[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: 40CFR421.15]

[Page 463]
 
                TITLE 40-PROTECTION OF ENVIRONMENT
 
      CHAPTER I-ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 421-NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY--Table of Contents
 
              Subpart A-Bauxite Refining Subcategory
 
Sec. 421.15  Standards of performance for new sources.

    (a) Subject to the provisions of paragraph (b) of this section, the 
following standards of performance establish the quantity or quality of 
pollutants or pollutant properties which may be discharged by a new 
source subject to the provisions of this subpart: There shall be no 
discharge of process waste water pollutants to navigable waters.
    (b) During any calendar month there may be discharged from the 
overflow of a process waste water impoundment either a volume of process 
waste water equal to the difference between the precipitation for that 
month that falls within the impoundment and the evaporation within the 
impoundment for that month, or, if greater, a volume of process waste 
water equal to the difference between the mean precipitation for that 
month that falls within the impoundment and the mean evaporation for 
that month as established 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).

[39 FR 12825, Apr. 8, 1974]