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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Chicago O’Hare Airport, Terminal 6 Project: “We would like to extend our appreciation to you and all of your employees who worked on the Terminal 6 Project.  All work was performed professionally, accurately and thoroughly. Your commitment to quality and …

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McCormick Boulevard Reconstruction Project, Evanston, IL

INTERRA Services

 Geotechnical subsurface soil exploration field inspection and testing

  Pavement section core samples

√  Laboratory testing:  moisture content, pocket penetrometer tests, unit weight,   Atterberg limits, sieve analysis, unconfined compressive strength, and bearing ratios


Project Summary

INTERRA’s scope of field work consisted of drilling a total of 40 boreholes and obtaining 3 asphalt core samples from the project site.  Of the 40 boreholes, 32 were completed on McCormick Boulevard between Emerson Street and Green Bay Road in Evanston, Illinois.  Two of the boreholes were in the proposed right turn lane on Green Bay Road, near the intersection of Green Bay and McCormick; a particularly congested portion of the impacted roadway.   All roadway borings were drilled to a depth of 10 feet.  However, the remaining 6 boreholes completed in the Ladd Arboretum area located along McCormick Boulevard and immediately south of it were completed to a depth of 25 feet, each.  In addition, INTERRA obtained three asphalt core samples on Green Bay Road, near the intersection of Green Bay Road and McCormick Boulevard.

The scope of laboratory work that INTERRA completed for this project consisted of performing Moisture Content and pocket penetrometer tests on all recovered cohesive soil samples.  Testing of selected undisturbed samples for Moisture Content, Unit Weight, Atterberg Limits, Sieve Analysis (Hydrometer) and Unconfined Compressive Strength was also included in the scope of work.  Additionally, performing Illinois Bearing Ratio Tests on 3 bulk samples from the roadway areas was completed.