Crews failed to relocate pressure-sensing lines from an old cast-iron distribution main during a mid-September Columbia Gas pipeline replacement, igniting a series of explosions and fires north of Boston, according to a preliminary report by federal investigators.
The Massachusetts Dept. of Public Utilities will hire an independent firm to examine the commonwealth’s natural gas distribution system in the wake of massive gas explosions in three towns north of Boston.
Accident investigations board will look into the cause of an April explosion that killed two working on a basement water heater and badly injured a third .