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CLARK COUNTY AIR QUALITY FORUM

CLARK COUNTY AIR QUALITY FORUM. Clark County PM 10 Saturation Study. Rodney Langston, Clark County DAQEM July 11, 2006. Overview. Objectives of the Study Selection of PM 10 Measurement Methods Saturation Sampling Network Quality Assurance of Measurements Saturation Study Observations

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CLARK COUNTY AIR QUALITY FORUM

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  1. CLARK COUNTY AIR QUALITY FORUM Clark County PM10 Saturation Study Rodney Langston, Clark County DAQEM July 11, 2006

  2. Overview • Objectives of the Study • Selection of PM10 Measurement Methods • Saturation Sampling Network • Quality Assurance of Measurements • Saturation Study Observations • Overall Results and Recommendations

  3. Objectives State Implementation Plan committed to a PM10 saturation study • Assess the representativeness of the current monitoring network • Determine the inter-basin and intra-basin transport during high wind speed events • Determine the neighborhood impacts of major sources in the region

  4. DAQEM Sampling Network

  5. Combined Sampling Network

  6. Saturation Study Observations • Historical observations • Observed climatology and meteorology • Saturation network versus DAQEM network comparisons • High wind speed events

  7. Historical Observations

  8. Historical Observations 9 4 3 11 4 2 1 # of Exceedances

  9. Historical Observations Effect of wind speed on exceedance values2000 – 2003 data

  10. Study Observations May 16 June 17 Fires May 29 May 9 24-hour average DAQEM network PM10

  11. Study Observations Fires May 29 May 16 June 17 May 9 24-hour average saturation network PM10

  12. High Wind Speed Events Hourly saturation network PM10 values

  13. High Wind Speed Events Hourly saturation network PM10 values

  14. Study ResultsAdequacy of DAQEM Network Concentration distributions for “high-PM days” were evaluated • 24-hour average PM10 levels relatively low • High wind speed events could have produced exceedances in prior dry years • DAQEM network reflected observed patterns in the historical analysis • Saturation network saw similar patterns but added higher values in the south

  15. Network ObservationsMay 29, 2005 DAQEM Saturation

  16. Network Observations June 17, 2005 DAQEM Saturation

  17. Study ResultsTransport During High Wind Events • Four high wind speed events • High wind speed events could have produced exceedances in prior dry years • June 17 event reflected southwest to northeast axis with apparent transport

  18. Composite June 17, 2005 Saturation and DAQEM Networks

  19. Study ResultsNeighborhood Impacts • Two sites adjacent to major sources • West side near quarry – Mountain Crest • Northeast side near quarry – Speedway • Influence of the sources could be seen at the adjacent sites in stable conditions (10-20 ug/m3) • Source contribution in high wind speeds will be related to the source mitigation efforts

  20. Study Average PM10 by Hour Wetlands Blue Diamond Mountain Crest

  21. Summary • Additional site in the south for inflow and observations during high wind speed events • Review the status of the west side sites • ~15 mph wind speeds needed for entrainment • Material handling added 10 to 20 ug/m3 to regions adjacent to quarry sites • Optical method worked well but with some limitations • Observed PM10 higher values were short lived due to limited PM reservoir • Field observations of dust mitigation appeared very effective in reducing visible emissions

  22. Questions and Comments Please contact: Rodney Langston (702) 455-1661 Department of Air Quality and Environmental Management (DAQEM)

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