In The Lovely Bones, where was Susie's body hidden?

Susie's body was cut into pieces and put into a garbage bag, then taken to the murderer's house, where it left a stain on the floor.  The murderer then placed Susie's body in a metal safe, locked it, and paid a small fee to discard it in a sinkhole outside of town.  The sinkhole was used as a kind of landfill, since objects that were discarded there were basically irretrievable.