[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: 40CFR421.62]

[Page 483]
 
                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. 421.62  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, any existing 
point source subject to this subpart shall achieve the following 
effluent limitations representing the degree of effluent reduction 
attainable by the application of the best practicable technology 
currently available: Subject to the provisions of paragraphs (b), (c), 
and (d) 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 10-year, 24-
hour rainfall event as established by the National Climatic Center, 
National Oceanic and Atmospheric Administration for the areas 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.
    (c) During any calendar month there may be discharged from a process 
wastewater impoundment either a volume of process wastewater equal to 
the difference between the precipitation for the month that falls within 
the impoundment and either the evaporation from the pond water surface 
area for that month, or a volume of process wastewater equal to the 
difference between the mean precipitation for that month that falls 
within the impoundment and the mean evaporation from the pond water 
surface area as establsihed by the National Climatic Center, National 
Oceanic and Atmospheric Administration, for the area in which such 
impoundment is located (or as otherwise determined if no monthly data 
have been established by the National Climatic Center), whichever is 
greater.
    (d) Any process wastewater discharged pursuant to paragraph (c) of 
this section shall comply with each of the following requirements:

------------------------------------------------------------------------
                                                Effluent characteristic
                                             ---------------------------
                                                             Average of
                                                            daily values
            Effluent limitations               Maximum for     for 30
                                                any 1 day    consecutive
                                                             days shall
                                                             not exceed
------------------------------------------------------------------------
                                                  Metric Units (mg/l)

                                                  English Units (ppm)

                                             ---------------
TSS.........................................          50           25
Cu..........................................           0.5          0.25
Zn..........................................          10            5
Oil and grease..............................          20           10
pH..........................................       (\1\)        (\1\)
------------------------------------------------------------------------
\1\ Within the range of 6.0 to 9.0.


[49 FR 8802, Mar. 8, 1984; 49 FR 26739, June 29, 1984]