Massachusetts Gov. Mitt Romney said Monday, July 17, that
investigators have found a total of 1,454 potentially problematic bolt fixtures
in the section of the Big Dig tunnel that collapsed last week, crushing a car
and killing a female passenger.
The section of Interstate 90 in question, which connects
Interstate 93 to the Ted Williams Tunnel, remained closed indefinitely Tuesday,
July 18, though the portion of the tunnel leading to Logan Airport was still open.
A second part of the tunnel, a mile-long ramp that connects
Interstate 90 west with Interstate 93 north and south was shut down Monday
after tests on the bolts used to secure concrete panels to the ceiling showed
numerous potential problems including problems with the epoxy used to hold the
bolts in place, according to The Associated Press.
The Boston Globe reported that Romney said redundant
retainer systems would be put in place in any section of the tunnel that uses
the bolt and epoxy combination.
The investigation into the bolts stemmed from a fatal July
10 accident in which several three-ton slabs of concrete came loose from the
ceiling and crushed a passing car.
The tunnel closures have brought more traffic to the surface
on Boston’s streets. The Massachusetts Turnpike Authority has posted
information on alternate routes and closures on the Big Dig Web site at http://www.masspike.com/bigdig.