Agreed, they don't want to you to flight plan it as an alternate, since the runway will be closed for work during those times.
However, if you really needed to get on the ground then they could, but they'd need 30 mins notice. That would mean clearing the runway of whatever works vehicles etc. they had and would cost them a whole lot of money...
That's only an interpretation though.
Last edited by hangten; 4th Jun 2011 at 01:29.
Reason: Late night spelling...