Chronic Criteria definition

Chronic Criteria means the highest concentrations of toxic substances to which organisms can be exposed indefinitely without causing long-term harmful effects on growth and/or reproduction or other unacceptable effects (as measured by approved long-term exposure tests).
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Chronic Criteria means the threshold concentration of a substance that aquatic organisms can be exposed to for a period exceeding 96 hours with no resulting chronic toxicity.
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Chronic Criteria means the highest instream concentration of a toxic substance or an effluent to which organisms are able to be exposed for ninety-six (96) hours without causing an unacceptable harmful effect.
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Examples of Chronic Criteria in a sentence

  • EPA considers concentrations at the edge of the mixing zone higher than 0.011 mg/l (Chronic Criteria) to be toxic to aquatic organisms.

  • However, EPA considers concentrations at the edge of the mixing zone higher than 0.011 mg/l (Chronic Criteria) to be toxic to aquatic organisms.

  • EPA considers TRC concentrations at the edge of the mixing zone higher than 0.011 mg/l (Chronic Criteria) to be toxic to aquatic organisms.

  • EPA considers Total Recoverable Aluminum concentrations higher than 87 µg/l (Acute Criteria) and 750 µg/l (Chronic Criteria) to be toxic to aquatic organisms.

  • However, Chronic Criteria will be used in place of Acute Criteria and shall not be exceeded in waters of the Reservation.

  • The critical conditions for Outfall 001 are as follows: Outfall 001 – 7Q2 = 14.12 cfs (9.11 MGD), harmonic mean = 32.80 cfs, Chronic Criteria – Mixing Zone (MZ) = 3.16%; Acute Criteria – Zone of Initial Dilution (ZID) = 11.53%; Human Health Criteria (HH) = 1.38%.

  • Saltwater and Estuarine Chronic Criteria for Ammonia.(1) Chronic numeric toxic substance criteria for ammonia to protect marine and estuarine life are shown in Table 1.(2) Averaging Period.

  • US EPA Chronic Criteria (30-day average) for Fish Early Life Stages Present (USEPA, 1999) and respective ammonia concentrations for temperature and pH extremes measured at Hood and Grand Island.

  • A third issue raised by the Respondents in Dispute Resolution relates to the use of dissolved metals data, as well as total metals, in calculating Marine Chronic Criteria (MCC) AWQC under WAC 173-201A-040, footnote dd.

  • The constituent concentration results were compared to the marine sediment Effects Range Low (ERL) criteria (Page 38, Appendix 4, Table 4, NYSDEC 1999) and, for non-polar organic compounds not listed in Table 4 of the guidance, constituent concentration results were compared to the equilibrium partitioning-derived values for saltwater in Table 1 on pages 20 to 24 of the guidance (Benthic Chronic Criteria).


More Definitions of Chronic Criteria

Chronic Criteria means the four-day average concentration of a pollutant in ambient water which should not be exceeded more than once every three years on average. Generally, chronic criteria thresholds are lower than those for acute criteria.
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Related to Chronic Criteria

  • Chronic condition means a condition that can be treated or managed, but not cured.

  • Chronic toxicity means concurrent and delayed adverse effects that occur only as a result of a chronic exposure.

  • Evaluation Criteria means the criteria set out under the clause 27 (Evaluation Process) of this Part C, which includes the Qualifying Criteria, Functional Criteria and Price and Preferential Points Assessment.

  • Electronic Control System means a combination of units, designed to co-operate in the production of the stated vehicle control function by electronic data processing. Such systems, often controlled by software, are built from discrete functional components such as sensors, electronic control units and actuators and connected by transmission links. They may include mechanical, electro-pneumatic or electro-hydraulic elements.

  • Clinical review criteria means the written screening procedures, decision abstracts, clinical protocols, and practice guidelines used by a health carrier to determine the necessity and appropriateness of health care services.

  • Specific goals means specific goals as contemplated in section 2(1)(d) of the PPPFA which may include contracting with persons, or group of persons, historically disadvantaged by unfair discrimination on the basis of race, gender and disability including the implementation of programmes of the Reconstruction and Development Programme as published in Government Gazette No. 16085 dated 23 November 1994.

  • Review Criteria has the meaning assigned to that term in Section 12.02(b)(i).