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EPA/WATER RIN: 2040-AF12 Publication ID: Spring 2010 
Title: Amendment to Effluent Guidelines for Primary Aluminum Smelting Subcategory of the Nonferrous Metals Manufacturing Point Source Category 
Abstract: EPA plans to amend 40 CFR 421 to create updated discharge standards for those primary aluminum smelters that use both wet and dry scrubbing of their air emissions. As currently written, allowances exist for individual contributions to effluent discharges from a variety of processes present at primary aluminum smelter. These allowances include one for wastewater contributions resulting from the wet scrubbing of sulfur dioxide from potline emissions (40 CFR 421.23(n)). As the Agency continues to strengthen the regulation of air pollution from aluminum smelters, it is increasingly likely that higher wastewater pollutant concentrations from these wet scrubbers will result. The State of New York has identified a facility that exhibits just this problem with the discharge of fluoride, as a result of interference by sulfur captured by the facility’s wet scrubber. The extent of this problem is such that the facility is unable to comply with its fluoride effluent limit. An amendment of the current effluent guideline is expected to resolve this tension and make it easier for the Agency and regulated entities to manage cross-media effects. 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 421   
Legal Authority: CWA 301    CWA 304    CWA 306    CWA 307    CWA 308    CWA 501   
Legal Deadline:  None
Action Date FR Cite
NPRM  06/00/2010    
Final Action  06/00/2011    
Additional Information: SAN No. 5362; EPA Docket information: EPA-HQ-OW-2010-0137.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: State 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Ahmar Siddiqui
Environmental Protection Agency
Washington, DC 20460
Phone:202 566-1044
Fax:202 566-1053

Janet Goodwin
Environmental Protection Agency
4303T, 1200 Pennsylvania Avenue NW.,
Washington, DC 20460
Phone:202 566-1060

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