Quality, Service & Commitment


  • 26 Oct 2017

    INTERRA To Host Ribbon Cutting With Bolingbrook Mayor Celebrating Going Green

  • 21 Jul 2017

    Recipient Of Service Award Thanks INTERRA for Engineering Support With Jane Byrne Circle Interchange

  • 15 Mar 2017

    INTERRA, Inc. Full-Time Field Technician Openings in Franklin, WI

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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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Great Lakes Naval Base, Great Lakes, IL: “They reacted extremely well to ever changing schedule demands and testing needs on short notice.” Joseph Albrecht, QC Manager, Blinderman Construction Company

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North Shore Sanitary District Landfill, Zion IL

INTERRA Services

Construction Quality Assurance (CQA) Services, including:

 Laboratory testing services

  Field density testing

√  Construction monitoring

  System evaluation

Project Summary

INTERRA provided comprehensive Construction Quality Assurance (CQA) Services to the North Shore Sanitary District during construction of its Zion Landfill in Zion, IL. Specifically, under a tight construction schedule, INTERRA provided laboratory services for the construction of approximately 4 acres of landfill cell, 4 acres of leachate holding pond, 10 acres of landfill final cover, and a pad pond.  Field density testing of the clay liner and nondestructive testing of the synthetic liner was performed.

With significant coordination required during construction, INTERRA’s fast-track laboratory services included flexwall permeability, soil index, and proctor tests.  Field services encompassed construction monitoring of the test pad, clay liner placement, synthetic placement, protective geotextile placement, drainage material placement, surveying, and pressure testing of leachate pipes. INTERRA was also retained to complete a system evaluation of leachate extraction and submersible pump station pumps.