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Table 2 to Subpart DDDDD of Part 63—Emission Limits for Existing Boilers and Process Heaters d

RegSenseCFR RegulationsEnvironmental Protection Agency (EPA)Hazardous Air PollutantsEnvironmentalAir QualityFocus AreaUSAEnglishAir ProgramsCFR Appendix

Table 2 to Subpart DDDDD of Part 63—Emission Limits for Existing Boilers and Process Heaters d[As stated in §63.7500, you must comply with the following applicable emission limits: [Units with heat input capacity of 10 million Btu per hour or greater]
If your boiler or process heater is in this subcategory . . .For the following pollutants . . .The emissions must not exceed the following emission limits, except during startup and shutdown . . .The emissions must not exceed the following alternative output-based limits, except during startup and shutdown . . .Using this specified sampling volume or test run duration . . .
a If you are conducting stack tests to demonstrate compliance and your performance tests for this pollutant for at least 2 consecutive years show that your emissions are at or below this limit, you can skip testing according to §63.7515 if all of the other provisions of §63.7515 are met. For all other pollutants that do not contain a footnote a, your performance tests for this pollutant for at least 2 consecutive years must show that your emissions are at or below 75 percent of this limit in order to qualify for skip testing.
b Incorporated by reference, see §63.14.
c An owner or operator may determine compliance with the carbon monoxide emissions limit be determined using CO 2 as a diluent correction in place of oxygen as described in §63.7525(a)(1). EPA Method 19 F-factors in 40 CFR part 60, appendix A-7, and EPA Method 19 equations in 40 CFR part 60, appendix A-7, must be used to generate the appropriate CO 2 correction percentage for the fuel type burned in the unit and must also take into account that the 3-percent oxygen correction is to be done on a dry basis. The methodology must account for any CO 2 being added to, or removed from, the emissions gas stream as a result of limestone injection, scrubber media, etc. This methodology must be detailed in the site-specific monitoring plan developed according to §63.7505(d).
d Before October 6, 2025 you may comply with the emission limits in Table 15 to this subpart. On and after October 6, 2025], you must comply with the emission limits in this Table 2.
1. Units in all subcategories designed to burn solid fuela. HCl2.0E-02 lb per MMBtu of heat input2.3E-02 lb per MMBtu of steam output or 0.26 lb per MWhFor M26A, collect a minimum of 1 dscm per run; for M26, collect a minimum of 120 liters per run.
b. Mercury5.4E-06 lb per MMBtu of heat input6.2E-06 lb per MMBtu of steam output or 6.9E-05 lb per MWhFor M29, collect a minimum of 3 dscm per run; for M30A or M30B, collect a minimum sample as specified in the method; for ASTM D6784 b collect a minimum of 3 dscm.
2. Units design to burn coal/solid fossil fuela. Filterable PM (or TSM)3.9E-02 lb per MMBtu of heat input; or (5.3E-05 lb per MMBtu of heat input)4.1E-02 lb per MMBtu of steam output or 4.8E-01 lb per MWh; or (5.6E-05 lb per MMBtu of steam output or 6.5E-04 lb per MWh)Collect a minimum of 2 dscm per run.
3. Pulverized coal boilers designed to burn coal/solid fossil fuela. CO (or CEMS)130 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (320 ppm by volume on a dry basis corrected to 3-percent oxygen, c 30-day rolling average)0.11 lb per MMBtu of steam output or 1.4 lb per MWh; 3-run average1 hr minimum sampling time.
4. Stokers/others designed to burn coal/solid fossil fuela. CO (or CEMS)150 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (340 ppm by volume on a dry basis corrected to 3-percent oxygen, c 30-day rolling average)0.14 lb per MMBtu of steam output or 1.6 lb per MWh; 3-run average1 hr minimum sampling time.
5. Fluidized bed units designed to burn coal/solid fossil fuela. CO (or CEMS)130 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (230 ppm by volume on a dry basis corrected to 3-percent oxygen, c 30-day rolling average)0.12 lb per MMBtu of steam output or 1.4 lb per MWh; 3-run average1 hr minimum sampling time.
6. Fluidized bed units with an integrated heat exchanger designed to burn coal/solid fossil fuela. CO (or CEMS)140 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (150 ppm by volume on a dry basis corrected to 3-percent oxygen, c 30-day rolling average)1.3E-01 lb per MMBtu of steam output or 1.5 lb per MWh; 3-run average1 hr minimum sampling time.
7. Stokers/sloped grate/others designed to burn wet biomass fuela. CO (or CEMS)1,100 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (720 ppm by volume on a dry basis corrected to 3-percent oxygen, c 30-day rolling average)1.1 lb per MMBtu of steam output or 13 lb per MWh; 3-run average1 hr minimum sampling time.
b. Filterable PM (or TSM)3.4E-02 lb per MMBtu of heat input; or (2.0E-04 lb per MMBtu of heat input)4.0E-02 lb per MMBtu of steam output or 4.8E-01 lb per MWh; or (2.4E-04 lb per MMBtu of steam output or 2.8E-03 lb per MWh)Collect a minimum of 2 dscm per run.
8. Stokers/sloped grate/others designed to burn kiln-dried biomass fuela. CO460 ppm by volume on a dry basis corrected to 3-percent oxygen4.2E-01 lb per MMBtu of steam output or 5.1 lb per MWh1 hr minimum sampling time.
b. Filterable PM (or TSM)3.2E-01 lb per MMBtu of heat input; or (5.0E-03 lb per MMBtu of heat input)3.7E-01 lb per MMBtu of steam output or 4.5 lb per MWh; or (5.9E-03 lb per MMBtu of steam output or 7.0E-02 lb per MWh)Collect a minimum of 1 dscm per run.
9. Fluidized bed units designed to burn biomass/bio-based solida. CO (or CEMS)210 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (310 ppm by volume on a dry basis corrected to 3-percent oxygen, c 30-day rolling average)2.1E-01 lb per MMBtu of steam output or 2.3 lb per MWh; 3-run average1 hr minimum sampling time.
b. Filterable PM (or TSM)7.4E-03 lb per MMBtu of heat input; or (6.4E-05 lb per MMBtu of heat input)9.2E-03 lb per MMBtu of steam output or 0.11 lb per MWh; or (8.0E-05 lb per MMBtu of steam output or 9.0E-04 lb per MWh)Collect a minimum of 1 dscm per run.
10. Suspension burners designed to burn biomass/bio-based solida. CO (or CEMS)2,400 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (2,000 ppm by volume on a dry basis corrected to 3-percent oxygen, c 10-day rolling average)1.9 lb per MMBtu of steam output or 27 lb per MWh; 3-run average1 hr minimum sampling time.
b. Filterable PM (or TSM)4.1E-02 lb per MMBtu of heat input; or (8.0E-03 lb per MMBtu of heat input)4.2E-02 lb per MMBtu of steam output or 5.8E-01 lb per MWh; or (8.1E-03 lb per MMBtu of steam output or 0.12 lb per MWh)Collect a minimum of 2 dscm per run.
11. Dutch Ovens/Pile burners designed to burn biomass/bio-based solida. CO (or CEMS)770 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (520 ppm by volume on a dry basis corrected to 3-percent oxygen, c 10-day rolling average)8.4E-01 lb per MMBtu of steam output or 8.4 lb per MWh; 3-run average1 hr minimum sampling time.
b. Filterable PM (or TSM)1.8E-01 lb per MMBtu of heat input; or (2.0E-03 lb per MMBtu of heat input)2.5E-01 lb per MMBtu of steam output or 2.6 lb per MWh; or (2.8E-03 lb per MMBtu of steam output or 2.8E-02 lb per MWh)Collect a minimum of 1 dscm per run.
12. Fuel cell units designed to burn biomass/bio-based solida. CO1,100 ppm by volume on a dry basis corrected to 3-percent oxygen2.4 lb per MMBtu of steam output or 12 lb per MWh1 hr minimum sampling time.
b. Filterable PM (or TSM)2.0E-02 lb per MMBtu of heat input; or (5.8E-03 lb per MMBtu of heat input)5.5E-02 lb per MMBtu of steam output or 2.8E-01 lb per MWh; or (1.6E-02 lb per MMBtu of steam output or 8.1E-02 lb per MWh)Collect a minimum of 2 dscm per run.
13. Hybrid suspension grate units designed to burn biomass/bio-based solida. CO (or CEMS)3,500 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average; or (900 ppm by volume on a dry basis corrected to 3-percent oxygen, c 30-day rolling average)3.5 lb per MMBtu of steam output or 39 lb per MWh; 3-run average1 hr minimum sampling time.
b. Filterable PM (or TSM)4.4E-01 lb per MMBtu of heat input; or (4.5E-04 lb per MMBtu of heat input)5.5E-01 lb per MMBtu of steam output or 6.2 lb per MWh; or (5.7E-04 lb per MMBtu of steam output or 6.3E-03 lb per MWh)Collect a minimum of 1 dscm per run.
14. Units designed to burn liquid fuela. HCl1.1E-03 lb per MMBtu of heat input1.4E-03 lb per MMBtu of steam output or 1.6E-02 lb per MWhFor M26A, collect a minimum of 2 dscm per run; for M26, collect a minimum of 240 liters per run.
b. Mercury7.3E-07 lb per MMBtu of heat input8.8E-07 lb per MMBtu of steam output or 1.1E-05 lb per MWhFor M29, collect a minimum of 3 dscm per run; for M30A or M30B collect a minimum sample as specified in the method, for ASTM D6784 b collect a minimum of 2 dscm.
15. Units designed to burn heavy liquid fuela. CO130 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average0.13 lb per MMBtu of steam output or 1.4 lb per MWh; 3-run average1 hr minimum sampling time.
b. Filterable PM (or TSM)5.9E-02 lb per MMBtu of heat input; or (2.0E-04 lb per MMBtu of heat input)7.2E-02 lb per MMBtu of steam output or 8.2E-01 lb per MWh; or (2.5E-04 lb per MMBtu of steam output or 2.8E-03 lb per MWh)Collect a minimum of 1 dscm per run.
16. Units designed to burn light liquid fuela. CO130 ppm by volume on a dry basis corrected to 3-percent oxygen0.13 lb per MMBtu of steam output or 1.4 lb per MWh1 hr minimum sampling time.
b. Filterable PM (or TSM)7.9E-03 lb per MMBtu of heat input; or (6.2E-05 lb per MMBtu of heat input)9.6E-03 lb per MMBtu of steam output or 1.1E-01 lb per MWh; or (7.5E-05 lb per MMBtu of steam output or 8.6E-04 lb per MWh)Collect a minimum of 3 dscm per run.
17. Units designed to burn liquid fuel that are non-continental unitsa. CO130 ppm by volume on a dry basis corrected to 3-percent oxygen, 3-run average based on stack test0.13 lb per MMBtu of steam output or 1.4 lb per MWh; 3-run average1 hr minimum sampling time.
b. Filterable PM (or TSM)2.2E-01 lb per MMBtu of heat input; or (8.6E-04 lb per MMBtu of heat input)2.7E-01 lb per MMBtu of steam output or 3.1 lb per MWh; or (1.1E-03 lb per MMBtu of steam output or 1.2E-02 lb per MWh)Collect a minimum of 2 dscm per run.
18. Units designed to burn gas 2 (other) gasesa. CO130 ppm by volume on a dry basis corrected to 3-percent oxygen0.16 lb per MMBtu of steam output or 1.0 lb per MWh1 hr minimum sampling time.
b. HCl1.7E-03 lb per MMBtu of heat input2.9E-03 lb per MMBtu of steam output or 1.8E-02 lb per MWhFor M26A, collect a minimum of 2 dscm per run; for M26, collect a minimum of 240 liters per run.
c. Mercury7.9E-06 lb per MMBtu of heat input1.4E-05 lb per MMBtu of steam output or 8.3E-05 lb per MWhFor M29, collect a minimum of 3 dscm per run; for M30A or M30B, collect a minimum sample as specified in the method; for ASTM D6784 b collect a minimum of 2 dscm.
d. Filterable PM (or TSM)7.3E-03 lb per MMBtu of heat input or (2.1E-04 lb per MMBtu of heat input)1.3E-02 lb per MMBtu of steam output or 7.6E-02 lb per MWh; or (3.5E-04 lb per MMBtu of steam output or 2.2E-03 lb per MWh)Collect a minimum of 3 dscm per run.

[78 FR 7195, Jan. 31, 2013, as amended at 80 FR 72821, Nov. 20, 2015; 87 FR 60849, Oct. 6, 2022]

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