Table 8 to Subpart DDDD of Part 63—Continuous Compliance With the Work Practice Requirements Requirements
| For . . . | For the following work practice requirements . . . | You must demonstrate continuous compliance by . . . |
|---|---|---|
| (1) Dry rotary dryer | Process furnish with an inlet moisture content less than or equal to 30 percent (by weight, dry basis) and operate with an inlet dryer temperature of less than or equal to 600 °F | Maintaining the 24-hour block average inlet furnish moisture content at less than or equal to 30 percent (by weight, dry basis) and maintaining the 24-hour block average inlet dryer temperature at less than or equal to 600 °F; and keeping records of the inlet temperature of furnish moisture content and inlet dryer temperature. |
| (2) Hardwood veneer dryer | Process less than 30 volume percent softwood species | Maintaining the volume percent softwood species processed below 30 percent and keeping records of the volume percent softwood species processed. |
| (3) Softwood veneer dryer | Minimize fugitive emissions from the dryer doors and the green end | Following (and documenting that you are following) your plan for minimizing fugitive emissions. |
| (4) Veneer redryers | Process veneer with an inlet moisture content of less than or equal to 25 percent (by weight, dry basis) | Maintaining the 24-hour block average inlet moisture content of the veneer processed at or below of less than or 25 percent and keeping records of the inlet moisture content of the veneer processed. |
| (5) Group 1 miscellaneous coating operations | Use non-HAP coatings as defined in § 63.2292 | Continuing to use non-HAP coatings and keeping records showing that you are using non-HAP coatings. |
| (6) Process units and control systems undergoing safety-related shutdown on and after August 13, 2021, except as noted in footnote “1” to this table | Follow documented site-specific procedures to ensure the flow of raw materials and fuel or process heat ceases and that material is removed from the process unit(s) as expeditiously as possible given the system design to reduce air emissions | Keeping records showing that you are following the work practice requirements during safety-related shutdowns. |
| (7) Pressurized refiners undergoing startup or shutdown on and after August 13, 2021, except as noted in footnote “1” to this table | Route exhaust gases from the pressurized refiner to its dryer control system no later than 15 minutes after wood is fed to the pressurized refiner during startup. Stop wood flow into the pressurized refiner no more than 15 minutes after wood fiber and exhaust gases from the pressurized refiner stop being routed to the dryer during shutdown | Keeping records showing that you are following the work practice requirements during pressurized refiner startup and shutdown events. |
| (8) Direct-fired softwood veneer dryers undergoing startup or shutdown of gas-fired burners on and after August 13, 2021, except as noted in footnote “1” to this table | Cease feeding green veneer into the softwood veneer dryer and minimize the amount of time direct gas-fired softwood veneer dryers are vented to the atmosphere due to the conditions described in § 63.2250(d) | Keeping records showing that you are following the work practice requirements while undergoing startup or shutdown of softwood veneer dryer direct gas-fired burners. |
| (9) Direct wood-fired PCWP dryers, direct natural gas-fired PCWP dryers, direct-fired lumber kilns, and associated combustion unit bypass stacks on and after July 6, 2029, except as noted in footnote “2” to this table | Conduct an annual tune-up of combustion unit(s) used to directly fire each PCWP dryer or lumber kiln as specified in § 63.2271(c); AND continuously monitor an indicator of bypass stack usage | Conducting and maintaining records of annual burner inspections and corrective actions taken; and continuously monitoring and recording the duration of combustion unit bypass stack usage according to §§ 63.2269(a) and (k) and 63.2270. |
| (10) Lumber kilns on and after July 6, 2029, except as noted in footnote “2” to this table | O&M plan developed under § 63.2241(e)(1) involving annual inspection of lumber kiln integrity and review of charge optimization practices and corrective actions | Operating according to your O&M plan developed under § 63.2241(e)(1); and conducting annual inspection of the integrity of the lumber kiln internal air flow and heat distribution components, reviewing charge optimization practices, implementing corrective actions, and maintaining records of corrective actions according to § 63.2241(e)(1)(c). |
| (11) Lumber kilns on and after July 6, 2029, except as noted in footnote “2” to this table | Temperature limit option under § 63.2241(e)(3)(i) | Operating the kiln with a dry bulb temperature limit no higher than the maximum limit specified in § 63.2241(e)(3)(i); and continuously monitoring dry bulb temperature; and maintaining records of the batch average or daily block average dry bulb temperature. |
| (12) Lumber kilns on and after July 6, 2029, except as noted in footnote “2” to this table | Hybrid option under § 63.2241(e)(3)(ii) | Operating the kiln with a dry bulb temperature limit no higher than the maximum limit specified in § 63.2241(e)(3)(ii)(A); and continuously monitoring dry bulb temperature; and maintaining records of the batch average or daily block average dry bulb temperature and continuously monitoring lumber moisture while drying lumber; and keeping records of the kiln-dried lumber moisture content for determination of the semiannual average according to § 63.2241(e)(3)(ii)(B) |
| (13) Lumber kilns on and after July 6, 2029, except as noted in footnote “2” to this table | Site-specific plan option for temperature and lumber moisture monitoring under § 63.2241(e)(3)(iii) | Operating the kiln using the approved site specific temperature limit and site-specific method for lumber moisture monitoring under § 63.2241(e)(3)(iii); continuously monitoring, recording, and calculating the 3-hour block average temperature under § 63.2241(e)(3)(iii)(A); continuously monitoring, recording, and calculating the monthly and semiannual average kiln-dried lumber moisture content under § 63.2241(e)(3)(iii)(B); and maintaining records and reporting corrective action as required in § 63.2241(e)(3)(iii)(B). |
| (14) Stand-alone digesters on and after July 6, 2029, except as noted in footnote “2” to this table | Use clean steam for injection into digestion process; and process fiber without addition of HAP-containing or wood pulping chemicals | Continuing to meet the work practice by using clean steam and processing fiber without addition of HAP-containing or wood pulping chemicals and keeping records showing that you continue to meet the work practice. |
| (15) Fiber washers on and after July 6, 2029, except as noted in footnote “2” to this table | Process fiber without addition of HAP-containing or wood pulping chemicals | Continuing to meet the work practice by processing fiber without addition of HAP-containing or wood pulping chemicals AND keeping records showing that you continue to meet the work practice. |
| (16) Log vats on and after July 6, 2029, except as noted in footnote “2” to this table | Operate the log vat with a target log temperature at or below 212 °F as specified in § 63.2241(f) | Continuing to meet the work practice by operating the log vat as specified in § 63.2241(f) and keeping records showing that you continue to meet the work practice. |
| (17) Resinated material handling (RMH) process units on and after July 6, 2029, except as noted in footnote “2” to this table | Work practice requirements specified in § 63.2241(g) | Continuing to meet the work practice requirements in § 63.2241(g) and keeping records showing that you continue to meet the work practice. |
| 1 New or reconstructed affected sources that commenced construction or reconstruction after September 6, 2019, must comply with this requirement beginning on August 13, 2020, or upon initial startup, whichever is later. | ||
| 2 New or reconstructed affected sources that commenced construction or reconstruction after May 18, 2023, must comply with this requirement beginning on July 6, 2026, or upon initial startup, whichever is later. |
[91 FR 41452, July 6, 2026]