1. What are the concerns of project manager Bryan Lee?
To mack sure all date are set and everything is in place.

2. Why do they engineers and construction workers use a boring machine to make tunnels instead of cut and cover construction?
Because it a far less urface distubance.

3. What do the worker’s do to protect themselves in the newly formed tunnels from harmful levels of gases found in the soil at the various new subway sites?
They wear work boots and hard hatts.