Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
All TitlesTitle 40Chapter IPart 63Subpart DDDDDAppendix - Table 15 to Subpart DDDDD of Part 63—Alternative Emission Limits for Existing Boilers and Process Heaters d
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Appendix - Table 15 to Subpart DDDDD of Part 63—Alternative Emission Limits for Existing Boilers and Process Heaters d

As stated in § 63.7500, you may continue to comply with following emission limits until October 6, 2025:

[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 . . .
1. Units in all subcategories designed to burn solid fuela. HCl2.2E-02 lb per MMBtu of heat input2.5E-02 lb per MMBtu of steam output or 0.27 lb per MWhFor M26A, Collect a minimum of 1 dscm per run; for M26, collect a minimum of 120 liters per run.
b. Mercury5.7E-06 lb per MMBtu of heat input6.4E-06 lb per MMBtu of steam output or 7.3E-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 3 dscm.
2. Units design to burn coal/solid fossil fuela. Filterable PM (or TSM)4.0E-02 lb per MMBtu of heat input; or (5.3E-05 lb per MMBtu of heat input)4.2E-02 lb per MMBtu of steam output or 4.9E-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)160 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 1.7 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)1,500 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)1.4 lb per MMBtu of steam output or 17 lb per MWh; 3-run average1 hr minimum sampling time.
b. Filterable PM (or TSM)3.7E-02 lb per MMBtu of heat input; or (2.4E-04 lb per MMBtu of heat input)4.3E-02 lb per MMBtu of steam output or 5.2E-01 lb per MWh; or (2.8E-04 lb per MMBtu of steam output or 3.4E-04 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 (4.0E-03 lb per MMBtu of heat input)3.7E-01 lb per MMBtu of steam output or 4.5 lb per MWh; or (4.6E-03 lb per MMBtu of steam output or 5.6E-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)470 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)4.6E-01 lb per MMBtu of steam output or 5.2 lb per MWh; 3-run average1 hr minimum sampling time.
b. Filterable PM (or TSM)1.1E-01 lb per MMBtu of heat input; or (1.2E-03 lb per MMBtu of heat input)1.4E-01 lb per MMBtu of steam output or 1.6 lb per MWh; or (1.5E-03 lb per MMBtu of steam output or 1.7E-02 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)5.1E-02 lb per MMBtu of heat input; or (6.5E-03 lb per MMBtu of heat input)5.2E-02 lb per MMBtu of steam output or 7.1E-01 lb per MWh; or (6.6E-03 lb per MMBtu of steam output or 9.1E-02 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)2.8E-01 lb per MMBtu of heat input; or (2.0E-03 lb per MMBtu of heat input)3.9E-01 lb per MMBtu of steam output or 3.9 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. Mercury2.0E-06 lb per MMBtu of heat input2.5E-06 lb per MMBtu of steam output or 2.8E-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)6.2E-02 lb per MMBtu of heat input; or (2.0E-04 lb per MMBtu of heat input)7.5E-02 lb per MMBtu of steam output or 8.6E-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)2.7E-01 lb per MMBtu of heat input; or (8.6E-04 lb per MMBtu of heat input)3.3E-01 lb per MMBtu of steam output or 3.8 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)6.7E-03 lb per MMBtu of heat input or (2.1E-04 lb per MMBtu of heat input)1.2E-02 lb per MMBtu of steam output or 7.0E-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 three dscm per run.

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 using carbon dioxide 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 CO2 correction percentage for the fuel type burned in the unit, and must also take into account that the 3% oxygen correction is to be done on a dry basis. The methodology must account for any CO2 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 this Table 15. On and after October 6, 2025, you must comply with the emission limits in Table 2 to this subpart.

[87 FR 60863, Oct. 6, 2022]
authority: 42 U.S.C. 7401
source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.
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