Abstract: At about 9:40 a.m. on July 14, 2005, Employee #1 and five coworkers were pouring concrete on the 2nd floor of a steel structure building, locally known as Building A. After finishing the concrete floor, a coworker held the concrete pouring hose nozzle while Employee #1 aided him in folding and tying the hose with a wire to prevent spillage. As Employee #1 tied off the hose, the boom of the concrete pump fell downward quickly and the reducer component of the boom struck Employee #1 on the head and knocked him to the ground. The reducer also struck two coworkers, but they did not sustain any serious injuries. Employee #1 suffered a serious injury to his neck and spinal cord which required surgery and hospitalization for seven days. The employer was a general contractor at the site, with 350 employees. Employee #1 was a regular employee of the contractor.