[CentOS] defer (not skip) boot fsck?

I have some large filesystems that are only used for rarely used
archived data.  Is there any way to specify in fstab or elsewhere that
if these have passed their 'time to run fsck' that it could be put in
the background and the system could go ahead and boot, mounting them
whenever the operation finishes?

-- 
  Les Mikesell
     lesmikesell at gmail.com