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 Code of Federal Regulations (Last Updated: November 8, 2024)
 Title 40 - Protection of Environment
 Chapter I - Environmental Protection Agency
 SubChapter C - Air Programs
 Part 63 - National Emission Standards for Hazardous Air Pollutants for Source Categories
 Subpart DDD - National Emission Standards for Hazardous Air Pollutants for Mineral Wool Production

  Table 2 to Subpart DDD of Part 63 - Emissions Limits and Compliance Dates  

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  • Table 2 to Subpart DDD of Part 63 - Emissions Limits and Compliance Dates

    If your source is a: And you commenced construction: Your emission limits are:1 And you must comply by:2
    1. Cupola On or before May 8, 1997 0.10 lb PM per ton of melt June 2, 2002.
    2. Cupola After May 8, 1997 0.10 lb PM per ton of melt June 1, 1999.
    3. Cupola On or before May 8, 1997 a. 0.10 lb carbon monoxide (CO) per ton of melt,3 or
    b. Reduction of uncontrolled CO by at least 99 percent3     		June 2, 2002.
    4. Cupola After May 8, 1997 but on or before November 25, 2011 a. 0.10 lb CO per ton of melt,3 or
    b. Reduction of uncontrolled CO by at least 99 percent.3     		June 1, 1999.
    5. Closed-top cupola On or before November 25, 2011 3.4 lb of carbonyl sulfide (COS) per ton melt July 30, 2018.
    6. Closed-top cupola After November 25, 2011 0.062 lb of COS per ton melt July 29, 2015.4
    7. Open-top cupola On or before November 25, 2011 6.8 lb of COS per ton melt July 30, 2018.
    8. Open-top cupola After November 25, 2011 3.2 lb of COS per ton melt July 29, 2015.4
    9. Cupola using slag as a raw material On or before November 25, 2011 0.16 lb of hydrogen fluoride (HF) per ton melt
    0.44 lb of hydrogen chloride (HCl) per ton melt.    		 July 30, 2018.
    10. Cupola using slag as a raw material After November 25, 2011 0.015 lb of HF per ton melt
    0.012 lb of HCl per ton melt.    		 July 29, 2015.4
    11. Cupola not using slag as a raw material On or before November 25, 2011 0.13 lb of HF per ton melt
    0.43 lb of HCl per ton melt.    		 July 30, 2018.
    12. Cupola not using slag as a raw material After November 25, 2011 0.018 lb of HF per ton melt
    0.015 lb of HCl per ton melt.    		 July 29, 2015.4
    17. Curing oven On or before May 8, 1997 a. 0.06 lb of formaldehyde per ton of melt,3 or
    b. Reduction of uncontrolled formaldehyde by at least 80 percent.3     		June 2, 2002.
    18. Curing oven After May 8, 1997 but before November 25, 2011 a. 0.06 lb of formaldehyde per ton of melt,3 or
    b. Reduction of uncontrolled formaldehyde by at least 80 percent.3     		June 1, 1999.
    19. Combined drum collection/curing operation On or before November 25, 2011 0.17 lb of formaldehyde per ton of melt
    0.28 lb of methanol per ton melt.
    0.85 lb of phenol per ton melt.    		 July 30, 2018.
    20. Combined drum collection/curing operation After November 25, 2011 0.17 lb of formaldehyde per ton of melt
    0.28 lb of methanol per ton melt.
    0.85 lb of phenol per ton melt.    		 July 29, 2015.4
    21. Combined horizontal collection/curing operation On or before November 25, 2011 0.63 lb of formaldehyde per ton of melt
    0.049 lb of methanol per ton melt.
    0.12 lb of phenol per ton melt.    		 July 30, 2018.
    22. Combined horizontal collection/curing operation After November 25, 2011 0.63 lb of formaldehyde per ton of melt
    0.049 lb of methanol per ton melt.
    0.12 lb of phenol per ton melt.    		 July 29, 2015.4
    23. Combined vertical collection/curing operation On or before November 25, 2011 2.4 lb of formaldehyde per ton melt
    0.92 lb of methanol per ton melt.
    0.71 lb of phenol per ton melt.    		 July 30, 2018.
    24. Combined vertical collection/curing operation After November 25, 2011 2.4 lb of formaldehyde per ton melt
    0.92 lb of methanol per ton melt.
    0.71 lb of phenol per ton melt.    		 July 29, 2015.4

    1 The numeric emissions limits do not apply during startup and shutdown.

    2 Existing sources must demonstrate compliance by the compliance dates specified in this table. New sources have 180 days after the applicable compliance date to demonstrate compliance.

    3 This emissions limit does not apply after July 30, 2018.

    4 Or upon initial startup, whichever is later.

    [80 FR 45333, July 29, 2015]