Because shaft and tunnel work is taking place in a constricted space between two existing intake pumping stations, special precautions and close coordination associated with explosive quantities and blasting schedules were required to avoid disruption to existing pumping operations. Photos: Southern Nevada Water Authority
The tunnel-boring machine will operate in open mode during low water and stable conditions with the ability to switch to closed mode in high water and unstable areas.
A central auger will remove muck from the face and convey it along 600 feet of trailing equipment. Probes will drill ahead of the cutterhead to assess the rock and place grout to reduce water inflows