Abstract: At approximately 8:26 a.m. on December 10, 2010, Employee #1 worked near an electro tinning line, inside a building located in Pittsburg, CA that contained a production plant. Employee #1 worked with a crew. The crew was erecting a metal tube and coupler scaffold near the evaporator service unit inside the production plant. Employee #1 worked approximately 11 ft above a lower level concrete deck. Employee #1 wore a fall protection harness with the lanyard tied off to the north end bearer or bar as an anchor. Employee #1 attempted to move along the runner on the upper section of the scaffold. Employee #1 used a midrail for balance. The midrail Employee #1 used gave way, and Employee #1 fell back approximately 16 ft onto the concrete deck below. The fall protection did not arrest the fall because the bar used as an anchor broke free from the clamps used to hold the bar in place. Employee #1 sustained minor injuries from the fall, including contusions and abrasions. Another employee contacted on-site emergency services. Emergency services responded and the lead emergency personnel at the site contacted the plant's dispatch communication center, which contacted the fire department. The fire department responded to the emergency and transported Employee #1 to a hospital in Walnut Creek. Employee #1 was hospitalized and treated for his injuries. At approximately 2:50 p.m. on December 10, 2010, a fire department captain reported the accident to the local Division of Occupational Safety & Health Concord Office.