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

Open Table
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

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

(c) Forging contact cooling water.

Subpart B—PSNS

Open Table
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

(d) Forging equipment cleaning wastewater.

Subpart B—PSNS

Open Table
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

(e) Direct chill casting contact cooling water.

Subpart B—PSNS

Open Table
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

(f) Surface treatment spent baths.

Subpart B—PSNS

Open Table
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

(g) Surface treatment rinse.

Subpart B—PSNS

Open Table
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 0.700 0.284
Zinc 1.93 0.794
Ammonia 252 111
Fluoride 113 49.9

(h) Sawing or grinding spent emulsions.

Subpart B—PSNS

Open Table
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

(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

Open Table
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

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


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