Pretreatment standards for existing sources.

Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduced pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources. The mass of wastewater pollutants in aluminum forming process wastewater introduced into a POTW shall not exceed the values set forth below: Subpart D Core Pollutant or pollutant property PSES Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum forged Chromium 0.022 0.009 Cyanide 0.015 0.006 Zinc 0.073 0.031 TTO 0.035 Oil and grease (alternate monitoring parameter) 2.6 1.3 Subpart D Forging Scrubber Liquor Pollutant or pollutant property PSES Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum forged Chromium 0.042 0.017 Cyanide 0.028 0.011 Zinc 0.14 0.058 TTO 0.065 Oil and grease (alternate monitoring parameter) 4.9 2.5 Subpart D Solution Heat Treatment Contact Cooling Water Pollutant or pollutant property PSES Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum quenched Chromium 0.897 0.37 Cyanide 0.591 0.25 Zinc 2.98 1.24 TTO 1.41 Oil and grease (alternate monitoring parameter) 110 53 Subpart D Cleaning or Etching Bath Pollutant or pollutant property PSES Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 0.079 0.032 Cyanide 0.052 0.022 Zinc 0.26 0.11 TTO 0.123 Oil and grease (alternate monitoring parameter) 9.3 4.7 Subpart D Cleaning or Etching Rinse Pollutant or pollutant property PSES Maximum for any 1 day Maximum for monthly average mb/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 1.7 0.7 Cyanide 1.2 0.5 Zinc 5.7 2.4 TTO 2.7 Oil and grease (alternate monitoring parameter) 200 100 Subpart D Cleaning or Etching Scrubber Liquor Pollutant or pollutant property PSES Maximum for any 1 day Maximum for monthly average mg/off-kg (lb/million off-lbs) of aluminum cleaned or etched Chromium 0.851 0.35 Cyanide 0.561 0.23 Zinc 2.82 1.18 TTO 1.34 Oil and grease (alternate monitoring parameter) 100 50 [48 FR 49149, Oct. 24, 1983; 49 FR 11632, 11633, 11635, Mar. 27, 1984, as amended at 53 FR 52369, Dec. 27, 1988]