[Code of Federal Regulations]
[Title 40, Volume 26]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR415.23]

[Page 251]
 
                TITLE 40-PROTECTION OF ENVIRONMENT
 
      CHAPTER I-ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 415-INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY--Table of Contents
 
        Subpart B-Aluminum Sulfate Production Subcategory
 
Sec. 415.23  Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology 
          economically achievable (BAT).

    Except as provided in 40 CFR 125.30 through 125.32, any existing 
point source subject to this subpart must achieve the following effluent 
limitations representing the degree of effluent reduction attainable by 
the application of the best available technology economically achievable 
(BAT):
    (a) Subject to the provisions of paragraph (b) of this section there 
shall be no discharge of process wastewater pollutants into navigable 
waters.
    (b) A process wastewater impoundment which is designed, constructed, 
and operated so as to contain the precipitation from the 25-year, 24-
hour rainfall event as established by the National Climatic Center, 
National Oceanic and Atmospheric Administration for the area in which 
such impoundment is located may discharge that volume of process 
wastewater which is equivalent to the volume of precipitation that falls 
within the impoundment in excess of that attributable to the 25-year, 
24-hour rainfall event, when such event occurs.