Utility executives discussed gas leaks with Massachusetts lawmakers at a public hearing, according to a story on WBZ.com. They discussed a series of explosions that occurred around the state and said they cannot fix every gas leak they find, because the cost would be too high. Gas workers union president Mark McDonald sounded the alarm on safety, saying the industry often ignores leaks that are classified as minor, including "approximately 15,000 grade 3 gas leaks in National Grid alone that are unattended." He added, "The main problem is leak management, and the [Department of Public Utilities'] failure to enforce regulations." Lawmakers say they are concerned about the state's gas pipe network, including older pipes made of bare steel and cast iron.