Every business should develop and implelement an emergency plan for protecting employees, visitors, contractors, and anyone else on site. An emergency response plan is a written document that enables business to plan for incident response and is included in part of a business continuity program. It should be drafted with known resources available, and include a process for assessing damage, protecting property, and minimizing damage and business disruptions.

More information on emergency response plans can be found at Ready.gov

Emergency Response Plan
http://www.ready.gov/business/implementation/emergency