Quality, Service & Commitment


  • 26 Oct 2017

    INTERRA To Host Ribbon Cutting With Bolingbrook Mayor Celebrating Going Green

  • 21 Jul 2017

    Recipient Of Service Award Thanks INTERRA for Engineering Support With Jane Byrne Circle Interchange

  • 15 Mar 2017

    INTERRA, Inc. Full-Time Field Technician Openings in Franklin, WI

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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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Great Lakes Naval Base, Great Lakes, IL: “They reacted extremely well to ever changing schedule demands and testing needs on short notice.” Joseph Albrecht, QC Manager, Blinderman Construction Company

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Systemwide Quality Assurance – Illinois State Toll Highway Authority

INTERRA Services

√  Serve as liaison to various construction managers for soils and aggregate related issues

  Attend materials and progress meetings

  Verity Quality Control (QC) testing and contractor procedures

  Perform regular QA split testing and independent tests, when necessary

  Trouble-shoot problems and provide recommendations

  Complete, review, and submit daily QA reports on PROLIANCE

  Verify QC reports and prepare comparisons

  Inform R.E. of any issues, failing tests, and corrective action taken/to be taken by the contractor

Project Summary

INTERRA was retained by the Illinois State Toll Highway Authority (ISTHA) under a Systemwide Contract to perform the above listed services and tasks for numerous highway rehabilitation projects throughout northeast Illinois. In general, INTERRA witnessed the producer’s quality control activities at required frequency and verified that the contractor’s quality plan was satisfactorily implemented. INTERRA’s work covered all project/field activities related to embankment construction, subgrade, MSE walls and aggregates such as PGE, and other aggregates produced on-site.