Emergency in a major hazard installation may cause extensive damage to property and serious disruption both inside and outside the installation. The overall objectives of an emergency plan are: to localise the emergency and, if possible, eliminate it; and to minimise the effects of the accident on people and property. The off-site emergency plan is an integral part of any major hazard control system. In many countries the duty to prepare the off-site plan lies with the local authorities, including Malaysia. Thus, the preparations of written off-site emergency response planning is required to minimize the impact of major accident to the people , property and environment.