Workers are placing large diameter pipe into a trench that is 6 feet deep. They are using a trench box for protection. They reposition the trench box each time a pipe section is installed. Placing a ladder into the box makes the working space even tighter. Therefore, they are pulling the ladder out of the box while the pipe is lowered and manning the ladder for placement into the box if egress is needed. Is this acceptable? Yes. The ladder placed in the box creates an additional hazard No. The ladder must be immediately available at all times