Clark county pm 10 saturation study
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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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Clark county pm 10 saturation study

Clark County PM10 Saturation Study

Robert A. Baxter, CCM

T&B Systems

Clark County Air Quality Forum – 03/14/06


Overview

Overview

  • Objectives of the Study

  • Selection of PM10 Measurement Methods

  • Saturation Sampling Network

  • Quality Assurance of Measurements

  • Saturation Study Observations

  • Overall Results and Recommendations


Objectives

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


Measurement methods

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


Sampler evaluation october november 2004

Sampler Evaluation October/November 2004

Joe Neal

Non-urban


Sampler evaluation october november 20041

Sampler Evaluation October/November 2004

City Center

Urbanized


Sampler evaluation selected instrumentation

TSI DustTrak

External data logging

Extended sample inlet

Solar/available power

Sampler EvaluationSelected Instrumentation


Daqem sampling network

DAQEM Sampling Network


Daqem sampling network1

DAQEM Sampling Network


Daqem sampling network2

DAQEM Sampling Network


Combined sampling network

Combined Sampling Network


Quality assurance

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


Saturation study observations

Saturation Study Observations

  • Historical observations

  • Observed climatology and meteorology

  • Saturation network versus DAQEM network comparisons

  • High wind speed events


Historical observations

Historical Observations


Historical observations1

Historical Observations

9

4

3

11

4

2

1

# of Exceedances


Historical observations2

Historical Observations

Effect of wind speed on exceedance values2000 – 2003 data


Study observations

Study Observations

May 16

June 17

Fires

May 29

May 9

24-hour average DAQEM network PM10


Study observations1

Study Observations

Fires

May 29

May 16

June 17

May 9

24-hour average saturation network PM10


High wind speed events

High Wind Speed Events

June 17

May 16

May 9

May 29

Fires

24-hour average wind speed


High wind speed events1

High Wind Speed Events

Hourly saturation network PM10 values


High wind speed events2

High Wind Speed Events

Hourly saturation network PM10 values


Study results adequacy of daqem network

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


Network observations may 29 2005

Network ObservationsMay 29, 2005

DAQEM

Saturation


Network observations june 17 2005

Network Observations June 17, 2005

DAQEM

Saturation


Study results transport during high wind events

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


Composite june 17 2005

Composite June 17, 2005

Saturation and DAQEM Networks


Study results neighborhood impacts

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


Study average pm 10 by hour

Study Average PM10 by Hour

Wetlands

Blue Diamond

Mountain

Crest


Summary

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


Questions

Questions?

Please contact:

Department of Air Quality and Environmental Management (DAQEM)

(702) 455-5942


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