Laura Boothe Attainment Planning Branch Supervisor January 11, 2012

 Used EPA’s modeling files  2005 mercury air emission files  2005 meteorology files  EPA’s version of the Community Multiscale Air Quality (CMAQ) model used for mercury deposition modeling  Zeroed out North Carolina’s mercury air emissions to understand the impact of North Carolina’s air emission sources on North Carolina  Ran model with clean boundary conditions to understand impact of the global air emissions on North Carolina

Based on EPA’s 2005 Data

 Zero out run indicated ~16% of the mercury deposition in North Carolina is coming from air emission sources in North Carolina  Clean boundary conditions indicate that 70% of the mercury deposition in North Carolina comes from outside of the 12-km modeling domain

Source Type 2002 lbs/year 2010 lbs/year 2016* lbs/year Reduction Electric Generating 3, % Other Point 1, % Total 5,3001,8441,50072% *2016 projected emission include EPA’s proposed Electric Generating Units and Boiler Maximum Achievable Control Technology (MACT) Rules and planned shutdowns/fuel conversions

 DWQ is developing a Mercury Total Maximum Daily Load (TMDL) for North Carolina based in part on air quality modeling  January 2012  Final draft TMDL completed  Draft Implementation  February 2012  Final draft TMDL available to public  Request feedback  March 2012  EMC informational item  Stakeholder meetings