Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and by August 23, 1988 achieve the following pretreatment standards for existing sources (PSES). 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—PSES

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 0.033 0.014
Zinc 0.109 0.046
Ammonia 9.95 4.37
Fluoride 4.44 1.97

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

(c) Forging contact cooling water.

Subpart B—PSES

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 cooled with water
Chromium 0.127 0.052
Zinc 0.422 0.177
Ammonia 38.5 17.0
Fluoride 17.2 7.63

(d) Forging equipment cleaning wastewater.

Subpart B—PSES

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 0.0007
Zinc 0.006 0.003
Ammonia 0.532 0.234
Fluoride 0.238 0.106

(e) Direct chill casting contact cooling water.

Subpart B—PSES

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
Chromiun 1.74 0.711
Zinc 5.77 2.41
Ammonia 527 232
Fluoride 235 105

(f) Surface treatment spent baths.

Subpart B—PSES

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
Chromiun 0.205 0.084
Zinc 0.681 0.285
Ammonia 62.1 27.3
Fluoride 27.8 12.3

(g) Surface treatment rinse.

Subpart B—PSES

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
Chromiun 0.832 0.340
Zinc 2.76 1.16
Ammonia 252 111
Fluoride 113 49.9

(h) Sawing or grinding spent emulsions.

Subpart B—PSES

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
Chromiun 0.009 0.004
Zinc 0.029 0.012
Ammonia 2.60 1.15
Fluoride 1.16 0.515

(i) Degreasing Spent Solvents—subpart B—PSES. There shall be no discharge of process wastewater pollutants.

(j) Wet air pollution control scrubber blowdown.

Subpart B—PSES

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 0.273 0.112
Zinc 0.904 0.378
Ammonia 8.25 36.3
Fluoride 36.9 16.4

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


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