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IA

Interagency Agreement.

IAEA

international Atomic Energy Agency.

IAG

Interagency Agreement.

IAP

Indoor Air Pollution.

IAQ

Indoor Air Quality.

IARC

International Agency for Research on Cancer. One of the three sources that OSHA refers to for data on a material's carcinogenicity. (World Health Organization, Geneva , Switzerland ; distributed in the USA from 49 Sheridan Avenue , Albany , NY 12210 (518) 436-9686).

IARDB

Interim Air Toxics Data Base.

IBA

Industrial Biotechnology Association.

IC

Incident Commander

IC

Ion Chromatography.

ICAP

Inductively Coupled Argon Plasma.

ICBN

International Commission on the Biological Effects of Noise.

ICC

Interstate Commerce Commission.

IC50

A calculated statistical value whereby a concentration causes inhibition of an effect, behavior, or biological action to 50% of the treated subjects or animals.

ICP

Inductively Coupled Plasma.

ICP-AES

Inductively Coupled Plasma-Atomic Emission Spectrophotometry.

ICRD

Ignitability, Corrosivity, Reactivity, Extraction.

ICS

Incident Command System

ICWM

Institute for Chemical Waste Management.

ID

Inside Diameter.

identity

Any chemical or common name which is indicated on the material safety data sheet (MSDS) for the chemical. The identity used shall permit cross-references to be made among the required list of hazardous chemicals, the label and the MSDS.

IDLH

immediately dangerous to life and health. Used to determine selection of a respirator. The maximum concentration from which one could escape within 30 minutes without any escape-impairing symptoms or irreversible health effects. Also, IDLH conditions and conditions that would lead to an IDLH exposure.

IEB

International Environment Bureau.

IEMP

Integrated Environmental Management Project.

IF-25

Flocculant/Coagulant - Clarification/Settling (ETUS).

IFB

Invitation for Bid.

IFCAM

Industrial Fuel Choice Analysis Model.

IFIS

Industry File Information System.

IFPP

Industrial Fugitive Process Particulate.

IG

Inspector General.

ignitable

capable of burning or causing a fire.

ignition temperature

the lowest temperature at which a combustible material ignites in air and continues to burn independently of the source of heat.

IH-24

Acid Type Cheater (ETUS).

I&M

Inspection & Maintenance.

IMDG Code, IMO Classification

The IMDG (International Maritime Dangerous Goods) Code assigns divisions, classes, and codes to materials in shipment. These are explosives, flammables, oxidizers, poisons, corrosives, and other regulated substances. The code also assigns labeling and the DOT UN/NA and Pins. (International Maritime Organization, 4 Albert Embankments, London , SE 175R, United Kingdom ).

Immediate hazard

A hazard with immediate effect(s). See acute health effects.

Immediately dangerous to life and health (IDLH)

the maximum level to which a healthy individual can be exposed to a chemical for 30 minutes and escape without suffering irreversible health effects or impairing symptoms. Used as a level of concern". (See: level of concern).

IMPACT

Integrated Model of Plumes and Atmosphere in Complex Terrain.

Impedance

the rate at which a substance absorbs and transmits sound.

Impervious

describes a material that does not allow another substance to penetrate or pass through it.

Implementing agency

Means EPA, or, in the case of a state with a program approved under section 9004 (or pursuant to a memorandum of agreement with EPA), the designated state or local agency responsible for carrying out an approved UST program.

Implementation plan

An outline of steps needed to meet environmental quality standards by a set time.

Importer

The first business with employees within the Customs Territory of the United States which receives hazardous chemicals produced in other countries for the Purpose of supplying them to distributors or employers within the United States .

Impoundment

A body of water confined by a dam, dike, floodgate, or other barrier.

IMPROVE

Interagency Monitoring of Protected Visual Environment.

Incident/Accident

Refers to a release or the potential for a release of a hazardous material.

Incident Command System

Refers a system to manage the combination of facilities, equipment, personnel, procedures, and communications operating within a common organizational structure with responsibility for the management of assigned resources to effectively accomplish stated objectives pertaining to an incident.

Incident Commander

Refers to the individual responsible for the management of all incident operations.

Incineration

(1) Burning of certain types of solid, liquid or gaseous materials. (2) a treatment technology involving destruction of waste by controlled burning at high temperatures, e.g., burning sludge to remove the water and reduce the remaining residues to a safe, non-burnable ash which can be disposed of safely on land, in some waters or in underground locations.

Incineration at sea

Disposal of waste by burning at sea on specially-designed incinerator ships.

incinerator

a controlled chamber where waste substances are burned.

incompatible

describes materials that could cause dangerous reactions and the release of energy from direct contact with one another.

incompatible pollutants

those pollutants which would cause harm to, adversely affect the performance of, or be inadequately treated in publicly owned treatment works.

indian tribe

as defined by section 101(36) of CERCLA, means any Indian tribe, band, nation, or other organized group or community, including any Alaska Native village but not including any Alaska Native regional or village corporation, which is recognized as eligible for the special programs and services provided by the United States to Indians because of their status as Indians.

indicator

in biology, an organism, species, or community that shows the presence of certain environmental conditions.

indirect discharge

introduction of pollutants from a non- domestic source into a publicly owned waste treatment system Indirect dischargers can be commercial or industrial facilities whose wastes go into the local sewers.

indoor air

the breathing air inside a habitable structure or conveyance.

indoor air pollution

chemical, physical, or biological contaminants in indoor air.

indoor climate

temperature, humidity, lighting and noise levels in a habitable structure or conveyance. Indoor climate can affect indoor air pollution.

industrial wastes

liquid wastes from industrial processes, as distinct from domestic or sanitary wastes.

inert gas

a vapor that doesn't react with other substances under ordinary conditions.

inert ingredient

anything other than the active ingredient in a product; not having active properties. Inert ingredients may be hazardous. For example, the propellant gas in aerosol spray can products such as hair spray is flammable.

inert media

a resin with no reactive groups.

inertial separator

a device that uses centrifugal force to separate waste particles.

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 waste water are applied to land, allowed to penetrate the surface and percolate through the underlying soil. (See: percolation).

inflammable

capable of being easily set on fire and continuing to burn, especially violently.

inflammation

a series of reactions produced in tissue by an irritant, injury, or infection. An influx of blood and fluids causes redness and swelling.

inflow

entry of extraneous rain water into a sewer system from sources other than infiltration, such as basement drains, manholes, storm drains, and street washing.

influent

water, wastewater, or other liquid flowing into a reservoir, basin, or treatment plant.

information file

in the Superfund program, a file that contains accurate, up-to-date documents on a Superfund site. The file is usually located in a public building such as a school, library, or city hall that is convenient for local residents.

ingestion

the taking in of a substance through the mouth for digestion.

inhalation, ihl.

the breathing in of a substance in the form of a gas, vapor, fume, mist, or dust.

inhalation hazard

DOT A chemical that is a liquid having a saturated vapor concentration (ppm) at 68¿F (20¿C) equal to or greater than ten times its LC50 (vapor) value (ppm), if the LC50 value is 1000 parts per million (ppm) or less when administered by continuous Inhalation for 1 hour (or less, if death occurs within I hour) to albino rats weighing between 200 and 300 grams each, provided such concentration, or condition, or both, are likely to be encountered by man when the chemical is used in any reasonable foreseeable manner.

INHIBIT

Cooling Water Treatment (ETUS).

inhibitor

a chemical that interferes with a chemical reaction, such as corrosion or precipitation.

injection well

a well into which fluids are injected for purposes such as waste disposal, improving the recovery of crude oil, or solution mining.

injection zone

a geological formation, group of formations, or part of a formation receiving fluids through a well.

inland waters

for the purposes of classifying the size of discharges, means those waters of the United States in the inland zone, waters of the Great Lakes , and specified ports and harbors on inland rivers.

inland zone

means the environment inland of the coastal zone excluding the Great Lakes and specified ports and harbors on inland rivers. The term inland zone delineates an area of federal responsibility for response action. Precise boundaries are determined by EPA/USCG agreements and identified in federal regional contingency plans.

Innocent landowner defense

legal defense under Superfund for a person who unknowingly purchase contaminated property after exercising "due diligence" to uncover contamination prior to acquisition.

inoculum

(1) bacteria placed in compost to start biological action. (2) a medium containing organisms which is introduced into cultures or living organisms.

inorganic

compounds not containing carbon. Non plant or animal.

inorganic chemicals

chemical substances of mineral origin, not of basically carbon structure.

inorganic materials

compounds derived from other than vegetable or animal sources that do not generally contain carbon atoms. Some simple carbon compounds are considered inorganic (i.e., carbides, COx, carbonates, CS2).

insecticide

a pesticide compound specifically used to kill or control the growth of insects.

in situ

refers to treatment of contaminated areas without excavation or other removal, as in the in situ treatment of soils through biodegradation of contaminants.

inspection and maintenance (I/M)

(1) activities to assure 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.

instream use

water use taking place within a stream channel, e.g., hydro-electric power generation, navigation, water-quality.

intake

a measure of exposure expressed as the mass of substance in contact with the exchange boundary per unity body weight per unit time (e.g., mg/kg-day). Also termed the normalized exposure rate.

integrated pest management

combining the best of all useful techniques -- biological, chemical, cultural, physical, and mechanical -- into a custom-made pest control system.

Integrated Risk Information System (IRIS)

IRIS is an EPA data base containing verified RfDs and slope factors and up-to-date health risk and EPA regulatory information for numerous chemicals.IRIS is EPA's preferred source for toxicity information for Superfund.

interceptor sewers

the collection system that connects main and trunk sewers with the wastewater treatment plant. In a combined sewer system interceptor sewers allow some untreated wastes to flow directly into the receiving streams so the plant won't be overloaded.

interface

the surface between two resins, or resin and a distributor.

interim (permit) status

period during which treatment, storage and disposal facilities coming under RCRA in 1980 are temporarily permitted to operate while awaiting denial or issuance of a permanent permit. Permits issued under these circumstances are usually called "Part A" or "Part B" permits.

interlock

a device which will prevent one action from happening while another action is proceeding.

international programmers registry

an international listing service for programmers provided by SOLUTIONS Software Corporation.

Interstitial Fibrosis

scarring of the lungs.

interstate carrier water supply

a source of water for planes, buses, trains, and ships operating in more than one State. These sources are regulated by the Federal Government.

interstate waters

defined by law as: 1) waters that flow across for form a part of State or international boundaries 2) the Great Lakes and 3) coastal waters.

interstitial monitoring

the continuous surveillance of the space between the walls of an underground storage tank.

intubation

The administration of a test dose through a tube put or placed into the nose, throat, or larynx.

inventory

TSCA inventory of chemicals produced pursuant to Section 8 (b) of the Toxic Substances Control Act.

inversion

an atmospheric condition caused by a layer of warm air preventing the rise of cool air trapped beneath it. This holds down pollutants that might otherwise be dispersed, and can cause an air pollution episode.

in vitro

(1) "in glass"; a test-tube culture. (2) any laboratory test using living cells taken from an organism.

in vivo

in the living body of a plant or animal. In vivo tests are those laboratory experiments carried out on whole animals or human volunteers.

ion

an atom or radical in solution carrying an integral electric charge, either positive (cation) or negative (anion).

ion exchange

a reversible chemical reaction between a solid (ion exchanger) and a fluid (usually a water solution) by means of which ions may be interchanged from one substance to another. The superficial physical structure of the solid is not affected.

ion exchange treatment

a common water softening method often found on a large scale at water purification plants that remove some organics and radium by adding calcium oxide or calcium hydroxide to increase the pH to a level where the metals will precipitate out.

ionic strength

a measure of the strength of a solution based on both the concentration and valences of the ions present.

ionization chamber

a device that detects ionizing radiation.

ionizing radiation

radiation that can remove electrons from atoms, i.e., alpha, beta, and gamma radiation.

I.P.

Intraperitoneally. Within the peritoneal cavity. A route of administration. [10] The material is injected into the peritoneal (abdominal/pelvic) cavity.

IP

Induced Polarization.

IP

Inhalable Particles.

IPCS

International Program on Chemical Safety.

IPM

Inhalable Particulate Matter.

IPM

Integrated Pest Management.

IPP

Implementation Planning Program.

IPP

Integrated Plotting Package.

IPP

Intermedia Priority Pollutant.

IR

Infrared.

IR

Installation Restoration.

IRA

Interim Response Action.

IRDS

primary irritation dose.

IRG

Interagency Review Group.

iridocyclitis

inflammation of both the eye's iris and its ciliary body.

IRIS

Instructional Resources Information System.

IRIS

Integrated Risk Information System.

iritis

Inflammation of the iris, the circular pigmented membrane behind the cornea, perforated by the pupil. [10] EXAMPLE LAY LANGUAGE: Eye irritation.

IRM

Interim Remedial Measures.

IRMC

Inter-Regulatory Risk Management Council.

iron bacteria

organisms which are capable of using ferrous iron, either from the water or from steel pipe, in their metabolism and precipitating ferric hydroxide in their sheaths and gelatinous deposits.

IRP

Installation Restoration Process.

IRP

Installation Restoration Program.

IRPTC

International Register of Potentially Toxic Chemicals.

IRR

irritant effects. Any irritant effect on the skin, eye, or mucous membrane.

irritant

a noncorrosive material that causes a reversible inflammatory effect on living tissue by chemical action at the site of contact as a function of concentration or duration of exposure.

irritating material

-DOT A liquid or solid substance which upon contact with fire or when exposed to air gives off dangerous or intensely irritating fumes, such as brombenzylcyanide, chloracetophenone, diphenylaminechlorarsine, and diphenylchlorarsine, but not including any poisonous material, Class A.

irradiated food

food that has been subject to brief radioactivity, usually by gamma rays, to kill insects, bacteria, and mold, and preserve it without refrigeration or freezing.

irradiation

exposure to radiation of wavelengths shorter than those of visible light (gamma, x-ray, or ultraviolet) for medical purposes, the destruction of bacteria in milk or other foodstuffs, or for inducing polymerization of monomers or vulcanization of rubber.

irrigation

technique for applying water or wastewater to land areas to supply the water and nutrient needs of plants.

IRS

Internal Revenue Service.

IS

Interim Status.

ISC

Industrial Source Complex.

ISCL

Interim Status Compliance Letter.

ISD

Interim Status Document.

ISMAP

Indirect Source Model for Air Pollution.

isomers

chemical compounds with the same molecular weight and atomic composition but differing molecular structure; e.g., n-pentane and 2-methylbutane.

isotope

a variation of an element that has the same atomic number but a different weight because of its neutrons.Isotopes of an element may have different radioactive behavior.

Issues

refers to observed or identified problems in an organization's performance in the demonstration of exercise objectives.

ISV

In Situ Vitrification.

ISWMP

Integrated Solid Waste Management Plan.

ITC

Interagency Testing Committee.

ITC

International Trade Commission.

ITP

Individual Training Plan.

ITR

Innovative Technology Requirement.

I.V.

Injection into a vein.

IWC

In-Stream Waste Concentration.

 

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