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Introduction to Atlantic RBCA Version 3

Join us for an in-depth session on Atlantic RBCA Version 3. Explore incorporating lab results, modeling various pathways, adjusting parameters, and best practices for running different pathways. Review case studies and relevant parameters for indoor air pathways. Get insights on AF=10 requirements, crack fraction adjustments, and estimating dispersivity. Enhance your understanding of the ARBCA toolkit and regulatory processes. Share your thoughts and suggestions during this informative webinar.

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Introduction to Atlantic RBCA Version 3

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  1. Introduction to Atlantic RBCA Version 3 Webinar May 4, 2013

  2. Attending Today’s Session • Hosting • Tania Noble, Stantec • Michel Poirier, NBENV • Ulysses Klee, Stantec • You – People who have taken the on-line course

  3. Outline • Quick Navigation (Webinar) • Questions asked during course or submitted for the webinar • Reminder of topics/other questions on theory • Review Case Studies from course

  4. Q1 – Incorporating lab results

  5. Q1 – Incorporating lab results

  6. Q2 –Modeling different pathways

  7. Q2 –Modeling different pathways

  8. Q2 –Modeling different pathways

  9. Q2 –Modeling different pathways

  10. Q2 –Modeling different pathways • Best Practice: • Run each pathway separately • Indoor Air (x 10) • Dermal Contact and Soil Ingestion • Groundwater Ingestion • Run TEX separately from TPH Might seem like a lot of runs for some sites, but it will greatly reduce the chance of error

  11. Q3 – Minimum Requirements for AF=10? • Same as basic requirements for using model • Concrete floor • 30 cm clean soil separation • Can still adjust other building parameters as usual and apply AF=10 for BTEX/TPH

  12. Q4 – How can you adjust crack fraction? • Crack fraction = Acracks/Abldg • Default crack fraction assumes: • Perimeter crack only • From CWS: crack width = 0.2 cm for residential, = 0.26 cm for commercial • For all other openings, note dimensions, calculate area, and add to perimeter crack

  13. Q5 – Adjust for dirt floor (internal purposes only) • Technically: Adjust the crack fraction to 1.0 • Note: Once you go beyond the range of “typical” values (0.0001 to 0.01), model may become unstable, and results may become very sensitive to other parameters

  14. Q6 – Relevant Parameters for Indoor Air Pathway • Does depth to contamination matter? • Depends. If diffusion through soil to foundation is dominant process, yes • If advection dominates, then SSTL is not sensitive to depth to contamination

  15. Q6 – Relevant Parameters for Indoor Air Pathway • Does area of contamination matter? • Area of impact on soil input parameters does not affect SSTL for indoor air pathway • Account for soil area through volume to area ratio

  16. Q7 – Equation for estimating dispersivity • Xu and Eckstien equation is recommended over ASTM

  17. Q8 – What if you don’t know the wind direction? • For air dispersion model, if you don’t know wind direction, assume receptor is directly downwind • Similar recommendation for groundwater dispersion if you are uncertain about groundwater direction

  18. Reminder of the Topics • M1 – Introduction • M2 – Overview • M3 – RA Fundamentals • M4 – Evaluating Exposure Pathways • M5 – Fate and Transport • M6 – ARBCA Model Issues • M7 – Model Sensitivity • M8 – Navigating the ARBCA Toolkit • M9 – Version 2 User Guidance • M10 – Soil Vapour & IA Monitors • M11 – Atlantic Regulatory Process • M12 – Final Test

  19. Case Study #1

  20. Case Study #1 • Provided only 1 soil sample and 2 MW samples & table of site-specific conditions • Assumptions: • Full site characterization has been completed • Building has no major openings in concrete floor and is at least 2 levels

  21. Case Study #1

  22. Case Study #2

  23. Case Study #2 • Provided limited sample results; no info on surrounding land use • Assumptions: • Full site characterization has been completed • Building has no major openings in concrete floor • Surrounding land use is commercial • Mixed use on-site – residential most conservative

  24. Case Study #2 – Gas/Diesel

  25. Case Study #2 – Weathered Diesel

  26. Case Study #3

  27. Case Study #3 • Original report and assessment dates back prior to 2003 • Did you pick up on changes between how report was RBCA was used then, versus how you did it now? • How did you address: • Vapour screening? • Bedrock • Off-site wells?

  28. Case Study #3 • What assumptions did you have to make? • What other information would you have liked to have? • Based on your assessment, does this site require further mediation or risk management?

  29. Suggestions or comments

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