[Code of Federal Regulations] [Title 40, Volume 27] [Revised as ofJuly 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR471.25] [Page 703-704] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 471--NONFERROUS METALS FORMING AND METAL POWDERS POINT SOURCE CATEGORY--Table of Contents Subpart B--Magnesium Forming Subcategory Sec. 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 ------------------------------------------------------------------------ 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 ------------------------------------------------------------------------ (b) Forging spent lubricants--Subpart B--PSNS. There shall be no discharge of process wastewater pollutants. (c) Forging contact cooling water. Subpart B--PSNS ------------------------------------------------------------------------ Maximum for any 1 Maximum for Pollutant or pollutant property day 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 ------------------------------------------------------------------------ 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 ------------------------------------------------------------------------ (e) Direct chill casting contact cooling water. Subpart B--PSNS ------------------------------------------------------------------------ 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 ------------------------------------------------------------------------ (f) Surface treatment spent baths. Subpart B--PSNS ------------------------------------------------------------------------ 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 ------------------------------------------------------------------------ (g) Surface treatment rinse. Subpart B--PSNS ------------------------------------------------------------------------ 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.................................... 0.700 0.284 Zinc........................................ 1.93 0.794 Ammonia..................................... 252 111 Fluoride.................................... 113 49.9 ------------------------------------------------------------------------ (h) Sawing or grinding spent emulsions. [[Page 704]] Subpart B--PSNS ------------------------------------------------------------------------ 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 ------------------------------------------------------------------------ (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 ------------------------------------------------------------------------ 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 ------------------------------------------------------------------------ [50 FR 34270, Aug. 23, 1985; 51 FR 2884, Jan. 22, 1986]