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Clark County PM 10 Saturation Study

Clark County PM 10 Saturation Study. Robert A. Baxter, CCM T&B Systems. Clark County Air Quality Forum – 03/14/06. 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 PM 10 Saturation Study

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  1. Clark County PM10 Saturation Study Robert A. Baxter, CCM T&B Systems Clark County Air Quality Forum – 03/14/06

  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. Evaluation Criteria Continuous Method Acceptable performance No environmental controls Solar power Inconspicuous Cost-effective Reliable Two evaluation sites Crustal PM10 Combustion emissions related PM10 Evaluated Instruments Met One E-Sampler R&P Dustscan TSI DustTrak Measurement Methods

  5. Sampler Evaluation October/November 2004 Joe Neal Non-urban

  6. Sampler Evaluation October/November 2004 City Center Urbanized

  7. TSI DustTrak External data logging Extended sample inlet Solar/available power Sampler EvaluationSelected Instrumentation

  8. DAQEM Sampling Network

  9. DAQEM Sampling Network

  10. DAQEM Sampling Network

  11. Combined Sampling Network

  12. Quality Assurance • Three scheduled audits • Evaluation study • Saturation study • Data processing and validation • Routine quality control checks • DustTrak flow and zero • Power system checks • Download and review of data • Quality Control site – Joe Neal

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

  14. Historical Observations

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

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

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

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

  19. High Wind Speed Events June 17 May 16 May 9 May 29 Fires 24-hour average wind speed

  20. High Wind Speed Events Hourly saturation network PM10 values

  21. High Wind Speed Events Hourly saturation network PM10 values

  22. 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

  23. Network ObservationsMay 29, 2005 DAQEM Saturation

  24. Network Observations June 17, 2005 DAQEM Saturation

  25. 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

  26. Composite June 17, 2005 Saturation and DAQEM Networks

  27. 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

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

  29. 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

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

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