7NT inspectors currently supplement the construction inspection team for the project. Full time roles on the site for the 4‐5 year duration of the project include tunnel inspectors who work shifts in the 250 to 285‐foot deep tunnel documenting all activities of the Tunnel Boring Machine (TBM), including mining, re‐gripping, probe hole drilling, pre‐excavation grouting, installing rock supports, maintenance, and all of the other activities. Additional roles include the surficial inspection of the drilled launch, access/utility, and retrieval shafts of the levee extension and the spoil hauling. Our personnel also supplement the construction inspection team with a full time administrative role who maintains document control of the project record through Contract Manager software (schedule, progress, reporting).
Compliance with Performance Schedules
7NT is also responsible for all of the construction material testing on the project. This has included in‐depth testing of the levee extension for all material used to verify conformance with project specifications for type and compaction to aid in the certification of the levee prior to mobilization of the TBM down the launch shaft. This particular task was very crucial in the early stages of the project as the quantity of usable on site material was much less than originally expected. The project was facing significant issues in terms of delay and cost increase. 7NT helped to determine suitable usage for the on‐site material in different components of the levee through the application of a rigorous testing schedule. This allowed more permeable material to be used as fill in the central part of the levee while the more appropriate and impermeable material sufficiently capped the levee system]. Our team also includes a Quality Assurance (QA) Manager who is responsible for overseeing all aspects of QA for the project, but most specifically the conformance of the construction materials used to project specifications. Additional QA services include submittal & RFI review and commenting and scoping development of inspection and materials testing related activities.