Idaho Administrative Code
Title IDAPA 58 - Environmental Quality, Department of
Rule 58.01.02 - WATER QUALITY STANDARDS
Section 58.01.02.284 - SOUTH FORK COEUR D'ALENE SUBBASIN, SUBSECTION 110.09, HUC 17010302, AQUATIC LIFE CRITERIA FOR CADMIUM, LEAD AND ZINC

Universal Citation: ID Admin Code 58.01.02.284

Current through August 31, 2023

The following criteria are to be met dependent upon the hardness, expressed as mg/l of calcium carbonate, of the water. Criterion maximum concentrations (CMC), one (1) hour average concentrations, and criterion continuous concentrations (CCC), four (4) day average concentrations, of the dissolved metals (in pg/l) are not to exceed, more than once every three (3) years, the values calculated using the following equations: (3-31-22)

01. Cadmium. (3-31-22)

a. CMC = 0.973 x e[(1.0166 x ln(hardness)) - 3.924] (3-31-22)

b. CCC = [1.101672 - (ln (hardness) x 0.041838] x e[(0.7852 x ln(hardness)) - 3.490] (3-31-22)

02. Lead. (3-31-22)

a. CMC = e[(0.9402 x ln(hardness)) + 1.1834] (3-31-22)

b. CCC = e[(0.9402 x ln(hardness)) - 0.9875] (3-31-22)

03. Zinc. (3-31-22)

a. CMC = e[(0.6624 x ln(hardness)) + 2.2235] (3-31-22)

b. CCC = e[(0.6624 x ln(hardness)) + 2.2235] (3-31-22)

04. Application. (3-31-22)

a. The maximum hardness allowed for use in the equations in Section 284 shall not be greater than four hundred (400) mg/l even if the actual ambient hardness is greater than four hundred (400) mg/l. (3-31-22)

b. The criteria described in Section 284 apply to all surface waters within the subbasin, except for natural lakes, for which the statewide criteria given in Section 210 apply. (3-31-22)

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