# Agenda • Introductions • Objectives • RP 

# Goals in Montana • BART 

# for Colstrip Units 

# 1 

# & 2 • Next Steps

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# Objectives • Convey Colstrip Owners' View

- Recent Colstrip reductions are significant for long term strategy in first RP implementation period (through 2018)

- Other near-term air pollution control programs achieve further visibility improvements

- Units 1 & 

# 2 

# • Reach Common Understandings

- EPA's Obligations and Analysis

- Reasoned, long-term plan to achieve RP goals

- Colstrip's portion of Montana Regional Haze FIP

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# pp**.~~~ :**  " ,RRF Calculation Method Selection of Days Help 

## I Parameter Group 

### Best 20% IMPROVE S ec i fic Da s EPA) Mass Quarterly Weighted Monthly Weighted Worst 20% IMPROVE Li ght Extinction Annual Data 

### Particle Extinction Parameter



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### Deciview 2008 Sulfate Extinction 2007 Nitrate Extinction 2006 Particulate Organic Carbon Extinction 2005 Elemental Carbon Extinction 2004 Soil Extinction 2003 Coarse Mass Extinction 2002 SeaSalt Extinction 2001 2000 Visibility modeling results from the Plan02d regional scenario for 9 WRAP region IMPROVE regional haze tracking sites, and the 15 W areas represented by these 9 sites, as well as 1 WRAP region Class II area site, and 3 non-WRAP region sites were incorrectly extra( adjacent to the grid cell containing the IMPROVE samplers. This was corrected in a revised version o f the model scenario results, Pia 2011. The emissions data for Plan02d were correct and have not been revised. Open this document f o r additional details .

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## I prp18b ULBE1 2000 15.14 ULBE1 2001 15.14 ULBE1 2002 15 . 14 ULBE1 2003 15 . 14 ULBE1 2004 15.14 15.14 ULBE1 2005 15 . 02 14 . 86 ULBE1 2006 14 . 90 14.86 ULBE1 2007 14.79 14.86 ULBE1 2008 14.67 14.86 ULBE1 2009 14.55 14.86 ULBE1 2013 14.09 ULBE1 2018 13.51 14.85 ULBE1 2023 12 . 93 ULBE1 2028 12.34 ULBE1 2033 11.76 ULBE1 2038 11.18 ULBE1 2043 10 . 60 ULBE1 2048 10 . 02

## Regional Contributions to Sulfate on Worst 20% Visibility Oays UL Bend NWRW, MT Class I area
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## Regional Contributions to Nitrate on Worst 20% Visibility Days UL Bend NWRW, MT Class I area



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