Pampas grass will not survive a Pennsylvania winter.

Agree. True pampas grass - Cortaderia selloana - is only winter hardy in zone 7 and above.

>It was dried when I received it<

As in brown and dead looking? If you are in fact talking about Cortaderia this is an evergreen species that shouldn't look completely without any green at all anywhere on the foliage crown at any time. Also if the plant was received bare-rooted grasses of this nature don't really like drying of the roots very much.