Eddie told me that the wall in ATF lab is plaster, so he could not anchor the machine thing on the wall. It will be drilled by a hand drill from ATF to PSL.

We tried to move the clean bench in PSL with 4 people, but it wouldn't budge.  So instead of moving the bench, I'll leave it as it is. Since I can cover the wall with Al foil/ plastic / wet sponge around the drilling area so that the dust is confined.

fig1: ATF lab, The hole will be drilled ~3 inches below the pipe.

fig2: PSL lab, there is ~7" space between the wall and the clean bench. I cannot move the clean bench, but I can  cover the wall with something, so I think it should be fine drilling with that.