Maine lawmakers are considering a bill that would make changes to the state's "Dig Safe" law in response to last year's deadly explosion in Farmington.The bill would add liquefied propane gas lines to the law."Dig Safe" laws prohibit digging around certain underground utility lines. In Maine, LP lines are currently not on the prohibited list, bill sponsor Rep. Seth Berry said."It is unfortunate that we have not already passed a bill to protect our LP lines. If we had, the devastating explosion in Farmington could have been avoided. We must take action now to ensure the safety of Mainers and to prevent an event like this from happening in our state again," Berry said.Berry said previous attempts to add LP lines to Maine's "Dig Safe" law did not pass in the Legislature. Those versions of the bill exempted smaller LP tanks, including the size of the tank in Farmington.Berry said his bill does not include any exemptions.Rep. Scott Landry, of Farmington, and Sen. Russell Black, of Wilton, are co-sponsors of the bill."Since the event, we have come together to support each other and to rebuild. Passing laws like this will remind our town that we are not alone, and that the state is working to protect us and prevent future tragedies," Landry said."I was very surprised to find that the type of buried line one would most want to have protected by Dig Safe is not covered by the program, especially with the number of people in more rural areas of Maine who use LP as a fuel," Black said.Propane companies argue the change adds a vast responsibility to them."This expansion of "Dig Safe" rules to include propane facilities and increase fines costs Maine businesses and our customers, and in our opinion, does not necessarily protect public safety," Dead River Company safety manager Mark Anderson said.Investigators determined that a leak in a propane line caused the explosion at the LEAP, Inc. building in September that killed Capt. Michael Bell and injured seven others.Bell's family testified in favor of the bill during a public hearing on Tuesday.The investigation into what caused the leak in the line continues.