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WELCOME

Interra Inc., formerly known as Great Lakes Soil & Environmental Consultants, Inc. (GLSEC) provides comprehensive field & laboratory testing and consulting services in the areas of geotechnical, materials and geo-environmental engineering. Our Professionals possess extensive experience, advanced academic background to meet even the most demanding needs of geotechnical, construction monitoring and geo-environmental fields. INTERRA's staff includes Registered Professional Engineers and certified Engineering Technicians. Our corporate office and laboratory are located in Bolingbrook, Illinois.

CERTIFIED

Our highly qualified and experienced staff is complemented by our IDOT, WisDOT, MDOT, U.S Army Corps of Engineers & American Association of State Highway Transportation Officials (AASHTO) certified materials laboratories, providing the needed common & advanced laboratory testing for soils, concrete, hot-mix asphalt, aggregates & geosynthetics. Click here for more information.

FACTS

INTERRA has worked on over 5000 small, medium and large
projects involving soils investigation, laboratory testing, design
and construction monitoring. Our clients include engineering and environmental consulting firms, owners, contractors,
municipalities, state and federal agencies. Our projects include airports, highways, school buildings, restaurants, commercial & industrial buildings, residential subdivisions, shopping complexes, sanitary and ash landfills, parking lots, bridges, golf courses,
waste water treatment plants etc.