On December 10, 2007, S.B. 19A -- the Waste Coal Gasification Infrastructure Development Act -- was introduced in the Pennsylvania legislature. Among other attributes, the bill defines "carbon sequestration" to mean a "process to capture and store or dispose of carbon dioxide and other carbon-based compounds from facility emissions for the purpose of preventing the release of such materials into the environment" (sec. 2).
This definition is interesting for several reasons. For starters, it hints at the acceptability of co-injection, which will be a necessity for CCS to prosper. The "purpose of" language, meanwhile, perhaps could be interpreted to suggest a permanence standard with some amount of flexibility. Finally, we are curious if the "the environment" includes any subsurface feature outside the boundaries of the storage reservoir.
The States continue to move ahead of the federal government on CCS issues.