[Code of Federal Regulations]

[Title 40, Volume 28]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR421.42]



[Page 475]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 421_NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY--Table 

of Contents

 

              Subpart D_Primary Copper Smelting Subcategory

 

Sec.  421.42  Effluent limitations guidelines representing the degree of 

effluent reduction attainable by the application of the best practicable 

control technology currently available.



    (a) Except as provided in 40 CFR 125.30 through 125.32 and paragraph 

(b) of this section, 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 

practicable control technology currently available (BPT): There shall be 

no discharge of process wastewater pollutants to navigable waters.

    (b) A process wastewater impoundment which is designed, constructed, 

and operated so as to contain the precipitation from the 10-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 10-year, 

24-hour rainfall event, when such event occurs.