Our Services

Materials Testing

Construction Inspection

Materials Engineering

Design-Build QA/QC

Services

Sequoia provides comprehensive professional service solutions to achieve compliance of the quality requirements to the Contract Documents. Our service solutions for the construction industry are designed to accomplish the requirements of the quality scope through inspection of construction activities, sampling and testing of materials and materials engineering tasks. We represent our clients in both quality assurance and quality control capacities in protecting their interests.

Materials Testing

Sequoia provides both field and laboratory materials testing service solutions to the construction industry. The process starts with our Field Materials Testers conducting field sampling and testing of the materials and subsequently the Laboratory Materials Testers completing the testing of same to assure conformance to project requirements.

Sequoia maintains 12,000 SF full service laboratory and office facilities at its headquarters in Orange, CA. The facility is accredited by AASHTO Materials Reference Laboratory (AMRL) and International Accreditation Service (IAS) for ISO/IEC 17025, inspected by Cement Concrete Reference Laboratory (CCRL) and certified by Caltrans, Army Core of Engineers and the City of Los Angeles.

The laboratory houses high end testing equipment including a 500,000 Lbs. capacity Universal Test Machine capable of testing up to the largest reinforcing bar (#18/57mm); HMA Superpave equipment including Gyratory Compactor and Hamburg Wheel Track, Kneading Compactor, Coefficient of Thermal Expansion (CTE) apparatus, among others. The in-house capabilities include testing of all materials encountered in roadway and structure construction. We carry the California Profilograph for roadway pavement smoothness testing.

Sequoia maintains several mobile laboratories that are comprehensively equipped and certified for HMA and JPCP/RSC paving operations. We also have setup stationary onsite laboratory units at numerous jobsites that require quick testing turnaround times. We provide onsite laboratory facilities to any project, based on its unique requirements and circumstances.

Construction Inspection

Construction inspection forms an integral part of quality assurance and quality control aspects of a construction project. Sequoia provides comprehensive construction inspection solutions to its clients in ascertaining that all construction activities comply with the Contract Documents.

Sequoia’s inspection staff includes experienced and certified structures inspectors, roadway and civil inspectors, construction inspectors and special inspectors (ICC certified). We employ a strong veteran team of professionals with demonstrated industry excellence in all aspects of construction inspection. Sequoia’s inspectors are certified by ICC, AWS, ACI and PCI and various other jurisdictional agencies.
The inspection staff is well supported by the in house materials engineers dedicated to assure performance of each inspector as to sampling, testing and inspection responsibilities as established by the Contract Documents and as defined by applicable Codes. Each inspector emphasizes the importance of documentation, the value of traceability, and timely follow through to fulfill his or her responsibilities as a project inspector.

Sequoia’s inspection and testing staff is comprised of members of the International Union of Operating Engineers – Local 12, which holds the jurisdiction over inspection and testing field in Southern California. The signatory relationship with the Local 12 provides our clients with the added assurance of having direct access to a large pool of available qualified and certified union technicians and inspectors as well as all the services provided being in strict compliance with California prevailing wage requirements.

Materials Engineering

Sequoia offers a wide array of materials engineering service solutions to its clients. The materials engineering solutions are designed to address the client’s needs in achieving their quality responsibilities and meeting the contract requirements from the global quality perspective. Sequoia team members hold expertise in various quality disciplines and offer its clients technical recommendations and direction in finding solutions to corresponding quality issues.

Materials Engineering services provided include development of:

  • Quality Management Programs (QMP)
  • Quality Control Plans (QCP)
    • HMA & JPCP Paving
    • Welding (WQCP)
    • Rebar Splicing
  • Structural Concrete Mix Designs
  • HMA / RHMA / WMA Paving Mix Designs
  • JPCP / RSC / LCB Paving Mix Designs
  • Source Inspection Quality Management Plans (SIQMP)
  • Failure Investigations / Analyses
  • Materials Evaluation

Design-Build QA/QC

Sequoia provides comprehensive quality assurance and quality control (QA/QC) services to major design-build projects in the transportation sector through the Southern California region. Sequoia has established itself as an industry leading provider of comprehensive QA/QC testing and inspection services to major design-build projects within the transportation sector. Recognizing the framework within which the QA/QC services are implemented in the design-build delivery method, Sequoia has effortlessly adapted to methodology in assuring the uncompromised quality without impacting the construction schedule in a fast paced environment. Sequoia has been highly successful in delivering QA/QC services within the design-build framework for some of the largest and most significant projects constructed in Southern California:

  • SR-91 Corridor (RCTC) – Atkinson / Walsh / URS
  • I-15 Cajon Pass (Caltrans) – Coffman / Parsons
  • I-10 / I-605 Connector (Caltrans) – MCM / Dokken
  • I-805 North (Caltrans) – Skanska / Coffman
  • Mid City / Exposition LRT (MTA) – Flatiron / Fluor / Parsons
  • Iconic Freeway Structure on I-210 (MTA) – Skanska / AECOM
  • HOT Express Lanes on I-10 and I-110 (MTA) – Atkinson / AECOM
  • SR-125 Toll Road (Caltrans) – Washington Group / Fluor

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