[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: 40CFR421.65]

[Page 484]
 
                TITLE 40-PROTECTION OF ENVIRONMENT
 
      CHAPTER I-ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 421-NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY--Table of Contents
 
              Subpart F-Secondary Copper Subcategory
 
Sec. 421.65  Pretreatment standards for existing sources.

    Except as provided in 40 CFR 403.7 and 403.13, any existing source 
subject to this subpart which introduces pollutants into a publicly 
owned treatment works must comply with 40 CFR part 403 and achieve the 
following pretreatment standards for existing sources. The mass of 
wastewater pollutants in secondary copper process wastewater introduced 
into a POTW shall not exceed the following values:
    (a) There shall be no discharge of process wastewater pollutants 
into a publicly owned treatment works subject to the provisions of 
paragraph (b) of this section.
    (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 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.