Sand, Rock and Aggregate Processing
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.
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
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 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)
-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
-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
The general and equipment specific application forms along with
required attachments must be submitted with each application
Top of Page
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.
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 2.2% that is charged by the credit card provider.
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
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.
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
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
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.
How to Submit Application Packet
10124 Old Grove Rd
San Diego, CA 92131-1649
Select equipment type applications can now be submitted online
Access. Sign up today to get connected to your applications and permits.
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
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.
more about the application process and what to expect.
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.
Several District rules may apply to your equipment. General rules
that may apply to this equipment include Rules 50, 51, 52,
There are no equipment specific rules for this equipment. A complete
listing of the District's rules can be found here.
Calculation Procedures and Additional Resources
Road Calculation Procedures - This page contains procedures that
should be used to calculate emissions from any of the plant's haul
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.
Need Help? Have Questions?
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