
 From:
"William J. Mills" <wmills@mills-consulting.com>
 To:
Keith Barnett/RTP/USEPA/US@EPA
 Cc:
"'Hector.Ybanez@holcim.com'" <Hector.Ybanez@holcim.com>, Kyle Hilst <khilst@mills-consulting.com>, Uyen Nguyen <unguyen@mills-consulting.com>, Ben Grigg <bgrigg@mills-consulting.com>
 Date:
07/27/2009 10:52 PM
 Subject:
FW: questions regarding proposed PC NESHAP


Keith,
thanks for the emails last week . as you requested/suggested , here are the extracts from the OAR Background document for the PC NESHAP and the referenced HWC MACT technical document  with our questioned equations outlined.  Mills Consulting Inc. questions are not about whether Vt=Vb+Vw  is a vailid approach but rather what equations  are used to calculate Vt and Vb.    If EPA could shed some light on the technical basis, including literature references for the highlighted equations it would be useful to all parties.
 
please let me know if there are any questions. 
regards,
bill mills
 
William J. Mills III
Ph.D., M.Sc., CIH, C. Chem.
President 
Mills Consulting Inc.
Oak Park, IL
phone : (708) 524-2166
wmills@mills-consulting.com
www.mills-consulting.com
 

