[Code of Federal Regulations] [Title 40, Volume 28] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR421.22] [Page 460] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 421_NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY--Table of Contents Subpart B_Primary Aluminum Smelting Subcategory Sec. 421.22 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available (BPT): ------------------------------------------------------------------------ Maximum for Pollutant or pollutant property Maximum for monthly any 1 day average ------------------------------------------------------------------------ Metric units--kg/kkg of product English units--lbs/ thousand lbs of product ------------------------- Fluoride...................................... 2.0 1.0 Total Suspended solids........................ 3.0 1.5 pH............................................ (\1\) (\1\) ------------------------------------------------------------------------ \1\ Within the range of 6 to 9 at all times. [49 FR 8792, Mar. 8, 1984; 49 FR 29794, July 24, 1984]