Chronic standard definition
Chronic standard means the four-day average concentration does not exceed the listed concentration more than once every three years.
Chronic standard means the level not to be exceeded by the concentration for either a single representative sample or calculated as an average of all samples collected during a thirty- day period, except for temperature, which shall be based on the WAT (see WAT definition). As used in tables II and III, chronic represents the level that protects 95 percent of the genera from chronic toxic effects. Chronic toxic effects include, but are not limited to, demonstrable abnormalities and adverse effects on survival, growth, or reproduction. The chronic standard is implemented in combination with a selected duration and frequency of recurrence (section 31.9(1)). In determining attainment of the applicable chronic standard, the representative nature of the data must be considered.
Chronic standard or "CS" means the highest water concentration of a toxicant to which organisms can be exposed indefinitely without causing chronic toxicity. Chronic standards are listed in parts 7050.0220 and 7050.0222.
More Definitions of Chronic standard
Chronic standard means the level not to be exceeded by the concentration for either a single representative sample or calculated as an average of all samples collected during a thirty- day period. As used in tables II and III, chronic represents the level that protects 90 to 95 percent of the genera from chronic toxic effects from unionized ammonia and 95 percent of the genera from chronic toxic effects from metals. Chronic toxic effects include, but are not limited to, demonstrable abnormalities and adverse effects on survival, growth, or reproduction. The chronic standard is implemented in combination with a selected duration and frequency of recurrence (section 31.9(1)).
Chronic standard. (CS) shall mean the highest water concentration of a toxicant to which aquatic organisms can be exposed indefinitely without causing chronic toxicity.
Chronic standard means the water quality standard that is intended to protect a beneficial use over a prolonged exposure period. This period is usually based on a 30 day average but may be shorter (4-7 day) or longer (lifetime exposure).
Chronic standard means a standard that applies to the arithmetic mean of samples collected during four consecutive days; chronic standards shall not be exceeded more than once every three years.