Massachusetts Attorney General Martha Coakley on Dec. 17 an-nounced that the state has reached a settlement with Powers Fasteners Inc. regarding the July 10, 2006, Interstate-90 tunnel-plenum collapse that crushed a car and killed a 38-year-old local woman, Milena Del Valle.

The tunnel is part of Boston’s $14.6-billion Central Artery/Tunnel project, which was completed in 2005. The collapse of some of the new tunnel’s concrete ceiling panels has been linked to improper use of the Brewster, N.Y-based firm’s fast-set epoxy in the an-choring system. Under the agreement, Powers will stop selling the fast-set epoxy and recall all previous sales. The fastener firm also will pay $16 million: $15.5 million will go to a state transportation-infrastructure fund and $500,000 will go to the city of Boston.