SUBTITLE C: WATER POLLUTION
CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY
PART 364 PROCEDURES AND REQUIREMENTS FOR DETERMINING CONSTRUCTION GRANT PRIORITIES FOR MUNICIPAL SEWAGE TREATMENT WORKS NEEDS
SECTION 364.207 CLASSIFICATION OF AQUATIC ENVIRONMENTS
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.
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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.
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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.
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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.