- Table 2 to Subpart UUUUU of Part 63—Emission Limits for Existing EGUs
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 ( | 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 | 2.0E-1 lb/MMBtu or 1.5E0 lb/MWh | SO | 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 | 2.0E-1 lb/MMBtu or 1.5E0 lb/MWh | SO | 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 | 3.0E-1 lb/MMBtu or 2.0E0 lb/MWh | SO | 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 | 6E-1 lb/MMBtu or 9E0 lb/MWh | SO | 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. |
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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,
4 You may not use the alternate SO