KERAPCD RULE 604 EPISODE STAGES
LAST REVISED 08/19/91

RULE 604 - Episode Stages - Adopted 1974, Renumbered 5/89, Amended 8/19/91

I. Health Advisory - An advisory is issued when the concentration of the pollutants specified for this stage is predicted or reached.

II. Stage 1 (Alert) - An alert is issued when the concentration of the pollutants specified for this stage is predicted or reached. Sources of specified pollutants or precursors must be notified. Abatement actions shall be initiated when this episode is declared.

III. Stage 2 (Warning) - A warning is called when the concentration of pollutants specified for this stage is predicted or reached. Abatement actions shall be taken with a minimum of delay to reduce the concentration of the pollutant or pollutants.

This is an intermediate stage; abatement actions needed will vary depending on the level of the concentrations and the anticipated duration of the episode.

IV. Stage 3 (Emergency) - An emergency is called when the conditions specified for this stage are reached; and in the case of the one hour criteria for carbon monoxide or oxidants, are predicted to persist for one additional hour. Extensive actions shall be taken to prevent exposure of persons to pollutant concentrations of the indicated levels.

V. Episode Termination - A stage is terminated whenever the concentration of the pollutant(s) which cause the declaration of the episode has been verified to have fallen below the criteria level for the declaration of the episode and meteorological data indicate that the pollutant concentration is expected to decrease.