[Code of Federal Regulations] [Title 40, Volume 27] [Revised as ofJuly 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR471.41] [Page 725-728] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 471--NONFERROUS METALS FORMING AND METAL POWDERS POINT SOURCE CATEGORY--Table of Contents Subpart D--Precious Metals Forming Subcategory Sec. 471.41 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 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations for the process operations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT): (a) Rolling spent neat oils--Subpart D--BPT. There shall be no discharge of process wastewater pollutants. (b) Rolling spent emulsions. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals rolled with emulsions --------------- Chromium.................................... 0.026 0.012 Copper...................................... 0.147 0.077 Cyanide..................................... 0.023 0.010 Silver...................................... 0.032 0.013 Oil and grease.............................. 1.54 0.925 TSS......................................... 3.16 1.51 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (c) Drawing spent neat oils--Subpart D--BPT. There shall be no discharge of process wastewater pollutants. (d) Drawing spent emulsions. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals drawn with emulsions --------------- Cadmium..................................... 0.016 0.007 Copper...................................... 0.091 0.048 Cyanide..................................... 0.014 0.006 Silver...................................... 0.020 0.008 Oil and grease.............................. 0.950 0.570 TSS......................................... 1.95 0.926 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (e) Drawing spent soap solutions. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals drawn with soap solutions --------------- Cadmium..................................... 0.001 0.0005 Copper...................................... 0.006 0.003 Cyanide..................................... 0.0009 0.0004 Silver...................................... 0.001 0.0006 Oil and grease.............................. 0.063 0.038 TSS......................................... 0.128 0.061 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (f) Metal powder production wet atomization wastewater. [[Page 726]] Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals powder wet atomized --------------- Cadmium..................................... 2.27 1.00 Copper...................................... 12.7 6.70 Cyanide..................................... 1.94 0.802 Silver...................................... 2.70 1.14 Oil and grease.............................. 134 80.2 TSS......................................... 274 130 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (g) Heat treatment contact cooling water. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of extruded precious metals heat treated --------------- Cadmium..................................... 1.42 0.626 Copper...................................... 7.93 4.17 Cyanide..................................... 1.21 0.501 Silver...................................... 1.71 0.709 Oil and grease.............................. 83.4 50.1 TSS......................................... 171 81.3 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (h) Semi-continuous or continuous casting contact cooling water. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals cast by the semi-continuous or continuous method --------------- Cadmium..................................... 3.50 1.55 Copper...................................... 19.6 10.3 Cyanide..................................... 2.99 1.24 Silver...................................... 4.23 1.75 Oil and grease.............................. 206 124 TSS......................................... 423 209 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (i) Stationary casting contact cooling water--Subpart D--BPT. There shall be no discharge of process wastewater pollutants. (j) Direct chill casting contact cooling water. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals cast by the direct chill method --------------- Cadmium..................................... 3.67 1.62 Copper...................................... 20.5 10.8 Cyanide..................................... 3.13 1.30 Silver...................................... 4.43 1.84 Oil and grease.............................. 216 130 TSS......................................... 443 211 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (k) Shot casting contact cooling water. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals shot cast --------------- Cadmium..................................... 1.25 0.551 Copper...................................... 6.98 3.67 Cyanide..................................... 1.07 0.441 Silver...................................... 1.51 0.624 Oil and grease.............................. 73.4 44.1 TSS......................................... 151 71.6 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (l) Wet air pollution control scrubber blowdown--Subpart D--BPT. There shall be no discharge of process wastewater pollutants. (m) Pressure bonding contact cooling water. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals and base metal pressure bonded --------------- Cadmium..................................... 0.029 0.013 Copper...................................... 0.159 0.084 Cyanide..................................... 0.024 0.010 Silver...................................... 0.034 0.014 Oil and grease.............................. 1.67 1.00 TSS......................................... 3.43 1.63 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (n) Surface treatment spent baths. [[Page 727]] Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals surface treated --------------- Cadmium..................................... 0.033 0.015 Copper...................................... 0.183 0.097 Cyanide..................................... 0.028 0.012 Silver...................................... 0.040 0.017 Oil and grease.............................. 1.93 1.16 TSS......................................... 3.95 1.88 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (o) Surface treatment rinse. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals surface treated --------------- Cadmium..................................... 2.10 0.924 Copper...................................... 11.7 5.16 Cyanide..................................... 1.79 0.739 Silver...................................... 2.53 1.05 Oil and grease.............................. 123 73.9 TSS......................................... 253 120 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (p) Alkaline cleaning spent baths. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals alkaline cleaned --------------- Cadmium...................................... 0.021 0.009 Copper....................................... 0.114 0.060 Cyanide...................................... 0.018 0.007 Silver....................................... 0.025 0.010 Oil and grease............................... 1.20 0.720 TSS.......................................... 2.46 1.170 pH........................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (q) Alkaline cleaning rinse. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals alkaline cleaned --------------- Cadmium..................................... 3.81 1.68 Copper...................................... 21.3 11.2 Cyanide..................................... 3.25 1.35 Silver...................................... 4.59 1.91 Oil and grease.............................. 224 135 TSS......................................... 459 219 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (r) Alkaline cleaning prebonding wastewater. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals and base metal cleaned prior to bonding --------------- Cadmium..................................... 3.95 1.74 Copper...................................... 22.1 11.6 Cyanide..................................... 3.37 1.39 Silver...................................... 4.76 1.97 Oil and grease.............................. 232 139 TSS......................................... 476 226 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (s) Tumbling or burnishing wastewater. Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals tumbled or burnished --------------- Cadmium..................................... 4.12 1.82 Copper...................................... 23.0 12.1 Cyanide..................................... 3.51 1.45 Silver...................................... 4.96 2.06 Oil and grease.............................. 242 145 TSS......................................... 496 236 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (t) Sawing or grinding spent neat oils--Subpart D--BPT. There shall be no discharge of process wastewater pollutants. (u) Sawing or grinding spent emulsions. [[Page 728]] Subpart D--BPT ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ mg/off-kg (pounds per million off-pounds) of precious metals sawed or ground with emulsions --------------- Cadmium..................................... 0.032 0.014 Copper...................................... 0.178 0.094 Cyanide..................................... 0.027 0.011 Silver...................................... 0.039 0.016 Oil and grease.............................. 1.87 1.12 TSS......................................... 3.83 1.82 pH.......................................... (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 7.5 to 10.0 at all times. (v) Degreasing spent solvents--Subpart D--BPT. There shall be no discharge of process wastewater pollutants. [50 FR 34270, Aug. 23, 1985; 51 FR 2886, Jan. 22, 1986]