Abstract: At about 12:30 p.m. on January 28, 2013, Employee #1, a mason with Keith Kc Lee, Inc., was building a retaining wall (15 ft high by about 500 ft long) in a sloped hilly area in the back yard of a post office. The project was observed to be in the completion stages except for the minor work of backfilling of the excavated area at back. Employee #1 was stepping from a ladder (14 steps) on to the top of retaining wall when he lost balance and fell on the dirt ground. The ladder itself did not fall to the ground, and the ladder was found to be in good shape during inspection. Employee #1 was interviewed at a later date about his accident, and a written accident report was obtained from him in which no safety violation directly relating to this accident was observed. However, employer was cited for a regulatory violation of section 342(a) for not reporting this accident to Cal/OSHA, as required. Paramedics were called in, and Employee #1 was transported to the hospital and hospitalized there for 19 days due to fractured ankles, tibias, and fibulas.