[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: 40CFR422.42]

[Page 646-647]
 
                TITLE 40-PROTECTION OF ENVIRONMENT
 
      CHAPTER I-ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 422-PHOSPHATE MANUFACTURING POINT SOURCE CATEGORY--Table of Contents
 
        Subpart D-Defluorinated Phosphate Rock Subcategory
 
Sec. 422.42  Effluent limitations and guidelines representing the degree of effluent reduction attainable by the application of the best practicable control 
          technology currently available.

    (a) Subject to the provisions of paragraphs (b), (c) and (d) of this 
section, the following limitations establish the quantity or quality of 
pollutants or pollutant properties, controlled by this section, which 
may be discharged by a point source subject to the provisions of this 
subpart after application of the best practicable control technology 
currently available: There shall be no discharge of process waste water 
pollutants to navigable waters.
    (b) Process waste water pollutants from a cooling water 
recirculation system designed, constructed and operated to maintain a 
surge capacity equal to the runoff from the 10-year, 24-hour rainfall 
event may be discharged, after treatment to the standards set forth in 
paragraph (c) of this section, whenever chronic or catastrophic 
precipitation events cause the water level in the pond to rise into the 
surge capacity. Process waste water must be treated and discharged 
whenever the water level equals or exceeds the mid point of the surge 
capacity.
    (c) The concentration of pollutants discharged in process waste 
water pursuant to the limitations of paragraph (b) of this section shall 
not exceed the values listed in the following table:

                         [Milligrams per liter]
------------------------------------------------------------------------
                                             Effluent limitations
                                     -----------------------------------
                                                     Average of daily
       Effluent characteristic          Maximum        values for 30
                                       for any 1  consecutive days shall
                                          day       not exceed-
                                                         
------------------------------------------------------------------------
Total phosphorus (as P).............         105                   35
Fluoride (as F).....................          75                   25
TSS.................................         150                   50
pH..................................       (\1\)                (\1\)
------------------------------------------------------------------------
\1\ Within the range 6.0 to 9.5.


The total suspended solid limitation set forth in this paragraph shall 
be waived for process wastewater from a

[[Page 647]]

calcium sulfate storage pile runoff facility, operated separately or in 
combination with a water recirculation system, which is chemically 
treated and then clarified or settled to meet the other pollutant 
limitations set forth in this paragraph.
    (d) The concentration of pollutants discharged in contaminated 
nonprocess wastewater shall not exceed the values listed in the 
following table:

                         [Milligrams per liter]
------------------------------------------------------------------------
                                             Effluent limitations
                                     -----------------------------------
                                                     Average of daily
       Effluent characteristic          Maximum        values for 30
                                       for any 1  consecutive days shall
                                          day       not exceed-
                                                         
------------------------------------------------------------------------
Total phosphorus (as P).............         105                   35
Fluoride (as F).....................          75                   25
pH..................................       (\1\)                (\1\)
------------------------------------------------------------------------
\1\ Within the range 6.0 to 9.5.