Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 302 - WATER QUALITY STANDARDS
Subpart E - LAKE MICHIGAN BASIN WATER QUALITY STANDARDS
Section 302.563 - Determining the Tier II Lake Michigan Basin Acute Aquatic Life Toxicity Value (LMAATV)

Universal Citation: 35 IL Admin Code ยง 302.563

Current through Register Vol. 48, No. 38, September 20, 2024

If all eight minimum data requirements for calculating a FAV using Tier I procedures are not met, a Tier II LMAATV must be calculated for a substance as follows:

a) The lowest GMAV in the database is divided by the Secondary Acute Factor (SAF) corresponding to the number of satisfied minimum data requirements listed in the Tier I methodology (Section 302.553). To calculate a Tier II LMAATV, the database must contain, at a minimum, a GMAV for one of the following three genera in the family Daphnidae - Ceriodaphnia sp., Daphnia sp., or Simocephalus sp. The Secondary Acute Factors are:

Number of Minimum data requirements satisfied (required taxa)

Secondary Acute Factor

1

43.8

2

26.0

3

16.0

4

14.0

5

12.2

6

10.4

7

8.6

b) If dependent on a water quality characteristic, the Tier II LMAATV must be calculated according to Section 302.560.

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