Drilling Services
Deep geotechnical borings, rock coring, packer testing, instrumentation, and specialized tunnel investigation support.
Read MoreDeep tunnel and geotechnical specialists
7NT Engineering
Specialized geotechnical engineering for deep tunnels, infrastructure, and complex subsurface work.
What 7NT does
Complex subsurface work, handled with precision.
7NT is the symbol for Seven No Trump, the highest contract in the game of Bridge. Proper execution of that contract requires great care and precision, reflecting the way 7NT delivers services to clients.
Inspection / Testing (QA)
Construction inspection and materials testing for earthwork, structures, tunnels, shafts, pavements, concrete, steel, and masonry.
Read MoreEngineering Services
Geotechnical engineering, investigation planning, foundation design, retaining structures, pavements, and subsurface risk reduction.
Read MoreUtility Construction Services
Utility construction, manhole rehabilitation, sewer repair, and field execution for municipal infrastructure systems.
Read MoreLaboratory Testing Services
Soil, rock, aggregate, masonry, concrete, and asphalt laboratory testing aligned with widely accepted ASTM and AASHTO procedures.
Read MoreExplore by discipline
Start with the problem, then move into the capability.
7NT's work connects field investigation, engineering judgment, quality assurance, laboratory testing, and utility construction into a clearer path for complex infrastructure decisions.
Drilling
Drilling
Deep geotechnical borings, rock coring, packer testing, instrumentation, and specialized tunnel investigation support.
Inspection/Testing
Inspection / Testing
Construction inspection and materials testing for earthwork, structures, tunnels, shafts, pavements, concrete, steel, and masonry.
Engineering
Engineering
Geotechnical engineering, investigation planning, foundation design, retaining structures, pavements, and subsurface risk reduction.
Construction
Construction
Utility construction, manhole rehabilitation, sewer repair, and field execution for municipal infrastructure systems.
Drilling
Laboratory Testing
Soil, rock, aggregate, masonry, concrete, and asphalt laboratory testing aligned with widely accepted ASTM and AASHTO procedures.
Why clients trust 7NT
Field-tested teams for high-stakes infrastructure.
7NT personnel are invited to work on complex projects nationwide because the team understands the cost of inaccurate data and poor field execution.
2008Firm founded
65Professional and technical staff noted on the original site
8Owned drill rigs described on the services page
450 ftSpecialized drilling depth capability noted on the original site
Completed work
Featured projects
Engineering
Potomac Interceptor Project
Potomac River near Washington, DC
Helicopter-supported geotechnical investigation for a critical sanitary sewer interceptor near Great Falls Park.
View Project
Engineering
MI Soo Lock - Phase 3 New Third Lock Foundation Verification Drilling
Sault Ste. Marie, Michigan
Foundation verification and instrumentation drilling for improvements to the northern approach channel and New Lock construction.
View Project
Engineering
Gordie Howe International Bridge
Detroit, Michigan / Windsor, Ontario
Geotechnical drilling and technical support for one of North America's largest bridge infrastructure projects.
View ProjectPhilosophy
Integrity, reliability, and performance.
7NT is a highly specialized geotechnical firm heavily involved in the design and construction of deep tunnels. These tunnels are used as massive storage facilities in the water and wastewater treatment industries as well as transportation conduits through mountains and under streams.
Integrity
When 7NT enters into an agreement with a client, the team delivers what it commits to deliver, when it commits to deliver it.
Reliability
Clients understand that 7NT will do whatever it takes to get the job done on time, under budget, and with high quality.
Performance
7NT thinks constantly on its clients' behalf and explores better ways to deliver each project.
Recent news
Updates from the team
News
Chase Howard is now a Registered Professional Geologist!
7NT is proud to announce that Chase Howard is now a Registered Professional Geologist.
Read More
News
Congratulations to Chris Harrison!
Chris Harrison was named RPR of the Year by Indianapolis DPW.
Read More
News
Client Feedback
Dugan & Meyers shared feedback on 7NT's responsiveness, standards knowledge, reporting, and management support.
Read MoreStart a conversation
Do you have a project 7NT can help with?
Reach the team for geotechnical engineering, drilling, inspection, lab testing, construction, or project-specific support.