Ill. Admin. Code tit. 35 § 364.207

Current through Register Vol. 48, No. 50, December 13, 2024

Section 364.207 - Classification of Aquatic Environments

Aquatic environments are classified according to the following:

a) Balanced environment: Intolerant organisms are many in number and species, or more in numbers than other forms present.

Intolerant present >50%

Moderate, facultative and tolerant usually present < 50%

b) Unbalanced environment: Intolerant organisms are less in number than other forms combined, but combined with moderate forms, they usually outnumber tolerant forms.

Intolerant present < 50% but >10%

Moderate, facultative and tolerant usually present > 50%

c) Semi-polluted environment: Intolerant organisms are few or may not be present. Moderate and/or facultative organisms present.

Intolerant present >10%

Moderate, facultative and tolerant usually present > 90%

d) Polluted environment:

1) Intolerant organisms absent, only tolerant organisms present or no organisms present.

Tolerant present = 100%

2) Organisms which are not adapted to inhabit a polluted environment are occasionally collected as a result of factors produced by the drift and are not representative.

Ill. Admin. Code tit. 35, § 364.207