Senators: Natural gas pressure was 12 times normal level before Massachusetts explosions

Senators are demanding answers about what warnings Columbia Gas had of blasts that destroyed as many as 80 homes in and around Lawrence, Mass.
ref:https://www.usatoday.com/story/news/nation/2018/09/18/massachusetts-natural-gas-explosions-pressure-ed-markey-elizabeth-warren-columbia/1345591002/