[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: 40CFR440.72]

[Page 420-421]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 440_ORE MINING AND DRESSING POINT SOURCE CATEGORY
--Table of Contents
 
                    Subpart G_Nickel Ore Subcategory
 
Sec. 440.72  Effluent limitations representing the degree of effluent reduction attainable 
by the application of the best practicable control technology 
          currently available (BPT).

    Except as provided in subpart L of this part and 40 CFR 125.30 
through 125.32, any existing point source subject to this subpart must 
achieve the following effluent limitations representing the degree of 
effluent reduction attainable by the application of the best practicable 
control technology currently available (BPT):
    (a) The concentration of pollutants discharged in mine drainage from 
mines producing 5000 metric tons (5512 short tons) or more of nickel 
bearing ores per year shall not exceed:

[[Page 421]]



------------------------------------------------------------------------
                                                 Effluent limitations
                                             ---------------------------
                                                             Average of
           Effluent characteristic                          daily values
                                               Maximum for     for 30
                                                any 1 day    consecutive
                                                                days
------------------------------------------------------------------------
                                                 Milligrams per liter
                                             ---------------------------
TSS.........................................         30            20
Cd..........................................           .10           .05
Cu..........................................           .3            .15
Zn..........................................          1.0            .5
Pb..........................................           .6            .3
As..........................................          1.0            .5
pH..........................................      (\1\)         (\1\)
------------------------------------------------------------------------
\1\ Within the range 6.0 to 9.0.

    (b) The concentration of pollutants discharged in mine drainage from 
mines producing less than 5,000 metric tons (5,512 short tons) or 
discharged from mills processing less than 5,000 metric tons (5,512 
short tons) of nickel ores per year by methods other than ore leaching 
shall not exceed:

------------------------------------------------------------------------
                                                  Effluent limitations
                                               -------------------------
                                                              Average of
                                                                daily
            Effluent characteristic             Maximum for   values for
                                                 any 1 day        30
                                                             consecutive
                                                                 days
------------------------------------------------------------------------
                                                  Milligrams per liter
                                               -------------------------
TSS...........................................           50           30
pH............................................        (\1\)        (\1\)
------------------------------------------------------------------------
\1\ Within the range 6.0 to 9.0.

    (c) The concentration of pollutants discharged from mills processing 
5,000 metric tons (5,512 short tons) or more of nickel ores per year by 
purely physical methods including ore crushing, washing, jigging, heavy 
media separation and magnetic and electrostatic separation shall not 
exceed:

------------------------------------------------------------------------
                                                 Effluent limitations
                                             ---------------------------
                                                             Average of
           Effluent characteristic                          daily values
                                               Maximum for     for 30
                                                any 1 day    consecutive
                                                                days
------------------------------------------------------------------------
                                                 Milligrams per liter
                                             ---------------------------
TSS.........................................         30            20
Cd..........................................           .10           .05
Cu..........................................           .30           .15
Zn..........................................          1.0            .5
As..........................................          1.0            .5
pH..........................................      (\1\)         (\1\)
------------------------------------------------------------------------
\1\ Within the range 6.0 to 9.0

    (d) The concentration of pollutants discharged from mills processing 
5,000 metric tons (5,512 short tons) or more of nickel ore per year by 
froth flotation methods shall not exceed:

------------------------------------------------------------------------
                                                 Effluent limitations
                                             ---------------------------
                                                             Average of
           Effluent characteristic                          daily values
                                               Maximum for     for 30
                                                any 1 day    consecutive
                                                                days
------------------------------------------------------------------------
                                                 Milligrams per liter
                                             ---------------------------
TSS.........................................         30            20
Cd..........................................           .10           .05
Cu..........................................           .30           .15
Zn..........................................          1.0            .5
As..........................................          1.0            .5
pH..........................................      (\1\)         (\1\)
------------------------------------------------------------------------
\1\ Within the range 6.0 to 9.0.