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Wastewater Services

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Structural Condition Assessment & Rehabilitation​

Rehabilitation of component or system failures can be costly and extensive. NTH’s Infrastructure Rehabilitation team provides comprehensive assessments to evaluate the condition of a structure’s concrete and structural elements to avoid failures. Our assessment process includes collection of data, evaluation of current conditions, and recommendations for rehabilitation.

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Deep Excavations and Tunnels

Underground engineering continues to be one of NTH's core strengths. NTH professionals have designed tunnels and other underground projects, provided field engineering during construction, investigated failures of underground facilities both during and after construction, and repaired damaged facilities.

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Subsurface Utility Engineering

​NTH professionals are adept at performing SUE services. Working in conjunction with project design personnel, we accurately locate existing utilities and identify areas of potential conflict well in advance of final design and the distribution of construction bid documents.