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Solution to AERMOD/PRIME
Overpredictions for Extremely
Short, Long, and Wide Buildings
Guideline on Air Quality Models: The Changes
Chapel Hill, NC
Sergio A. Guerra, Ron Petersen; CPP Inc.
Steve Nelson; Coal Creek Environmental
John S. Kirkpatrick; Basic American Foods
November 15, 2017
COAL CREEK ENVIRONMENTAL
ASSOCIATES
BAF Customers
Basic American Foods (BAF)
Overview
• Family owned and operated since 1933
– Ongoing innovation (40+ patents)
– Shelf-stable potatoes and beans
• Food Service
• Limited Retail – Hungry Jack
• Facility Locations
– Idaho
• Blackfoot
• Shelley
• Rexburg
– Washington
• Moses Lake
BAF Blackfoot Facility
BAF Blackfoot Facility
Baseline Case (with BPIP values)
Permitting and Modeling Challenges
• BAF is updating a PM10 compliance demonstration
• No clear path to show needed reductions in PM10 impacts
(needed 80% reduc8ons in impacts)
̵ Modeling op8ons exhausted
̵ No apparent treatment options (most of the PM10 is non-filterable
material)
̵ Stack height increases unfeasible
• Wind tunnel analysis of downwash appeared promising
BPIPPRM Derived Values
Flow Wind BUILDHGT BUILDWID BUILDLEN
Vector Direction Hb W L Hs/Hb W/Hb L/Hb
(Deg.) (Deg.) (m) (m) (m)
10 190 7.92 61.66 35.92 2.1 7.8 4.5
20 200 7.92 62.29 44.07 2.1 7.9 5.6
180 360 7.92 59.22 26.93 2.1 7.5 3.4
StackEU_13BPIP DimensionsDiagnostic
Aspect Ratio
Downwash Screening – Stack CXX
Downwash Screening – Stack EU_15
Equivalent Building Dimension
Method for Downwash
Model Design and Construction
• Obtain source/site data
• Specify test wind speeds and directions
• Compute model operating conditions
• Construct scale model
Phase 1 Testing: Flakers
Phase 2 Testing: Dehydrators
Measure Ground-level Concentrations
Data taken until good fit and max obtained Automated Max GL Concentration Mapper
Identify Wind Tunnel Determined
EBD that Match Dispersion with Site
Structures Present
Sample Result Plot
Baseline Case (with BPIP values)
WT EBD values for Flakers and Dehys
Max PM10 H6H = 82 ug/m3
Dehy
area
Flaker area
Solution to AERMOD/PRIME PM10 Overpredictions for Extremely Short, Long and Wide Buildings
Solution to AERMOD/PRIME PM10 Overpredictions for Extremely Short, Long and Wide Buildings
Conclusions
• EPA provided technical assistance to IDEQ in reviewing
the EBD study
• IDEQ has accepted the results of the EBD study
• BAF has resubmitted the Alternate Compliance Plan
using the EBD study results
• This study demonstrated the applicability of EBD
method to shorter buildings and stacks
• Case study provides an opportunity to revisit the use of
wind tunnel testing for regulatory purposes
Questions?

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Solution to AERMOD/PRIME PM10 Overpredictions for Extremely Short, Long and Wide Buildings

  • 1. Solution to AERMOD/PRIME Overpredictions for Extremely Short, Long, and Wide Buildings Guideline on Air Quality Models: The Changes Chapel Hill, NC Sergio A. Guerra, Ron Petersen; CPP Inc. Steve Nelson; Coal Creek Environmental John S. Kirkpatrick; Basic American Foods November 15, 2017 COAL CREEK ENVIRONMENTAL ASSOCIATES
  • 3. Basic American Foods (BAF) Overview • Family owned and operated since 1933 – Ongoing innovation (40+ patents) – Shelf-stable potatoes and beans • Food Service • Limited Retail – Hungry Jack • Facility Locations – Idaho • Blackfoot • Shelley • Rexburg – Washington • Moses Lake
  • 6. Baseline Case (with BPIP values)
  • 7. Permitting and Modeling Challenges • BAF is updating a PM10 compliance demonstration • No clear path to show needed reductions in PM10 impacts (needed 80% reduc8ons in impacts) ̵ Modeling op8ons exhausted ̵ No apparent treatment options (most of the PM10 is non-filterable material) ̵ Stack height increases unfeasible • Wind tunnel analysis of downwash appeared promising
  • 8. BPIPPRM Derived Values Flow Wind BUILDHGT BUILDWID BUILDLEN Vector Direction Hb W L Hs/Hb W/Hb L/Hb (Deg.) (Deg.) (m) (m) (m) 10 190 7.92 61.66 35.92 2.1 7.8 4.5 20 200 7.92 62.29 44.07 2.1 7.9 5.6 180 360 7.92 59.22 26.93 2.1 7.5 3.4 StackEU_13BPIP DimensionsDiagnostic Aspect Ratio
  • 10. Downwash Screening – Stack EU_15
  • 12. Model Design and Construction • Obtain source/site data • Specify test wind speeds and directions • Compute model operating conditions • Construct scale model
  • 13. Phase 1 Testing: Flakers
  • 14. Phase 2 Testing: Dehydrators
  • 15. Measure Ground-level Concentrations Data taken until good fit and max obtained Automated Max GL Concentration Mapper
  • 16. Identify Wind Tunnel Determined EBD that Match Dispersion with Site Structures Present
  • 18. Baseline Case (with BPIP values)
  • 19. WT EBD values for Flakers and Dehys Max PM10 H6H = 82 ug/m3
  • 23. Conclusions • EPA provided technical assistance to IDEQ in reviewing the EBD study • IDEQ has accepted the results of the EBD study • BAF has resubmitted the Alternate Compliance Plan using the EBD study results • This study demonstrated the applicability of EBD method to shorter buildings and stacks • Case study provides an opportunity to revisit the use of wind tunnel testing for regulatory purposes