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Table 2 to Subpart UUUUU of Part 63 - Emission Limits for Existing EGUs

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

As stated in �63.9991, you must comply with the following applicable emission limits: 1

If your EGU is in this subcategory . . . For the following pollutants . . . You must meet the following emission limits and work practice standards . . . Using these requirements, as appropriate (e.g., specified sampling volume or test run duration) and limitations with the test methods in Table 5 to this Subpart . . .
1 For LEE emissions testing for total PM, total HAP metals, individual HAP metals, HCl, and HF, the required minimum sampling volume must be increased nominally by a factor of 2. With the exception of IGCC units, on or after July 6, 2027 you may not pursue the LEE option for filterable PM, total non-Hg metals, and individual HAP metals and you may not comply with the total non-Hg HAP metals or individual HAP metals emissions limits for all existing EGU subcategories unless you request and receive approval for the use of a HAP metals CMS under �63.7(f).
2 Gross output.
3 Incorporated by reference, see �63.14.
4 You may not use the alternate SO 2 limit if your EGU does not have some form of FGD system and SO 2 CEMS installed.
1. Coal-fired unit not low rank virgin coal a. Filterable particulate matter (PM) Before July 6, 2027: 3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2 Before July 6, 2027: Collect a minimum of 1 dscm per run.
On or after July 6, 2027: 1.0E-2 lb/MMBtu or 1.0E-1 lb/MWh 2 On or after July 6, 2027: Collect a minimum catch of 6.0 milligrams or a minimum sample volume of 4 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following total non-Hg HAP metals emission limit if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Total non-Hg HAP metals Before July 6, 2027: 5.0E-5 lb/MMBtu or 5.0E-1 lb/GWh On or after July 6, 2027: 1.7E-5 lb/MMBtu or 1.7E-1 lb/GWh Collect a minimum of 1 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following individual HAP metals emissions limits if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Individual HAP metals: Collect a minimum of 3 dscm per run.
Antimony (Sb) Before July 6, 2027: 8.0E-1 lb/TBtu or 8.0E-3 lb/GWh On or after July 6, 2027: 2.7E-1 lb/TBtu or 2.7E-3 lb/GWh
Arsenic (As) Before July 6, 2027: 1.1E0 lb/TBtu or 2.0E-2 lb/GWh On or after July 6, 2027: 3.7E-1 lb/TBtu or 6.7E-3 lb/GWh
Beryllium (Be) Before July 6, 2027: 2.0E-1 lb/TBtu or 2.0E-3 lb/GWh On or after July 6, 2027: 6.7E-2 lb/TBtu or 6.7E-4 lb/GWh
Cadmium (Cd) Before July 6, 2027: 3.0E-1 lb/TBtu or 3.0E-3 lb/GWh On or after July 6, 2027: 1.0E-1 lb/TBtu or 1.0E-3 lb/GWh
Chromium (Cr) Before July 6, 2027: 2.8E0 lb/TBtu or 3.0E-2 lb/GWh On or after July 6, 2027: 9.3E-1 lb/TBtu or 1.0E-2 lb/GWh
Cobalt (Co) Before July 6, 2027: 8.0E-1 lb/TBtu or 8.0E-3 lb/GWh On or after July 6, 2027: 2.7E-1 lb/TBtu or 2.7E-3 lb/GWh
Lead (Pb) Before July 6, 2027: 1.2E0 lb/TBtu or 2.0E-2 lb/GWh On or after July 6, 2027: 4.0E-1 lb/TBtu or 6.7E-3 lb/GWh
Manganese (Mn) Before July 6, 2027: 4.0E0 lb/TBtu or 5.0E-2 lb/GWh On or after July 6, 2027: 1.3E0 lb/TBtu or 1.7E-2 lb/GWh
Nickel (Ni) Before July 6, 2027: 3.5E0 lb/TBtu or 4.0E-2 lb/GWh On or after July 6, 2027: 1.2E0 lb/TBtu or 1.3E-2 lb/GWh
Selenium (Se) Before July 6, 2027: 5.0E0 lb/TBtu or 6.0E-2 lb/GWh On or after July 6, 2027: 1.7E0 lb/TBtu or 2.0E-2 lb/GWh
b. Hydrogen chloride (HCl) 2.0E-3 lb/MMBtu or 2.0E-2 lb/MWh For Method 26A at appendix A-8 to part 60 of this chapter, collect a minimum of 0.75 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320 at appendix A to part 63 of this chapter, sample for a minimum of 1 hour.
OR
Sulfur dioxide (SO 2) 4 2.0E-1 lb/MMBtu or 1.5E0 lb/MWh SO 2 CEMS.
c. Mercury (Hg) 1.2E0 lb/TBtu or 1.3E-2 lb/GWh LEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B at appendix A-8 to part 60 of this chapter run or Hg CEMS or sorbent trap monitoring system only.
OR
1.0E0 lb/TBtu or 1.1E-2 lb/GWh LEE Testing for 90 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.
2. Coal-fired unit low rank virgin coal a. Filterable particulate matter (PM) Before July 6, 2027: 3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2 On or after July 6, 2027: 1.0E-2 lb/MMBtu or 1.0E-1 lb/MWh 2 Before July 6, 2027: Collect a minimum of 1 dscm per run. On or after July 6, 2027: Collect a minimum catch of 6.0 milligrams or a minimum sample volume of 4 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following total non-Hg HAP metals emission limit if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Total non-Hg HAP metals Before July 6, 2027: 5.0E-5 lb/MMBtu or 5.0E-1 lb/GWh On or after July 6, 2027: 1.7E-5 lb/MMBtu or 1.7E-1 lb/GWh Collect a minimum of 1 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following individual HAP metals emissions limits if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Individual HAP metals: Collect a minimum of 3 dscm per run.
Antimony (Sb) Before July 6, 2027: 8.0E-1 lb/TBtu or 8.0E-3 lb/GWh On or after July 6, 2027: 2.7E-1 lb/TBtu or 2.7E-3 lb/GWh
Arsenic (As) Before July 6, 2027: 1.1E0 lb/TBtu or 2.0E-2 lb/GWh On or after July 6, 2027: 3.7E-1 lb/TBtu or 6.7E-3 lb/GWh
Beryllium (Be) Before July 6, 2027: 2.0E-1 lb/TBtu or 2.0E-3 lb/GWh On or after July 6, 2027: 6.7E-2 lb/TBtu or 6.7E-4 lb/GWh
Cadmium (Cd) Before July 6, 2027: 3.0E-1 lb/TBtu or 3.0E-3 lb/GWh On or after July 6, 2027: 1.0E-1 lb/TBtu or 1.0E-3 lb/GWh
Chromium (Cr) Before July 6, 2027: 2.8E0 lb/TBtu or 3.0E-2 lb/GWh On or after July 6, 2027: 9.3E-1 lb/TBtu or 1.0E-2 lb/GWh
Cobalt (Co) Before July 6, 2027: 8.0E-1 lb/TBtu or 8.0E-3 lb/GWh On or after July 6, 2027: 2.7E-1 lb/TBtu or 2.7E-3 lb/GWh
Lead (Pb) Before July 6, 2027: 1.2E0 lb/TBtu or 2.0E-2 lb/GWh On or after July 6, 2027: 4.0E-1 lb/TBtu or 6.7E-3 lb/GWh
Manganese (Mn) Before July 6, 2027: 4.0E0 lb/TBtu or 5.0E-2 lb/GWh On or after July 6, 2027: 1.3E0 lb/TBtu or 1.7E-2 lb/GWh
Nickel (Ni) Before July 6, 2027: 3.5E0 lb/TBtu or 4.0E-2 lb/GWh On or after July 6, 2027: 1.2E0 lb/TBtu or 1.3E-2 lb/GWh
Selenium (Se) Before July 6, 2027: 5.0E0 lb/TBtu or 6.0E-2 lb/GWh On or after July 6, 2027: 1.7E0 lb/TBtu or 2.0E-2 lb/GWh
b. Hydrogen chloride (HCl) 2.0E-3 lb/MMBtu or 2.0E-2 lb/MWh For Method 26A, collect a minimum of 0.75 dscm per run; for Method 26 at appendix A-8 to part 60 of this chapter, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
OR OR
Sulfur dioxide (SO 2) 4 2.0E-1 lb/MMBtu or 1.5E0 lb/MWh SO 2 CEMS.
c. Mercury (Hg) Before July 6, 2027: 4.0E0 lb/TBtu or 4.0E-2 lb/GWh On or after July 6, 2027: 1.2E0 lb/TBtu or 1.3E-2 lb/GWh LEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.
3. IGCC unit a. Filterable particulate matter (PM) 4.0E-2 lb/MMBtu or 4.0E-1 lb/MWh 2 Before July 6, 2027: Collect a minimum of 1 dscm per run. On or after July 6, 2027: Collect a minimum catch of 3.0 milligrams or a minimum sample volume of 2 dscm per run.
OR OR
Total non-Hg HAP metals 6.0E-5 lb/MMBtu or 5.0E-1 lb/GWh Collect a minimum of 1 dscm per run.
OR OR
Individual HAP metals: Collect a minimum of 2 dscm per run.
Antimony (Sb) 1.4E0 lb/TBtu or 2.0E-2 lb/GWh
Arsenic (As) 1.5E0 lb/TBtu or 2.0E-2 lb/GWh
Beryllium (Be) 1.0E-1 lb/TBtu or 1.0E-3 lb/GWh
Cadmium (Cd) 1.5E-1 lb/TBtu or 2.0E-3 lb/GWh
Chromium (Cr) 2.9E0 lb/TBtu or 3.0E-2 lb/GWh
Cobalt (Co) 1.2E0 lb/TBtu or 2.0E-2 lb/GWh
Lead (Pb) 1.9E+2 lb/TBtu or 1.8E0 lb/GWh
Manganese (Mn) 2.5E0 lb/TBtu or 3.0E-2 lb/GWh
Nickel (Ni) 6.5E0 lb/TBtu or 7.0E-2 lb/GWh
Selenium (Se) 2.2E+1 lb/TBtu or 3.0E-1 lb/GWh
b. Hydrogen chloride (HCl) 5.0E-4 lb/MMBtu or 5.0E-3 lb/MWh For Method 26A, collect a minimum of 1 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
c. Mercury (Hg) 2.5E0 lb/TBtu or 3.0E-2 lb/GWh LEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.
4. Liquid oil-fired unit�continental (excluding limited-use liquid oil-fired subcategory units) a. Filterable particulate matter (PM) 3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2 Collect a minimum of 1 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following total non-Hg HAP metals emission limit if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Total HAP metals 8.0E-4 lb/MMBtu or 8.0E-3 lb/MWh Collect a minimum of 1 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following individual HAP metals emissions limits if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Individual HAP metals: Collect a minimum of 1 dscm per run.
Antimony (Sb) 1.3E+1 lb/TBtu or 2.0E-1 lb/GWh
Arsenic (As) 2.8E0 lb/TBtu or 3.0E-2 lb/GWh
Beryllium (Be) 2.0E-1 lb/TBtu or 2.0E-3 lb/GWh
Cadmium (Cd) 3.0E-1 lb/TBtu or 2.0E-3 lb/GWh
Chromium (Cr) 5.5E0 lb/TBtu or 6.0E-2 lb/GWh
Cobalt (Co) 2.1E+1 lb/TBtu or 3.0E-1 lb/GWh
Lead (Pb) 8.1E0 lb/TBtu or 8.0E-2 lb/GWh
Manganese (Mn) 2.2E+1 lb/TBtu or 3.0E-1 lb/GWh
Nickel (Ni) 1.1E+2 lb/TBtu or 1.1E0 lb/GWh
Selenium (Se) 3.3E0 lb/TBtu or 4.0E-2 lb/GWh
Mercury (Hg) 2.0E-1 lb/TBtu or 2.0E-3 lb/GWh For Method 30B sample volume determination (Section 8.2.4), the estimated Hg concentration should nominally be < 1/2 the standard.
b. Hydrogen chloride (HCl) 2.0E-3 lb/MMBtu or 1.0E-2 lb/MWh For Method 26A, collect a minimum of 1 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
c. Hydrogen fluoride (HF) 4.0E-4 lb/MMBtu or 4.0E-3 lb/MWh For Method 26A, collect a minimum of 1 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
5. Liquid oil-fired unit�non-continental (excluding limited-use liquid oil-fired subcategory units) a. Filterable particulate matter (PM) 3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2 Collect a minimum of 1 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following total non-Hg HAP metals emission limit if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Total HAP metals 6.0E-4 lb/MMBtu or 7.0E-3 lb/MWh Collect a minimum of 1 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following individual HAP metals emissions limits if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Individual HAP metals: Collect a minimum of 2 dscm per run.
Antimony (Sb) 2.2E0 lb/TBtu or 2.0E-2 lb/GWh
Arsenic (As) 4.3E0 lb/TBtu or 8.0E-2 lb/GWh
Beryllium (Be) 6.0E-1 lb/TBtu or 3.0E-3 lb/GWh
Cadmium (Cd) 3.0E-1 lb/TBtu or 3.0E-3 lb/GWh
Chromium (Cr) 3.1E+1 lb/TBtu or 3.0E-1 lb/GWh
Cobalt (Co) 1.1E+2 lb/TBtu or 1.4E0 lb/GWh
Lead (Pb) 4.9E0 lb/TBtu or 8.0E-2 lb/GWh
Manganese (Mn) 2.0E+1 lb/TBtu or 3.0E-1 lb/GWh
Nickel (Ni) 4.7E+2 lb/TBtu or 4.1E0 lb/GWh
Selenium (Se) 9.8E0 lb/TBtu or 2.0E-1 lb/GWh
Mercury (Hg) 4.0E-2 lb/TBtu or 4.0E-4 lb/GWh For Method 30B sample volume determination (Section 8.2.4), the estimated Hg concentration should nominally be < 1/2 the standard.
b. Hydrogen chloride (HCl) 2.0E-4 lb/MMBtu or 2.0E-3 lb/MWh For Method 26A, collect a minimum of 1 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 2 hours.
c. Hydrogen fluoride (HF) 6.0E-5 lb/MMBtu or 5.0E-4 lb/MWh For Method 26A, collect a minimum of 3 dscm per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 2 hours.
6. Solid oil-derived fuel-fired unit a. Filterable particulate matter (PM) 8.0E-3 lb/MMBtu or 9.0E-2 lb/MWh 2 Before July 6, 2027: Collect a minimum of 1 dscm per run. On or after July 6, 2027: Collect a minimum catch of 6.0 milligrams or a minimum sample volume of 4 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following total non-Hg HAP metals emission limit if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Total non-Hg HAP metals 4.0E-5 lb/MMBtu or 6.0E-1 lb/GWh Collect a minimum of 1 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following individual HAP metals emissions limits if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Individual HAP metals: Collect a minimum of 3 dscm per run.
Antimony (Sb) 8.0E-1 lb/TBtu or 7.0E-3 lb/GWh
Arsenic (As) 3.0E-1 lb/TBtu or 5.0E-3 lb/GWh
Beryllium (Be) 6.0E-2 lb/TBtu or 5.0E-4 lb/GWh
Cadmium (Cd) 3.0E-1 lb/TBtu or 4.0E-3 lb/GWh
Chromium (Cr) 8.0E-1 lb/TBtu or 2.0E-2 lb/GWh
Cobalt (Co) 1.1E0 lb/TBtu or 2.0E-2 lb/GWh
Lead (Pb) 8.0E-1 lb/TBtu or 2.0E-2 lb/GWh
Manganese (Mn) 2.3E0 lb/TBtu or 4.0E-2 lb/GWh
Nickel (Ni) 9.0E0 lb/TBtu or 2.0E-1 lb/GWh
Selenium (Se) 1.2E0 lb/TBtu or 2.0E-2 lb/GWh
b. Hydrogen chloride (HCl) 5.0E-3 lb/MMBtu or 8.0E-2 lb/MWh For Method 26A, collect a minimum of 0.75 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320, sample for a minimum of 1 hour.
OR OR
Sulfur dioxide (SO 2) 4 3.0E-1 lb/MMBtu or 2.0E0 lb/MWh SO 2 CEMS.
c. Mercury (Hg) 2.0E-1 lb/TBtu or 2.0E-3 lb/GWh LEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.
7. Eastern Bituminous Coal Refuse (EBCR)-fired unit a. Filterable particulate matter (PM) Before July 6, 2027: 3.0E-2 lb/MMBtu or 3.0E-1 lb/MWh 2 On or after July 6, 2027: 1.0E-2 lb/MMBtu or 1.0E-1 lb/MWh 2 Before July 6, 2027: Collect a minimum of 1 dscm per run. On or after July 6, 2027: Collect a minimum catch of 6.0 milligrams or a minimum sample volume of 4 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following total non-Hg HAP metals emission limit if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Total non-Hg HAP metals Before July 6, 2027: 5.0E-5 lb/MMBtu or 5.0E-1 lb/GWh On or after July 6, 2027: 1.7E-5 lb/MMBtu or 1.7E-1 lb/GWh Collect a minimum of 1 dscm per run.
OR OR On or after July 6, 2027 you may only demonstrate compliance with the following individual HAP metals emissions limits if you request and receive approval for the use of a non-Hg HAP metals CMS under 40 CFR 63.7(f).
Individual HAP metals: Collect a minimum of 3 dscm per run.
Antimony (Sb) Before July 6, 2027: 8.0E-1 lb/TBtu or 8.0E-3 lb/GWh On or after July 6, 2027: 2.7E-1 lb/TBtu or 2.7E-3 lb/GWh
Arsenic (As) Before July 6, 2027: 1.1E0 lb/TBtu or 2.0E-2 lb/GWh On or after July 6, 2027: 3.7E-1 lb/TBtu or 6.7E-3 lb/GWh
Beryllium (Be) Before July 6, 2027: 2.0E-1 lb/TBtu or 2.0E-3 lb/GWh On or after July 6, 2027: 6.7E-2 lb/TBtu or 6.7E-4 lb/GWh
Cadmium (Cd) Before July 6, 2027: 3.0E-1 lb/TBtu or 3.0E-3 lb/GWh On or after July 6, 2027: 1.0E-1 lb/TBtu or 1.0E-3 lb/GWh
Chromium (Cr) Before July 6, 2027: 2.8E0 lb/TBtu or 3.0E-2 lb/GWh On or after July 6, 2027: 9.3E-1 lb/TBtu or 1.0E-2 lb/GWh
Cobalt (Co) Before July 6, 2027: 8.0E-1 lb/TBtu or 8.0E-3 lb/GWh On or after July 6, 2027: 2.7E-1 lb/TBtu or 2.7E-3 lb/GWh
Lead (Pb) Before July 6, 2027: 1.2E0 lb/TBtu or 2.0E-2 lb/GWh On or after July 6, 2027: 4.0E-1 lb/TBtu or 6.7E-3 lb/GWh
Manganese (Mn) Before July 6, 2027: 4.0E0 lb/TBtu or 5.0E-2 lb/GWh On or after July 6, 2027: 1.3E0 lb/TBtu or 1.7E-2 lb/GWh
Nickel (Ni) Before July 6, 2027: 3.5E0 lb/TBtu or 4.0E-2 lb/GWh On or after July 6, 2027: 1.2E0 lb/TBtu or 1.3E-2 lb/GWh
Selenium (Se) Before July 6, 2027: 5.0E0 lb/TBtu or 6.0E-2 lb/GWh On or after July 6, 2027: 1.7E0 lb/TBtu or 2.0E-2 lb/GWh
b. Hydrogen chloride (HCl) 4.0E-2 lb/MMBtu or 4.0E-1 lb/MWh For Method 26A at appendix A-8 to part 60 of this chapter, collect a minimum of 0.75 dscm per run; for Method 26, collect a minimum of 120 liters per run. For ASTM D6348-03 (Reapproved 2010) 3 or Method 320 at appendix A to part 63 of this chapter, sample for a minimum of 1 hour.
OR
Sulfur dioxide (SO 2) 4 6E-1 lb/MMBtu or 9E0 lb/MWh SO 2 CEMS.
c. Mercury (Hg) 1.2E0 lb/TBtu or 1.3E-2 lb/GWh LEE Testing for 30 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B at appendix A-8 to part 60 of this chapter run or Hg CEMS or sorbent trap monitoring system only.
OR
1.0E0 lb/TBtu or 1.1E-2 lb/GWh LEE Testing for 90 days with a sampling period consistent with that given in section 5.2.1 of appendix A to this subpart per Method 30B run or Hg CEMS or sorbent trap monitoring system only.

[81 FR 20192, Apr. 6, 2016; 85 FR 20850, April 15, 2020; 89 FR 38571, May 7, 2024]

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