In many counters and state the ground rules are well defined as to the approach that must be taken with providing the contingency plan for H2s.  However it is the responsibility of both Operator and contractor too provide such a plan and training before an operation is permitted to commence  The purpose of the contingency plan is to provide an organized plan of action for alerting and protecting the public prior to an intentional release, or following the accidental release of a potentially hazardous volume of hydrogen Sulphide. Any operations subject to this H2s should develop and provide an in-depth  written contingency plan complete with all requirements before hydrogen Sulphide operations are begun. The conditions that might  pose a threat  in each area of exposure must  be considered when preparing the plan. Such a plain should be graded in steps, dependent on condition that may prevail at the time of the release and taking into account the worst circumstance an, "uncontrollable discharge or pipe line fracture"   It must  include instructions and procedures for alerting the general public and public safety personnel of the existence of an emergency, include procedures for requesting assistance and for follow-up action to remove the public from an area of exposure. Special instructions for conditions at a particular installation such as local terrain and the effect of various weather conditions must also be taken into account The plan must  be activated prior to an intentional release, or immediately upon the detection of an accidental release of a potentially hazardous volume of hydrogen Sulphide   include a call list which shall include the following as they may be applicable: A well defined and structural chain of command must be establish and in area of high risk rate drills that include all member should be undertaken and if necessary include key members of the public. We would never consider working over a well or drilling a well that contained high concentrations of hydrogen Sulphide gas with untrained people. If working on land we must also conceder the safety of the public this means educating them.  Supervisory personnel;  Offshore This should include any shore base people such as the Rig Superintendent on the drilling side and the Drilling Superintendent on the operator side. They will continue and follow up on their side. Alert the necessary department.  Stand by boats, Supply boat. Fishing boat that may be in the area. Helicopters. Near by platforms. Gathering station. Any operation within 3000 feet. Neighbouring rigs. Local Police: They will inform the local community and if needed take the necessary action and evacuate  the area should the need arise. Under such condition such people should be left alone to do there work The plan must include a map detailing the area of exposure. it should  include the locations of private dwellings or residential areas, public facilities, such as schools, business locations, public roads, or other similar areas where the public might reasonably be expected within the area of exposure. The plan must also  include a list of the names and telephone numbers of the responsible parties for each of the possibly occupied public areas, such as schools, churches, businesses, or other public areas or facilities within the area of exposure. Hospital Ambulance service, Doctors, local clinic. area group such as the St John Ambulance all need to be informed an involve and if necessary train in emergency procedures Contractors For back up and  supplemental equipment this should also include the fire department. Public Safety The plan is to include names and telephone numbers of residents within the area of exposure, and the  provisions for advance briefing of the public within an area of exposure. Such advance briefing shall include the following subjects: The necessity for an emergency action plan. The possible sources of hydrogen Sulphide within the area of exposure;   Hazards and characteristics of hydrogen Sulphide. Manner in which the public will be notified of an emergency. Instructions on reporting a gas leak Steps to be taken in case of an emergency. Evacuation routes. Location of safety and life support equipment; Location of hydrogen Sulphide containing facilities Location of nearby telephones and/or other means of communication; and local radio station to tune into in an emergency.   Now day there is the web and a site should be set up to keep the local people informed of any progress or potential problems. Transportation Consideration must be given the transport in the area and should involve Local or near by Airports, public transport and the like