The provincial government says it will be filing its reference case over the Trans Mountain pipeline expansion with the B.C. Court of Appeal by April 30th. Environment Minister George Heyman says the appeal court is the highest available for such an action, which is aimed at determining jurisdiction in the dispute over the federally-approved pipeline. The N-D-P government has threatened to suspend additional bitumen shipments from Alberta while it awaits assurances an oil spill off its coast could be cleaned up but Heyman says the terms of the court reference are still being worked out. He also says that even if B-C loses, the government will continue to exercise its constitutional jurisdiction to protect the province’s environment.