TITLE 40 - PROTECTION OF ENVIRONMENT

CHAPTER I - ENVIRONMENTAL PROTECTION AGENCY

SUBCHAPTER N - EFFLUENT GUIDELINES AND STANDARDS

PART 471 - NONFERROUS METALS FORMING AND METAL POWDERS POINT SOURCE CATEGORY

subpart b - MAGNESIUM FORMING SUBCATEGORY

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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 lubricantsSubpart BNSPS. There shall be no discharge of process wastewater pollutants.

  (c) Forging contact cooling water.

Subpart B_NSPS ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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 SolventsSubpart BNSPS. There shall be no discharge of process wastewater pollutants.

  (j) Wet air pollution control scrubber blowdown.

Subpart B_NSPS ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day 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.

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