PODCAST Jack Lemley: Big Dig Report Reaction The National Transportation Safety Board found on July 10 that improper epoxy use, poor or misleading product information and lack of follow-up inspections were the critical factors that led to a fatal Interstate 90 tunnel plenum collapse in Boston last year. The NTSB board unanimously adopted the 171-page report, which includes 20 findings and 20 safety recommendations. In a five-hour meeting, held one year to the day after the collapse, the board determined that the pullout failure of twenty 8-in.-long threaded stainless-steel epoxied bolt anchors precipitated the collapse. Ten precast concrete panels and