Quality, Service & Commitment


  • 19 Sep 2018

    INTERRA Selected As Finalist To Receive The 2018 Illinois Sustainability Award

  • 08 May 2018

    IRTBA Announces INTERRA President To Serve On Green Council Board Of Directors

  • 28 Apr 2018


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Laboratory Certifications

  • IL & WI State DOTs
  • ASTM


Firm Certifications

  • DBE with IDOT
  • MBE with City of Chicago

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U.S. Route 34 at the Canadian National (CN) Railroad Bridge Construction: “Thanks very much for a job well done throughout this entire project. Congratulations to you and your staff!” David A. Cuthbertson, PE, Senior Project Manager, Alfred Benesch & Company

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Confidence Assured.  INTERRA’s DOT, ACI, NICET and AWS certified engineering technicians, inspectors and documentation specialists coordinate with agencies, consultants, contractors, material suppliers and manufacturers to ensure that materials provided to the construction site and installed are inspected and tested at the proper frequency for compliance with project specifications.  Additionally, they routinely handle any testing needs typically encountered during construction projects.

Diverse Capabilities.  Our inspection and field testing capabilities include, but are not limited to the following:

  • Construction management and  inspection
  • Materials coordination and documentation
  • Soil excavation observations and recommendations
  • Mass earthwork monitoring
  • On-site bearing capacity determinations, soil density testing
  • Compaction testing of soils, aggregates, and asphalt
  • Piles and caissons installation monitoring and testing
  • Precast and Portland Cement Concrete (PCC) plant and field inspections
  • Hot-Mix-Asphalt (HMA) plant and field inspections
  • Prestress Concrete plant inspections
  • Masonry, mortar, and grout placement investigations and testing
  • Weld inspections
  • Structural steel non-destructive testing
  • Floor flatness testing
  • Pile load testing
  • Landfill Construction Quality Assurance (CQA)
  • Roof moisture surveys and installation observation

Staff Continuity. INTERRA’s ability to consistently deliver high-quality, value-added inspection and field testing services are directly derived from the experience, training, and long-term employment of our dedicated field staff.  We know that consistent, meaningful field services require consistent, client-focused field personnel.  With INTERRA, our clients can be confident they will get the best of the best throughout the duration of their project.