Document ID: EPA-HQ-OAR-2015-0216-0076
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2015-09-18T04:00Z

From: Moore, Bruce 
Sent: Wednesday, July 29, 2015 4:41 PM
To: Szabo, Aaron
Cc: Cozzie, David; Spells, Charlene; Gilbreath, Jan; Owens, Nicole
Subject: Oil and Gas CTG -- Corrected presentation and links to ozone information

Aaron,

 Attached are two files:  (1) the revised briefing reflecting corrections to slide 9 "Estimate of Reductions and Cost" as discussed earlier today; and (2) slide 9 only, showing the changes we made to correct it.

 Also, as we agreed during the call today, the following is further information regarding ozone nonattainment areas and the potential effect of a revised ozone standard:

Interactive maps with PDF downloads:  http://www.epa.gov/airquality/ozonepollution/maps.html 
Powerpoint presentation slide #16:  http://www.epa.gov/airquality/ozonepollution/pdfs/2014decwebinar.pdf 

These maps show ozone data from  2011-2013 -- 458 counties had a monitor that would violate 70 ppb and 200 additional counties had a monitor that violate 65 ppb.

Caveats for application to CTG/RACT:
 If EPA revises the standard in 2015, nonattainment designations would be due under the Act by the end of 2017 and would likely be based on ozone air quality data from 2014-2016.  We expect that through existing rules and programs, ozone air quality will be better in 2017 than in 2013 such that fewer monitors would violate the range of standard levels under consideration.
 Outside the OTR, only areas classified Moderate and above are subject to RACT requirements.  We expect the vast majority of new nonattainment areas for a revised standard will be initially classified Marginal.  The Moderate classification is expected to apply only to areas with monitored air quality that is in excess of 15% above the level of the final standard.  For example, for a standard of 70 ppb the threshold for being classified Moderate is expected be 81 ppb, and for a standard of 65 ppb the threshold is expected to be 75 ppb.
   
Please forward this to your interagency review group,

Thanks,
Bruce

Bruce Moore
Senior Technical Advisor - Oil & Natural Gas Sector
Office of Air Quality Planning and Standards
U.S. Environmental Protection Agency
Research Triangle Park, NC 27711
(919) 541-5460
moore.bruce@epa.gov

For information, visit: www.epa.gov/airquality/oilandgas