registration Program?
Although the types of trucks listed above are not specifically identified in the dust generating operation definition, these types of trucks use staging areas, parking areas, material storage areas, or access routes to and from a site. All of these activities are dust-generating operations, therefore, a company that owns or operates asphalt delivery trucks, ready-mix delivery trucks, and delivery trucks that haul heavy rock must be registered under the Subcontractor Registration Program.
Information on the Subcontractor Registration Program including the application form and instructions can be found on our Subcontractor Registration page.
Page reviewed 23 May 2019
Page reviewed 23 May 2019