1. 1 Gorge EI Analysis  Domain-wide analysis  In response to concerns over EI data integrity  A QA step  Comparison by source type and pollutant * On-Road VOC = Exhaust + Evaporative * Biogenic VOC = OVOC + ISOP + TERP * On-Road PM25 = Brake + Exhaust + Tire * SOX includes SO2, but no double-count  Source type is EPA convention: SCC * Area source type includes wildfires  Small issues

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5. 5 SCC 1-01-002-22: External Combustion Boilers- Electric Generation- Bituminous/Subbituminous Coal-Pulverized Coal: Dry Bottom (Subbituminous Coal). Boardman shut down on November 10, 2004. However, the emissions for 1-01-002-22 show up for 10-Nov-2018 due to temporalizing of the annual emissions.

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7. 7 Tons Per Day CONOXVOCSO2PM10PM25PMC August 2018 Colville Reservation2.370.670.240.090.840 Umatilla Reservation00000.0190.0030.015 Yakima Nation0.390.180.520.040.350 ------- Total2.760.840.760.131.200.0031.20 November 2018 Colville Reservation2.370.670.240.090.840 Umatilla Reservation00000.0190.0030.015 Yakima Nation0.390.180.530.040.350 ------- Total2.760.840.760.131.200.0031.20 Small issues: Locations present in the 2018 episodes but not the 2004 episodes

8. 8 Small Issues continued  2004 Episodes: Nonroad Double-Count * General + Specific Categories Example: SCC 22-65-004-000 (4-stroke lawn & garden equipment, all) + specific 4-stroke lawn & garden categories * Avg. of 1% for NOX, PM25, VOC, NH3, SOX for domain, both 2004 episodes  2004 Episodes: On-Road PM25 Double-Count * Total PM25 + (Brake PM25 + Tire PM25 + Exhaust PM25) * Approximately 3% of 2004 episode domain PM25  All Episodes: Residential Wood Combustion Double-Count * SCC 21-04-008-000 (total: woodstoves & fireplaces) + specific RWC categories * Adds <1 ton per day of any pollutant in the EI