St. Paul

St. Paul skyline

Terracon has been providing engineering consulting services in Minnesota since 1988 when it opened its first office in White Bear Lake. We added a second office in Plymouth with the acquisition of Liesch Associates in 2011, and are now offer a full range of Terracon services. We provide environmental, facilities, geotechnical, and materials services to a wide-range of clients in the commercial, industrial, and state and local government markets. We employ more than 75  professionals including engineers, geologists, scientists, engineering technicians, and administrative support staff.

We have a fully equipped, American Association of State Highway and Transportation Officials (AASHTO) and United States Army Corps of Engineers (USACE) certified laboratory.


  • Site Investigation and Closure
  • Brownfields/Site Development
  • Asbestos Consulting
  • Remediation Design and Implementation
  • Due Diligence/Phase I ESAs
  • Industrial Hygiene
  • Regulatory Compliance
  • Natural/Cultural Resources
  • Solid Waste Planning and Design
  • Industrial Wastewater/Air Design and Permitting


  • Building Enclosure Consulting (Roofs, Walls, and Waterproofing)
  • Engineering and Materials Diagnostics
  • Property/Facility Condition Assessments
  • Aquatics Assessment and Design
  • Energy/Building Performance Modeling
  • Facility Asset Management Programs
  • Forensic Investigations


  • Report of Expected Geotechnical Conditions (REGC)
  • Subsurface Exploration (Soil Borings, CPT, In-Situ Testing, Geophysical)
  • Laboratory Testing
  • Geotechnical Design
  • Collaborative Reporting/Decision Making
  • Geotechnical Instrumentation
  • Construction Monitoring and Support


  • Construction Quality Assurance/Quality Control
  • Construction/Special Inspection
  • Materials Engineering
  • Field and Laboratory Testing and Analysis
  • Construction Observation and Monitoring
  • Pavement Consulting and Engineering
  • Structural Steel and Nondestructive Testing



955 Wells St., Ste 100 St. Paul, MN 55106
Phone: (651) 770 1500
Fax: (651) 770 1657