1. 1 Tracer Experiments Barrio Logan Working Draft Do Not Cite or Quote Tony Servin, P.E. Shuming Du, Ph.D. Vlad Isakov, Ph.D. September 12, 2002 Air Resources Board California Environmental Protection Agency

2. 2 General Location Working Draft - Do Not Cite or Quote Lindbergh Field North Island Shipping Lane Logan Memorial

3. 3 Tracer Experiment Purpose Develop a source-receptor relationship database Evaluate dispersion models for community health modeling Provide a recommendation for community health models and model options Working Draft - Do Not Cite or Quote

4. 4 The Experiment SF6 tracer release (Summer & Winter) –August 2001 –December 2001 43 to 50 fixed sampling sites One mobile van continuous sampling Meteorological measurements –At the source –In receptor field Contract w/ UC Riverside Working Draft - Do Not Cite or Quote

5. 5 Tracer SF6 Release (1/2) UCR Student verifying SF6 flow Continuous Release: 7am to 8 pm Draft

6. 6 Tracer SF6 Release (2/2) SF6 released 5m above ground from PVC pipe Draft

7. 7 SF6 Release Rate Summer (August 2001) SF6 released 9am to 8pm 8/29 released from 3pm to 2am Draft

8. 8 SF6 Release Rate Winter (December 2001) SF6 released 7am to 8pm Draft

9. 9 Fixed Bag Sampler, Residence Hourly SF6 sampling at 43 sites 10 am to 6 pm Draft

10. 10 Tracer Release, NASSCO Logan Memorial Barrio Logan Source & Receptors August, 2001 Draft

11. 11 Barrio Logan Source & Receptors December, 2001 Logan Memorial Tracer Release Draft

12. 12 Mobile Sampler Continuous SF6 sampling Draft

13. 13 Barrio Logan Source & Mobile Van Route, August 2001 Yellow dots - fixed samplers Black lines - mobile van path Draft

14. 14 Vertical Array of Sonic Anemometers Logan Memorial Jr. High Surface winds and turbulence Draft

15. 15 Mini-SODAR (Logan Memorial) Vertical profile of winds –u, WD, S u, S v, S w –range: 15m to 200m –layer resolution: 5m Draft

16. 16 Sonic Anemometer Sonic anemometer at release site Surface winds and turbulence Draft

17. 17 Summer sampling period (10 am to 8pm) NASSCO Wind Roses Draft Summer sampling period (3pm to midnight) Winter sampling period (10am to 6pm)

18. 18 Observed SF6 (ppt) Dec. 19, 2001 (1pm) Draft

19. 19 Observed SF6 (ppt) Dec. 17, 2001 (3pm) Draft

20. 20 Predicted vs Observed (AERMOD - Winter) SF6, Paired Hourly Data Draft

21. 21 Barrio Logan Terrain Features (Calpuff) Draft

22. 22 Working Draft - Do Not Cite or Quote CALMET Winds, December 17, 2001 (5pm)

23. 23 CALPUFF Predictions, December 17, 2001 (5pm) Working Draft - Do Not Cite or Quote

24. 24 Predicted vs Observed (CALPUFF - Winter) SF6, Paired Hourly Data Working Draft - Do Not Cite or Quote

25. 25 Micro-scale modeling may not adequately simulate dispersion in complex urban environments on a one- for-one hourly basis Tracer data may need further QA –e.g., 10 hours of 32 hours of winter measurements show the peak concentration higher at 2 km from source rather than 1 km from source. Working Draft - Do Not Cite or Quote Possible Reasons for Scatter in Data

26. 26 Screening of Tracer Data Need to screen observed data Suggested criteria for screening –Observation near limit of detection or saturation –Siting and exposure criteria for each sampler –Equipment maintenance history –Potential of tampering by curious public or domestic animals Working Draft - Do Not Cite or Quote

27. 27 Tracer Experiment Summary Develop a source-receptor relationship database –Screen and stratify data Evaluate dispersion models for community health modeling Provide a recommendation for community health models and model options Working Draft - Do Not Cite or Quote

28. 28 Future Work Screen and stratify tracer data Screen and stratify meteorological data for consistency with plume centerline observations Recommend model and model options for microscale modeling for community health Working Draft - Do Not Cite or Quote