[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: 40CFR421.41]



[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.  421.41  Specialized definitions.



    For the purpose of this subpart:

    (a) Except as provided below, the general definitions, 

abbreviations, and methods of analysis set forth in 40 CFR part 401 

apply to this subpart.

    (b) In the event that the waste streams covered by this subpart are 

combined for treatment or discharge with waste streams covered by 

Subparts E--Primary Electrolytic Copper Refining and/or Subpart I--

Metallurgical Acid Plants, the quantity of each pollutant or pollutant 

property discharged shall not exceed the quantity of each pollutant or 

pollutant property which could be discharged if each waste stream were 

discharged separately.

    (c) For all impoundments constructed prior to the effective date of 

the interim final regulation (40 FR 8513), the term ``within the 

impoundment,'' when used to calculate the volume of process wastewater 

which may be discharged, means the water surface area within the 

impoundment at maximum capacity plus the surface area of the inside and 

outside slopes of the impoundment dam as well as the surface area 

between the outside edge of the impoundment dam and any seepage ditch 

adjacent to the dam upon which rain falls and is returned to the 

impoundment. For the purpose of such calculations, the surface area 

allowances set forth above shall not exceed more than 30 percent of the 

water surface area within the impoundment dam at maximum capacity.

    (d) For all impoundments constructed on or after the effective date 

of the interim final regulation (the interim regulation was effective 

February 27, 1975; 40 FR 8513, February 27, 1975), the term ``within the 

impoundment,'' for purposes of calculating the volume of process 

wastewater which may be discharged, means the water surface area within 

the impoundment at maximum capacity.