Federal safety officials have cited Harrison Hoist Inc., Grand Prairie, Texas, for six serious safety violations and fined it $29,400 in connection with a tower-crane collapse during disassembly at the University of Texas, Dallas, that killed two workers on July 7. The U.S. Occupational Safety and Health Administration cited the firm for failing to ensure that disassembly procedures positioned workers to minimize their exposure to danger and failing to ensure the procedures were developed by a qualified person, among other violations. Harrison Hoist crews were working at the site of the new $60-million Arts and Technology Building on the Richardson, Texas, campus when the accident occurred. Officials from Harrison Hoist could not be reached for comment.