REGULATION III - CONTROL OF AIR CONTAMINANTS 

RULE 316 

NONMETALLIC MINERAL PROCESSING 

INDEX 

SECTION 100 - GENERAL 

101 PURPOSE 

102 APPLICABILITY 

SECTION 200 - DEFINITIONS 

201 AFFECTED OPERATION 

202 AGGREGATE TRUCK 

203 APPROVED EMISSION CONTROL SYSTEM 

204 AREA ACCESSIBLE TO THE PUBLIC 

205 ASPHALTIC CONCRETE PLANT/ASPHALT PLANT 

206 BAGGING OPERATION 

207 BATCH TRUCK 

208 BELT CONVEYOR 

209 BERMS AND GUARD RAILS 

210 BULK MATERIAL 

211 COHESIVE HARD SURFACE 

212 CONCRETE PLANT 

213 CONVEYING SYSTEM 

214 CRUSHER 

215 DISTURBED SURFACE AREA 

216 DRY MIX CONCRETE PLANT 

217 DUST GENERATING OPERATION 

218 DUST SUPPRESSANT 

219 ENCLOSED TRUCK OR RAILCAR LOADING STATION 

220 END OF WORK DAY 

221 FABRIC FILTER BAGHOUSE 

222 FREEBOARD 

223 FUGITIVE DUST CONTROL MEASURE 

224 FUGITIVE DUST CONTROL TECHNICIAN 

316.1
225 FUGITIVE DUST EMISSION 

226 GRINDING MILL 

227 HAUL/ACCESS ROAD 

228 HAUL TRUCK 

229 INFREQUENT OPERATIONS 

230 MATERIAL DELIVERY TRUCK 

231 MIXER TRUCK 

232 MOTOR VEHICLE 

233 NEW FACILITY 

234 NONMETALLIC MINERAL 

235 NONMETALLIC MINERAL PROCESSING PLANT 

236 OPEN STORAGE PILE 

237 OVERBURDEN OPERATION 

238 PARTICULATE MATTER EMISSIONS 

239 PAVE 

240 PERMANENT AREAS OF A FACILITY 

241 PORTLAND CEMENT PLANT 

242 PRESSURE CONTROL SYSTEM 

243 PROCESS 

244 PROCESS SOURCE 

245 PRODUCTION WORK SHIFT 

246 PUBLIC ROADWAYS 

247 RETURNED PRODUCTS 

248 RUMBLE GRATE 

249 SCREENING OPERATION 

250 SILO 

251 SILT 

252 SPILLAGE 

253 STACK EMISSIONS 

254 STAGING AREA 

255 TEMPORARY FACILITY 

256 TRACKOUT 

257 TRACKOUT CONTROL DEVICE 

316.2
258 TRANSFER POINT 

259 TRUCK DUMPING 

260 TRUCK WASHER 

261 UNPAVED ROAD 

262 VENT 

263 WHEEL WASHER 

264 WIND EVENT 

SECTION 300 - STANDARDS 

301 CRUSHING AND SCREENING - PROCESS EMISSION LIMITATIONS AND 

CONTROLS 

302 ASPHALTIC CONCRETE PLANTS - PROCESS EMISSION LIMITATIONS 

AND CONTROLS 

303 RAW MATERIAL STORAGE AND DISTRIBUTION, CONCRETE PLANTS, 

AND/OR BAGGING OPERATIONS - PROCESS EMISSION LIMITATIONS 

AND CONTROLS 

304 OTHER ASSOCIATED OPERATIONS 

305 AIR POLLUTION CONTROL EQUIPMENT AND APPROVED EMISSION 

CONTROL SYSTEM (ECS) 

306 FUGITIVE DUST EMISSION LIMITATIONS 

307 FUGITIVE DUST CONTROL MEASURES 

308 FACILITY INFORMATION SIGN 

309 FUGITIVE DUST CONTROL TECHNICIAN 

310 BASIC DUST CONTROL TRAINING CLASS 

311 DUST CONTROL PLAN 

312 GENERAL REQUIREMENTS 

SECTION 400 - ADMINISTRATIVE REQUIREMENTS

401 COMPLIANCE SCHEDULE 

SECTION 500 - MONITORING AND RECORDS 

501 MONITORING, RECORDKEEPING AND REPORTING 

502 COMPLIANCE DETERMINATION FOR PROCESS EMISSIONS AND 

CONTROLS 

316.3
503 COMPLIANCE DETERMINATION FOR EMISSIONS AND CONTROLS 

THAT ARE REGULATED BY SECTION 304 AND/OR SECTION 306 OF 

THIS RULE 

504 COMPLIANCE DETERMINATION FOR SOIL MOISTURE CONTENT AND 

SOIL COMPACTION CHARACTERISTICS TEST METHODS ADOPTED BY 

REFERENCE 

505 COMPLIANCE DETERMINATION FOR STABILIZATION STANDARDS 

TEST METHODS ADOPTED BY REFERENCE 

506 CERTIFIED STREET SWEEPERS EQUIPMENT LIST ADOPTED BY 

REFERENCE 

316.4
Adopted 07/06/93 

Revised 04/21/99 

Revised 06/08/05 

Revised 03/12/08 

MARICOPA COUNTY 

AIR POLLUTION CONTROL REGULATIONS 

REGULATION III - CONTROL OF AIR CONTAMINANTS 

RULE 316 

NONMETALLIC MINERAL PROCESSING 

SECTION 100 - GENERAL 

101 PURPOSE: To limit the emission of particulate matter into the ambient air from any 

nonmetallic mineral processing plant and/or rock product processing plant. 

102 APPLICABILITY: The provisions of this rule shall apply to any commercial and/or 

industrial nonmetallic mineral processing plant and/or rock product processing plant. 

Compliance with the provisions of this rule shall not relieve any person subject to the 

requirements of this rule from complying with any other federally enforceable New 

Source Performance Standards. In such case, the more stringent standard shall apply.

SECTION 200 - DEFINITIONS: See Rule 100 (General Provisions and Definitions) of these 

rules for definitions of terms that are used but not specifically defined in this rule. For the 

purpose of this rule, the following definitions shall apply: 

201 AFFECTED OPERATION - An operation that processes nonmetallic minerals or that 

is related to such processing and process sources including, but not limited to, excavating, 

crushers, grinding mills, screening equipment, conveying systems, elevators, transfer 

points, bagging operations, storage bins, enclosed truck and railcar loading stations, and 

truck dumping. 

202 AGGREGATE TRUCK - Any truck with an open top used to transport the products of 

nonmetallic mineral processing plants and/or rock product processing plants. 

203 APPROVED EMISSION CONTROL SYSTEM - A system for reducing particulate 

emissions, consisting of collection and/or control devices which are approved in writing 

by the Control Officer and are designed and operated in accordance with good 

engineering practice. 

204 AREA ACCESSIBLE TO THE PUBLIC - Any retail parking lot or public roadway 

that is open to public travel primarily for the purposes unrelated to the dust generating 

operation. 

316.5
205 ASPHALTIC CONCRETE PLANT/ASPHALT PLANT - Any facility used to 

manufacture asphaltic concrete by mixing graded aggregate and asphaltic cements. 

206 BAGGING OPERATION - The mechanical process by which bags are filled with 

nonmetallic minerals. 

207 BATCH TRUCK - Any truck that loads and transports products produced by batch. 

208 BELT CONVEYOR - A conveying device that transports material from one location to 

another by means of an endless belt that is carried on a series of idlers and routed around 

a pulley at each end. 

209 BERMS AND GUARD RAILS - A pile or mound of material along an elevated 

roadway capable of moderating or limiting the force of a vehicle in order to impede the 

vehicle's passage over the bank of the roadway. 

210 BULK MATERIAL - Any material including, but not limited to, earth, rock, silt, 

sediment, sand, gravel, soil, fill, aggregate less than two inches in length or diameter (i.e., 

aggregate base course (ABC), dirt, mud, demolition debris, cotton, trash, cinders, pumice, 

saw dust, feeds, grains, fertilizers, fluff (from shredders), and dry concrete, that is capable 

of producing fugitive dust. 

211 COHESIVE HARD SURFACE - Any material including, but not limited to, pavement, 

recycled asphalt mixed with a binder, or a dust suppressant other than water applied and 

maintained as a roadway surface. 

212 CONCRETE PLANT - Any facility used to manufacture concrete by mixing water, 

aggregate, and cement. 

213 CONVEYING SYSTEM - A device for transporting materials from one piece of 

equipment or location to another location within a facility. Conveying systems include, 

but are not limited to, feeders, belt conveyers, bucket elevators and pressure control 

systems. 

214 CRUSHER - A machine used to crush any nonmetallic minerals including, but not 

limited to, the following types: jaw, gyratory, cone, roll, rod mill, hammermill, and 

impactor. 

215 DISTURBED SURFACE AREA - A portion of the earth's surface (or material placed 

thereupon) which has been physically moved, uncovered, destabilized, or otherwise 

modified from its undisturbed native condition, thereby increasing the potential for the 

emission of fugitive dust. 

216 DRY MIX CONCRETE PLANT - Any facility used to manufacture a mixture of 

aggregate and cements without the addition of water. 

316.6
217 DUST GENERATING OPERATION - Any activity capable of generating fugitive dust 

including, but not limited to, land clearing, earthmoving, weed abatement by discing or 

blading, excavating, construction, demolition, bulk material handling, storage and/or 

transporting operations, vehicle use and movement, the operation of any outdoor 

equipment, or unpaved parking lots. For the purpose of this rule, landscape maintenance 

and playing on or maintaining a field used for non-motorized sports shall not be 

considered a dust-generating operation. However, landscape maintenance shall not 

include grading, trenching, or any other mechanized surface disturbing activities 

performed to establish initial landscapes or to redesign existing landscapes. 

218 DUST SUPPRESSANT - Water, hygroscopic material, solution of water and chemical 

surfactant, foam, non-toxic chemical stabilizer, or any other dust palliative, which is not 

prohibited for ground surface application by the EPA or the Arizona Department of 

Environmental Quality (ADEQ), or any applicable law, rule, or regulation, as a treatment 

material for reducing fugitive dust emissions. 

219 ENCLOSED TRUCK OR RAILCAR LOADING STATION - That portion of a 

nonmetallic mineral processing plant where nonmetallic minerals are loaded by an 

enclosed conveying system into enclosed trucks or railcars. 

220 END OF WORK DAY - The end of a working period that may include one or more 

work shifts. If working 24 hours a day, the end of a working period shall be considered 

no later than 8 pm. 

221 FABRIC FILTER BAGHOUSE - Tube-shaped filter bags - long small-diameter fabric 

tubes referred to as "bags" arranged in parallel flow paths and designed to separate 

particles and flue gas. 

222 FREEBOARD - The vertical distance between the top edge of a cargo container area and 

the highest point at which the bulk material contacts the sides, front, and back of a cargo 

container area. 

223 FUGITIVE DUST CONTROL MEASURE - A technique, practice, or procedure used 

to prevent or minimize the generation, emission, entrainment, suspension, and/or airborne 

transport of fugitive dust. 

224 FUGITIVE DUST CONTROL TECHNICIAN - A person with the authority to 

expeditiously employ sufficient fugitive dust control measures to ensure compliance with 

Rule 316 of these rules at an active operation. 

225 FUGITIVE DUST EMISSION - Particulate matter not collected by a capture system 

that is entrained in the ambient air and is caused from human and/or natural activities. 

226 GRINDING MILL - A machine used for the wet or dry fine crushing of any nonmetallic 

mineral. Grinding mills include, but are not limited to, the following types: hammer, 

316.7
roller, rod, pebble and ball, and fluid energy. The grinding mill includes the air conveying 

system, air separator, or air classifier, where such systems are used. 

227 HAUL/ACCESS ROAD - Any on-site unpaved road that is used by haul trucks to carry 

materials from the quarry or pit to different locations within the facility. For the purpose 

of this definition, haul/access roads are not in permanent areas of a facility. 

228 HAUL TRUCK - Any fully or partially open-bodied self-propelled vehicle including 

any non-motorized attachments, such as but not limited to, trailers or other conveyances 

that are connected to or propelled by the actual motorized portion of the vehicle used for 

transporting bulk materials. 

229 INFREQUENT OPERATIONS - Operations that have State mine identification, 

approved reclamation plans and bonding as required by State Mining and Reclamation 

Act of 1975, and only operate on an average of 52 days per year over the past three years 

from June 8, 2005. 

230 MATERIAL DELIVERY TRUCK - Any truck that loads and transports product to 

customers. 

231 MIXER TRUCK - Any truck that mixes cement and other ingredients in a drum to 

produce concrete. 

232 MOTOR VEHICLE - A self-propelled vehicle for use on the public roads and highways 

of the State of Arizona and required to be registered under the Arizona State Uniform 

Motor Vehicle Act, including any non-motorized attachments, such as but not limited to, 

trailers or other conveyances which are connected to or propelled by the actual motorized 

portion of the vehicle. 

233 NEW FACILITY - A facility subject to this rule that has not been operated by such 

facility prior to June 8, 2005. 

234 NONMETALLIC MINERAL - Any of the following minerals or any mixture of which 

the majority is any of the following minerals: 

234.1 Crushed and broken stone, including limestone, dolomite, granite, rhyolite, 

traprock, sandstone, quartz, quartzite, marl, marble, slate, shale, oil shale, and 

shell. 

234.2 Sand and gravel. 

234.3 Clay including kaolin, fireclay, bentonite, fuller's earth, ball clay, and common 

clay. 

234.4 Rock salt. 

316.8
234.5 Gypsum. 

234.6 Sodium compounds including sodium carbonate, sodium chloride, and sodium 

sulfate. 

234.7 Pumice. 

234.8 Gilsonite. 

234.9 Talc and pyrophyllite. 

234.10 Boron including borax, kernite, and colemanite. 

234.11 Barite. 

234.12 Fluorspar. 

234.13 Feldspar. 

234.14 Diatomite. 

234.15 Perlite. 

234.16 Vermiculite. 

234.17 Mica. 

234.18 Kyanite including andalusite, sillimanite, topaz, and dumortierite. 

234.19 Coal. 

235 NONMETALLIC MINERAL PROCESSING PLANT - Any facility utilizing any 

combination of equipment or machinery that is used to mine, excavate, separate, 

combine, crush, or grind any nonmetallic mineral including, but not limited to, lime 

plants, coal fired power plants, steel mills, asphalt plants, concrete plants, Portland 

cement plants, raw material storage and distribution, and sand and gravel plants. Rock 

Product Processing Plants are included in this definition. 

236 OPEN STORAGE PILE - Any accumulation of bulk material with a 5% or greater silt 

content that has a total surface area of 150 square feet or more and that at any one point 

attains a height of three feet. Silt content shall be assumed to be 5% or greater unless a 

person can show, by testing in accordance with ASTM Method C136-06 or other 

equivalent method approved in writing by the Control Officer and the Administrator, that 

the silt content is less than 5%. For the purpose of this rule, the definition of open storage 

pile does not include berms and guard rails that are installed to comply with 30 Code of 

Federal Regulations (CFR) 56.93000. 

316.9
237 OVERBURDEN OPERATION - An operation that removes and/or strips soil, rock, or 

other materials that lie above a natural nonmetallic mineral deposit and/or in-between a 

natural nonmetallic mineral deposit. 

238 PARTICULATE MATTER EMISSIONS - Any and all finely divided solid or liquid 

materials other than uncombined water released to the ambient air as measured by the 

applicable state and federal test methods. 

239 PAVE - To apply and maintain asphalt, concrete, or other similar material to a roadway 

surface (i.e., asphaltic concrete, concrete pavement, chip seal, rubberized asphalt, or 

recycled asphalt mixed with a binder). 

240 PERMANENT AREAS OF A FACILITY - Areas that remain in-place for 180 days or 

more in 12 consecutive months. Permanent areas of a facility include the following areas: 

entrances, exits, parking areas, office areas, warehouse areas, maintenance areas (not 

including maintenance areas that are in the quarry or pit), concrete plant areas, asphaltic 

plant areas, and roads leading to and from such areas. 

241 PORTLAND CEMENT PLANT - Any facility that manufactures Portland Cement 

using either a wet or dry process. 

242 PRESSURE CONTROL SYSTEM - System in which loads are moved in the proper 

sequence, at the correct time, and at the desired speed through use of valves that control 

the direction of air flow, regulate actuator speed, and respond to changes in air pressure. 

243 PROCESS - One or more operations including those using equipment and technology in 

the production of goods or services or the control of by-products or waste. 

244 PROCESS SOURCE - The last operation of a process or a distinctly separate process 

which produces an air contaminant and which is not a pollution abatement operation. 

245 PRODUCTION WORK SHIFT - An eight hour operating period based on the 24-hour 

operating schedule. 

246 PUBLIC ROADWAYS - Any roadways that are open to public travel. 

247 RETURNED PRODUCTS - Left-over concrete or asphalt products that were not used at 

a job site and were returned to the facility. 

248 RUMBLE GRATE - A system where the vehicle is vibrated while traveling over grates 

with the purpose of removing dust and other debris. 

249 SCREENING OPERATION - A device that separates material according to its size by 

passing undersize material through one or more mesh surfaces (screens) in series and 

retaining oversize material on the mesh surfaces (screens). 

316.10
250 SILO - An elevated storage container with or without a top that releases material thru the 

bottom. 

251 SILT - Any aggregate material with a particle size less than 75 micrometers in diameter, 

which passes through a No. 200 Sieve. 

252 SPILLAGE - Any quantity of nonmetallic minerals/materials that spill while being 

processed or after having been processed by an affected operation, where such spilled 

nonmetallic minerals/ materials can generate or cause fugitive dust emissions. 

253 STACK EMISSIONS - The particulate matter emissions that are released to the 

atmosphere from a capture system through a building vent, stack or other point source 

discharge. 

254 STAGING AREA - A place where aggregate trucks and mixer trucks temporarily queue 

for their loading or unloading. 

255 TEMPORARY FACILITY - A facility that occupies a designated site for not more than 

180 days in a calendar year. 

256 TRACKOUT - Any and all bulk materials that adhere to and agglomerate on the 

surfaces of motor vehicles, haul trucks, and/or equipment (including tires) and that have 

fallen or been deposited onto a paved area accessible to the public. 

257 TRACKOUT CONTROL DEVICE - A gravel pad, grizzly, wheel washer, rumble 

grate, paved area, truck washer, or other equivalent trackout control device located at the 

point of intersection of an unpaved area and a paved area accessible to the public that 

controls and prevents trackout and/or removes particulate matter from tires and the 

exterior surfaces of aggregate trucks, haul trucks, and/or motor vehicles that traverse a 

facility. 

258 TRANSFER POINT - A point in a conveying operation where nonmetallic mineral is 

transferred from or to a belt conveyor except for transfer to a stockpile. 

259 TRUCK DUMPING - The unloading of nonmetallic minerals from movable vehicles 

designed to transport nonmetallic minerals from one location to another. Movable 

vehicles include, but are not limited to, trucks, front end loaders, skip hoists, and railcars. 

260 TRUCK WASHER - A system that is used to wash the entire surface and the tires of a 

truck. 

261 UNPAVED ROAD - Any roads, equipment paths, or travel ways that are not covered by 

typical roadway materials. Public unpaved roads are any unpaved roadway owned by 

Federal, State, county, municipal, or governmental or quasigovernmental agencies. 

Private unpaved roads are all other unpaved roadways not defined as public. 

316.11
262 VENT - An opening through which there is mechanically or naturally induced air flow 

for the purpose of exhausting air carrying particulate matter. 

263 WHEEL WASHER - A system that is capable of washing the entire circumference of 

each wheel of the vehicle. 

264 WIND EVENT - When the 60-minute average wind speed is greater than 25 miles per 

hour. 

SECTION 300 - STANDARDS 

301 CRUSHING AND SCREENING - PROCESS EMISSION LIMITATIONS AND 

CONTROLS: 

301.1 Process Emission Limitations: The owner and/or operator shall not discharge or 

cause or allow to be discharged into the ambient air: 

a. Stack emissions exceeding 7% opacity and containing more than 0.02 

grains/dry standard cubic foot (gr/dscf) (50 mg/dscm) of particulate 

matter. 

b. Fugitive dust emissions exceeding 7% opacity from any transfer point on a 

conveying system. 

c. Fugitive dust emissions exceeding 15% opacity from any crusher. 

d. Fugitive dust emissions exceeding 10% opacity from any affected 

operation or process source, excluding truck dumping. 

e. Fugitive dust emissions exceeding 20% opacity from truck dumping 

directly into any screening operation, feed hopper, or crusher. Opacity 

observations to determine compliance with this section of this rule shall be 

conducted in accordance with the techniques specified in Appendix CFugitive Dust Test Methods of these rules. 

301.2 Controls: The owner and/or operator shall implement process controls described 

in Section 301.2(a), Section 301.2(b), and Section 301.2(c) of this rule or shall 

implement process controls described in Section 301.2(a) and Section 301.2(d) of 

this rule: 

a. Enclose sides of all shaker screens. 

316.12
b. Permanently mount watering systems (e.g., spray bars or an equivalent 

control) on the points listed below for crushers, shaker screens, and 

material transfer points. 

(1) Inlet and outlet of all crushers; 

(2) Outlet of all shaker screens; and 

(3) Outlet of all material transfer points, excluding wet plants. 

c. Operate watering systems (e.g., spray bars or an equivalent control) on the 

points listed in Section 301.2(b) of this rule for crushers, shaker screens, 

and material transfer points, excluding wet plants, to continuously 

maintain a 4% minimum moisture content. 

(1) The watering systems shall be maintained in good operating 

condition, as verified by daily inspections. 

(2) The owner and/or operator shall investigate and correct any 

problems before continuing and/or resuming operations. 

(3) The owner and/or operator shall conduct soil moisture tests as 

follows: 

(a) If the owner and/or operator is required to have in place a 

Fugitive Dust Control Technician according to Section 309 

of this rule, then soil moisture tests shall be conducted 

twice daily in accordance with the test methods described 

in Section 502 of this rule. 

(b) If the owner and/or operator is not required to have in place 

a Fugitive Dust Control Technician according to Section 

309 of this rule, then soil moisture tests shall be conducted 

daily in accordance with the test methods described in 

Section 502 of this rule. 

(c) If the owner and/or operator demonstrates that the 4% 

minimum moisture content is maintained for a minimum of 

four weeks, then soil moisture tests may be conducted 

weekly in accordance with the test methods described in 

Section 502 of this rule. 

(d) If the owner and/or operator fails to comply with the 

opacity limitations described in Section 301.1, Section 

306.1, or Section 306.2 of this rule and/or if two 

consecutive soil moisture tests are below 4%, then the 

owner and/or operator shall conduct soil moisture tests in 

316.13
accordance with Section 301.2(c)(3)(a) or Section 

301.2(c)(3)(b) of this rule, as applicable. 

(e) If the owner and/or operator of a facility complies with 

both of the following requirements, then the number of 

sampling points identified in Section 502.3(c)(1) through 

(3) of this rule may be reduced: 

(i) A soil moisture test is conducted in accordance with 

the test methods described in Section 502 of this 

rule at the primary crusher, which indicates that at 

least a 5% minimum moisture content is 

maintained; and 

(ii) A demonstration that complies with Section 

502.3(d) of this rule is submitted to and approved 

by the Control Officer and is complied with in 

accordance with Section 502.3(d) of this rule. 

(4) The owner and/or operator may request in a permit application, 

with explanation, an alternative plan that justifies a minimum 

moisture content other than 4% and that justifies conducting fewer 

soil moisture tests as are required. In the request, the owner and/or 

operator shall submit to the Control Officer documentation 

regarding a minimum moisture content other than 4%, including, 

but not limited to, economics, emissions rates, water availability, 

and technical feasibility. In addition, the owner and/or operator 

shall demonstrate that the proposed alternative compliance 

demonstration plan will be equivalent in determining compliance 

with the soil moisture content requirements. Prior approval from 

the Control Officer and the Administrator shall be received before 

implementing the plan. 

d. Enclose and exhaust the regulated process to a properly sized fabric filter 

baghouse. 

302 ASPHALTIC CONCRETE PLANTS - PROCESS EMISSION LIMITATIONS 

AND CONTROLS: 

302.1 Process Emission Limitations: The owner and/or operator shall not discharge or 

cause or allow to be discharged into the ambient air: 

a. For non-rubberized asphaltic concrete plants, stack emissions exceeding 

5% opacity and containing more than 0.04 gr/dscf (90 mg mg/dscm) of 

particulate matter. 

316.14
b. For rubberized asphaltic concrete plants (when producing rubberized 

asphalt only), stack emissions exceeding 20% opacity and containing more 

than 0.04 gr/dscf (90 mg/dscm) of particulate matter. 

c. Fugitive dust emissions exceeding 10% opacity from any affected 

operation or process source, excluding truck dumping. 

302.2 Controls: The owner and/or operator shall, from all drum dryers, control and vent 

exhaust to a properly sized fabric filter baghouse. 

303 RAW MATERIAL STORAGE AND DISTRIBUTION, CONCRETE PLANTS, 

AND/OR BAGGING OPERATIONS - PROCESS EMISSION LIMITATIONS 

AND CONTROLS: 

303.1 Process Emission Limitations: The owner and/or operator shall not discharge or 

cause or allow to be discharged into the ambient air: 

a. Stack emissions exceeding 5% opacity. 

b. Fugitive dust emissions exceeding 10% opacity from any affected 

operation or process source, excluding truck dumping. 

303.2 Controls: The owner and/or operator shall implement the following process 

controls: 

a. On all cement, lime, and/or fly-ash storage silo(s), install an operational 

overflow warning system/device. The system/device shall be designed to 

alert operator(s) to stop the loading operation when the cement, lime, 

and/or fly-ash storage silo(s) are reaching a capacity that could adversely 

impact pollution abatement equipment. 

b. On new cement, lime, and/or fly-ash storage silos, install a properly sized 

fabric filter baghouse or equivalent device designed to meet a maximum 

outlet grain loading of 0.01 gr/dscf. 

c. On dry mix concrete plant loading stations/truck mixed product, 

implement one of the following process controls: 

(1) Install a rubber fill tube; 

(2) Install a water spray; 

(3) Install a properly sized fabric filter baghouse or delivery system; 

(4) Enclose mixer loading stations such that no visible emissions 

occur; or 

316.15
(5) Conduct mixer loading stations in an enclosed process building 

such that no visible emissions from the building occur during the 

mixing activities. 

d. On cement silo filling processing/loading operations controls, install a 

pressure control system designed to shut-off cement silo filling 

processes/loading operations, if pressure from delivery truck is excessive, 

as defined in O&M Plan. 

304 OTHER ASSOCIATED OPERATIONS: All other affected operations or process 

sources not specifically listed in Sections 301, 302, or 303 of this rule associated with the 

processing of nonmetallic minerals, all other fugitive dust emission limitations not 

specifically listed in Section 306 of this rule, all other fugitive dust control measures not 

specifically listed in Section 307 of this rule, and all overburden operations shall, at a 

minimum, meet the provisions of Rule 310 of these rules. 

305 AIR POLLUTION CONTROL EQUIPMENT AND APPROVED EMISSION 

CONTROL SYSTEM (ECS): An owner and/or operator of a facility shall provide, 

properly install and maintain in calibration, in good working order, and in operation air 

pollution control equipment required by this rule. When selecting air pollution control 

equipment required by this rule, the owner and/or operator of a facility may consider the 

site-specific and/or material-specific conditions and logistics of a facility. When doing so, 

some air pollution control equipment may be more reasonable to implement than others. 

Regardless, any air pollution control equipment that is installed must achieve the 

applicable standard(s) required by this rule, as determined by the corresponding test 

method(s), as applicable, and must achieve other applicable standard(s) set forth in this 

rule. The owner and/or operator of a facility may submit a request to the Control Officer 

and the Administrator for the use of alternative air pollution control equipment. The 

request shall include the proposed alternative air pollution control equipment, the air 

pollution control equipment that the alternative would replace, and a detailed statement or 

report demonstrating that the air pollution control equipment would result in equivalent 

or better emission control than the equipment prescribed in this rule. Nothing in this rule 

shall be construed to prevent an owner and/or operator of a facility from making such 

demonstration. Following a decision by the Control Officer and the Administrator to 

grant the petition, the facility shall incorporate the alternative air pollution control 

equipment in any required Operation and Maintenance (O&M) Plan. 

305.1 Operation and Maintenance (O&M) Plan Requirements for ECS: 

a. An owner and/or operator of a facility shall provide and maintain, readily 

available on-site at all times, (an) O&M Plan(s) for any ECS, any other 

emission processing equipment, and any ECS monitoring devices that are 

used pursuant to this rule or to an air pollution control permit. 

316.16
b. The owner and/or operator of a facility shall submit to the Control Officer 

for approval the O&M Plan(s) for each ECS and for each ECS monitoring 

device that is used pursuant to this rule. 

c. The owner and/or operator of a facility shall comply with all the identified 

actions and schedules provided in each O&M Plan. 

305.2 Operation and Maintenance (O&M) Plan Requirements for Dust Control 

Measures: 

a. An owner and/or operator of a facility shall provide and maintain, readily 

available on-site at all times, (an) O&M Plan(s) for equipment associated 

with any process fugitive emissions and fugitive dust control measures 

(i.e., gravel pads, wheel washers, truck washers, rumble grates, watering 

systems, and street sweepers) that are implemented to comply with this 

rule or an air pollution control permit. 

b. The owner and/or operator of a facility shall comply with all the identified 

actions and schedules provided in each O&M Plan. 

305.3 Providing And Maintaining ECS Monitoring Devices: An owner and/or 

operator of a facility operating an ECS pursuant to this rule shall install, maintain, 

and calibrate monitoring devices described in the O&M Plan(s). The monitoring 

devices shall measure pressures, rates of flow, and/or other operating conditions 

necessary to determine if the control devices are functioning properly. 

305.4 O&M Plan Responsibility: An owner and/or operator of a facility that is 

required to have an O&M Plan pursuant to Section 305 of this rule must fully 

comply with all O&M Plans that the owner and/or operator has submitted for 

approval, even if such O&M Plans have not yet been approved, unless notified in 

writing by the Control Officer. 

306 FUGITIVE DUST EMISSION LIMITATIONS: 

306.1 20% Opacity Limitation: For emissions that are not already regulated by an 

opacity limit, the owner and/or operator of a facility shall not discharge or cause 

or allow to be discharged into the ambient air fugitive dust emissions exceeding 

20% opacity, in accordance with the test methods described in Section 503 of this 

rule and in Appendix C-Fugitive Dust Test Methods of these rules. 

306.2 Visible Emission Limitation Beyond Property Line: An owner and/or operator 

of a facility shall not cause or allow fugitive dust emissions from any active 

operation, open storage pile, or disturbed surface area associated with such 

facility such that the presence of such fugitive dust emissions remain visible in the 

atmosphere beyond the property line of such facility. 

316.17
306.3 Wind Event: The fugitive dust emission limitations described in Section 306.1 

and Section 306.2 of this rule shall not apply during a wind event, if the owner 

and/or operator of a facility meets the following conditions: 

a. Has implemented the fugitive dust control measures described in Section 

307 of this rule, as applicable; 

b. Has compiled and retained records, in accordance with Section 501.4 of 

this rule, and has documented by records the occurrence of a wind event 

on the day(s) in question. The occurrence of a wind event must be 

determined by the nearest Maricopa County Air Quality Department 

monitoring station, from any other certified meteorological station, or by a 

wind instrument that is calibrated according to manufacturer’s standards 

and that is located at the site being checked; and 

c. Has implemented the following high wind fugitive dust control measures, 

as applicable: 

(1) For an active operation, implement one of the following fugitive 

dust control measures, in accordance with the test methods 

described in Section 503 and Section 504 of this rule and in 

Appendix C-Fugitive Dust Test Methods of these rules: 

(a) Cease active operation that may contribute to an 

exceedance of the fugitive dust emission limitations 

described in Section 306.1 of this rule for the duration of 

the wind event and, if active operation is ceased for the 

remainder of the work day, stabilize the area; or 

(b) Before and during active operations, apply water or other 

suitable dust suppressant other than water to keep the soil 

visibly moist. 

(2) For an inactive open storage pile, implement one of the following 

fugitive dust control measures, in accordance with the test methods 

described in Section 503 and Section 504 of this rule and in 

Appendix C-Fugitive Dust Test Methods of these rules: 

(a) Maintain a soil crust by applying water or other suitable 

dust suppressant other than water or by implementing 

another fugitive dust control measure, in sufficient 

quantities to meet the stabilization standards described in 

Section 505 of this rule. 

316.18
(b) Cover open storage pile with tarps, plastic, or other 

material such that wind will not remove the covering, if 

open storage pile is less than eight feet high. 

(3) For an inactive disturbed surface area, implement one of the 

following fugitive dust control measures, in accordance with the 

test methods described in Section 503 and Section 504 of this rule 

and in Appendix C-Fugitive Dust Test Methods of these rules: 

(a) Uniformly apply and maintain surface gravel or a dust 

suppressant other than water; or 

(b) Maintain a soil crust by applying water or other suitable 

dust suppressant other than water or by implementing 

another fugitive dust control measure, in sufficient 

quantities to meet the stabilization standards described in 

Section 505 of this rule. 

306.4 Silt Loading And Silt Content Standards For Unpaved Roads And Unpaved 

Parking And Staging Areas: From unpaved roads and unpaved parking and 

staging areas, the owner and/or operator of a facility shall not discharge or allow 

to be discharged into the ambient air fugitive dust emissions exceeding 20% 

opacity, in accordance with the test methods described in Section 502 of this rule 

and in Appendix C-Fugitive Dust Test Methods of these rules, and one of the 

following: 

a. For unpaved roads, silt loading equal to or greater than 0.33 oz/ft2

 or silt 

content exceeding 6%. 

b. For unpaved parking and staging areas, silt loading equal to or greater than 

0.33 oz/ft2

 or silt content exceeding 8%.

306.5 Stabilization Standards: 

a. An owner and/or operator of a facility with an open area or a disturbed 

surface area on which no activity is occurring (including areas that are 

temporarily or permanently inactive) shall be considered in violation of 

this rule if area is not maintained in a manner that meets at least one of the 

standards listed below, as applicable. 

(1) Maintain a soil crust; 

(2) Maintain a threshold friction velocity (TFV) for disturbed surface 

areas corrected for non-erodible elements of 100 cm/second or 

higher; 

316.19
(3) Maintain a flat vegetative cover (i.e., attached (rooted) vegetation 

or unattached vegetative debris lying on the surface with a 

predominant horizontal orientation that is not subject to movement 

by wind) that is equal to at least 50%; 

(4) Maintain a standing vegetative cover (i.e., vegetation that is 

attached (rooted) with a predominant vertical orientation) that is 

equal to or greater than 30%; 

(5) Maintain a standing vegetative cover (i.e., vegetation that is 

attached (rooted) with a predominant vertical orientation) that is 

equal to or greater than 10% and where the threshold friction 

velocity is equal to or greater than 43 cm/second when corrected 

for non-erodible elements; 

(6) Maintain a percent cover that is equal to or greater than 10% for 

non-erodible elements; or 

(7) Comply with a standard of an alternative test method, upon 

obtaining the written approval from the Control Officer and the 

Administrator. 

b. If no activity is occurring on an open storage pile and material handling or 

surface soils where support equipment and vehicles operate in association 

with such facility and if an open storage pile and material handling or 

surface soils where support equipment and vehicles operate in association 

with such facility contain more than one type of visibly distinguishable 

stabilization characteristics, soil, vegetation, or other characteristics, 

which are visibly distinguishable, the owner and/or operator shall test each 

representative surface separately for stability, in an area that represents a 

random portion of the overall disturbed conditions of the site, in 

accordance with the appropriate test methods described in Section 505 of 

this rule and in Appendix C-Fugitive Dust Test Methods of these rules. 

307 FUGITIVE DUST CONTROL MEASURES: The owner and/or operator of a 

nonmetallic mineral processing plant and/or a rock product processing plant shall 

implement the fugitive dust control measures described in this section of this rule. When 

selecting a fugitive dust control measure(s), the owner and/or operator of a facility may 

consider the site-specific and/or material-specific conditions and logistics of a facility. 

When doing so, some fugitive dust control measures may be more reasonable to 

implement than others. Regardless, any fugitive dust control measure that is implemented 

must achieve the applicable standard(s) described in Section 306 of this rule, as 

determined by the corresponding test method(s), as applicable, and must achieve other 

applicable standard(s) set forth in this rule. The owner and/or operator of a facility may 

submit a request to the Control Officer and the Administrator for the use of alternative 

control measure(s). The request shall include the proposed alternative control measure, 

316.20
the control measure that the alternative would replace, and a detailed statement or report 

demonstrating that the measure would result in equivalent or better emission control than 

the measures prescribed in this rule. Nothing in this rule shall be construed to prevent an 

owner and/or operator of a facility from making such demonstration. Following a 

decision by the Control Officer and the Administrator to grant the petition, the facility 

shall incorporate the alternative control measure in any required Dust Control Plan. When 

engaged in the activities described in Section 301 and Section 307.1 through Section 

307.9 of this rule, the owner and/or operator of a facility shall install, maintain, and use 

fugitive dust control measures as described in Section 307.1 through Section 307.9 of this 

rule, as applicable. 

307.1 Open Storage Piles and Material Handling: The owner and/or operator of a 

facility shall implement all of the following fugitive dust control measures, as 

applicable. For the purpose of this rule, open storage pile(s) and material handling 

does not include berms and guard rails that are installed to comply with 30 CFR 

56.93000. However, such berms and guard rails shall be installed and maintained 

in compliance with Section 306.1, Section 306.2, and Section 306.5 of this rule. 

a. Prior to, and/or while conducting loading and unloading operations, 

implement one of the following fugitive dust control measures: 

(1) Spray material with water, as necessary; or 

(2) Spray material with a dust suppressant other than water, as 

necessary. 

b. When not conducting loading and unloading operations, implement one of 

the following fugitive dust control measures: 

(1) Spray material with water, as necessary; 

(2) Maintain a 1.5% or more soil moisture content of the open storage 

pile(s); 

(3) Locate open storage pile(s) in a pit/in the bottom of a pit; 

(4) Arrange open storage pile(s) such that storage pile(s) of larger 

diameter products are on the perimeter and act as barriers to/for 

open storage pile(s) that could create fugitive dust emissions; 

 (5) Construct and maintain wind barriers, storage silos, or a threesided enclosure with walls, whose length is no less than equal to 

the length of the pile, whose distance from the pile is no more than 

twice the height of the pile, whose height is equal to the pile 

height, and whose porosity is no more than 50%; or 

316.21
(6) Cover open storage piles with tarps, plastic, or other material to 

prevent wind from removing the coverings. 

c. When installing new open storage pile(s) at an existing facility and/or 

when installing new open storage pile(s) at a new facility, the owner 

and/or operator shall implement all of the following fugitive dust control 

measures, only if it is determined to be feasible on a case-by-case basis 

through the Dust Control Plan by assessing the amount of open land 

available at the property at the time the new open storage pile(s) are 

formed: 

(1) Install the open storage pile(s) at least 25 feet from the property 

line; and 

(2) Limit the height of the open storage pile(s) to less than 45 feet. 

d. For existing open storage pile(s) and when installing open storage pile(s) 

for an existing facility or for a new facility, if such open storage pile(s) 

will be constructed over eight feet high and will not be covered, then the 

owner and/or operator shall install, use, and maintain a water truck or 

other method that is capable of completely wetting the surfaces of open 

storage pile(s). 

307.2 Surface Stabilization Where Support Equipment And Vehicles Operate: The 

owner and/or operator of a facility shall implement one of the following fugitive 

dust control measures on areas other than the areas identified in Section 307.3 and 

Section 307.4 of this rule where loaders, support equipment, and vehicles operate. 

a. Apply and maintain water; 

b. Apply and maintain a dust suppressant, other than water; or 

c. Apply a gravel pad, in compliance with Section 307.6(b)(4) of this rule. 

307.3 Haul/Access Roads That Are Not In Permanent Areas of a Facility: 

a. The owner and/or operator of a facility shall implement one of the 

following fugitive dust control measures, as applicable, before engaging in 

the use of, or in the maintenance of, haul/access roads. Compliance with 

the provisions of this section of this rule shall not relieve any person 

subject to the requirements of this section of this rule from complying with 

any other federally enforceable requirements (i.e., a permit issued under 

Section 404 of the Clean Water Act). 

(1) Install and maintain bumps, humps, or dips for speed control and 

apply water, as necessary; 

316.22
(2) Limit vehicle speeds and apply water, as necessary; 

(3) Pave; 

(4) Apply and maintain a gravel pad in compliance with Section 

307.6(b)(4) of this rule; 

(5) Apply a dust suppressant, other than water; or 

(6) Install and maintain a cohesive hard surface. 

b. For a new facility, if it is determined that none of the fugitive dust control 

measures described in Section 307.3(a) of this rule can be technically and 

feasibly implemented, then the owner and/or operator of a new facility 

shall maintain a minimum distance of 25 feet from the property line for 

haul/access roads associated with the new facility. Such determination 

shall be made and approved in writing by the Control Officer and the 

Administrator and shall be approved in the Dust Control Plan. 

307.4 On-Site Traffic: 

a. The owner and/or operator of a facility shall require all batch trucks and 

material delivery trucks to remain on roads with paved surfaces or 

cohesive hard surfaces. 

b. The owner and/or operator of a facility shall require all aggregate trucks to 

remain on paved surfaces or cohesive hard surfaces, except when driving 

on roads leading to and from aggregate loading areas/loading operations, 

as approved in the Dust Control Plan. 

c. The owner and/or operator of a facility shall require all batch trucks and 

material delivery trucks to enter and exit the facility/operation only 

through entrances that comply with the trackout requirements in Section 

307.6 of this rule. 

d. The owner and/or operator of a facility shall pave or install a cohesive 

hard surface on permanent areas of a facility on which vehicles drive, as 

approved in the Dust Control Plan. 

307.5 Off-Site Traffic: When hauling and/or transporting bulk material off-site, the 

owner and/or operator of a facility shall implement all of the following control 

measures: 

a. Load all haul trucks such that the freeboard is not less than three inches; 

316.23
b. Prevent spillage or loss of bulk material from holes or other openings in 

the cargo compartment’s floor, sides, and/or tailgate(s); and 

c. Cover haul trucks with a tarp or other suitable closure. 

307.6 Trackout: 

a. Rumble Grate And Wheel Washer: The owner and/or operator of a new 

permanent facility and the owner and/or operator of an existing permanent 

facility with a minimum of 60 aggregate trucks, mixer trucks, and/or batch 

trucks exiting a facility on any day onto paved public roadways/paved 

areas accessible to the public shall install, maintain, and use a rumble grate 

and wheel washer, in accordance with all of the following conditions, as 

applicable. For the purpose of this rule, a vehicle wash and/or a cosmetic 

wash may be substituted for a wheel washer, provided such vehicle wash 

and/or cosmetic wash has at least 40 pounds per square inch (psi) water 

spray from the nozzle (owner and/or operator of the facility shall have a 

water pressure gauge available on-site to allow verification of such water 

pressure), meets the definition of wheel washer (i.e., is capable of washing 

the entire circumference of each wheel of the vehicle), is operated in such 

a way that visible deposits are removed from the entire circumference of 

each wheel of the vehicle exiting the wash, is installed, maintained, and 

used in accordance with criteria in Section 307.6(a)(1)-(5) of this rule, and 

is approved in the Dust Control Plan for the facility. 

(1) The owner and/or operator of a facility shall locate a rumble grate 

within 10 feet from a wheel washer. 

(a) The rumble grate and wheel washer shall be located no less 

than 30 feet prior to each exit that leads to a paved public 

roadway/paved area accessible to the public and that is 

used by aggregate trucks, mixer trucks, and/or batch trucks. 

(b) The owner and/or operator of a facility may be allowed to 

install a rumble grate and wheel washer less than 30 feet 

prior to each exit if the owner and/or operator of a facility 

can demonstrate to the Control Officer that there is not 

adequate space to install a rumble grate and wheel washer 

no less than 30 feet prior to each exit and that a rumble 

grate and wheel washer at a shorter distance will be 

adequate to prevent trackout. 

(c) A rumble grate shall consist of raised dividers (rails, pipes, 

or grates) a minimum of three inches tall, six inches apart, 

and 20 feet long, to allow a vibration to be produced such 

that dust is shaken off the wheels of a vehicle as the entire 

316.24
circumference of each wheel of the vehicle passes over the 

rumble grate. 

(2) The owner and/or operator of a facility shall ensure that all 

aggregate trucks, mixer trucks, and/or batch trucks exit the facility 

via the rumble grate first and then the wheel washer. 

(3) The owner and/or operator of a facility shall post a sign by the 

rumble grate and wheel washer to designate the speed limit as 5 

miles per hour. 

(4) The owner and/or operator of a facility shall pave the roads from 

the rumble grate and wheel washer to the facility exits leading to 

paved public roadways/paved areas accessible to the public. 

(5) The owner and/or operator of a facility shall ensure that all 

aggregate trucks, mixer trucks, and/or batch trucks remain on the 

paved roads between the rumble grate and wheel washer and the 

facility exits leading to paved public roadways/paved areas 

accessible to the public. 

b. Rumble Grate, Wheel Washer, Or Truck Washer: The owner and/or 

operator of a facility not subject to Section 307.6(a) of this rule shall 

install, maintain, and use a rumble grate, wheel washer, or truck washer in 

accordance with all of the following: 

(1) A rumble grate, wheel washer, or truck washer shall be located no 

less than 30 feet prior to each exit that leads to a paved public 

roadway/paved area accessible to the public and that is used by 

aggregate trucks, mixer trucks, and/or batch trucks. 

(a) The owner and/or operator of a facility may be allowed to 

install a rumble grate, wheel washer, or truck washer less 

than 30 feet prior to each exit if the owner and/or operator 

of a facility can demonstrate to the Control Officer that 

there is not adequate space to install a rumble grate, wheel 

washer, or truck washer no less than 30 feet prior to each 

exit and that a rumble grate, wheel washer, or truck washer 

at a shorter distance will be adequate to prevent trackout. 

(b) A rumble grate shall consist of raised dividers (rails, pipes, 

or grates) a minimum of three inches tall, six inches apart, 

and 20 feet long, to allow a vibration to be produced such 

that dust is shaken off the wheels of a vehicle as the entire 

316.25
circumference of each wheel of the vehicle passes over the 

rumble grate. 

(2) The owner and/or operator of a facility shall ensure that all 

aggregate trucks, mixer trucks, and/or batch trucks exit the facility 

via a rumble grate, wheel washer, or truck washer. 

(3) The owner and/or operator of a facility shall post a sign by the 

rumble grate, wheel washer, or truck washer to designate the speed 

limit as 5 miles per hour. 

(4) If haul/access roads are unpaved between the rumble grate, wheel 

washer, or truck washer and the facility exits leading to paved 

public roadways/paved areas accessible to the public, a gravel pad 

shall be installed, maintained, and used from the rumble grate, 

wheel washer, or truck washer to such paved public 

roadways/paved areas accessible to the public in accordance with 

all of the following: 

(a) Gravel pad shall be designed with a layer of washed gravel, 

rock, or crushed rock that is at least one inch or larger in 

diameter and 6 inches deep, 30 feet wide, and 50 feet long 

and shall be flushed with water or completely replaced as 

necessary to comply with the trackout threshold described 

in Section 307.6(d) of this rule. 

(b) Gravel pad shall have a gravel pad stabilizing 

mechanism/device (i.e., curbs or structural devices along 

the perimeter of the gravel pad) and shall be flushed with 

water or completely replaced as necessary to comply with 

the trackout threshold described in Section 307.6(d) of this 

rule. 

c. Exemptions for Wheel Washers: The owner and/or operator of a facility 

shall not be required to install, maintain, and use a wheel washer, if any 

one of the following are applicable: 

(1) A facility has all paved roads and meters aggregate or related 

materials directly to a ready-mix or hot mix asphalt truck, with the 

exception of returned products. The owner and/or operator of the 

facility shall install, maintain, and use a rumble grate in 

compliance with Section 307.6(b) of this rule. 

(2) A facility is less than 5 acres in land size and handles recycled 

asphalt and recycled concrete exclusively. The owner and/or 

operator of the facility shall install, maintain, and use a rumble 

316.26
grate in compliance with Section 307.6(b) of this rule and shall 

install a gravel pad in compliance with Section 307.6(b)(4) of this 

rule on all unpaved roads leading to the facility exits leading to 

paved public roadways/paved areas accessible to the public. 

(3) A facility has a minimum of 1⁄4 mile paved roads leading from a 

rumble grate to the facility exits leading to paved public 

roadways/paved areas accessible to the public. 

(4) A facility meets the definition of infrequent operations, as defined 

in Section 229 of this rule. The owner and/or operator of the 

facility shall install, maintain, and use a rumble grate in 

compliance with Section 307.6(b) of this rule and shall install a 

gravel pad in compliance with Section 307.6(b)(4) of this rule. The 

gravel pad shall be installed for a distance of no less than 100 feet 

from the rumble grate to the facility exits leading to paved public 

roadways/paved areas accessible to the public. The owner and/or 

operator of the facility shall keep records in accordance with 

Section 500 of this rule, as applicable. The owner and/or operator 

of the facility shall notify the Control Officer in the event that the 

facility will operate more than 52 days per year based on the 

average rolling 3-year period after June 8, 2005 and the owner 

and/or operator of the facility shall comply with Section 307.6 of 

this rule, as applicable. 

d. Trackout Distance: An owner and/or operator of a facility shall not allow 

trackout to extend a cumulative distance of 25 linear feet or more from all 

facility exits onto paved areas accessible to the public. Notwithstanding 

the proceeding, the owner and/or operator of a facility shall clean up all 

other trackout at the end of the workday. 

e. Cleaning Paved Roads Identified In The Dust Control Plan: The 

owner and/or operator of a facility shall clean all paved roads identified in 

the Dust Control Plan for a facility in accordance with all of the following 

as applicable: 

(1) The owner and/or operator of a facility with a minimum of 60 

aggregate trucks, mixer trucks, and/or batch trucks exiting the 

facility on any day shall sweep the paved roads with a street 

sweeper by the end of each production work shift, if there is 

evidence of dirt and/or other bulk material extending a cumulative 

distance of 12 linear feet or more on any paved road. 

(2) The owner and/or operator of a facility with less than 60 aggregate 

trucks, mixer trucks, and/or batch trucks exiting the facility on any 

day shall sweep the paved roads with a street sweeper by the end 

316.27
of every other work day. On the days that paved roads are not 

swept, the owner and/or operator of a facility shall apply water on 

at least 100 feet of paved roads or the entire length of paved roads 

leading to an exit to paved public roadways/paved areas accessible 

to the public, if such roadways are less than 100 feet long. 

(3) The owner and/or operator of a facility, who purchases street 

sweepers after June 8, 2005, shall purchase street sweepers that 

meet the criteria of PM10-efficient South Coast Air Quality 

Management Rule 1186 certified street sweepers. 

(4) The owner and/or operator of a new facility shall use South Coast 

Air Quality Management Rule 1186 certified street sweepers to 

sweep paved roads. 

307.7 Pad Construction For Processing Equipment: The owner and/or operator of a 

facility shall implement, maintain, and use fugitive dust control measures during 

the construction of pads for processing equipment, so as to meet all of the 

applicable requirements in this rule, and shall identify, in the Dust Control Plan, 

such fugitive dust control measures. 

307.8 Spillage: In addition to complying with the fugitive dust emission limitations 

described in Section 306 of this rule and implementing fugitive dust control 

measures described in Section 307.1 through Section 307.9 of this rule, as 

applicable, the owner and/or operator of a facility shall implement the following 

fugitive dust control measures, as applicable, when spillage occurs: 

a. Promptly remove any pile of spillage on paved haul/access roads/paved 

roads; or 

b. Maintain in a stabilized condition any pile of spillage on paved 

haul/access roads/paved roads and remove such pile by the end of each 

day; and 

c. Maintain in a stabilized condition all other piles of spillage with dust 

suppressants until removal. 

307.9 Night-Time Operations: The owner and/or operator of a facility shall 

implement, maintain, and use fugitive dust control measures at night, as approved 

in the Dust Control Plan. 

308 FACILITY INFORMATION SIGN: The owner and/or operator of a facility subject to 

this rule shall erect and maintain a facility information sign at the main entrance such that 

members of the public can easily view and read the sign at all times. Such sign shall have 

a white background, have black block lettering that is at least four inches high, and shall 

contain at least all of the following information: 

316.28
308.1 Facility name and permittee’s name; 

308.2 Current number of the air quality permit or of authority to operate under a general 

permit; 

308.3 Name and local phone number of person(s) responsible for dust control matters; 

and 

308.4 Text stating: “Dust complaints? Call Maricopa County Air Quality Department - 

(Insert the accurate Maricopa County Air Quality Department complaint line 

telephone number).” 

309 FUGITIVE DUST CONTROL TECHNICIAN: The owner and/or operator of a 

facility with a rated or permitted capacity of 25 tons or more of material per hour or with 

five acres or more of disturbed surface area subject to a permit, whichever is greater, 

shall have in place a Fugitive Dust Control Technician, who shall meet all of the 

following qualifications: 

309.1 Be authorized by the owner and/or operator of the facility to have full authority to 

ensure that fugitive dust control measures are implemented on-site and to conduct 

routine inspections, recordkeeping, and reporting to ensure that all fugitive dust 

control measures are installed, maintained, and used in compliance with this rule. 

309.2 Be trained in accordance with the Comprehensive Dust Control Training Class 

conducted or approved by the Control Officer, successfully complete, at least 

once every three years, such Comprehensive Dust Control Training Class, and 

have a valid dust training certification identification card readily accessible onsite while acting as a Fugitive Dust Control Technician. 

309.3 Be authorized by the owner and/or operator of the facility to install, maintain, and 

use fugitive dust control measures, deploy resources, and shutdown or modify 

activities as needed. 

309.4 Be on-site at all times during primary dust generating operations related to the 

purposes for which the permit was obtained. 

309.5 Be certified to determine opacity as visible emissions in accordance with the 

provisions of the EPA Method 9 as specified in 40 CFR, Part 60, Appendix A. 

309.6 Be authorized by the owner and/or operator of the facility to ensure that the site 

superintendent or other designated on-site representative of the owner and/or 

operator of the facility and water truck and water pull drivers for each site be 

trained in accordance with the Basic Dust Control Training Class conducted or 

approved by the Control Officer with jurisdiction over the site and successfully 

complete, at least once every three years, such Basic Dust Control Training Class. 

316.29
310 BASIC DUST CONTROL TRAINING CLASS: 

310.1 At least once every three years, the site superintendent or other designated on-site 

representative of the permit holder, if present at a site that has more than one acre 

of disturbed surface area that is subject to a permit issued by the Control Officer 

requiring control of PM10 emissions from dust generating operation, shall 

successfully complete a Basic Dust Control Training Class conducted or approved 

by the Control Officer. 

310.2 At least once every three years, water truck and water-pull drivers shall 

successfully complete a Basic Dust Control Training Class conducted or approved 

by the Control Officer. 

310.3 All persons having successfully completed training during the 2006 and 2007 

calendar years shall be deemed to have satisfied the requirement to successfully 

complete the Basic Dust Control Training Class, if the training that was 

completed was conducted or approved by the Control Officer. Completion of the 

Comprehensive Dust Control Training Class, as required in Section 309.2 of this 

rule, shall satisfy the requirement of this section of this rule. 

311 DUST CONTROL PLAN: 

311.1 The owner and/or operator of a facility shall submit, to the Control Officer, a Dust 

Control Plan that describes all fugitive dust control measures to be implemented, 

in order to comply with Section 305.2, Section 306, Section 307, and Section 309 

of this rule. 

311.2 The owner and/or operator of a facility shall submit, to the Control Officer, a Dust 

Control Plan that describes all equipment associated with any process fugitive 

emissions to be implemented, in order to comply with Section 301 and Section 

305.2 of this rule and that includes all of the information in Section 311.2(a) and 

Section 311.2(b) of this rule, as applicable. If an alternative plan for conducting 

required soil moisture tests is approved by the Control Officer, included in a Dust 

Control Plan, and implemented by the owner and/or operator, as allowed under 

Section 301.2(c)(6) of this rule, and if the Control Officer determines that such 

alternative plan included in a Dust Control Plan has been followed, yet fugitive 

dust emissions still exceed the standards of this rule, then the Control Officer shall 

issue a written notice to the owner and/or operator explaining such determination. 

The owner and/or operator shall make written revisions to the Dust Control Plan 

and shall submit such revised Dust Control Plan to the Control Officer within 

three working days of receipt of the Control Officer’s written notice, unless such 

time period is extended by the Control Officer, upon request, for good cause. 

During the time that such owner and/or operator is preparing revisions to the Dust 

Control Plan, such owner and/or operator must still comply with all requirements 

of this rule. 

316.30
a. Documentation for the soil moisture content in order to comply with 

Section 301.2 of this rule. 

b. Documentation of soil moisture analysis for each move notice regarding 

portable sources. 

311.3 The Dust Control Plan shall, in addition, contain all the information described in 

Rule 310-Fugitive Dust From Dust Generating Operations of these rules. 

311.4 All other criteria associated with the Dust Control Plan shall meet the criteria 

described in Rule 310-Fugitive Dust From Dust Generating Operations of these 

rules. 

311.5 The Control Officer shall approve, disapprove, or conditionally approve the Dust 

Control Plan, in accordance with the criteria used to approve, disapprove or 

conditionally approve a permit. Failure to comply with the provisions of an 

approved Dust Control Plan shall be deemed a violation of this rule. 

311.6 With each move notice regarding portable sources, the owner and/or operator of a 

facility shall submit, to the Control Officer, a Dust Control Plan that meets the 

requirements of this section of this rule. 

312 GENERAL REQUIREMENTS: An owner and/or operator of a facility subject to this 

rule shall be subject to the standards and/or requirements of this rule at all times. Failure 

to comply with any one of the following requirements shall constitute a violation.

312.1 Process emission limitations and controls described in Section 301, Section 302, 

and Section 303 of this rule. 

312.2 Operation and maintenance (O&M) plan requirements for an emission control 

system and for dust control measures described in Section 305 of this rule. 

312.3 Fugitive dust emission limitations described in Section 306 of this rule. 

312.4 Fugitive dust control measures described in Section 307 of this rule. 

312.5 Facility information sign requirement described in Section 308 of this rule. 

312.6 Fugitive Dust Control Technician requirements described in Section 309 of this 

rule. 

312.7 Basic Dust Control Training Class requirements described in Section 310. 

312.8 Dust Control Plan requirements described in Section 311 of this rule. 

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312.9 Monitoring and recordkeeping requirements described in Section 500 of this rule. 

312.10 Any other requirements of this rule. 

SECTION 400 - ADMINISTRATIVE REQUIREMENTS 

401 COMPLIANCE SCHEDULE: The newly amended provisions of this rule shall become 

effective upon adoption of this rule except as follows: 

401.1 Process Controls: Process controls required by Section 301.2 of this rule shall be 

implemented by July 12, 2008. 

401.2 O&M Plan: 

a. The owner and/or operator of an existing facility shall revise/update all 

O&M Plans by June 12, 2008. 

b. The Control Officer shall take final action on an O&M Plan 

revision/update to address the newly amended provisions of this rule 

within 30 calendar days of the filing of the complete O&M Plan 

revision/update. The Control Officer shall notify the applicant in writing 

of his approval or denial. 

401.3 Dust Control Plan: 

a. The owner and/or operator of an existing facility shall revise/update all 

Dust Control Plans by June 12, 2008. 

b. The owner and/or operator of a new facility shall submit to the Control 

Officer a Dust Control Plan at the time such owner and/or operator 

submits a permit application to the Control Officer. 

c. The Control Officer shall take final action on a Dust Control Plan 

revision/update to address the newly amended provisions of this rule 

within 30 calendar days of the filing of the complete Dust Control Plan 

revision/update. The Control Officer shall notify the applicant in writing 

of his approval or denial. 

401.4 Basic Dust Control Training Class: No later than December 31, 2008, a site 

superintendent or other designated on-site representative of the permit holder, 

water truck drivers, and water pull drivers shall have successfully completed the 

Basic Dust Control Training Class, as described in Section 310 of this rule. 

401.5 Comprehensive Dust Control Training Class: No later than June 30, 2008, a 

Fugitive Dust Control Technician shall have successfully completed the 

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Comprehensive Dust Control Training Class, as described in Section 309 of this 

rule. 

401.6 Rumble Grates: As of June 12, 2008, new rumble grates or existing rumble 

grates that are moved or modified must meet the requirements described in 

Sections 307.6(a)(1)(c) or 307.6(b)(1)(b) of this rule. 

SECTION 500 - MONITORING AND RECORDS 

501 MONITORING, RECORDKEEPING AND REPORTING: Any owner and/or 

operator of a facility subject to this rule shall comply with the following requirements. 

Records shall be retained for five years and shall be made available to the Control Officer 

upon request. 

501.1 Operational information required by this rule shall be kept in a complete and 

consistent manner on-site and be made available without delay to the Control 

Officer upon request. 

501.2 Records of the following process and operational information, as applicable, are 

required: 

a. General Data: Daily records shall be kept for all days that a facility is 

actively operating. Records shall include all of the following: 

(1) Hours of operation; 

(2) Type of batch operation (wet, dry, central); 

(3) Throughput per day of basic raw materials including sand, 

aggregate, cement (tons/day); 

(4) Volume of concrete produced per day (cubic yards/day) and 

volume of asphaltic concrete produced per day (tons/day); 

(5) Volume of aggregate mined per day (tons per day); and 

(6) Amount of each basic raw material including sand, aggregate, 

cement, fly ash delivered per day (tons/day). 

(7) For facilities that assert to be below the thresholds in Section 

307.6(a) and Section 307.6(e)(1) of this rule, number of aggregate 

trucks, mixer trucks, and/or batch trucks exiting the facility. 

b. Additional Data For Dry Mix Concrete Plants And/Or Bagging 

Operations: Records shall include all of the following: 

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(1) Number of bags of dry mix produced; 

(2) Weight (size) of bags of dry mix produced; 

(3) Kind and amount of fuel consumed in dryer (cubic feet/day or 

gallons/day); and 

(4) Kind and amount of any back-up fuel, if any. 

c. Control And Monitoring Device Data: Records shall include all of the 

following: 

(1) For a fabric filter baghouse: 

(a) Date of inspection; 

(b) Date and designation of bag replacement; 

(c) Date of service or maintenance related activities; and 

(d) Time, date, and cause of fabric filter baghouse failure 

and/or down time, if applicable. 

(2) For a scrubber: 

(a) Date of service or maintenance related activities; 

(b) Liquid flow rate; 

(c) Other operating parameters that need to be monitored to 

assure that the scrubber is functioning properly and 

operating within design parameters; and 

(d) Time, date, and cause of scrubber failure and/or down time, 

if applicable. 

(3) For watering systems (e.g., spray bars or an equivalent control): 

(a) Date, time, and location of each moisture sampling point; 

and 

(b) Results of moisture testing. 

501.3 O&M Plan Records: An owner and/or operator of a facility shall maintain all of 

the following records in accordance with an approved O&M Plan: 

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a. For Any ECS, Any Other Emission Processing Equipment, And Any 

ECS Monitoring Devices That Are Used Pursuant To This Rule Or To 

An Air Pollution Control Permit: 

(1) Periods of time that an approved ECS is operating to comply with 

this rule; 

(2) Periods of time that an approved ECS is not operating; 

(3) Flow rates; 

(4) Pressure drops; 

(5) Other conditions necessary to determine if the approved ECS is 

functioning properly; 

(6) Results of visual inspections; and 

(7) Correction action taken, if necessary. 

b. For Equipment Associated With Any Process Fugitive Emissions And 

Any Fugitive Dust Control Measures That Are Implemented To 

Comply With This Rule Or To An Air Pollution Control Permit: 

(1) A written record of self-inspection on each day that a facility is 

actively operating. Self-inspection records shall include daily 

inspections or in compliance with O&M Plan requirements, 

whichever is more frequent; 

(2) Maintenance of street sweepers; and 

(3) Maintenance of trackout control devices, gravel pads, wheel 

washers, and truck washers. 

501.4 Dust Control Plan Records: An owner and/or operator of a facility shall 

compile, maintain, and retain a written record of self-inspection of all fugitive 

dust control measures implemented, in order to comply with the Dust Control 

Plan, on each day that the facility is actively operating. Self-inspection records 

shall include information as described in Rule 310-Fugitive Dust From Dust 

Generating Operations of these rules. 

501.5 Basic Dust Control Training Class Records: An owner and/or operator of a 

facility shall compile, maintain, and retain a written record for each employee 

subject to Section 310 of this rule. Such written records shall include the name of 

the employee, the date of the Basic Dust Control Training Class that such 

316.35
employee successfully completed, and the name of the agency/representative who 

conducted such class. 

502 COMPLIANCE DETERMINATION - FOR PROCESS EMISSIONS AND 

CONTROLS: Compliance determinations for activities regulated by Sections 301 

(excluding Section 301.1(e)), 302, and/or 303 of this rule shall be made according to the 

test methods for those subparts of 40 CFR Part 60, Appendix A, adopted as of July 1, 

2007, as listed below. Such subparts of 40 CFR Part 60, Appendix A, adopted as of July 

1, 2007 and 40 CFR Part 51, Appendix M, adopted as of July 1, 2007, are adopted by 

reference as indicated. This adoption by reference includes no future editions or 

amendments. Copies of test methods referenced in Section 502 of this rule are available 

at Maricopa County Air Quality Department, 1001 North Central Avenue, Phoenix, 

Arizona, 85004-1942. When more than one test method is permitted for a compliance 

determination, then an exceedance of the limits established in this rule, determined by 

any of the applicable test methods, constitutes a violation of this rule. 

502.1 Grain Loading: Particulate matter and associated moisture content shall be 

determined using the applicable EPA Reference Methods 1 through 5, 40 CFR 

Part 60, Appendix A. 

502.2 Opacity Observations: Opacity observations to measure visible emissions from 

activities regulated by Sections 301 (excluding Section 301.1(e)), 302, and/or 303 

of this rule shall be conducted in accordance with the techniques specified in EPA 

Reference Method 203B (Visual Determination Of Opacity Of Emissions From 

Stationary Sources For Time-Exception Regulations), 40 CFR Part 51, Appendix 

M, adopted as of July 1, 2007. Emissions shall not exceed the applicable opacity 

standards described in Section 301(excluding Section 301.1(e)), Section 302, and 

Section 303 of this rule for a period aggregating more than three minutes in any 

60-minute period. 

502.3 Soil Moisture Testing For Watering Systems: 

a. If twice daily moisture sampling is required, such sampling shall be 

conducted within one hour of startup and again at 3 pm or within one hour 

prior to daily shutdown but no less frequently than once every 8-hour 

period. 

b. If daily moisture sampling is required, such sampling shall be conducted 

within one hour after startup. 

c. Moisture testing shall be conducted on all crushers, shaker screens, and 

material transfer points (excluding wet plants). Unless prior approval from 

the Control Officer is granted, moisture testing shall be conducted at the 

following sample points: 

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(1) Within 10 feet from the point where crushed aggregate material is 

placed on the discharge belt conveyor from the crusher; 

(2) Within 10 feet from the point where screened aggregate material is 

placed on the conveyor; and 

(3) From each stacker point. 

d. The number of sampling points identified in Section 502.3(c)(1) through 

(3) of this rule may be reduced, if the owner and/or operator of a facility 

complies with all of the following requirements: 

(1) A 5% minimum moisture content, as demonstrated by a soil 

moisture test conducted in accordance with the test methods 

described in Section 502 of this rule, is maintained at the primary 

crusher; 

(2) A minimum of 20 soil moisture samples are taken at all of the 

points identified in Section 502.3(c) of this rule; 

(3) A 4% minimum moisture content, as demonstrated by a soil 

moisture test conducted in accordance with the test methods 

described in Section 502 of this rule and as demonstrated by the 

soil moisture samples required by Section 502.3(d)(2) of this rule, 

is maintained at all of the points identified in Section 502.3(c) of 

this rule; and 

(4) A written request is submitted to and approved by the Control 

Officer to revise/modify the Dust Control Plan to reflect the 

change in moisture content and the reduced number of sampling 

points according to the demonstration made by the owner and/or 

operator of a facility according to this section of this rule. 

e. Moisture testing is not required on a crusher and/or screen plant equipped 

with a baghouse or fabric filter, electrostatic precipitator, or wet scrubber, 

excluding wet spray bars, for control of particulate matter. 

f. Moisture testing shall include all aggregate material less than 0.25 inch in 

diameter. 

g. Moisture testing shall be conducted in accordance with the requirements 

of American Society For Testing And Materials C566-97 (2004) 

“Standard Test Method For Total Evaporable Moisture Content Of 

Aggregate By Drying” with the exception that smaller sample portions 

may be used. 

316.37
503 COMPLIANCE DETERMINATION FOR EMISSIONS AND CONTROLS THAT 

ARE REGULATED BY SECTION 301.1(E), SECTION 304 AND/OR SECTION 

306 OF THIS RULE: To determine compliance with the fugitive dust emission 

limitations described in Section 301.1(e), Section 304, and/or Section 306 of this rule, 

opacity observations shall be conducted in accordance with the techniques specified in 

Appendix C-Fugitive Dust Test Methods of these rules. 

504 COMPLIANCE DETERMINATION FOR SOIL MOISTURE CONTENT AND 

SOIL COMPACTION CHARACTERISTICS TEST METHODS ADOPTED BY 

REFERENCE: 

504.1 ASTM Method D2216-05 ("Standard Test Method for Laboratory Determination 

of Water (Moisture) Content of Soil and Rock by Mass"), 2005 edition. 

504.2 ASTM Method D1557-02e1 ("Test Method for Laboratory Compaction 

Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3

 (2,700 kNm/m3

))"), 2002 edition. 

505 COMPLIANCE DETERMINATION FOR STABILIZATION STANDARDS TEST 

METHODS ADOPTED BY REFERENCE: The stabilization standards described in 

Section 306.5 of this rule shall be determined by using the following test methods in 

accordance with Appendix C-Fugitive Dust Test Methods of these rules: 

505.1 Appendix C, Section 2.1.2 (Silt Content Test Method) of these rules to estimate 

the silt content of the trafficked parts of unpaved roads (not to exceed 6%) and 

unpaved parking lots (not to exceed 8%). 

505.2 Appendix C, Section 2.3 (Test Methods for Stabilization-Soil Crust 

Determination (The Drop Ball Test)) of these rules for a soil crust. 

505.3 Appendix C, Section 2.4 (Test Methods for Stabilization-Determination Of 

Threshold Friction Velocity (TFV) (Sieving Field Procedure)) of these rules for 

threshold friction velocity (TFV) corrected for non-erodible elements of 100 

cm/second or higher. 

505.4 Appendix C, Section 2.5 (Test Methods For Stabilization-Determination Of Flat 

Vegetative Cover) of these rules for flat vegetation cover (i.e., attached (rooted) 

vegetation or unattached vegetative debris lying on the surface with a 

predominant horizontal orientation that is not subject to movement by wind) that 

is equal to at least 50%. 

505.5 Appendix C, Section 2.6 (Test Methods For Stabilization-Determination Of 

Standing Vegetative Cover) of these rules for standing vegetation cover (i.e., 

vegetation that is attached (rooted) with a predominant vertical orientation) that is 

equal to or greater than 30%. 

316.38
316.39

505.6 Appendix C, Section 2.6 (Test Methods For Stabilization-Determination Of 

Standing Vegetative Cover) of these rules for standing vegetation cover (i.e., 

vegetation that is attached (rooted) with a predominant vertical orientation) that is 

equal to or greater than 10% and where the threshold friction velocity is equal to 

or greater than 43 cm/second when corrected for non-erodible elements. 

505.7 Appendix C, Section 2.7 (Test Methods For Stabilization-Rock Test Method) of 

these rules for a percent cover that is equal to or greater than 10%, for nonerodible elements. 

505.8 An alternative test method approved in writing by the Control Officer and the 

Administrator. 

506 CERTIFIED STREET SWEEPING EQUIPMENT LIST ADOPTED BY 

REFERENCE: The list of street sweeping equipment (as of July 9, 2004) that has met 

the South Coast Air Quality Management Rule 1186 certification standards is found in 

support documents for the South Coast Air Quality Management District Regulation XISource Specific Standards, Rule 1186-PM10 Emissions From Paved And Unpaved Roads 

And Livestock Operations and is adopted by reference. A copy of the list of certified 

street sweeping equipment can also be obtained at Maricopa County Air Quality 

Department, 1001 North Central Avenue, Phoenix, Arizona, 85004.