[Code of Federal Regulations] [Title 40, Volume 27] [Revised as ofJuly 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR437.11] [Page 369] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 437--THE CENTRALIZED WASTE TREATMENT POINT SOURCE CATEGORY--Table of Contents Subpart A--Metals Treatment and Recovery Sec. 437.11 Effluent limitations attainable by the application of the best practicable control technology currently available (BPT). (a) Except as provided in 40 CFR 125.30 through 125.32 or 437.10(b), any existing point source subject to this subpart must achieve the following effluent limitations representing the application of BPT: BPT Limitations ------------------------------------------------------------------------ Maximum Regulated parameter Maximum monthly daily \1\ avg.\1\ ------------------------------------------------------------------------ Conventional Parameters ------------------------------------------------------------------------ O&G......................................... 205 50.2 pH.......................................... (\2\) (\2\) TSS......................................... 60.0 31.0 --------------------------------------------- Metal Parameters ------------------------------------------------------------------------ Antimony.................................... 0.249 0.206 Arsenic..................................... 0.162 0.104 Cadmium..................................... 0.474 0.0962 Chromium.................................... 15.5 3.07 Cobalt...................................... 0.192 0.124 Copper...................................... 4.14 1.06 Lead........................................ 1.32 0.283 Mercury..................................... 0.00234 0.000739 Nickel...................................... 3.95 1.45 Selenium.................................... 1.64 0.408 Silver...................................... 0.120 0.0351 Tin......................................... 0.409 0.120 Titanium.................................... 0.0947 0.0618 Vanadium.................................... 0.218 0.0662 Zinc........................................ 2.87 0.641 ------------------------------------------------------------------------ \1\ mg/L (ppm). \2\ Within the range 6 to 9. (b) The following in-plant limitations apply to metal-bearing wastewater containing cyanide: In-Plant Limitations ------------------------------------------------------------------------ Maximum Regulated parameter Maximum monthly daily \1\ avg.\1\ ------------------------------------------------------------------------ Cyanide....................................... 500 178 ------------------------------------------------------------------------ \1\ mg/L (ppm).