John, Chandra

Now backing turbo pump on Xarm spool with scroll pump. 
Closed QDP80 valve on Xarm spool pump station. 
Closed vent/purge valves at both X & Y spools.
Closed valves on Inficon gauges (PT-170 and PT-180).

Pressure on PT-170 reading 1.56e-6 Torr.