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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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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Algonquin Bypass, Village of Algonquin, IL

INTERRA Services

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.


responsibilities included PCC Plant & Field-testing and inspection. Witness, verify and perform split sampling with contractor quality control. Project responsibilities included aggregate proportioning, PCC plant and field-testing, completion of QA documentation and trouble shooting issues related to materials. Daily inspection and testing included testing slump, air content and temperature testing on cast-in-place concrete.


Daily inspections of Hot Mix Asphalt (HMA) include drum plant inspection and field density testing. HMA plant inspection involves verification of mix being shipped to the jobsite, six minute counts, stockpiles, witness QC testing and procedures, verify control charts, load outs, temperatures, data logger information, testing PFP core samples, obtain HMA split samples. HMA field inspection involves density testing of HMA during placement splits and independent checks, verify quality control testing, make comparisons, verify rollers, rolling patterns, paver speeds and make suggestions for corrective actions to the quality control personnel in situations when tests are failing and/or not comparing.

Project Summary

The work consists of the construction of a new four lane divided highway and diamond interchange for the Western Algonquin Bypass. With this, portions of existing IL Route 31, Huntington Drive and Algonquin Road will be widened and resurfaced or reconstructed to accommodate the new alignment.  This work includes both hot-mix asphalt pavement and P.C. concrete pavement and will also include four new bridges, retaining walls, noise walls, new traffic signals, roadway lighting, the relocation of sanitary sewer and watermain, pavement markings, landscaping and restoration.