Reference Concentration definition

Reference Concentration or “RfC" means an estimate of a daily exposure, in units of milligrams of chemical per cubic meter of air (mg/m(3)), to the human population (including sensitive subgroups) that is likely to be without appreciable risk of deleterious effects during a portion of a lifetime (up to approximately seven years, subchronic) or for a lifetime (chronic).

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Reference Concentration means a verified reference concentration developed by the United States environmental pro- tection agency which is an estimate of an exposure of the human population, including sensitive subgroups, to a hazardous air con- taminant that is likely to be without an appreciable risk of deleteri- ous effects during a lifetime. A reference concentration is based on continuous inhalation exposures to the hazardous air contami- nant and is expressed in units of micrograms per cubic meter (µg/m3).

Reference Concentration or "RfC" means an estimate, with uncertainty spanning an order of magnitude, of a continuous inhalation exposure to the human population, including sensitive subgroups, that is likely to be without appreciable risk of deleterious effects during a lifetime. It can be derived from a NOAEL, LOAEL, or BMD, with UFs generally applied to reflect limitations of the data used.

More Definitions of Reference Concentration

Reference Concentration means an estimate of a continuous exposure or a daily exposure to the human population (including sensitive populations) that is likely to be without an appreciable risk of adverse non-cancer effects during a lifetime. The reference concentration can be derived from various types of human or animal data, with uncertainty factors generally applied to reflect limitations of the data used.

Reference Concentration or “S(SRfCS) means an estimate of a daily exposure, in

Reference Concentration or “(RfC)" means an estimate of a daily exposure, in units of milligrams of chemical per cubic meter of air (mg/m(3)), to the human

Reference Concentration or “RfC” means an estimate of the continuous inhalation exposure to the human population, including sensitive subgroups and lifestages, that is likely to be without appreciable risk of adverse effect during a lifetime. The reference concentration is expressed in units of micrograms of hazardous substance per cubic meter of air.

Related to Reference Concentration

Net concentration means the difference between the concentration of a given substance in a sample taken of the discharge and the concentration of the same substances in a sample taken at the intake which supplies water to the given process. For the purpose of this definition, samples that are taken to determine the net concentration shall always be 24-hour composite samples made up of at least six increments taken at regular intervals throughout the plant day.
Baseline concentration means that ambient concentration level that exists in the baseline area at the time of the applicable minor source baseline date. A baseline concentration is determined for each pollutant for which a minor source baseline date is established and shall include the following:
Alcohol concentration means the number of grams of alcohol per 100 milliliters of blood or per 210 liters of breath.
Excess Concentration means the sum of the following amounts, without duplication:
Excess Concentration Amount means, as of any date of determination on which any one or more of the Concentration Limitations are exceeded, an amount (calculated by the Servicer and without duplication) equal to the Dollar Equivalent of the portion of the Adjusted Principal Balance of each Eligible Collateral Loan that causes such Concentration Limitation to be exceeded.