Aggregate Prequalification Program


The Aggregate Prequalification Program (APP) has been developed to provide contractors the ability to submit aggregate for quality assurance testing by Caltrans before the award of construction contracts. It is intended to reduce costs, delays, and additional liquidated damage payments to Caltrans associated with prequalification testing during the construction phase and allows Caltrans to achieve the goal of developing additional project delivery efficiencies as specified in SB 1.

The program is managed by Caltrans, Division of Engineering Service (DES), Materials Engineering and Testing Services (METS), Office of Central Laboratories (OCL), and the Aggregate Materials Testing Branch (AMTB).

Program Requirements

Requests for aggregate to be verified under the APP are addressed in the order in which a complete submittal has been received. The general process is identified below:

  1. Aggregate producers must submit quality control data onto the Data Interchange for Materials Engineering (DIME) database.
  2. The APP Administrator will review the submitted package for technical content and request additional information as needed.
  3. After review, the APP Administrator will contact the aggregate producer and request a split sample of material to be shipped to a Department Laboratory.
  4. Once the submittal has been reviewed and material has been quality assurance tested, the APP administrator will e-mail the producer an acceptance notification valid for up to one year or a rejection notification.
  5. If accepted, the material will be placed on the Aggregate Prequalification Program List.

For full details and procedures on the submittal process, refer to the Authorization Criteria (PDF).

The Department retains the right to inspect, sample, and test aggregate source materials for additional verification at any time.

If you have any questions regarding the APP, please contact the APP Administrator at