ENVIRONMENTAL PROGRAMS DIVISION

AIR QUALITY PROGRAM

ENVIRONMENTAL PROGRAMS DIVISION

SOUTHERN UTE INDIAN TRIBE

PO BOX 737, MS 84, IGNACIO, CO 81137

Phone (970) 563-4705 - Fax (970) 563-0384

March 7, 2017

Technical Advisory Bulletin

To: All Tribal Title V Permittees:

This technical advisory bulletin is being issued to clarify the criteria that must be met for an emission unit to be

considered decommissioned by the Air Quality Program and excluded from potential to emit (PTE) calculations for

the purposes of Clean Air Act (CAA) permitting.

In order for an emission unit to be excluded from a facility’s PTE, the unit must be physically disconnected from the

process gas stream and permit revision applications submitted to and approved by the appropriate regulatory

agencies requesting removal of the emission unit from any CAA permits.

An example of a physically disconnected emission unit could be a dehydration unit that has been fully

disconnected from the natural gas stream and the natural gas lines blind flanged. In general, a physically

disconnected emission unit would require construction activities to reconnect the emissions unit to the process.

The closing of a valve, or lockout-tagout are examples of activities that would not constitute a physical

disconnection.

The submittal and approval of a CAA permit revision request is necessary to maintain an accurate representation

of the source’s PTE and CAA regulatory applicability for permitting purposes and to avoid potential confusion

during the source’s next compliance inspection.

For more information about the Southern Ute Indian Tribe Air Quality Program, please go to the following

webpage: http://www.southernute-nsn.gov/environmental-programs/air-quality/

If you have any questions regarding this request please contact Mr. Oakley Hayes, Air Quality Scientist, at (970)

563-2244 or me at (970) 563-2265.

Air Quality Program Manager

The Southern Ute Air Quality Program