The metric symbol for micrograms per cubic metre. The abbreviation for Alberta Environment. The abbreviation for area of high conservation value.

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1 MACKENZIE GATHERING SYSTEM MACKENZIE VALLEY PIPELINE SUPPLEMENTAL INFORMATION PROJECT UPDATE GLOSSARY > The symbol for greater than. < The symbol for less than. C The symbol for degrees Celsius. % The symbol for percent. µg/m 3 Aboriginal person access road Active I channel Active II channel AENV AHCV airshed all-weather road ambient air quality anchor fields The metric symbol for micrograms per cubic metre. Any Indian, Inuit or Métis person who was born in the Northwest Territories or who is descended from an Aboriginal person born in the Northwest Territories. A temporary, permanent, or winter road that provides access to a facility, camp site, borrow site, barge landing site or a pipeline right-of-way, and that is not open to the public. A water channel that has a perennial flow or is partially frozen to the channel bed during winter. A water channel that is frozen to the bed or that has no flow during winter. The abbreviation for Alberta Environment. The abbreviation for area of high conservation value. The geographic area associated with movement of air and emissions. An area over which model predictions are made and within which emissions from different facilities interact. Emissions from one airshed are not considered to interact with emissions from other airsheds. A paved or unpaved, i.e., gravel, road that is open to traffic all year. The quality of any unconfined portion of the atmosphere, open air or surrounding air. The three natural gas fields, Niglintgak, Taglu and Parsons Lake, whose production will provide the initial volume of gas shipped in the project pipelines. November 2005 GL-1

2 aquatic baseline Bcf/d biophysical environment block valve borrow site BTEX CASA CH 4 channel CO CO 2 compressor station cumulative effects db dba discontinuous permafrost dispersion modelling Growing in, living in or frequenting water. Also, occurring, or situated in or on water. A surveyed condition that serves as a reference point to which later surveys or assessments are coordinated or correlated. The abbreviation for billion cubic feet per day. An environment that includes air, noise, aquatic (hydrogeology, hydrology, water quality and fisheries) and terrestrial (soils, landforms, permafrost, vegetation and wildlife) conditions. A device, positioned at intervals along a pipeline, that controls the rate of flow in the pipeline, opens or shuts off the pipeline completely, or serves as an automatic or semi-automatic safety device. An area that could be excavated to provide material, such as gravel or sand, to be used, where required, by the project. The abbreviation for benzene, toluene, ethylbenzene and xylene. The abbreviation for the Clean Air Strategic Alliance. The chemical symbol for methane. A natural or artificial waterway that periodically or continuously contains moving water, has a definite bed, and has banks that confine the water at low to moderate streamflow. The chemical symbol for carbon monoxide. The chemical symbol for carbon dioxide. A facility containing equipment that is used to increase pressure to compress natural gas for transportation in a pipeline. Changes to the environment caused by an action, including projects and activities, in combination with other past, present and future human actions. The abbreviation for decibel. The abbreviation for A-weighted decibel. A zone of permafrost containing patches of unfrozen ground, such as beneath large rivers and lakes. A computer modelling technique used to predict downwind concentrations of air contaminants from a known discharge rate, height and temperature. GL-2 November 2005

3 disturbed site ECO 2 ecosystem EIS emission facilities fine particulate matter footprint fugitive emission gathering system granular material greenhouse gas groundwater groundwater recharge ha habitat habitat fragmentation heritage resources An area with evidence of previous anthropogenic activity. The abbreviation for equivalent carbon dioxide. An integrated and stable association of all living organisms and the nonliving physical and chemical factors of their environment, within a defined physical location. The abbreviation for environmental impact statement. Air pollutant discharged into the atmosphere. Gathering and gas pipeline systems, including compressor and pump stations, block valves, pig launchers and receivers, heater stations and meter stations. Particulate matter that is small enough to be breathed deeply into the respiratory tract. The amount and shape of the area disturbed. An uncontrolled output of air pollutants to air, water or land. A system of pipelines and related facilities that include four gathering pipelines, the Inuvik area facility, the NGL pipeline and related facilities, such as valves, pig launchers and receivers. Material deposits that have a granulated surface or structure, such as gravel. Any of various gases, e.g., CO 2, CH 4, NO 2, that are more transparent to incoming solar radiation than to reflected radiation from the earth and that contribute to the heating of the earth s surface and lower atmosphere. Subsurface water that is recharged by infiltration and enters streams through seepage and springs. The processes involved in the absorption and addition of water to the zone of saturation. Also refers to the amount of water added. The metric symbol for hectare. The place or environment where a plant or animal naturally and normally lives and grows. Breaking up continuous tracts of habitat, creating barriers to migration or dispersal of organisms, and reducing the size of homogeneous areas. Fragmentation can be induced by human activities or by natural processes. Cultural, historic, archaeological and palaeontological resources. November 2005 GL-3

4 HRIA INAC infrastructure Inuvik area facility keq/ha/a key indicator kg/ha/a km KP kt/a L lateral LSA logistics m MACA mg/l mitigation mm Mm 3 /d The abbreviation for heritage resources impact assessment. The abbreviation for Indian and Northern Affairs Canada. The basic facilities, such as transportation, communications, electrical power supplies and buildings, that enable an organization, project or community to function. The facility near Inuvik that processes and separates gas and NGLs delivered from the gathering pipelines and which directs the processed streams to the NGL and gas pipelines. The metric symbol for kiloequivalents per hectare per year. A factor used to measure the status of a valued component. The metric symbol for kilograms per hectare per year. The metric symbol for kilometre. The abbreviation for kilometre post. The metric symbol for kilotonnes per year. The metric symbol for litre. A gathering pipeline that connects the production area facilities to the Inuvik area facility. The abbreviation for local study area. The activities associated with procuring, maintaining and transporting materials, equipment and personnel. The metric symbol for cubic metres. The abbreviation for Municipal and Community Affairs. The metric symbol for milligrams per litre. The elimination, reduction or control of a project s adverse effects, including restitution for any damage caused to the environment by such effects through avoidance, replacement, restoration, compensation or other means. The metric symbol for millimetres. The metric symbol for million cubic metres per day. GL-4 November 2005

5 monitoring N 2 O N/A NGL NGTL Niglintgak lateral NO 2 NO x non-point flow pad PAI particulate matter permafrost pipeline corridor PM 2.5 potential acid input process heater proponents, Mackenzie gathering system The act of maintaining regular surveillance over something over a period of time. The chemical symbol for nitrous oxide. The abbreviation for not applicable. The abbreviation for natural gas liquid. The abbreviation for NOVA Gas Transmission Ltd. The gathering pipeline connecting the Niglintgak gas conditioning facility to a connection point on the Taglu lateral at the outlet of the Taglu gas conditioning facility. The chemical symbol for nitrogen dioxide. The chemical symbol for oxides of nitrogen. Water introduced into a receiving stream from diffuse sources, i.e., without a single point of origin and not from a specific outlet. The surface parts of a multiwell drilling or production site, including wells, buildings, piping and electrical facilities. The abbreviation for potential acid input. Matter in the form of small liquid or solid particles. Perennially frozen ground, occurring wherever the ground temperature remains below 0 C for two or more consecutive years. The 1-km-wide area that centres on the combined right-of-way for the gas and NGL pipelines, from the Inuvik area facility south to the NGTL interconnect facility in Alberta. Respirable particulate matter with a nominal diameter smaller than 2.5 µm. The sum of the wet and dry deposition of sulphur and nitrogen compounds that have the potential to contribute to acidification of the receiving environment. Equipment for heating chemical process streams, e.g., gases, liquids or solids. Usually refers to furnaces, in contrast to heat exchangers. Imperial Oil Resources Ventures Limited, ConocoPhillips Canada (North) Limited, Shell Canada Limited and ExxonMobil Canada Properties. November 2005 GL-5

6 proponents, Mackenzie Valley pipeline reclamation reconnaissance right-of-way RSA SO 2 stockpile Storm Hills lateral t/d TBD topography valued component vegetated channel vegetation type watercourse Imperial Oil Resources Ventures Limited, the APG, ConocoPhillips Canada (North) Limited, Shell Canada Limited and ExxonMobil Canada Properties. The process of re-establishing a disturbed site to a former or other productive use, not necessarily to the same condition that existed before disturbance. The land capability might be at a level different, i.e., lower or higher, than that which existed before the disturbance, depending on the goal of the process. Reclamation includes the management of a disturbed site and revegetation where necessary. A mission to obtain information about the characteristics of a particular area. The easement in which the pipeline will be installed and operated. The abbreviation for regional study area. The chemical symbol for sulphur dioxide. A storage supply of something, such as line pipe or soil, to be used later. The gathering pipeline connecting the Storm Hills pigging facility to a connection point at the inlet of the Inuvik area facility. The metric symbol for tonnes per day. The abbreviation for to be determined. The natural surface features of a region, or the general configuration of a surface, including its relief. Characteristic or feature that represents important environmental conditions identified by assessment specialists, communities or stakeholders. A watercourse with ephemeral flow, no discernible banks or sediment transport, and a drainage area less than 15 km 2. It is primarily a shallow flow through shrubs and trees during spring runoff or rainfall. It is dry most of the year. A vegetation community or complex of communities that can be identified on air photos and is large enough to map. Vegetation types are clearly defined and named. A natural or artificial channel with perennial or intermittent flow and definable bed and banks. GL-6 November 2005