[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: 40CFR421.41]

[Page 478]
 
                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.