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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LPV111, New Orleans East Back Levee, Louisiana: “Management was attentive to our needs, provided the advice needed to make cost effective decisions, and followed through with action in the field.  This was a very high profile project with a one …

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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.