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GLOSSARY HLA. (See High Level Alarms).

HMRT. (See Hazardous Materials Response Team).

Hot Zone. An area immediately surrounding a hazardous materials incident, which extends far enough to prevent adverse effects from haz- ardous materials releases to personnel outside the zone. This zone is also referred to as the “exclusion zone”, the “red zone”, and the “re- stricted zone” in other documents. Law en- forcement personnel may also refer to this as the inner perimeter.

Hydrocarbons. Compounds primarily made up of hydrogen and carbon. Examples include LPG, gasoline and fuel oils.


IAP. (See Incident Action Plan). ICS. (See Incident Command System).

ICS Command Staff. Those individuals ap- pointed by and directly reporting to the Inci- dent Commander. These include the Safety Officer, the Liaison Officer, and the Public In- formation Officer (PIO).

ICS General Staff. Section Chiefs are members of the Incident Commander’s general staff, and responsible for the broad response functions of Operations, Planning, Logistics, and Finance/ Administration.

IED. Improvised Explosive Device.

Ignition (Autoignition) Temperature. Mini- mum temperature required to ignite gas or vapor without a spark or flame being present. Significant in evaluating the ease at which a flammable material may ignite.

ILI. (See In-line Inspection Tools).

Immediately Dangerous to Life or Health (IDLH). An atmospheric concentration of any toxic, corrosive or asphyxiant substance that poses an immediate threat to life or would cause irreversible or delayed adverse health ef- fects or would interfere with an individual’s ability to escape from a dangerous atmosphere.

Incident. (1) The release or potential release of a hazardous material from its container into the environment. (2) An occurrence or event, either natural or man-made, which requires ac- tion by emergency response personnel to pre- vent or minimize loss of life or damage to property and/or natural resources

Incident Action Plan (IAP). The strategic goals, tactical objectives and support require- ments for the incident. All incidents require an action plan. For simple incidents (Level I) the action plan is not usually in written form. Large or complex incidents (Level II or III) will require that the action plan be documented in writing.

Incident Command System (ICS). An organ- ized system of roles, responsibilities, and stan- dard operating procedures used to manage and direct emergency operations. May also be referred to Incident Command System (ICS).

Incident Commander (IC). The individual re- sponsible for establishing and managing the overall incident action plan (IAP). This process includes developing an effective organizational structure, developing an incident strategy and tactical action plan, allocating resources, mak- ing appropriate assignments, managing infor- mation, and continually attempting to achieve the basic command goals. The IC is in charge of the incident site. May also be referred to as the On-Scene Incident Commander as defined in 29 CFR. 1910.120.

Incident Command Post (ICP). The “on- scene” location where the Incident Com- mander develops goals and objectives, communicates with subordinates, and coordi- nates activities between various agencies and organizations. The ICP is the “field office” for on-scene response operations, and requires access to communications, information, and both technical and administrative support.

In-line Inspection Tools (ILI). Cylinder shaped plugs of roughly the same diameter of a pipeline that are used to inspect and locate anomalies in the pipeline wall before they can progress to the point of causing a leak.


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