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Modeling Challenges Case Study

Modeling Challenges Case Study. John Glass SC Bureau of Air Quality. Background Information. New Ceramic Poppant Facility 250 tpy category Project Emissions: PM 10 : 317.3 tpy PM 2.5 : 213.1 SO 2 : 205.5 NO x : 683.7 CO : 1226.1

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Modeling Challenges Case Study

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  1. Modeling Challenges Case Study John Glass SC Bureau of Air Quality

  2. Background Information • New Ceramic Poppant Facility • 250 tpy category • Project Emissions: • PM10 : 317.3 tpy • PM2.5 : 213.1 • SO2 : 205.5 • NOx : 683.7 • CO : 1226.1 • VOCs : 250.5 • Fluorides: 0.4

  3. Background (cont.) • Location: Rural Allendale County, SC • Flat Terrain • SC/GA state line approximately 18 km • Other major facilities close by • Lumber Mill: • 141 tpy PM10, 82 tpy PM2.5, 257 tpy NOx • approx. 2 km SE • OSB Mill: • 600 tpy PM10/ PM2.5, 247 tpy SO2, 847 tpy NOx • approx. 11 km SE

  4. Modeling Details • Class I AQRV • Screened out using Q/D ≤ 10 • Class I Significant Impact • All but PM2.5 screened out using AERMOD at 50 km

  5. Modeling Details • Class II Significant Impact: • PM10: 24-hr - 2.04 km SIA, Annual - 1.5 km SIA • PM2.5: 24-hr - 3.8 km SIA, Annual - 2.2 km SIA • SO2: 1-hr - 2.2 km SIA • NO2: 1-hr - 12.9 km SIA, Annual - 12.9 SIA • Above SMC for PM10 and PM2.5 • Existing state data approved for background concentrations

  6. Modeling Details • Class I Full Impact Inventory • Only 1 other PM2.5 increment consuming facility • Class II Full Impact Inventory • Used 20D to screen background sources • Final inventory included: • Nearby major facilities (2 and 11 km SE) • Coal-fired power plant (5,506 tpy NOx) located approx. 46 km NE • Major coal-fired boilers on SRS (19,300 tpy SO2) located approx. 42 km NW

  7. Modeling Results • Full Impact Class I passed using 50 km results • Full Impact NAAQS • Passed NO2 Annual • Possible exceedances of several NAAQS • 24-hr PM10 • 24-hr and Annual PM2.5 • 1-hr SO2 • 1-hr NO2 • Full Impact Class II Increments • All pollutants passed easily

  8. NAAQS Modeling Results

  9. Exceedance Analysis • Facility ran AERMOD Maxi Event Files for exceedances • Event files indicated project facility not significant at any exceeding ambient receptor • Project facility passes modeling • Permit put on public notice • SC BAQ initiates investigation of exceedances

  10. PM10 24-Hr Results

  11. PM2.5 Annual Results

  12. PM2.5 24-Hr Results

  13. SO2 1-Hr Results

  14. NO2 1-Hr Results

  15. NO2 1-Hr Results

  16. Exceedance Analysis • SC BAQ performed more detailed investigation of sources causing exceedances • PM10 exceedances not in ambient air • PM2.5 ambient air exceedances caused by use of PM10 emissions • SO2 1-hr exceedances caused by double counting SRS emissions • NO2 1-hr ambient air exceedances caused by double counting OSB emissions

  17. Public Comments • Comments concerning zoning, noise, odor, disposal of dust from baghouse, etc. • Comments on BACT • Comments on predicted exceedances • Comments on omission of sources in GA • 8 Georgia sources had screened out • 1 proposed facility was erroneously left out of NO2 1-hr modeling • Facility submitted revised modeling

  18. Lessons Learned • Long Run Times • Glitches in MAX AERMOD • Consultants don’t read details of inventories • Lack of background data for 1-hr modeling • Consultants will leave you holding the bag • Check with neighboring states early if state line within screening area • Review takes a lot of time and resources

  19. Questions? John Glass 803-898-4074 glassjp@dhec.sc.gov

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