Materials Testing

& Inspection.

Construction Materials

Quality Assurance.

Leighton offers Materials Testing and Inspection for concrete, asphalt, and aggregate material, as well as Special Inspection for masonry, structural steel, rebar, and welding.

Our roster of experienced field technicians and cloud-based technological capabilities allow the Leighton team to confirm the quality of construction materials accurately and efficiently to meet project specifications, plans and schedule.

How do we Do it?


Field Technicians.

Our ability to solve field problems quickly and effectively keeps field costs under control, while confirming that contractors are meeting all job requirements.

Specialized Regulatory


Specific contract requirements such as Caltrans are strictly followed and documented in accordance with the Caltrans Construction Manual, and coordinated with the Resident Engineer, Caltrans, the local agency, and contractor personnel.

For decades Leighton has also worked with owners providing special CQAP inspection by certified ICC, AWS, and DSA inspectors.

Our knowledge of specific documentation such as the Form 291 and 250 for DSA projects, and submittal procedures such as the DSA Box complements our reputation for honesty, accuracy and trust.



Source inspection ensures that all material or testing is identified and then performed in accordance with written test procedures.

Leighton’s history with Caltrans as geotechnical engineers combined with our decades of transportation testing resulted in our current role providing Source Inspection Quality Management Plans for interchanges, highways, rail, and other projects under the Caltrans Local Assistance Program.