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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You have skilled people, a superior laboratory facility with all the equipment in excellent condition and an outstanding QC/QA program. Your certified tranined staff was knowledgeable, courteous and proactive…

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Underground Electrical Duct Bank Repair; Detroit Water & Sewerage Dept

INTERRA Services

  Provide sub-contractors with Quality Control (QC) Plan for concrete

  Oversee earthwork operations including excavation, grading, and backfilling

  Perform compaction testing and proof-rolling

  Laboratory testing including modified proctor tests, grain size analysis and organic content

  Concrete testing for electrical duct banks, pier foundations, and pavement

  Concrete core testing; pavement thickness


Project Summary

As an integral member of the project team, INTERRA’s technical services and provided expertise for this highly demanding and challenging project – scheduled for completion in August 2014 – has been highly varied.

The geotechnical scope of the project consisted of installing concrete pier foundations for each of the many needed trestles.  The civil portion consisted of eliminating water leakage through the EB-1 basement walls from the sump pump and duct banks entering into the basement area.  Additional civil engineering work included waterproofing the EB-1 basement walls and minor site grading.  Finally, the project’s structural scope of work consisted of installing above ground trestles to support overhead electrical conduits and cables, the installation of a new foundation for new switchgear, and a foundation for a new transformer.  Other structural work included repairing concrete spalling cracks within one of the basements.