Materials – Quality

“We have modern, fully-equipped labs at both our Sunol and Oakland hot plants that we are able to staff and operate simultaneously on a 24/7 basis.   This makes us uniquely capable of servicing even the most demanding airport and freeway paving projects in the San Francisco Bay Area.”

Tracey Zubek, Quality Control Manager

Our materials undergo numerous tests in our certified laboratories to ensure that our products meet the customers' needs as well as exceed Federal, State, & Local specification requirements.

Each of our labs are National Accredited through AASHTO Materials Reference Laboratory (AMRL) which includes an extensive review or our laboratory technicians. Our Laboratory Technicians have accreditations in:

  • Caltrans
  • American Association of State Highway and Transportation Officials (AASHTO)
  • American Society for Testing Materials (ASTM)
  • National Institute for Certification in Engineering Technologies (NICET)
  • Nuclear Gauge Safety


The laboratories are capable of full phase Rock and HMA testing. We have equipment to run all Marshall, HVEEM and SUPERPAVE testing including the Hamburg Wheel Track (HWT).

We also work with other laboratories to ensure the quality of our testing.

The combination of quality reserves, modern manufacturing techniques and certified testing facilities and technicians demonstrates DeSilva Gates Aggregates’ commitment to the production of quality aggregate and asphalt materials for the Northern California construction community. Our goal is to be the preferred source of aggregates and asphalt materials.