Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 471Subpart D - Subpart D—Precious Metals Forming Subcategory
View all text of Subpart D [§ 471.40 - § 471.46]
§ 471.44 - Pretreatment standards for existing sources (PSES).

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and by August 23, 1985 achieve the following pretreatment standards for existing sources (PSES). The mass of wastewater pollutants in precious metals forming process wastewater introduced into a POTW shall not exceed the following values:

(a) Rolling spent neat oils—subpart D—PSES. There shall be no discharge of process wastewater pollutants.

(b) Rolling spent emulsions.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals rolled with emulsions
Cadmium0.0260.012
Copper0.1470.077
Cyanide0.0230.010
Silver0.0320.013

(c) Drawing spent neat oils—subpart D—PSES. There shall be no discharge of process wastewater pollutants.

(d) Drawing spent emulsions.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals drawn with emulsions
Cadmium0.0160.007
Copper0.0910.048
Cyanide0.0140.006
Silver0.0200.008

(e) Drawing spent soap solutions.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals drawn with soap solutions
Cadmium0.0010.0005
Copper0.0060.003
Cyanide0.00090.0004
Silver0.0020.0006

(f) Metal powder production atomization wastewater.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals powder wet atomized
Cadmium2.271.00
Copper12.76.68
Cyanide1.940.802
Silver2.741.14

(g) Heat treatment contact cooling water.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals heat treated
Cadmium0.1420.063
Copper0.7930.417
Cyanide0.1210.050
Silver0.1710.071

(h) Semi-continuous and continuous casting contact cooling water.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals cast by the semi-continuous or continuous method
Cadmium0.3500.155
Copper1.961.03
Cyanide0.2990.124
Silver0.4230.175

(i) Stationary casting contact cooling water—subpart D—PSES. There shall be no discharge of process wastewater pollutants.

(j) Direct chill casting contact cooling water.

Subpart D—PSES

Pollutant or pollutant property Maximum for any one day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals cast by the direct chill method
Cadmium0.3670.162
Copper2.051.08
Cyanide0.3130.130
Silver0.4430.184

(k) Shot casting contact cooling water.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals shot cast
Cadmium0.1250.055
Copper0.6980.367
Cyanide0.1070.044
Silver0.1510.063

(l) Wet air pollution control scrubber blowdown—subpart D—PSES. There shall be no discharge of process wastewater pollutants.

(m) Pressure bonding contact cooling water.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metal and base metal pressure bonded
Cadmium0.0290.013
Copper0.1590.084
Cyanide0.0240.010
Silver0.0340.014

(n) Surface treatment spent baths.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals surface treated
Cadmium0.0330.015
Copper0.1830.097
Cyanide0.0280.012
Silver0.0400.017

(o) Surface treatment rinse.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals surface treated
Cadmium0.2100.093
Copper1.170.616
Cyanide0.1790.074
Silver0.2530.105

(p) Alkaline cleaning spent baths.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals alkaline cleaned
Cadmium0.0210.009
Copper0.1140.060
Cyanide0.0180.007
Silver0.0250.010

(q) Alkaline cleaning rinse.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals alkaline cleaned
Cadmium0.3810.168
Copper2.131.12
Cyanide0.3250.135
Silver0.4590.191

(r) Alkaline cleaning prebonding wastewater.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals and base metal cleaned prior to bonding
Cadmium0.4000.174
Copper2.2101.16
Cyanide0.3370.139
Silver0.4760.197

(s) Tumbling or burnishing wastewater.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals tumbled or burnished
Cadmium0.4120.182
Copper2.3001.21
Cyanide0.3510.145
Silver0.4960.206

(t) Sawing or grinding spent neat oils—subpart D—PSES. There shall be no discharge of process wastewater pollutants.

(u) Sawing or grinding spent emulsions.

Subpart D—PSES

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of precious metals sawed or ground with emulsions
Cadmium0.0320.014
Copper0.1780.094
Cyanide0.0270.011
Silver0.0380.016

(v) Degreasing spent solvents—subpart D—PSNS. There shall be no discharge of process wastewater pollutants.

[50 FR 34270, Aug. 23, 1985; 51 FR 2886, Jan. 22, 1986]
authority: Secs. 301, 304(b), (c), (e), and (g), 306(b) and (c), 307, 308, and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972 as amended by the Clean Water Act of 1977) (the “Act”); 33 U.S.C. 1311,1314,c,e,and, 1316(b) andc,and; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217
source: 50 FR 34270, Aug. 23, 1985, unless otherwise noted.
cite as: 40 CFR 471.44
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