[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: 40CFR421.62]



[Page 479-480]

 

                   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



[[Page 480]]



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]