Document ID: EPA-HQ-OAR-2017-0003-0319
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2017-09-06T04:00Z

From:	Bacon, Leigh <LBB@adem.alabama.gov>
Sent:	Thursday, February 2, 2017 9:05 AM
To:	Walther, Katherine
Subject:	FW: Competing Source Inventory for the DRR
Attachments:	GastonDRR525.xlsx

From: Bacon, Leigh  
Sent: Wednesday, May 25, 2016 1:47 PM 
To: Bacon, Leigh 
Subject: FW: Competing Source Inventory for the DRR

From: Bacon, Leigh  
Sent: Wednesday, May 25, 2016 1:47 PM 
To: 'Steele, C. Mark' 
Cc: Carlson, James; Brown, Larry; Graham, Amy 
Subject: Competing Source Inventory for the DRR

Mr. Steele,
Please find enclosed a model ready inventory for the area surrounding the Gaston Steam Plant in 
Wilsonville, Alabama.  This inventory represents a starting point for further evaluation, as decided by the 
facility, to meet the requirements of EPA’s 1 hour SO2 Data Requirements Rule (DRR).  The basis for the 
inventory was the use of the following metric in culling facilities, then an evaluation of the emissions 
units at the remaining facilities on a unit by unit basis.  This process is laid out below for your 
information.  Please let me know if you have any questions about the inventory.  Otherwise, have a 
great afternoon.

ADEM Metric:     Q/D > 20 within 20km
*	First, ALL sources within 20km of YOUR facility were pulled,
*	Next, a Q/D value was developed for each facility on the list, where Q represents the SO2 tpy 
emissions totals, and D represents the distance between the two facilities,
*	If the Q/D metric yielded a value of greater than 20, the facility was retained and additional 
QA/QC was performed on a unit by unit basis.

The results of this process are included in the spreadsheet attached. Again, please feel free to contact 
me with questions.

Thank you,

Leigh

Leigh Barb Bacon
State of AL- DEM
p- 334-270-5689