[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: 40CFR440.143]

[Page 432]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 440_ORE MINING AND DRESSING POINT SOURCE CATEGORY
--Table of Contents
 
                 Subpart M_Gold Placer Mine Subcategory
 
Sec. 440.143  Effluent limitations representing the degree of effluent reduction
attainable by the application of the best available technology economically 
          achievable (BAT).

    Except as provided in 40 CFR 125.30-125.32, 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 available technology economically achievable 
(BAT).
    (a) The volume of process wastewater which may be discharged from an 
open-cut mine plant site shall not exceed the volume of infiltration, 
drainage and mine drainage waters which is in excess of the make up 
water required for operation of the beneficiation process. The 
concentration of pollutants in process wastewaters discharged from an 
open-cut mine plant site shall not exceed:

------------------------------------------------------------------------
                                                Effluent limitations--
          Effluent characteristics               Instantaneous maximum

------------------------------------------------------------------------
Settleable solids...........................               0.2 ml/l
------------------------------------------------------------------------

    (b) The volume of process wastewater which may be discharged from a 
dredge plant site shall not exceed the volume of infiltration, drainage 
and mine drainage waters which is in excess of the make up water 
required for operation of the beneficiation process. The concentration 
of pollutants in process wastewater discharged from a dredge plant site 
shall not exceed:

------------------------------------------------------------------------
                                                Effluent limitations--
          Effluent characteristics               Instantaneous maximum

------------------------------------------------------------------------
Settleable solids...........................               0.2 ml/l
------------------------------------------------------------------------