40 CFR 63 Subpart XXXXXX (Nine Subpart 6X) covers nine metal fabrication and finishing categories with the potential to emit metal HAPs:
- Electric & Electronic Finishing
- Fabricated Metal Products
- Fabricated Plate Work (Boiler Shops)
- Fabricated Structural Metal
- Heating Equipment (except electric)
- Industrial Machinery & Equipment
- Iron & Steel Forging
- Valves & Pipe Fittings
Requirements for this rule vary depending on which category or categories a facility’s operations fall into. Please see the EPA published flowchart below to determine which requirements your facility must meet.
Initial Notification Dates
| Source Classification | Initial Notification Date |
|---|---|
| Existing Source (Constructed before 4/3/08) | July 25, 2011 |
| New Source (Constructed on or after 4/3/08) | July 23, 2008 or upon startup |
Compliance Dates
| Source Classification | Compliance Date |
|---|---|
| Existing Source (Constructed before 4/3/08) | July 25, 2011 |
| New Source (Constructed on or after 4/3/08) | July 23, 2008 or upon startup |
Notification of Compliance
| Source Classification | Compliance Notification Date |
|---|---|
| Existing Source (Constructed before 4/3/08) | November 22, 2011 |
| New Source (Constructed on or after 4/3/08) | July 23, 2008 or 120 days after startup |
OAQC Subpart 6X Initial Notification form 
OAQC Subpart 6X Notification of Compliance form
OAQC Subpart 6X Annual Notification of Compliance
*If you have trouble reading or accessing these forms, please contact OAQC at 402-444-6015.
Resources:
EPA published 6X flowchart
EPA published brochure for 6X sources
EPA’s Area Source rule page
e-CFR for Subpart XXXXXX
NDEQ Air Toxics page for 6X
*The City of Omaha cannot guarantee the accuracy or accessibility of any document published by outside agencies.*