Quality, Service & Commitment


  • 22 Jan 2018

    Civil Engineer Needed

  • 08 Dec 2017

    INTERRA Honored With 2017 IRTBA Green Industry Achievement Award For Green Initiatives

  • 26 Oct 2017

    INTERRA To Host Ribbon Cutting With Bolingbrook Mayor Celebrating Going Green

More News


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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Various Projects – City of Chicago

INTERRA Services Geotechnical Field Inspection and Testing

Concrete Plant and Field   Inspections

Hot-Mix-Asphalt (HMA) Plant and Field Inspection

Pavement Coring and testing

Laboratory testing of Asphalt Mixes

Laboratory testing of Concrete samples

Laboratory testing of Soil samples

Annual QC/QA review meetings are being conducted at our   facilities

Construction Inspection for ADA Ramps


Project Summary

Since 2003, INTERRA has been providing quality assurance testing and inspection of materials on various City of Chicago projects including Arterial, 50/50 sidewalk program, water Management projects. INTERRA’s services consisted of QA inspection at concrete and asphalt plants, soils and aggregate inspection and field inspections involving asphalt density testing and concrete testing.  Over 250 projects under the QC/QA construction Engineer Contract Spec. No. 21694 were covered. QA services were provided for various bridges over I-90/94 under the Expressway Viaduct Program. Provided testing and inspection services for ADA Ramps program.