[Code of Federal Regulations]
[Title 40, Volume 29]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR436.181]

[Page 354-355]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 436_MINERAL MINING AND PROCESSING POINT SOURCE CATEGORY
--Table of Contents
 
                  Subpart R_Phosphate Rock Subcategory
 
Sec. 436.181  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 shall apply to this 
subpart.
    (b) The term ``mine dewatering'' shall mean any water that is 
impounded or that collects in the mine and is pumped, drained or 
otherwise removed from the mine through the efforts of the mine 
operator.
    (c) The term ``10-year 24-hour precipitation event'' shall mean the 
maximum 24 hour precipitation event with a probable reoccurrence 
interval of once

[[Page 355]]

in 10 years. This information is available in ``Weather Bureau Technical 
Paper No. 40,'' May 1961 and ``NOAA Atlas 2,'' 1973 for the 11 Western 
States, and may be obtained from the National Climatic Center of the 
Environmental Data Service, National Oceanic and Atmospheric 
Administration, U.S. Department of Commerce.
    (d) The term ``mine'' shall mean an area of land, surface or 
underground, actively used for or resulting from the extraction of a 
mineral from natural deposits.
    (e) The term ``process generated waste water'' shall mean any waste 
water used in the slurry transport of mined material, air emissions 
control, or processing exclusive of mining. The term shall also include 
any other water which becomes commingled with such waste water in a pit, 
pond lagoon, mine, or other facility used for settling or treatment of 
such waste water.

[43 FR 9809, Mar. 10, 1978]