40 CFR 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

Copper 0.815 0.429

Nickel 0.824 0.545

Fluoride 25.5 11.3

Molybdenum 2.84 1.47

Oil and grease 8.58 5.15

TSS 17.6 8.37

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

Copper 2.26 1.19

Nickel 2.29 1.51

Fluoride 70.8 31.4

Molybdenum 7.87 4.07

Oil and grease 23.8 14.3

TSS 48.8 23.2

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

Copper 0.614 0.323

Nickel 0.620 0.410

Fluoride 19.2 8.53

Molybdenum 2.14 1.11

Oil and grease 6.46 3.88

TSS 13.3 6.30

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

Copper 2.59 1.36

Nickel 2.61 1.73

Fluoride 80.9 35.9

Molybdenum 8.99 4.65

Oil and grease 27.2 16.3

TSS 55.8 26.5

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

Copper 0.534 0.281

Nickel 0.540 0.357

Fluoride 16.70 7.42

Molybdenum 1.86 0.961

Oil and grease 5.62 3.37

TSS 11.5 5.48

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

Copper 0.739 0.389

Nickel 0.747 0.494

Fluoride 23.2 10.3

Molybdenum 2.57 1.33

Oil and grease 7.78 4.68

TSS 16.0 7.59

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

Copper 230 121

Nickel 232 154

Fluoride 7,200 3,200

Molybdenum 800 414

Oil and grease 2,420 1,450

TSS 4,960 2,360

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

Copper 0.635 0.334

Nickel 0.641 0.424

Fluoride 19.9 8.82

Molybdenum 2.21 1.14

Oil and grease 6.68 4.01

TSS 13.7 6.51

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

Copper 1,550 816

Nickel 1,570 1,040

Fluoride 48,600 21,600

Molybdenum 5,400 2,790

Oil and grease 16,300 9,790

TSS 33,500 15,900

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

Copper 12.1 6.33

Nickel 12.2 8.04

Fluoride 377 167

Molybdenum 41.9 21.7

Oil and grease 127 76.0

TSS 260 124

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

Copper 23.8 12.5

Nickel 24.0 15.9

Fluoride 744 330

Molybdenum 82.7 42.8

Oil and grease 250 150

TSS 513 244

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

Copper 0.565 0.297

Nickel 0.570 0.377

Fluoride 17.7 7.84

Molybdenum 1.97 1.02

Oil and grease 5.94 3.57

TSS 12.2 5.79

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

Copper 46.2 24.3

Nickel 46.7 30.9

Fluoride 1450 642

Molybdenum 161 83.1

Oil and grease 486 292

TSS 997 474

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

Copper 0.257 0.135

Nickel 0.259 0.172

Fluoride 8.03 3.57

Molybdenum 0.893 0.462

Oil and grease 2.70 1.62

TSS 5.54 2.63

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

Copper 1.50 0.787

Nickel 1.51 1.00

Fluoride 46.8 20.8

Molybdenum 5.20 2.69

Oil and grease 15.8 9.45

TSS 32.3 15.4

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

Copper 0.656 0.345

Nickel 0.663 0.438

Fluoride 20.6 9.11

Molybdenum 2.28 1.18

Oil and grease 6.9 4.14

TSS 14.2 6.73

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

Copper 0.150 0.078

Nickel 0.150 0.099

Fluoride 4.60 2.00

Molybdenum 0.513 0.266

Oil and grease 1.60 0.930

TSS 3.20 1.50

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.