Regulations last checked for updates: Sep 17, 2025

Title 40 - Protection of Environment last revised: Nov 17, 2025
Appendix - Table 2a to Subpart FFFF of Part 60—Model Rule—Emission Limitations That Apply to OSWI Units With Capacities Less Than or Equal to 10 Tons per Day On or After [Date To Be Specified in State Plan] a

As stated in § 60.3022, you must comply with the following:

For the air pollutant You must meet this emission limitation b Using this averaging time And determining compliance using this method
1. Cadmium2,000 micrograms per dry standard cubic meter3-run average (1 hour minimum sample time per run)Method 29 of Appendix A to this part.
2. Carbon monoxide220 parts per million by dry volume3-run average (1 hour minimum sample time per run during performance test), and 12-hour rolling averages measured using CEMS cMethod 10, 10A, or 10B of Appendix A to this part and CEMS.
3a. Dioxins/furans (total mass basis) d4,700 nanograms per dry standard cubic meter3-run average (1 hour minimum sample time per run)Method 23 of Appendix A to this part.
3b. Dioxins/furans (toxic equivalency basis) d86 nanograms per dry standard cubic meter3-run average (1 hour minimum sample time per run)Method 23 of Appendix A to this part.
4. Hydrogen chloride500 parts per million by dry volume3-run average (1 hour minimum sample time per run)Method 26A of Appendix A to this part.
5. Lead32,000 micrograms per dry standard cubic meter3-run average (1 hour minimum sample time per run)Method 29 of Appendix A to this part.
6. Mercury69 micrograms per dry standard cubic meter3-run average (1 hour minimum sample time per run)Method 29 of Appendix A to this part.
7. Opacity10 percent6-minute average (observe over three 1-hour test runs; i.e., thirty 6-minute averages)Method 9 of Appendix A to this part, or ASTM D7520-16(IBR, see § 60.17), if the following conditions are met:
1. During the digital camera opacity technique (DCOT) certification procedure outlined in Section 9.2 of ASTM D7520-16, you or the DCOT vendor must present the plumes in front of various backgrounds of color and contrast representing conditions anticipated during field use such as blue sky, trees, and mixed backgrounds (clouds and/or a sparse tree stand).
2. You must also have standard operating procedures in place including daily or other frequency quality checks to ensure the equipment is within manufacturing specifications as outlined in Section 8.1 of ASTM D7520-16.
3. You must follow the recordkeeping procedures outlined in § 63.10(b)(1) of this subchapter for the DCOT certification, compliance report, data sheets, and all raw unaltered JPEGs used for opacity and certification determination.
4. You or the DCOT vendor must have a minimum of four independent technology users apply the software to determine the visible opacity of the 300 certification plumes. For each set of 25 plumes, the user may not exceed 15 percent opacity of any one reading and the average error must not exceed 7.5 percent opacity.
8. Oxides of nitrogen210 parts per million by dry volume3-run average (1 hour minimum sample time per run)Method 7, 7A, 7C, 7D, or 7E of Appendix A to this part, or ASME/ANSI PTC 19.10-1981 (IBR, see § 60.17) in lieu of Methods 7 and 7C only.
9. Particulate matter280 milligrams per dry standard cubic meter3-run average (1 hour minimum sample time per run)Method 5 or 29 of Appendix A to this part.
10. Sulfur dioxide130 parts per million by dry volume3-run average (1 hour minimum sample time per run)Method 6 or 6C of Appendix A to this part, or ASME/ANSI PTC 19.10-1981(IBR, see § 60.17) in lieu of Method 6 only.

a The date can be no later than 3 years after the effective date of state plan approval or July 1, 2030, whichever is earlier.

b All emission limitations (except for opacity) are measured at 7 percent oxygen, dry basis at standard conditions. CEMS data during startup and shutdown are measured at stack oxygen content.

c Calculated each hour as the average of the previous 12 operating hours.

d For dioxins/furans, you must meet either the total mass basis limit or the toxic equivalency basis limit.

[90 FR 27968, June 30, 2025]
authority: 42 U.S.C. 7401
source: 36 FR 24877, Dec. 23, 1971, unless otherwise noted.