On October 8, 2013, the Chesapeake Bay Bridge-Tunnel Commission awarded Jacobs the supplemental agreement to map the existing conditions for the Parallel Thimble Shoal Tunnel project in the amount of $191,000.
Jacobs prepared a topographic map that shows the roadway approaches to and including Portal Islands Number 1 & 2 along with the fishing pier on Portal Island No. 1.
The mapping of these areas, including the existing tunnel, was completed utilizing terrestrial laser scanning, mobile scanning/profiling and traditional mapping equipment including robotic total stations and levels. The mapping of the pier, rip-rap, splash walls and outer edges of the approach roadway bridges within the mapping limits was accomplished by mounting a mobile scanner/profiler on a watercraft. Subsurface utilities, traceable using radio frequency equipment, were designated, marked and field-located on Portal Islands 1 & 2.
This work is scheduled to be completed by July 2014.