[Code of Federal Regulations]
[Title 40, Volume 18]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR125.71]

[Page 311]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 125--CRITERIA AND STANDARDS FOR THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM--Table of Contents
 
  Subpart H--Criteria for Determining Alternative Effluent Limitations 
                     Under Section 316(a) of the Act
 
Sec. 125.71  Definitions.

    For the purpose of this subpart:
    (a) Alternative effluent limitations means all effluent limitations 
or standards of performance for the control of the thermal component of 
any discharge which are established under section 316(a) and this 
subpart.
    (b) Representative important species means species which are 
representative, in terms of their biological needs, of a balanced, 
indigenous community of shellfish, fish and wildlife in the body of 
water into which a discharge of heat is made.
    (c) The term balanced, indigenous community is synonymous with the 
term balanced, indigenous population in the Act and means a biotic 
community typically characterized by diversity, the capacity to sustain 
itself through cyclic seasonal changes, presence of necessary food chain 
species and by a lack of domination by pollution tolerant species. Such 
a community may include historically non-native species introduced in 
connection with a program of wildlife management and species whose 
presence or abundance results from substantial, irreversible 
environmental modifications. Normally, however, such a community will 
not include species whose presence or abundance is attributable to the 
introduction of pollutants that will be eliminated by compliance by all 
sources with section 301(b)(2) of the Act; and may not include species 
whose presence or abundance is attributable to alternative effluent 
limitations imposed pursuant to section 316(a).