BART Visibility Modeling:BART Visibility Modeling:Oregon Single Source ResultsOregon Single Source Results

andandCumulative AssessmentCumulative Assessment

October 22, 2007October 22, 2007EPA Region 10EPA Region 10

SeattleSeattle

BART Eligible Sources: OregonBART Eligible Sources: Oregon

BART Exemption Modeling: Oregon Results (subject to change)22 Best day per three year period (2003-2005)

PGE Amalgamated Weyer SP GP Pope & GP PGE BoiseClass I Area Boardman Sugar Springfield Kingsford Newsprint Toledo Talbot Wauna Beaver Paper

Alpine Lakes 2.465 0.037 0.159Columbia Gorge 4.184 0.436 0.014 0.166 0.114 0.221 0.478Crater Lake 0.019 0.036 0.107 0.199Craters of the Moon 0.049 0.802Diamond Peak 1.162 1.002 0.03 0.061 0.125 0.247 0.115Eagle Cap 2.538 0.457Gearhardt Mt 0.224 0.005 0.076Glacier Peak 1.684 0.097Goat Rocks 2.581 0.249 0.006 0.052 0.064 0.114 0.190 0.254 0.177Hells Canyon 2.221 0.295Jarbridge 0.062Kalmiopsis 0.731 0.023 0.190 0.304Lava Beds 0.298 0.006Marble Mt 0.568 0.012 0.172Mt Adams 2.966 0.296 0.009 0.062 0.083 0.133 0.190 0.239 0.192Mt Hood 5.194 0.656 0.02 0.125 0.156 0.299 0.291 0.346 0.367Mt Jefferson 3.228 0.855 0.028 0.092 0.143 0.296 0.234Mountain Lakes 0.455 0.011 0.080 0.137Mt Rainier 2.423 0.238 0.007 0.061 0.083 0.095 0.274 0.375 0.246Mt Washington 2.522 0.981 0.032 0.075 0.136 0.303 0.172North Cascades 1.208Olympic NP 0.058 0.369 0.400 0.224Redwood 0.676 0.016 0.243Sawtooth 0.081Selway-Bitteroot 0.086Strawberry Peak 1.784 0.365Three Sisters 2.622 1.457 0.049 0.091 0.163 0.396 0.185

Max dv 5.194 0.457 1.457 0.049 0.166 0.190 0.396 0.369 0.400 0.367

8th Best day per single year

Eagle Cap 0.514Hells Canyon 0.407Mt HoodMt JeffersonMt Rainier 0.372 0.408Mt WasshingtonOlympic NP 0.446 0.464Strawberry Peak 0.451Three Sisters

BART:BART:Lower Columbia single source model resultsLower Columbia single source model results

22 Best day per three year period (2003-2005)

OR OR OR WA WA WA WAGP PGE Boise GP Weyco Longview Trans

Class I Area Wauna Beaver Paper Camus Longview Fibre AltaGoat Rocks 0.190 0.254 0.177 0.096Mt Adams 0.190 0.239 0.192 0.122Mt Hood 0.291 0.346 0.367 0.373Mt Rainier 0.274 0.375 0.246 0.091Olympic NP 0.369 0.400 0.224 0.070

Max dv 0.369 0.400 0.367 0.373

BART Cumulative Analysis:BART Cumulative Analysis:ThreeThree--state BART Modeling Protocolstate BART Modeling Protocol

[I]f multiple BART-eligible sources impact a given Class I area on the same day, then a lower, individual, contribution threshold may be considered.

For BART-eligible sources in Oregon and Washington, the following steps will be used to address this condition:

1) after all BART-eligible sources have completed their individual BART exemption modeling, the modeled visibility impairment from all sources will be aggregated for each Class I area receptor for each day.

2) if the total for any receptor exceeds 0.5 deciview, all sources responsible for visibility impairment at that receptor for that day will be considered for further evaluation.

BART:BART:LowerLowerColumbiaColumbiaCumulativeCumulativeSourcesSources

BART Cumulative Impacts: Mixture of PTE and Actual EmissionsBART Cumulative Impacts: Mixture of PTE and Actual Emissions

BART: All Oregon Sources (Initial Actual Emissions)BART: All Oregon Sources (Initial Actual Emissions)

BART:BART:All OregonAll OregonSourcesSources(Initial Actual(Initial ActualEmissions)Emissions)

BART:BART:All OregonAll OregonSourcesSources(Initial Actual(Initial ActualEmissions)Emissions)

Cumulative Assessment with Single Source ModelingCumulative Assessment with Single Source Modeling

1)1) PostPost--process single source delvis.dat files for eachprocess single source delvis.dat files for eachClass I areaClass I area

2) Assumes all modeling under same Protocol2) Assumes all modeling under same Protocol

Consistent wind fieldsConsistent wind fieldsIdentical Class I receptors (NPS default)Identical Class I receptors (NPS default)Sufficient NH3 in background (not NH3 limited)Sufficient NH3 in background (not NH3 limited)Use of ozone.dat file or default O3 backgroundUse of ozone.dat file or default O3 background

3) Allows for individual source attribution of total impacts3) Allows for individual source attribution of total impacts

BART Cumulative Analysis: Lower Columbia(process repeated for each Class I Area)

…Source _Receptors_

Wauna 1 2 3 … nPGE 1 2 3 … nBoise 1 2 3 … nCamus 1 2 3 … n...

Total 1t 2t 3t .nt

Day 1

Max Receptor Day 1

Day 1095Day 2 Day 3Source _Receptors_

Wauna 1 2 3 … nPGE 1 2 3 … nBoise 1 2 3 … nCamus 1 2 3 … n...

Total 1t 2t 3t .nt

Source _Receptors_

Wauna 1 2 3 … nPGE 1 2 3 … nBoise 1 2 3 … nCamus 1 2 3 … n...

Total 1t 2t 3t .nt

Source _Receptors_

Wauna 1 2 3 … nPGE 1 2 3 … nBoise 1 2 3 … nCamus 1 2 3 … n...

Total 1t 2t 3t .nt

…

Max Receptor Day 2

Max Receptor Day 3

Max Receptor Day 1095…

Sort in descending order: Highlight 22nd day

Class I Area delvis.dat files

MS Access

Lower Columbia SourcesLower Columbia Sources: : Initial cumulative resultsInitial cumulative results

BART Cumulative impacts from Lower Columbia sources (2003-2005)

2003-200598th %tile OR OR OR WA WA WA WA(22nd day) GP PGE Boise GP Longview Weyerhaeuser TransAlta

Class I Area delta dv Year Julian Wauna Beaver Paper Camus Fibre Longview Centralia

Olympic NP 0.883 2005 345 37.5% 38.0% 19.1% 5.4% ? ? ?Mt Rainier 0.747 2004 121 31.8% 42.6% 19.7% 5.9% ? ? ?Goat Rocks 0.494 2004 107 29.1% 45.3% 20.1% 5.5% ? ? ?Mt Adams 0.538 2005 76 24.8% 34.5% 33.7% 7.0% ? ? ?Mt Hood 1.186 2003 161 20.2% 26.9% 27.2% 25.7% ? ? ?

Average contibution over highest 22 days

Cumulative impacts at Class I areasCumulative impacts at Class I areas