Concrete Batch Plants, Mixers, and Cement/Ash Storage Silos
Concrete batch plants and associated equipment including mixers and
cement/ash storage silos emit air contaminants including particulate
matter and toxic air contaminants. Stationary concrete batch plants
and portable plants that do not meet the regulatory definition of
portable require a permit to operate. For information on registering a
portable concrete batch plant, please see the District's registration
Concrete batch plants typically consist of equipment to store and
transfer aggregate and cement to the plant, all transfer screws,
conveyers, hoppers and mixers included in the plant and equipment used
to transfer the mixture of aggregate and cement to trucks for
transport or other method of loadout. Cement storage silos and mixers
not associated with a batch plant also require separate permits.
Particulate (dust) emissions generated from this equipment are
typically controlled by enclosing the process, using wet material or
adding water or venting any emissions generated through a dust
collector or other fabric filter.
The information on this page will assist in the completion and
submittal of an application for each concrete batch plant. Each
section of the page contains important information needed to submit an application.
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
Concrete Batch Plant Supplemental Form Word PDF
Plot Plan including stack and/or other release point location(s)
and nearby building dimensions
Equipment brochures/process flow diagram
Bag-house/filter specifications and control efficiency (if applicable)
BACT analysis (if applicable)
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
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 concrete batch plants, this requirement is typically
triggered by PM10. Please note that the 10 pounds per day threshold is
based on emissions for the entire process line including fugitive
emissions from haul roads and storage piles.
The District has a
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
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 concrete batch plant 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, the
emissions do not initial pass a health risk assessment (HRA), or if
sufficient supporting information is not included with the
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.
Concrete batch plants and related equipment are not subject to these rules.
Several District rules may apply to your equipment. General rules
that may apply to concrete batch plants and related equipment include
Rules 50, 51, 52,
There are no equipment specific rules for concrete batch plants. 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 associated with the process that
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. Emission factors
for concrete batching can be found in this resource.
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