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CLARK COUNTY RESEARCH UPDATE

CLARK COUNTY RESEARCH UPDATE. PM 10 Emissions Studies Presentation to Air Quality Forum May 10, 2005. PM 10 Emissions Studies. Paved Road Emissions –Alternative Technologies Native Desert Emissions Factor. PAVED ROAD EMISSIONS. Components of Study Sampling route Field sampling

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CLARK COUNTY RESEARCH UPDATE

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  1. CLARK COUNTYRESEARCH UPDATE PM10 Emissions Studies Presentation to Air Quality Forum May 10, 2005

  2. PM10 Emissions Studies • Paved Road Emissions –Alternative Technologies • Native Desert Emissions Factor

  3. PAVED ROAD EMISSIONS • Components of Study • Sampling route • Field sampling • Next steps

  4. COMPONENTS OF STUDY • Mobile Systems (SCAMPER and TRAKER) • AP-42 Silt Sampling • QA/QC Of Basic Sampling Instruments • Data Analysis & Comparison

  5. SCAMPER

  6. SCAMPER

  7. TRAKER • Particle Sensors • TSI DustTrak 5820 • Grimm Particle Size Analyzer 1.108 • GPS

  8. AP-42 SAMPLING • Contracted With UNLV – CEE • Sampled 24 Sites • 10 Sites Previously Sampled By Clark County • 14 New Sites • Will Compare AP-42 Results To Mobile Sampling Systems

  9. UNLV AP-42 SAMPLING METHOD

  10. COMPONENTS OF STUDY (Continued) • Data Analysis and Comparison • CONDUCTED BY UNLV – Dr. Teng • Provides 3rd Party Assessment • Analysis Of Data From 2 Mobile Systems, A-42 Silt Results, & Other Factors • QA/QC Looked At Operation Of Basic Sampling Instruments

  11. SAMPLING ROUTE Route Included 5 Classes Of Roads • Freeway • Major Arterial • Minor Arterial • Collector • Local

  12. SAMPLING ROUTE • Segments Of Each Road Class Within The Cities Of Las Vegas, North Las Vegas, Henderson, & Unincorporated Clark County • Include Road Segments With AP­42 Silt Sampling History

  13. NEXT STEPS • Phase III Study – Development Of Refined Emissions Inventory For PM10 Maintenance Plan • New Study – Characterize Paved Road Silt Reservoir Depletion For Projecting Future Emissions

  14. Questions? Please contact: Department of Air Quality and Environmental Management (DAQEM) (702) 455-5942

  15. Native Desert Emissions Factor Why determine or refine? • One of the driest places on Earth • 4.4 inches of average annual rainfall • Low vegetative cover • Highly alkaline soils – powdery • Windy weather leading to soil erosion • Committed to do research in PM10 Plan

  16. Native Desert Emissions Factor How much dust from Vacant Land?

  17. Native Desert Emissions Factor How ? Working section

  18. Native Desert Emissions Factor Method • Field reconnaissance & site characterization • Selected 32 sites representing 7 of 9 major USGS soil Wind Erodibility classifications • Test as-found, then destroy crust Intentionally broke crust with gravel rake • Three runs stable, 3 unstable

  19. Native Desert Emissions Factor Results • Data undergoing analysis • Preliminary data suggests the threshold wind speeds found in 1995 were accurate • Winds speeds of 25 MPH and or gusts of 40 MPH used in PM10 Plan and Natural Events Action Plan are valid

  20. Questions? Please contact: Department of Air Quality and Environmental Management (DAQEM) (702) 455-5942

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