23 U.S. EPA, 2011c: AERSCREEN Released as the EPA Recommended Screening Model. Tyler

24 Fox Memorandum dated April 11, 2011. U.S. Environmental Protection Agency,

25 Research Triangle Park, North Carolina 27711.

26 http://www.epa.gov/ttn/scram/20110411_AERSCREEN_Release_Memo.pdf

27 U.S EPA, 2011d AERMINUTE User’s Guide. U.S. Environmental Protection Agency,

28 Research Triangle Park, North Carolina 27711.

29 http://www.epa.gov/ttn/scram/7thconf/aermod/aerminute_v11325.zip

30 U.S. EPA, 2012a: Addendum – User’s Guide for the AMS/EPA Regulatory Model – AERMOD.

31 EPA-454/B-03-001. U.S. Environmental Protection Agency, Research Triangle Park,

32 North Carolina 27711.

33 http://www.epa.gov/ttn/scram/models/aermod/aermod_userguide.zip

34 U.S. EPA, 2012b: Addendum - User’s Guide for the AERMOD Meteorological Preprocessor

35 (AERMET). EPA-454/B-03-002. U.S. Environmental Protection Agency, Research

36 Triangle Park, NC 27711.

37 http://www.epa.gov/ttn/scram/7thconf/aermod/aermet_userguide.zip

 

Appendix C: Example of a Qualitative Assessment of the Potential 1 for Secondary PM2.5

2 Formation

3

4 In late 2011, the EPA Region 10 Office developed a qualitative assessment of the

5 potential for secondary fine particulate matter (PM2.5) formation to cause or contribute to a

6 violation of the PM2.5 National Ambient Air Quality Standard (NAAQS) through a response to

7 public comments document regarding a Clean Air Act permit issued for Shell’s Discoverer drill

8 ship and support fleet to explore for oil and gas in the Chukchi Sea off Alaska. While the

9 environment in and around the Chukchi Sea and North Slope of Alaska is unique when

10 compared to the rest of the United States, the various components contained within this

11 qualitative assessment provide a template that could be followed, with appropriate modifications,

12 in the development of other case-specific qualitative assessments. An excerpt from this response

13 to public comments document is provided below for reference.

14

15 Additional information regarding this EPA Region 10 Office permit action can be found

16 through the following web link: http://yosemite.epa.gov/R10/airpage.nsf/Permits/chukchiap/.

 

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