18 AAC 70.040. Procedure for applying water quality criteria

In applying the appropriate water quality criteria for any waterbody or portion of a waterbody, the department will use the following procedure:

(1) if a waterbody is protected for more than one use class under 18 AAC 70.050 or 18 AAC 70.230(e) , the most stringent water quality criteria for all the included use classes will apply;

(2) at the boundary between waters protected for different use classes under 18 AAC 70.050 or 18 AAC 70.230(e) , the water quality criteria for the more stringent use class will apply; and

(3) in estuaries, where the fresh and marine water quality criteria differ within the same use class, the standard will be determined on the basis of salinity; however, the marine water quality criteria will apply for

(A) dissolved oxygen if the salinity is one part per thousand or greater; and

(B) fecal coliform bacteria if the salinity is 10 parts per thousand or greater.

History: Eff. 11/1/97, Register 143

Authority: AS 46.03.020

AS 46.03.070

AS 46.03.080

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