How to Handle an Emergency

Reporting

Pipeline markers and signage within the right-of-way identify MarkWest pipeline systems. The following items may indicate a Natural Gas or Natural Gas Liquid leak or failure:

• Liquid and/or gas escaping from the pipeline
• Hissing or spewing sound
• Fire at or near the pipeline
• Any naturally occurring event that may involve the pipeline right-of-way such as soil movement or significant erosion
• Items specific to Natural Gas (e.g., a "rotten egg" odor)
• Items specific to Natural Gas Liquids (e.g., distinct hydrocarbon odor, flow of liquid product, a low lying fog-like vapor or an apparent frozen area on or near the pipeline)

Reporting of Emergencies

• Dial 911
• Contact MarkWest

Actions If a Pipeline Incident Occurs

General Public and Excavators

• Immediately leave the area, on foot in an upwind direction
• Avoid making contact with escaping liquids or vapors
• Avoid possible ignition sources
• Abandon all equipment being used in the area
• Do not drive into the area (where the leak or vapor cloud is located)
• Do not light a match, start an engine or automobile, use a telephone, or switch on/off an electric light
• Warn others to stay away from the area
• Do not try to operate any pipeline valves yourself
• Do not use a cell phone while near the suspected emergency area
• From a safe distance dial 911 and call the MarkWest 24-hour emergency number

Public Officials and Emergency Responders

• Evacuate people (homes, businesses, schools... etc.) to an upwind area
• Secure area around the leak
• If the pipeline leak is not burning, take steps to prevent ignition by prohibiting smoking, rerouting traffic, and/or shutting off electricity and residential gas/liquid supply
• If the pipeline is burning, take steps to prevent secondary fires, but do not attempt to extinguish a pipeline fire unless asked to do so by MarkWest
• Do not try to operate any pipeline valves yourself (unless directed by MarkWest)
• Call the MarkWest 24-hour emergency number as soon as possible
• Administer medical treatment and request additional emergency response assistance as necessary