23U.S. EPA, 2011c: AERSCREEN Released as the EPA Recommended Screening Model. Tyler
24Fox Memorandum dated April 11, 2011. U.S. Environmental Protection Agency,
25Research Triangle Park, North Carolina 27711.
27U.S EPA, 2011d AERMINUTE User’s Guide. U.S. Environmental Protection Agency,
28Research Triangle Park, North Carolina 27711.
30U.S. EPA, 2012a: Addendum – User’s Guide for the AMS/EPA Regulatory Model – AERMOD.
31EPA-454/B-03-001. U.S. Environmental Protection Agency, Research Triangle Park,
32North Carolina 27711.
34U.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
36Triangle Park, NC 27711.
Appendix C:Example of a Qualitative Assessment of the Potential 1 for Secondary PM2.5
4In late 2011, the EPA Region 10 Office developed a qualitative assessment of the
5potential for secondary fine particulate matter (PM2.5) formation to cause or contribute to a
6violation of the PM2.5 National Ambient Air Quality Standard (NAAQS) through a response to
7public comments document regarding a Clean Air Act permit issued for Shell’s Discoverer drill
8ship and support fleet to explore for oil and gas in the Chukchi Sea off Alaska. While the
9environment in and around the Chukchi Sea and North Slope of Alaska is unique when
10compared to the rest of the United States, the various components contained within this
11qualitative assessment provide a template that could be followed, with appropriate modifications,
12in the development of other case-specific qualitative assessments. An excerpt from this response
13to public comments document is provided below for reference.
15Additional information regarding this EPA Region 10 Office permit action can be found
16through the following web link: http://yosemite.epa.gov/R10/airpage.nsf/Permits/chukchiap/.
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD