INTERRA is an industry leading provider of the following services:
- QC & QA Construction Materials Testing
- Geotechnical Engineering
- Environmental Engineering
- Construction Inspection
- Independent Assurance
- Construction Management
Agency Prequalified. INTERRA is prequalified by the Illinois Department of Transportation in the following categories:
- Geotechnical Services – General Geotechnical Services
- Geotechnical Services – Structure Geotechnical Reports
- Geotechnical Services – Subsurface Explorations
- Special Services – Quality Assurance PCC & Aggregate
- Special Services – Quality Assurance HMA & Aggregate
- Special Services – Construction Inspection
- Airports – Construction Inspection
NAICS Codes
- 541330 – Engineering Services
- 541380 – Testing Laboratories
