September 27, 2010

MEMORANDUM

SUBJECT:	Placement of Electronic Data Set in Docket 

FROM:	Office of Atmospheric Programs

TO:		Public Docket EPA-HQ-OAR-2009-0491

This memorandum provides a contextual background on an electronic data
set EPA placed in the docket.  

EPA received a request for certain electronic data sets that were used
as inputs for a specific run of the air quality assessment tool (AQAT). 
The particular AQAT run for which the inputs were requested was not
relied upon by EPA in developing the proposed Transport Rule. 
Nonetheless, because EPA received a specific request for the data, EPA
added these data sets to the docket.  

These data sets contain state total projected electric generating unit
(EGU) emissions for the proposed State Budgets/Limited Trading remedy in
2014 and 2012.  For 2014, for states that are proposed to be included in
the rule, these emission estimates also can be found in section V.E in
the preamble.  As noted above, these data, and the AQAT runs with which
they are associated, were not used to determine states’ significant
contribution or interference with maintenance.  For evaluation of the
air quality impacts of the projected EGU emissions under the proposed
remedy in 2014 and 2012 we refer interested parties to the CAMx modeling
of the limited trading remedy.

