Abstract: At 9:15 a.m. on December 6, 2002, Employee #1, an ironworker, suffered serious injuries while working on a construction site in Oceanside, California. The project consisted of new construction of the Mission Avenue Sewer Lift Station for the City of Oceanside. The structure was one story above grade and extended the equivalent of three stories below grade. The ironworkers were responsible for erection of the roof structure and installation of stairs and "catwalks" below grade level. Employee #1 and his foreman were working and walking on the aluminum angle bracing and diagonals. Employee #1 was told to measure a wheel that was positioned below the angle bracing and diagonals on which he was standing. In the process of walking and positioning himself to measure the wheel, the angle brace "gave way" due to "temporary tack-welds" causing Employee #1 to fall approximately 16 feet to the stairway landing below. Fall protection devices were not in use. Immediate aid was rendered to Employee #1 and he was transported via air ambulance to Scripps Hospital in La Jolla, California. Employee #1 sustained serious injuries including a broken pelvis, broken ribs, punctured right lung, and a bruised liver.