1. Regulations
  2. title 40
  3. chapter I-i31
  4. part 471
  5. subpart B
  6. § 471.22

View all text of Subpart B [§ 471.20 - § 471.26]

§ 471.22 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).

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 representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT):

(a) Rolling spent emulsions.

Subpart B—BAT

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 Chromium0.0330.014 Zinc0.1090.046 Ammonia9.954.37 Fluoride4.441.97

(b) Forging spent lubricants—subpart B—BAT. There shall be no discharge of process wastewater pollutants.

(c) Forging contact cooling water.

Subpart B—BAT

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 Chromium0.1270.052 Zinc0.4220.177 Ammonia38.517.0 Fluoride17.27.63

(d) Forging equipment cleaning wastewater.

Subpart B—BAT

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of magnesium forged Chromium0.0020.0007 Zinc0.0060.003 Ammonia0.5320.234 Fluoride0.2380.106

(e) Direct chill casting contact cooling water.

Subpart B—BAT

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 Chromium1.740.711 Zinc5.772.41 Ammonia527232 Fluoride235105

(f) Surface treatment spent baths.

Subpart B—BAT

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 Chromium0.2050.084 Zinc0.6810.285 Ammonia62.127.3 Fluoride27.812.3

(g) Surface treatment rinse.

Subpart B—BAT

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 Chromium0.8320.340 Zinc2.761.16 Ammonia252111 Fluoride11349.9

(h) Sawing or grinding spent emulsions.

Subpart B—BAT

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 Chromium0.0090.004 Zinc0.0290.012 Ammonia2.601.15 Fluoride1.160.515

(i) Degreasing spent solvents—subpart B—BAT. There shall be no discharge of process wastewater pollutants.

(j) Wet air pollution control scrubber blowdown.

Subpart B—BAT

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 Chromium0.2730.112 Zinc0.9040.378 Ammonia82.536.3 Fluoride36.916.4

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(b), (c), (e), and (g), 1316(b) and (c), and 1361; 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 471.22