[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: 40CFR440.142] [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. 440.142 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 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 practicable control technology currently available (BPT): (a) The concentration of pollutants discharged in process wastewater from an open-cut mine plant site shall not exceed: ------------------------------------------------------------------------ Effluent limitations ------------------------------------------------------------------------- Instantaneous Effluent characteristics maximum ------------------------------------------------------------------------ Settleable solids...................................... 0.2 ml/l ------------------------------------------------------------------------ (b) The concentration of pollutants discharged in process wastewater from a dredge plant site shall not exceed: ------------------------------------------------------------------------ Effluent limitations-- Effluent characteristics Instantaneous maximum ------------------------------------------------------------------------ Settleable solids........................... 0.2 ml/l ------------------------------------------------------------------------