Some states (14 that I know of) require safety committees at workplaces with some minimum number of employees, and their regulations may prescribe a mission for you. If you're not in one of those states, here are some ideas for language:
"[Company] is dedicated to protecting the safety and health of its employees. We have established a safety and health program to prevent injuries and illnesses due to hazards. Employee involvement at all levels of the company is critical for us to be successful in this effort. To accomplish this task, a joint worker/management safety committee has been established to bring workers and management together in a nonadversarial, cooperative effort to promote safety and health in the workplace. This safety committee will provide information and recommendations to management about occupational safety and health conditions and practices, and to provide a forum for information exchange."
"A safety committee is established as a management tool to recommend improvements to the workplace safety program and to identify corrective measures needed to eliminate or control recognized safety and health hazards."