Investigation & Inspection Services

Expertise for Transportation Infrastructure Maintenance and Development

We specialize in providing transportation clients with expert investigation and inspection services to support the maintenance, rehabilitation, and construction of critical infrastructure. Our multidisciplinary team delivers accurate assessments and actionable insights that help extend the service life of transportation systems while ensuring safety and compliance. NTH’s investigation and inspection services provide the foundation for safe, efficient, and sustainable transportation systems.

Comprehensive Investigation and Inspection Capabilities

Geotechnical Investigations
Our geotechnical team characterizes subsurface conditions to inform the design and construction of infrastructure. These investigations support structures, pavements, and earthwork slopes, providing the foundational data necessary to ensure stability and reliability.

Subsurface Utility Engineering (SUE)
NTH offers precise mapping of existing utility networks to minimize construction risks and avoid costly project delays. Our SUE services provide accurate depictions of underground utilities, ensuring safe and efficient subsurface construction planning.

Bridge, Dam, and Structural Scoping & Inspection
We deliver detailed assessments of bridges and other transportation structures, identifying deficiencies and evaluating structural capacity. Our inspections guide maintenance, repairs, and upgrades, ensuring continued serviceability and safety for users.

Environmental Contamination Investigations (PACS & PSI)
NTH conducts Property Assessment and Characterization Studies (PACS) and Phase II Subsurface Investigations (PSI) to identify and quantify potential environmental impacts. Our field sampling and testing provide critical data for understanding contamination parameters and guiding remediation efforts.