V:\corporate\marketing\overview.ppt CRGAQS: Revised CAMx 2004 Results Presentation to the Gorge Study Technical Team By ENVIRON International Corporation May 2, 2007

V:\corporate\marketing\overview.ppt Today’s Presentation Describe OR/WA emission changes Describe November 2004 met changes Revised 2004 CAMx simulation results Next Steps

V:\corporate\marketing\overview.ppt Additional WA Funding 2004 and 2018 emission improvements 2004 November meteorological improvements Rerun CAMx –2004 Base Case, August and November episodes –2018 Future Case, August and November episodes –2018 “What-if” scenarios –2004 and 2018 PSAT runs, both episodes

V:\corporate\marketing\overview.ppt OR/WA Emission Changes Reviewed/changed ammonia emissions: –All CAFOs increased: x1.2 for OR, x1.4 for WA –Three Mile Canyon near Boardman increased x4.3 head count and “flush” operations identified –Certain fertilizer application types increased x3.3 for anhydrous and aqueous x2.7 for nitrogen solution –Checked monthly fertilizer allocation by state (but not changed) –No 2018 WRAP ammonia – WRAP used 2002 numbers for 2018 We used 2002 WRAP outside OR/WA for 2018 We used 2004 OR/WA for 2018

V:\corporate\marketing\overview.ppt OR/WA Emission Changes Reviewed/changed residential wood combustion: –ODEQ revealed x2 over estimate from surveys –WRAP 2018 RWC indicates x7 growth for OR, x3 growth for WA, from our 2004 RWC –WRAP emissions contractor (ERG) stated a 4% growth (population-based) –We reduced 2004 RWC by 50% and grew by 4% for 2018 –Monthly profiles differ in 2004 from 2018 (but not changed)

V:\corporate\marketing\overview.ppt OR/WA Emission Changes Reviewed wind-blown dust methodology –Found some minor issues, but did not change given very small component of overall PM

V:\corporate\marketing\overview.ppt November Met Changes Background –August is performing OK, but November lacks secondary aerosols Lack of fog reduces aqueous SO4 production Low humidity reduces NO3 condensation Hypothesis: If we can get the fog right, –Aqueous SO4 production can occur –High humidity will help increase condensation of ammonium nitrate

V:\corporate\marketing\overview.ppt November Met Changes Approach 1)Gather satellite imagery for the period (provided by Paul) 2)Calculate MM5 average fog water content occurring over the episode -- use as the default water content to fill in the fog “holes” 3)Evaluate imagery against CAMx cloud plots to identify onset of fog and spatial extent – use terrain fields to define valleys and basins where the fog consistently forms and lingers 4)Use results from (2) and (3) to fill in fog in CAMx cloud field 5)Modify CAMx chemistry routine to ensure that relative humidity is 100% for a cloudy grid cell

V:\corporate\marketing\overview.ppt August 2004 Results

V:\corporate\marketing\overview.ppt August 2004 Results

V:\corporate\marketing\overview.ppt August 2004 Results

V:\corporate\marketing\overview.ppt August 2004 Results

V:\corporate\marketing\overview.ppt August 2004 Results

V:\corporate\marketing\overview.ppt August 2004 Results

V:\corporate\marketing\overview.ppt August 2004 Results

V:\corporate\marketing\overview.ppt November 2004 Results

V:\corporate\marketing\overview.ppt November 2004 Results

V:\corporate\marketing\overview.ppt November 2004 Results

V:\corporate\marketing\overview.ppt November 2004 Results

V:\corporate\marketing\overview.ppt November 2004 Results

V:\corporate\marketing\overview.ppt November 2004 Results

V:\corporate\marketing\overview.ppt November 2004 Results

V:\corporate\marketing\overview.ppt November 2004 Results

V:\corporate\marketing\overview.ppt Next Steps 2018 runs are “in the oven” 2018 “what-if” scenarios are about to start 2004/18 PSAT runs will start after these are completed Complete technical report