Joe D. and Jodi re-cleaned the two high quality viewports from the south door. Cheryl inspected them and they are ready for re-installation.

The crew finished pulling the iLIGO flooring and installed the aLIGO flooring that is electropolished and qualified for UHV service. In removing the remainder of the iLIGO flooring this morning, Mark L. came upon a mystery: two unexpected holes in the longest plank of the flooring. Attached please see some pix. As you can see from the size discrepancy, these are not the normal holes for BSC flooring. All LIGO-ites questioned deny drilling/tapping the holes. For now, we will chalk it up to the "little green men from outer space" but it is not comforting to have holes appear in structures without any notice or agreement. >-(