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]
§ 471.43 - New source performance standards (NSPS).

Any new source subject to this subpart must achieve the following new source performance standards (NSPS):

(a) Rolling Spent Neat Oils—subpart D—NSPS. There shall be no discharge of process wastewater pollutants.

(b) Rolling spent emulsions.

Subpart D—NSPS

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
Oil and grease1.540.925
TSS3.161.51
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

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

(d) Drawing spent emulsions.

Subpart D—NSPS

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
Cadmium0.0170.007
Copper0.0910.048
Cyanide0.0140.006
Silver0.0200.008
Oil and grease0.9500.570
TSS1.950.927
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(e) Drawing spent soap solutions.

Subpart D—NSPS

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
Oil and grease0.0630.038
TSS0.1280.061
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(f) Metal powder production atomization wastewater.

Subpart D—NSPS

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
Oil and grease13480.2
TSS274131
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(g) Heat treatment contact cooling water.

Subpart D—NSPS

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
Oil and grease8.345.01
TSS17.18.13
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

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

Subpart D—NSPS

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
Oil and grease20.612.4
TSS42.320.1
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

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

(j) Direct chill casting contact cooling water.

Subpart D—NSPS

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 direct chill method
Cadmium0.3670.162
Copper2.051.08
Cyanide0.3130.130
Silver0.4430.184
Oil and grease21.613.0
TSS44.321.1
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(k) Shot casting contact cooling water.

Subpart D—NSPS

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
Oil and grease7.344.41
TSS15.17.16
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—NSPS. There shall be no discharge of process wastewater pollutants.

(m) Pressure bonding contact cooling water.

Subpart D—NSPS

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 pressure bonded
Cadmium0.0290.013
Copper0.1590.084
Cyanide0.0240.010
Silver0.0340.014
Oil and grease1.671.00
TSS3.431.63
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(n) Surface treatment spent baths.

Subpart D—NSPS

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
Oil and grease1.931.16
TSS3.951.88
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(o) Surface treatment rinse.

Subpart D—NSPS

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
Oil and grease12.37.39
TSS25.312.0
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(p) Alkaline cleaning spent baths.

Subpart D—NSPS

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
Oil and grease1.200.720
TSS2.461.17
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(q) Alkaline cleaning rinse.

Subpart D—NSPS

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
Copper2.131.112
Cyanide0.3250.135
Silver0.4590.191
Oil and grease22.413.5
TSS45.921.9
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(r) Alkaline cleaning pre-bonding wastewater.

Subpart D—NSPS

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
Copper2.211.16
Cyanide0.3370.139
Silver0.4760.197
Oil and grease23.213.9
TSS47.622.6
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(s) Tumbling or burnishing wastewater.

Subpart D—NSPS

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
Copper2.301.21
Cyanide0.3510.145
Silver0.4960.206
Oil and grease24.214.5
TSS49.623.6
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—NSPS. There shall be no discharge of process wastewater pollutants.

(u) Sawing or grinding spent emulsions.

Subpart D—NSPS

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
Oil and grease1.871.12
TSS3.831.82
pH( 1)( 1)

1 Within the range of 7.5 to 10.0 at all times.

(v) Degreasing spent solvents—subpart D—NSPS. 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 471.43
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