Sand, Rock and Aggregate

Sand, Rock and Aggregate Processing

(Rock Crushing/Screening/Transfer)

Sand, Rock and Aggregate Plants are operated by the mineral product industry to process sands, rocks, aggregates or recycled concrete and asphalt. The materials processed by these plants are transported to the site or are blasted from an on-site quarry. These plants typically include crushers, screens, conveyors, loadout system, stockpiles, storage bins and haul roads. Crushers used by these plants include jaw crushers, cone crushers and impact crushers. Common screen types include grizzlies, shaking or vibrating screens.

Air contaminant emitted from operations of these sand, rock and aggregate plants include particulate matter and toxic air contaminants. Particulate matter emissions are controlled by water spray, fog spray, surfactant, covered screen and covered conveyor, or by venting crushers, screens and conveyors to baghouses. Emissions from haul roads and material storage areas must also be controlled by watering or other control measure.

Sand, Rock and Aggregate

Plants are powered by electricity or by diesel engine generators. If the plant is powered by diesel engine generators and the diesel engines have their brake-horsepower rating of 50 bhp or greater, please complete the application forms for non-emergency engines.

The information on this page will assist in the completion and submittal of an application for each gas turbine. Each section of the page contains important information needed to submit an application. 

Portable equipment under this category that is not operated at a stationary source may be eligible for registration instead of permitting. See the District's registration page for additional information.

Application Forms

Application forms tell us about your operation and allow us to permit your process. Accurate and complete information decreases processing time and helps avoid additional charges for unnecessary revisions. Please carefully review and complete the following forms. Also listed below are required attachments that need to be submitted with the application. You may contact the District with any questions.

General Application Word PDF

Screening Supplemental Form Word PDF (For screen sets with no associated crushers)

Load-out Only Supplemental Form Word PDF (For processes with load-out only)

Sand, Rock and Aggregate Processing Supplemental Form Word PDF (For all other equipment)

Toxics Form Word PDF

    -Facility Plot Plan including crushers, screens and conveyors locations, stockpile and storage bin locations,          haul roads, property boundary line

    -Process flow diagram including material throughput in tons per hour at each transfer point

    -Crusher and screen specification/data sheet

    -Crusher, screen and conveyor drop heights

    -Stockpile areas

    -Quarry blasting activities (if applicable), including total annual blasted amount, total annual blasted area,            horizontal area per blast, explosive type, explosive amount per blast, number of blasts per year.

    -Control equipment specifications (if applicable)

    -BACT analysis including manufacturer/supplier cost estimates (if applicable)

The general and equipment specific application forms along with required attachments must be submitted with each application packet.

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Estimated Fees

The correct fee must be submitted with your application in order for it to be accepted. For this type of equipment, fees are determined based on the time and materials required to conduct the review, so a fee estimate must be obtained from the District prior to submittal. Please note that application fees are estimated and the final fee may be more or less than this amount based on time and materials spent processing the application. The District maintains work records for this purpose.

Before submitting an application, contact the District (see bottom of page) to obtain an application fee estimate for application submittal. Please note that an additional fee may also apply depending on the method of payment. A breakdown of how the application fee(s) are determined can be seen here. Additional information can be found in District Rule 40.

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How to Pay

These fees may be paid by check payable to "Air Pollution Control District" or by credit card (Visa, MasterCard, Discover, and American Express). 

If you choose to email or fax your application and intend on paying with a credit card, you must provide contact information (name and phone number) so that the District can complete payment.

Please note that credit card payments are assessed a transaction fee of 2.19% that is charged by the credit card provider.

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Best Available Control Technology

If a piece of equipment or a process emits more than 10 pounds per day of particulate matter (PM10), oxides of nitrogen (NOx), volatile organic compounds (VOC) or oxides of sulfur (SOx), the application must include a best available control technology (BACT) analysis. For sand, rock and aggregate processing, this is typically triggered by PM10. Please note that the 10 pound per day threshold is based on emissions from the entire process line, not just a single emission point and includes fugitive sources.

The District has a BACT guide to assist with the analysis. If you have questions or need assistance reference the contact information at the bottom of this page. Please review District Rules 20.1 and 20.2

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District Rule 1200 applies to any new, relocated, or modified emission unit which may increase emissions of one or more toxic air contaminant(s). The proposed project must comply with Rule 1200. Proposed equipment may require toxics best available control technology (TBACT) depending on the project. Please review District Rule 1200 for further details. 

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Trade Secret

District rules address how information that is submitted to the District is managed. District Regulation IX contains District rules 176 and 177. Please refer directly to these rules when submitting trade secret information. However, be aware that you will need to submit:

1.       A letter disclosing the proprietary information. This can be submitted electronically.

2.       A letter for the public record explaining why the information needs to be held as trade secret.

The inclusion of proprietary information can significantly delay permit applications. In an effort to expedite the permit application process it is recommended that you contact the manufacturer or vendor of any proprietary materials that are used in the process and prepare the required letters as part of your application submittal. 

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In 1989, the California state legislature passed a law, AB 3205, designed to protect schoolchildren from hazardous air contaminants. The law, as currently written, requires the District to notify parents of schoolchildren, neighboring businesses and residents of all new or modified equipment that emits any hazardous air contaminant into the air which will be installed within 1,000 feet of a school site. The law also requires the District to consider any comments before authorizing construction. Please review your proposed location. If a school property boundary is located within 1,000 feet of the proposed emissions point, the AB3205 process will be initiated. This process requires a 30 day public comment period and the overall process will delay projects by at least six weeks.

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How to Submit Application Packet



Permit Processing

10124 Old Grove Rd

San Diego, CA 92131-1649


(858) 586-2601

Select equipment type applications can now be submitted online through Citizen Access. Sign up today to get connected to your applications and permits. 

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Application Status

The District will act on complete applications as soon as possible but at most within 180 days. The engineer assigned to your application will review it and contact you within 30 days of receipt to confirm that it is complete or request additional information. Typically permits are issued in about 60 days. More complex processes will take longer. Common reasons that sand, rock and aggregate applications may take longer than 60 days to evaluate include: if they require a mandatory public notice period due to being installed within 1000 feet of a school or triggering the requirement for a air quality impact analysis (AQIA), if they do not initially pass a health risk assessment (HRA) or AQIA, if BACT is not proposed or complete BACT analysis is not submitted, if they are major sources and actual emission data is not provided, or if the equipment layout/process flow changes during permit evaluation.

Ensuring your application is complete is the best way to reduce processing time. Complete emissions data is the most important factor in minimizing application processing time and iterative information requests. If you have any questions about what information is required, please contact the District using the information at the bottom of this page. Learn more about the rules that govern application processing time. 

Sign up for Citizen Access to get up to date information on the status of your application.

Learn more about the application process and what to expect. 

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This equipment is subject to Federal New Source Performance Standard (NSPS) subpart OOO. Requirements of this rule depend on this size of the equipment, construction date and equipment type. Screens that are not associated with a process including a crusher are not subject to the rule. Major requirements of the rule include particulate and opacity standards, monitoring and record-keeping requirements and initial testing.

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District Rules

Several District rules may apply to your equipment. General rules that may apply to this equipment include Rules 505152, and 54.

There are no equipment specific rules for this equipment. A complete listing of the District's rules can be found here.

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Calculation Procedures and Additional Resources

Haul Road Calculation Procedures - This page contains procedures that should be used to calculate emissions from any of the plant's haul roads.

Mineral Products Industry Calculation Procedures - This page contains procedures that should be used to calculate emissions from equipment such as crushers, screens, conveyers, storage piles and other mineral products industry related emissions that may occur on-site.

Use of these calculation procedures will aid in minimizing application review time and costs. The calculation procedure can be found at the link at the top of each page, and the correct emission factors selected from the list based on equipment. If available, manufacturer provided equipment specific emission data or source test results should be utilized before using default emission factors. Sources of all emission data used must be included as attachments to the application.

AP-42 - An alternative compilation of emission factors and calculation procedures prepared by the EPA that may be utilized by the District in some situations for some equipment types.

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Obtain Assistance

Need Help? Have Questions?

Email the District or call (858) 586-2600 and ask for the duty engineer.

More in depth help and site visits can be performed by the District Small Business Assistance Program Coordinator who can be reached at (858) 586-2656.

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