During the 2003 Shutdown (Sept-Nov 2003)at all the TeV SB “1 and 3” buildings Darrell Sigmon had the exhaust ports modified to allow alignment sites.  The new openings are about 12” in diameter.  We put the metal bands on them to secure them. There are no radiation safety concerns with these openings, as it is implausible a person could gain entry into the tunnel through these ports.