The document provides information on OSHA's Hazard Communication Standard, which requires that workers be informed of the chemicals hazards present in their workplaces. It outlines the basic elements of a hazard communication program, including developing a written program, obtaining and maintaining material safety data sheets for chemicals, properly labeling containers, and training employees. The document also lists many chemicals commonly found at construction work sites and provides guidance on reading material safety data sheets and understanding chemical labeling systems.