CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 471—NONFERROUS METALS FORMING AND METAL POWDERS POINT SOURCE CATEGORY > SUBPART B—Magnesium Forming Subcategory (§471.20 to §471.26) > 471.23—New source performance standards (NSPS).

471.23—New source performance standards (NSPS).

Any new source subject to this subpart must achieve the following new source performance standards. The mass of pollutants in the magnesium forming process wastewater shall not exceed the following values:
(a) Rolling spent emulsions.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off/kg (pounds per million off-pounds) of magnesium rolled with emulsions
Chromium 0.028 0.011
Zinc 0.076 0.032
Ammonia 9.95 4.37
Fluoride 4.44 1.97
Oil and grease 0.746 0.746
TSS 1.12 0.895
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(b) Forging spent lubricants—Subpart B—NSPS. There shall be no discharge of process wastewater pollutants.
(c) Forging contact cooling water.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off/kg (pounds per million off-pounds) of forged magnesium cooled with water
Chromium 0.107 0.044
Zinc 0.295 0.122
Ammonia 38.5 17.0
Fluoride 17.2 7.63
Oil and grease 2.89 2.89
TSS 4.34 3.47
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(d) Forging equipment cleaning wastewater.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off/kg (pounds per million off-pounds) of magnesium forged
Chromium 0.002 0.0006
Zinc 0.004 0.002
Ammonia 0.532 0.234
Fluoride 0.238 0.106
Oil and grease 0.040 0.040
TSS 0.060 0.048
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(e) Direct chill casting contact cooling water.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of magnesium cast with direct chill methods
Chromium 1.46 0.593
Zinc 4.03 1.66
Ammonia 527 232
Fluoride 235 105
Oil and grease 39.5 39.5
TSS 59.3 47.4
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(f) Surface treatment spent baths.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of magnesium surface treated
Chromium 0.173 0.070
Zinc 0.476 0.196
Ammonia 62.1 27.3
Fluoride 27.8 12.3
Oil and grease 4.66 4.66
TSS 6.99 5.60
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times
(g) Surface treatment rinse.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pound pers million off-pounds) of magnesium surface treated
Chromium 0.700 0.284
Zinc 1.93 0.794
Ammonia 252 111
Fluoride 113 49
Oil and grease 18.9 18.9
TSS 28.4 22.7
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times
(h) Sawing or grinding spent emulsions.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of magnesium sawed or ground
Chromium 0.007 0.003
Zinc 0.020 0.008
Ammonia 2.60 1.15
Fluoride 1.16 0.515
Oil and grease 0.195 0.195
TSS 0.293 0.234
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(i) Degreasing spent Solvents—Subpart B—NSPS. There shall be no discharge of process wastewater pollutants.
(j) Wet air pollution control scrubber blowdown.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of magnesium sanded and repaired or forged
Chromium 0.229 0.093
Zinc 0.632 0.260
Ammonia 82.5 36.3
Fluoride 36.9 16.4
Oil and grease 6.19 6.19
TSS 9.29 7.43
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

Code of Federal Regulations

[50 FR 34270, Aug. 23, 1985; 51 FR 2884, Jan. 22, 1986]
Any new source subject to this subpart must achieve the following new source performance standards. The mass of pollutants in the magnesium forming process wastewater shall not exceed the following values:
(a) Rolling spent emulsions.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off/kg (pounds per million off-pounds) of magnesium rolled with emulsions
Chromium 0.028 0.011
Zinc 0.076 0.032
Ammonia 9.95 4.37
Fluoride 4.44 1.97
Oil and grease 0.746 0.746
TSS 1.12 0.895
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(b) Forging spent lubricants—subpart B—NSPS. There shall be no discharge of process wastewater pollutants.
(c) Forging contact cooling water.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off/kg (pounds per million off-pounds) of forged magnesium cooled with water
Chromium 0.107 0.044
Zinc 0.295 0.122
Ammonia 38.5 17.0
Fluoride 17.2 7.63
Oil and grease 2.89 2.89
TSS 4.34 3.47
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(d) Forging equipment cleaning wastewater.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off/kg (pounds per million off-pounds) of magnesium forged
Chromium 0.002 0.0006
Zinc 0.004 0.002
Ammonia 0.532 0.234
Fluoride 0.238 0.106
Oil and grease 0.040 0.040
TSS 0.060 0.048
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(e) Direct chill casting contact cooling water.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of magnesium cast with direct chill methods
Chromium 1.46 0.593
Zinc 4.03 1.66
Ammonia 527 232
Fluoride 235 105
Oil and grease 39.5 39.5
TSS 59.3 47.4
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(f) Surface treatment spent baths.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of magnesium surface treated
Chromium 0.173 0.070
Zinc 0.476 0.196
Ammonia 62.1 27.3
Fluoride 27.8 12.3
Oil and grease 4.66 4.66
TSS 6.99 5.60
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times
(g) Surface treatment rinse.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pound pers million off-pounds) of magnesium surface treated
Chromium 0.700 0.284
Zinc 1.93 0.794
Ammonia 252 111
Fluoride 113 49
Oil and grease 18.9 18.9
TSS 28.4 22.7
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times
(h) Sawing or grinding spent emulsions.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of magnesium sawed or ground
Chromium 0.007 0.003
Zinc 0.020 0.008
Ammonia 2.60 1.15
Fluoride 1.16 0.515
Oil and grease 0.195 0.195
TSS 0.293 0.234
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.
(i) Degreasing spent Solvents—subpart B—NSPS. There shall be no discharge of process wastewater pollutants.
(j) Wet air pollution control scrubber blowdown.
Subpart B—NSPS
Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average
mg/off-kg (pounds per million off-pounds) of magnesium sanded and repaired or forged
Chromium 0.229 0.093
Zinc 0.632 0.260
Ammonia 82.5 36.3
Fluoride 36.9 16.4
Oil and grease 6.19 6.19
TSS 9.29 7.43
pH (1) (1)
1 Within the range of 7.5 to 10.0 at all times.

Code of Federal Regulations

[50 FR 34270, Aug. 23, 1985; 51 FR 2884, Jan. 22, 1986]