Abstract: On the afternoon of July 3, 2007, Employee #1 was standing on an old concrete floor, 2 ft above grade, controlling a 4 in. shotcrete hose that was being washed out at 1,200 psi. He put his right foot on the hose to control it, lost his balance, and fell backward approximately 25 in., landing on a #4 capped rebar that protruded 45-1/2 in. above grade. When Employee #1 fell, he knocked off the loose rebar cap and the rebar went up his rectum to his backbone. He was dislodged by the San Francisco Fire Department and taken to San Francisco General Hospital, where he underwent colon surgery. He was discharged from the hospital at 3:45 p.m. on July 8, 2007.