1. Regulations
  2. title 40
  3. chapter I-i31
  4. part 471
  5. subpart B
  6. § 471.25

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

§ 471.25 - Pretreatment standards for new sources (PSNS).

Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources (PSNS). The mass of wastewater pollutants in magnesium forming process wastewater introduced into a POTW shall not exceed the following values:

(a) Rolling spent emulsions.

Subpart B—PSNS

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 Chromium0.0280.011 Zinc0.0760.032 Ammonia9.954.37 Fluoride4.441.97

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

(c) Forging contact cooling water.

Subpart B—PSNS

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 Chromium0.1070.044 Zinc0.2950.122 Ammonia38.517.0 Fluoride17.27.63

(d) Forging equipment cleaning wastewater.

Subpart B—PSNS

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average mg/off-kg (pounds per million off-pounds) of magnesium forged Chromium0.0020.0006 Zinc0.0040.002 Ammonia0.5320.234 Fluoride0.2380.106

(e) Direct chill casting contact cooling water.

Subpart B—PSNS

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 Chromium1.460.593 Zinc4.031.66 Ammonia527232 Fluoride235105

(f) Surface treatment spent baths.

Subpart B—PSNS

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 Chromium0.1730.070 Zinc0.4760.196 Ammonia62.127.3 Fluoride27.812.3

(g) Surface treatment rinse.

Subpart B—PSNS

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 Chromium0.7000.284 Zinc1.930.794 Ammonia252111 Fluoride11349.9

(h) Sawing or grinding spent emulsions.

Subpart B—PSNS

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 Chromium0.0070.003 Zinc0.0200.008 Ammonia2.601.15 Fluoride1.160.515

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

(j) Wet air pollution control scrubber blowdown.

Subpart B—PSNS

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 Chromium0.2290.093 Zinc0.6320.260 Ammonia82.536.3 Fluoride36.916.4
[50 FR 34270, Aug. 23, 1985; 51 FR 2884, 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(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 471.25