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Adm. Harold Gehman, center, chairman of the Columbia Investigation Accident Board, talks to U.S. Representative Dave Weldon (right) during the CAIBs visit to the KSC RLV Hangar. Left of Gehman is U.S. Representative Tom Feeney. Gehman and the board visited the Hangar as part of the ongoing investigation. Recovery efforts as of May 5 included 82,500 pieces of debris weighing 84,800 pounds, almost 40 percent of the total dry weight of the shuttle. About 25,000 personnel took part, utilizing almost 1.5 million total man-hours in the recovery effort and involving more than 130 federal, state and local agencies. The operation was also supported by more than 270 organizations that included businesses and volunteer `groups`.