Generally we (the Hackage admins) ask you to do the following before asking us to take over a package.
Maintainer unreachable:
1. Try to contact the maintainer. Give him/her reasonable time to respond.
2. State your intention to take over the package in a public forum (e.g. haskell-cafe/libraries list). CC maintainer.
3. Wait a while.
4. Send us an email, with a link to the public email thread.
5. We will grant you maintenance rights.
Maintainer reachable:
Option 1 (preferred):
Option 2:
1. Email us, with the maintainer CCed.
2. Maintainer replies to email saying it's OK.
3. We grant access.
-- Johan