3) Secondary PM2.5 impacts associated with Discoverer and Associated Fleet

45 precursor emissions are expected to be low near the emission release points where

46 modeled concentrations associated with primary PM2.5 emissions are highest,

Public Review Draft 03/04/2013


because there has not been enough time for the secondary 1 chemical reactions to

2 occur. Conversely, secondary PM2.5 impacts are more likely to be higher farther

3 from the Discoverer and the Associated Fleet where impacts from primary PM2.5

4 emissions from the Discoverer and the Associated Fleet are expected to be lower.

5 This makes it unlikely that maximum primary PM2.5 impacts and maximum

6 secondary PM2.5 impacts from the Discoverer and the Associated Fleet will occur

7 at the same time (paired in time) or location (paired in space). See March 23,

8 2010 PM2.5 Guidance Memo at 9.

4) The relatively small amount of NOX emissions (a PM2.5 precursor) that will be

11 authorized under these permits in comparison to existing NOX emissions in the

12 North Slope area in general, together with the generally low levels of PM2.5

13 recorded at monitoring stations in the area, make it unlikely that NOX emissions

14 from the Discoverer and the Associated Fleet would cause or contribute to a

15 violation of the PM2.5 NAAQS.



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