clark county pm 10 saturation study robert a. baxter, ccm t&b systems clark county air quality...
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![Page 1: Clark County PM 10 Saturation Study Robert A. Baxter, CCM T&B Systems Clark County Air Quality Forum – 03/14/06](https://reader035.vdocuments.net/reader035/viewer/2022062421/56649e425503460f94b349d1/html5/thumbnails/1.jpg)
Clark County PMClark County PM1010
Saturation Study Saturation Study
Robert A. Baxter, CCMRobert A. Baxter, CCM
T&B SystemsT&B Systems
Clark County Air Quality Forum – 03/14/06Clark County Air Quality Forum – 03/14/06
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Overview
• Objectives of the Study
• Selection of PM10 Measurement Methods
• Saturation Sampling Network
• Quality Assurance of Measurements
• Saturation Study Observations
• Overall Results and Recommendations
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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
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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
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Sampler Evaluation October/November 2004
Joe NealNon-urban
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City CenterUrbanized
Sampler Evaluation October/November 2004
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Sampler EvaluationSelected Instrumentation
• TSI DustTrak
• External data logging
• Extended sample inlet
• Solar/available power
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DAQEM Sampling Network
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DAQEM Sampling Network
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DAQEM Sampling Network
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Combined Sampling Network
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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
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Saturation Study Observations
• Historical observations• Observed climatology and meteorology• Saturation network versus DAQEM
network comparisons• High wind speed events
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Historical Observations
0
1
2
3
4
5
6
Da
ys o
f E
xce
edan
ces
W 0
0
Sp
00
Su
00
F 0
0
W 0
0/01
Sp
01
Su
01
F 0
1
W 0
1/02
Sp
02
Su
02
F 0
2
W 0
2/0
3
Sp
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Su
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F 0
3
W 0
3
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Historical Observations
0
50
100
150
200
% o
f N
orm
al P
rec
ipit
ati
on
1999 2000 2001 2002 2003 2004 2005
9 4 3 11 4 2 1# of Exceedances
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Historical Observations
Effect of wind speed on exceedance values2000 – 2003 data
0
100
200
300
400
500
600
0 5 10 15 20 25 30 35
24-Hour Average Wind Speed (mph)
PM
10 E
xc
ee
da
nc
e V
alu
e (
g/m
3 )
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0
20
40
60
80
100
120
140
160
180
200
4/15/05 4/29/05 5/13/05 5/27/05 6/10/05 6/24/05
(ug
/m3)
Study Observations
24-hour average DAQEM network PM10
May 9
May 16
May 29
June 17Fires
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0
20
40
60
80
100
120
140
160
180
200
4/15/05 4/29/05 5/13/05 5/27/05 6/10/05 6/24/05
(ug
/m3)
Study Observations
24-hour average saturation network PM10
May 9
May 16
May 29
June 17
Fires
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High Wind Speed Events
24-hour average wind speed
0
5
10
15
20
25
30
4/15/05 4/29/05 5/13/05 5/27/05 6/10/05 6/24/05
Win
d S
pee
d (
mp
h)
May 9 May 16May 29
June 17
Fires
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High Wind Speed Events
0
50
100
150
200
250
300
5/28/05 0:00 5/29/05 0:00 5/30/05 0:00 5/31/05 0:00
PM
10 (
ug
/m3)
0
5
10
15
20
25
30
Co
mp
osi
te W
S (
mp
h)
Hourly saturation network PM10 values
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High Wind Speed Events
Hourly saturation network PM10 values
0
50
100
150
200
250
300
6/16/05 0:00 6/17/05 0:00 6/18/05 0:00 6/19/05 0:00
PM
10 (
ug
/m3)
0
5
10
15
20
25
30
Co
mp
osi
te W
S (
mp
h)
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Study ResultsAdequacy of DAQEM Network
• 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
Concentration distributions for “high-PM days” were evaluated
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Network ObservationsMay 29, 2005
SaturationDAQEM
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Network Observations June 17, 2005
SaturationDAQEM
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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
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Composite June 17, 2005
Saturation and DAQEM Networks
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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
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Study Average PM10 by Hour
0
15
30
45
60
0:00 6:00 12:00 18:00
Ave
rag
e P
M10
(u
g/m
3)
0
15
30
45
60
0:00 6:00 12:00 18:00
Hour of the Day
Ave
rag
e P
M10
(u
g/m
3)
MountainCrest
Wetlands
Blue Diamond
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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
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Questions?
Please contact:
Department of Air Quality and Environmental Management (DAQEM)
(702) 455-5942