An excavator exposes the faulty section of a water main servicing Broken Ground School in Concord on Jan. 4, 2017. Wednesday classes were canceled after the leak was discovered Tuesday afternoon. (ELIZABETH FRANTZ / Monitor staff)
An excavator exposes the faulty section of a water main servicing Broken Ground School in Concord on Jan. 4, 2017. Wednesday classes were canceled after the leak was discovered Tuesday afternoon. (ELIZABETH FRANTZ / Monitor staff)

A Merrill Construction crew worked to replace a faulty section of the water main servicing Broken Ground School in Concord on Wednesday. Wednesday classes were canceled after the leak was discovered Tuesday afternoon.