This glossary contains terms you may run across on this site or in some other EHS context.
Ignitable: Capable of burning or causing a fire.
Impoundment: A body of water or sludge confined by a dam, dike, floodgate, or other barrier (see Surface Impoundment). For more information, see the Surface Impoundments topic page.
Immediately Dangerous to Life and Health (IDLH): The maximum level of a chemical a healthy individual may be exposed to for 30 minutes without suffering irreversible health effects or impairing symptoms.
Incineration: 1: Burning of certain types of solid, liquid, or gaseous materials. 2: Treatment technology involving destruction of waste by controlled burning at high temperatures. For more information, see the Incineration topic page.
Incinerator: A furnace for burning wastes under controlled conditions. For more information, see the Incineration topic page.
Indirect Discharge: Introduction of pollutants from a non-domestic source into a publicly owned waste treatment system. Indirect dischargers may be commercial or industrial facilities whose wastes go into local sewers.
Individual Permit: A water discharge permit issued to an individual discharger. Dischargers can apply individually or as a group for an individual permit.
Indoor Air Pollution: Chemical, physical, or biological contaminants in indoor air. For more information, see the Ventilation topic page.
Infiltration: 1: The penetration of water through the ground surface into sub-surface soil, or the penetration of water from the soil into sewer or other pipes through defective joints, connections, or manhole walls. 2: A land application technique where large volumes of wastewater are applied to land, allowed to penetrate the surface and percolate through the underlying soil.
Influent: Water, wastewater, or other liquid flowing into a reservoir, basin, or treatment plant.
In-Ground Tank: A hazardous waste storage tank in which a portion of the tank wall is situated to any degree within the ground that prohibits visual inspection of that external surface area of the tank that is in the ground.
Injection Well: A well into which fluids are injected for waste disposal, to improve the recovery of crude oil, or for solution mining. For more information, see the Underground Injection Wells topic page.
Injection Zone: A geological formation, group of formations, or part of a formation receiving fluids through a well.
Insecticide: A pesticide compound specifically used to kill or control the growth of insects. For more information, see the Pesticides topic page.
Inspection and Maintenance: 1: Activities to ensure proper emissions-related operation of mobile sources of air pollutants, particularly automobile emissions controls. 2: Also applies to wastewater treatment plants and other anti-pollution facilities and processes.
Interim (Permit) Status: Period during which a treatment, storage, and disposal facility (TSDF) coming under RCRA in 1980 is temporarily permitted to operate while awaiting denial or issuance of a permanent permit. Interim-status permits also are called “Part A” permits.
Interstitial Monitoring: The continuous surveillance of the space between the walls of an underground storage tank.
Inventory: Toxic Substances Control Act inventory of chemicals produced under section 8(b) of TSCA.
Irrigation: Technique for applying water or wastewater to land areas to supply the water and nutrient needs of plants.
ISO: A series of ISO 14000 Environmental Management Standards have been published by the International Organization for Standardization (ISO)—ISO 14001 and ISO 14004 focus on environmental management tools and systems that can be integrated into existing operations, ISO 14010 (principles of environmental auditing), ISO 14011 (auditing procedures), and ISO 14012 (qualification criteria for environmental auditors).
Joint and Several Liability: Refers to the sharing of liability among a group of people collectively and also individually.
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