Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 471Subpart E - Subpart E—Refractory Metals Forming Subcategory
View all text of Subpart E [§ 471.50 - § 471.56]
§ 471.51 - 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 and graphite based lubricants—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(b) Rolling spent emulsions.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals rolled with emulsions
Copper0.8150.429
Nickel0.8240.545
Fluoride25.511.3
Molybdenum2.841.47
Oil and grease8.585.15
TSS17.68.37
pH( 1)( 1)

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

(c) Drawing spent lubricants—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(d) Extrusion spent lubricants—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(e) Extrusion press hydraulic fluid leakage.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals extruded
Copper2.261.19
Nickel2.291.51
Fluoride70.831.4
Molybdenum7.874.07
Oil and grease23.814.3
TSS48.823.2
pH( 1)( 1)

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

(f) Forging spent lubricants—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(g) Forging contact cooling water.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of forged refractory metals cooled with water
Copper0.6140.323
Nickel0.6200.410
Fluoride19.28.53
Molybdenum2.141.11
Oil and grease6.463.88
TSS13.36.30
pH( 1)( 1)

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

(h) Equipment cleaning wastewater.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals formed
Copper2.591.36
Nickel2.611.73
Fluoride80.935.9
Molybdenum8.994.65
Oil and grease27.216.3
TSS55.826.5
pH( 1)( 1)

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

(i) Metal powder production wastewater.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals powder produced
Copper0.5340.281
Nickel0.5400.357
Fluoride16.707.42
Molybdenum1.860.961
Oil and grease5.623.37
TSS11.55.48
pH( 1)( 1)

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

(j) Metal powder production floor wash wastewater—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(k) Metal powder pressing spent lubricants—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(l) Surface treatment spent baths.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals surface treated
Copper0.7390.389
Nickel0.7470.494
Fluoride23.210.3
Molybdenum2.571.33
Oil and grease7.784.68
TSS16.07.59
pH( 1)( 1)

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

(m) Surface treatment rinse.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals surface treated
Copper230121
Nickel232154
Fluoride7,2003,200
Molybdenum800414
Oil and grease2,4201,450
TSS4,9602,360
pH( 1)( 1)

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

(n) Alkaline cleaning spent baths.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals alkaline cleaned
Copper0.6350.334
Nickel0.6410.424
Fluoride19.98.82
Molybdenum2.211.14
Oil and grease6.684.01
TSS13.76.51
pH( 1)( 1)

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

(o) Alkaline cleaning rinse.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals alkaline cleaned
Copper1,550816
Nickel1,5701,040
Fluoride48,60021,600
Molybdenum5,4002,790
Oil and grease16,3009,790
TSS33,50015,900
pH( 1)( 1)

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

(p) Molten salt rinse.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals treated with molten salt
Copper12.16.33
Nickel12.28.04
Fluoride377167
Molybdenum41.921.7
Oil and grease12776.0
TSS260124
pH( 1)( 1)

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

(q) Tumbling or burnishing wastewater.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals tumbled or burnished
Copper23.812.5
Nickel24.015.9
Fluoride744330
Molybdenum82.742.8
Oil and grease250150
TSS513244
pH( 1)( 1)

Within the range of 7.5 to 10.0 at all times.

(r) Sawing or grinding spent neat oils—subpart E—BPT. There shall be no discharge of process wastewater pollutants.

(s) Sawing or grinding spent emulsions.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals sawed or ground with emulsions
Copper0.5650.297
Nickel0.5700.377
Fluoride17.77.84
Molybdenum1.971.02
Oil and grease5.943.57
TSS12.25.79
pH( 1)( 1)

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

(t) Sawing or grinding contact cooling water.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals sawed or ground with contact cooling water
Copper46.224.3
Nickel46.730.9
Fluoride1450642
Molybdenum16183.1
Oil and grease486292
TSS997474
pH( 1)( 1)

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

(u) Sawing or grinding rinse.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of sawed or ground refractory metals rinsed
Copper0.2570.135
Nickel0.2590.172
Fluoride8.033.57
Molybdenum0.8930.462
Oil and grease2.701.62
TSS5.542.63
pH( 1)( 1)

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

(v) Wet air pollution control scrubber blowdown.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals sawed or ground, surface coated or surface treated
Copper1.500.787
Nickel1.511.00
Fluoride46.820.8
Molybdenum5.202.69
Oil and grease15.89.45
TSS32.315.4
pH( 1)( 1)

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

(w) Miscellaneous wastewater sources.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals formed
Copper0.6560.345
Nickel0.6630.438
Fluoride20.69.11
Molybdenum2.281.18
Oil and grease6.94.14
TSS14.26.73
pH( 1)( 1)

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

(x) Dye penetrant testing wastewater.

Subpart E—BPT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of refractory metals tested
Copper0.1500.078
Nickel0.1500.099
Fluoride4.602.00
Molybdenum0.5130.266
Oil and grease1.600.930
TSS3.201.50
pH( 1)( 1)

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

(y) Degreasing spent solvents—subpart E—BPT. 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 471.51
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