Ill. Admin. Code tit. 35, § 302.621 - Determining the Acute Aquatic Toxicity Criterion - Procedure for Combinations of Substances
An AATC for any combination of substances (including effluent mixtures) must be determined by the following toxicity testing procedures:
a) Not more than 50% of
test organisms from the most sensitive species tested may exhibit mortality or
immobility after a 48-hour test for invertebrates or a 96-hour test for
fish.
b) Three resident or
indigenous species of ecologically diverse taxa must be tested initially. If
resident or indigenous species are not available for testing, non-resident
species may be used if the non-resident species is of the same family or genus
and has a similar habitat and environmental tolerance.
Notes
Added at 14 Ill. Reg. 2899, effective February 13, 1990
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An AATC for any combination of substances (including effluent mixtures) must be determined by the following toxicity testing procedures:
a) Not more than 50% of test organisms from the most sentitive species tested may exhibit mortality or immobility after a 48-hour test for invertebrate or a 96-hour test for fishes.
b) Three resident or indigenous species of ecologically diverse taxa must be tested initially. If resident or indigenous species are not available for testing, non-resident species may be used if the non-resident species is of the same family or genus and has a similar habitat and environmental tolerance.
Notes
Added at 14 Ill. Reg. 2899, effective February 13, 1990