print logo
Main Content Anchor

Aggregate & Rock Crushing Operations

​​Aggregate and rock crushing operations involve the handling and processing of nonmetallic mineral products for the construction industries.  Nonmetallic mineral products are quarried or mined and are then transported to the processing plant for further classification and/or further size reduction.  In addition, some recycled aggregate products (such as concrete and asphaltic concrete) are also processed in these plants.  The processing of sand and gravel for a specific market involves the use of different combinations of washers, screens, and classifiers to segregate particle sizes; crushers to reduce oversized material; and storage and loading facilities.  The various types of equipment used in these plants include: hoppers, belt conveyors, screens, scrubbers, pumps, storage bins, crushers, jigs, screws, front end loaders, scrapers, trucks, engines, and generators.

Who Needs a Permit?

  • Any aggregate and rock crushing operation which would emit any pollutant, without the benefit of an air pollution control device, greater than or equal to 2 pounds in any 24 hours period.

  • Equipment registered under CARB's Portable Equipment Registration Program is not required to have a permit unless it is being operated as part of a stationary source as determined by Sac Metro Air District.

Permit Fees 

New Installations:  

  • Every applicant for an Authority to Construct a new aggregate and rock crushing process shall pay at least one half of the initial permit fee specified in Rule 301, Section 308 upon filing the application.  Prior to issuance of a Permit to Operate, the applicant shall pay the remaining unpaid portion of the initial permit fee, if applicable.  Permit fee for any aggregate and rock crushing process will be based on Schedule 1 (Rule 301, Section 308.2) where the rating is dependent on the cumulative total rated electrical horsepower of all motors in the equipment.

Baghouses and Internal Combustion Engines: 

  • When an aggregate and rock crushing process is permitted with a baghouse or an internal combustion engine, a separate application for Authority to Construct is required for each baghouse and each engine over 50 horsepower. 


  • For modifications of existing aggregate and rock crushing processes resulting in an increase in the motor horsepower of the aggregate plant, the fee is assessed in accordance with fee Schedule 1 (see Rule 301, Section 308.2) based on the incremental increase in horse power resulting from such change (see Rule 301, Section 306.1).

  • When an application is filed for a revision of condition on a Permit to Operate or any alteration or addition, but no increase or change is made to the motor horsepower rating of the aggregate plant, the applicant shall pay a permit fee based on Rule based on Rule 301, Section 306.2.

Permit Application Completeness Determination

An application will not be accepted for processing until it is deemed complete. The following will be required in order for the Sac Metro Air District to make a completeness determination.

  • Completed application Forms G100, G101, and HRA100 with the original signature of the owner/proprietor or responsible officer of the company.

  • Applications for baghouses and engines should be completed and submitted in accordance with their corresponding application instructions.

  • Applicable permit fee in accordance with Rule 301.

  • Any additional information that may be requested in order to perform a health risk assessment or to better understand the process or the applicability of regulations.

 Documents / Forms



G100 - General Application Form - General Application FormPermit Application Forms
G101 - General Information - General InformationPermit Application Forms
HRA100 - Health Risk Assessment Form - Health Risk Assessment FormPermit Application Forms

Related Rules

Rule Date Last Amended
Permitting Page
Back to Top