Quality, Service & Commitment


  • 08 May 2018

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

  • 28 Apr 2018


  • 08 Dec 2017

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

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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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With this letter we provide our confidence in INTERRA in providing comprehensive field and laboratory testing for projects involving soils investigations, design and construction monitoring … Their services are consistently ontime and within budget…

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IL Route 38 Grade Seperation, Geneva and West Chicago, IL

INTERRA Services

Quality assurance inspection and testing of materials during construction. Field and plant inspections of concrete and Hot Mix Asphalt.

Inspection and testing of Soil Subgrade and embankments. Use of Dynamic and Static Cone Penetrometers, Hand Auger and Nuclear Density/Moisture Gauge during testing.  Make recommendations to Resident Engineer, as per IDOT Standard specifications.

Mechanically Stabilized Earth Retaining Wall (MSE) – Interra’s scope includes verifying soils bearing capacity checks to ensure compliance with the design specifications and meet the minimum service loads under the MSE wall footings as well as along the wall panels. Determine the need for undercuts and provide recommendations to the Resident Engineer. Compaction testing of the select fill materials in the MSE wall area and monitor backfill materials to ensure it meets the required project specifications.

Project Summary

The project begins about 0.5 miles east of the IL 38 intersection with Kirk Road for a distance easterly of about 1.31 miles in DuPage and Kane Counties, and the Cities of Geneva and West Chicago, Illinois.  Kautz Road improvement extends northerly from IL 38 for a distance of about 0.32 miles.

This improvement includes the construction of a grade-separation structure of IL 38 over the Union Pacific Railroad with a relocated intersection of IL 38 with Kautz Road.