For those who are interested, please find below the full report from the NTSB from the Merrimack Valley Gas Explosions related to the affected communities and municipalities
Full report here: https://www.ntsb.gov/news/events/Documents/2019-PLD18MR003-BMG-abstract.pdf
Also there is in interesting article below about the event in the attached newsletter: https://www.flipsnack.com/osdsocialmedia/buy-the-way-september-october-2019-fcilosa3x.html