----- Forwarded by RobertJ Wayland/RTP/USEPA/US on 05/27/2011 11:12 PM
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  |"Wehrum, William L." <wwehrum@hunton.com>                                                                                                 
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  |RobertJ Wayland/RTP/USEPA/US@EPA                                                                                                          
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  |"Admire, John D" <JDAdmire@dcpmidstream.com>, "Grygar, Bill" 
<Bill.Grygar@anadarko.com>, "Adams, Jeffrey A" <jeffrey.adams@bp.com>, "Matt |
  |Todd" <ToddM@api.org>, "Lisa Beal" <lbeal@ingaa.org>                                                                                      
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  |05/27/2011 03:12 PM                                                                                                                       
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  |Additional RICE MACT Information                                                                                                          


Bob -- in preparation for our meeting with you next week on the RICE MACT, I'm 
forwarding additional information on the DOT pipeline classification system.  
We had thought that DOT/PHMSA had readily available and useful overview 
materials on the system that you could use to better understand how it works.  
On further review, we have not found anything suitable from DOT/PHMSA.

So, we are instead providing the two attached documents.  The first is a 
summary and overview of the relevant rules.  The second is a set of diagrams 
that illustrate how the rules should be applied.

In addition, you have asked for an estimate of how many large area source RICE 
would be in Class 1 versus Classes 2, 3, and 4.  To get a sense of this, we 
polled companies belonging to the various petitioners'
groups.  Although this is not a scientific survey, we believe that the results 
should be representative for the sectors we represent.  Here are the results:

Total companies reporting:  17.

Total number of > 500 hp area source RICE reported:  4140.

Number of engines in Class 1:  3572 (86% of total).

Number of engines in other classes:  568 (14% of total).

We hope that you find this information useful.  Please don't hesitate to call 
if you have questions or need more information.
      
                                     
Bill Wehrum        
Partner            
wwehrum@hunton.com 
Hunton & Williams LLP                
                  
1900 K Street, N.W.    
Washington, DC 20006              
Phone: (202) 955-1637           
Fax: (202) 778-7417
www.hunton.com