Transportation
Transportation Infrastructure impacts our daily lives and is one of the most “visible” systems our society encounters daily.. We rely on this extensive network of roads and bridges to get us safely and reliably to and from work/school/play as well as transport our goods to the local supermarket or our doorstep. Due to the highly visible nature of the transportation network, demand by the public is driving the need to keep these systems in top condition requiring upgrades/rehabilitation/replacement of the infrastructure facilities.
NTH is committed to improving the quality of life in the regions we serve by providing efficient, economical, and sustainable solutions to our transportation infrastructure clients. NTH has over 50 years of history in the improvement of Transportation Infrastructure. Our Transportation Services include Design of roads & streets/culverts & bridges/stormwater systems(open & enclosed) as well as Bridge & Structures Inspection, Geotechnical Engineering/Subsurface Utility Engineering and Construction Engineering Services.
We have been providing routine and complex geotechnical investigations, structural inspection and rehabilitation services, Subsurface Utility Engineering, pavement management and design, environmental contamination investigations, and construction inspection and testing services to our clients to help extend the service life of their existing infrastructure. NTH is also expanding our services further into the transportation arena by providing road and streetscape design, bridge inspection, scoping and design, and fully accredited Construction Materials Testing through our AASHTO/MDOT certified QA Laboratory.
Our MDOT Pre-Qualified Services include:
- Construction Engineering: Assistance
- Construction Inspection: Roadway
- Construction Testing:
- Aggregates
- Concrete
- Density
- HMA Assistance
- Design – Bridges: Safety Inspection
- Design – Bridges: Scoping
- Design – Roadway
- Design – Geotechnical
- Design – Geotechnical: Advanced
- Design – Hydraulics I
- Design – Hydraulics II
- Design – Utilities: Municipal
- Design – Utilities: Subsurface Utility Engineering
- Environmental: Contamination
- Investigations & Inspection
NTH provides transportation clients with expertise in investigating and inspecting existing conditions in support of maintenance, rehabilitation, and construction of transportation infrastructure.
- Geotechnical Investigations – Characterization of subsurface conditions for support of structures, pavement, and earthwork slopes
- Subsurface Utility Engineering – Accurate depiction of existing utility networks in support of subsurface construction
- Bridge and Other Structure Scoping & Inspection – Identification of structural deficiencies/capacity for repair, maintenance and other services to maintain serviceability of the structures.
- Environmental Contamination (PACS & PSI) – Investigation/analysis and identification of potential environmentally impacted sites and field sampling/testing to quantify the contamination parameters.
- Design
NTH provides transportation clients with safe and efficient infrastructure designs to support their network.
- Foundations and Slopes – Investigation and design of both shallow and deep foundation elements as well as earthwork sloping parameters
- Bridges and Other Structures – Structural design and rehabilitation
- Roadway and Streetscape – Geometrics, layout, and accessibility design for highways, arterials, and local streets
- Pavements – Management and design of rehabilitation and reconstruction of both asphalt and concrete pavements
- Municipal Utilities – Water/wastewater collection/distribution systems including rehabilitation and replacement design.
- Hydraulics – Site and water management investigation/analysis and design
- Construction Services
NTH provides transportation clients with construction support to ensure projects are built as designed and specified.
- Engineering – Management of contractors and work records
- Inspection – Observation and confirmation of construction activities & procedures
- Testing – Collection & sampling of construction materials and their proper placement
- As-Built Documents – Preparation of documentation reflecting the “as-constructed” conditions relative to the as-bid Documentation
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