UPDATE ON DAQS AIR QUALITY MEASUREMENTS & MERCURY STUDIES NC DENR/DAQ Mercury/CO 2 Workshop Raleigh,...
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Transcript of UPDATE ON DAQS AIR QUALITY MEASUREMENTS & MERCURY STUDIES NC DENR/DAQ Mercury/CO 2 Workshop Raleigh,...
![Page 1: UPDATE ON DAQS AIR QUALITY MEASUREMENTS & MERCURY STUDIES NC DENR/DAQ Mercury/CO 2 Workshop Raleigh, NC April 19, 2004 Steve Schliesser Todd Crawford NC.](https://reader035.fdocuments.net/reader035/viewer/2022081602/5515642155034691418b4bea/html5/thumbnails/1.jpg)
UPDATE ON DAQ’S AIR QUALITY MEASUREMENTS & MERCURY
STUDIES
NC DENR/DAQ
Mercury/CO2 Workshop
Raleigh, NCApril 19, 2004
Steve Schliesser
Todd Crawford
NC Division of Air Quality
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Presentation Summary
DAQ Hg studies in Eastern NC
- Waccamaw Study
- Hg from Wet Deposition
- Ambient Air Hg near Chlor-alkali Plant Charlotte-Mecklenburg Air Hg Study
- Four locations in 2002 & 2003 Summary / Conclusions & Plans
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Drivers for DAQ Hg Studies in Eastern NC
Blackwaters sensitive to Hg 1970 – Cited Hg in Cape Fear River fish Hg in Fish up to 1.5 ppm Hg in H2O 10X Safe Drinking Level Hg in Humans - 3.4 ppm in Blood of Fish Eaters, 10X > Non Fisheaters
- 34 ppm in Hair of Fish Eaters - Some of Highest Levels Recorded in US
Discovery of more widespread Hg issues
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Mercury Deposition Network (MDN) in Eastern NC
2 MDN Sites in Eastern NC for Wet Deposition and Ambient Air Monitoring Starting in 1996
Annual Wet Deposition Data
from 9,000-19,000 ng/m3 Noticeable Reduction Trend from 1998-
2002
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Eastern NC Mercury Emission Sources
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MDN US Network in 1999 (NC08 = Lake Waccamaw site,
NC42 = Pettigrew State Park site.)
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MDN Wet Deposition Collection System
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Annual Cumulative Hg Wet Deposition
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Mercury Wet Deposition, as Volume-Weighted Avg Concentration (ng/L) by
Season, Site & Year.
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0
site and year
vol-w
eig
hte
d a
vera
ge
Hg
co
nce
ntr
atio
n (n
g/L
)
October-March
April-September
October-March 5.14 5.84 4.73 5.68 5.83 6.16 6.78 6.82 5.46 6.40
April-September 12.28 12.32 9.54 7.02 9.22 14.56 13.87 15.25 8.69 11.45
phelps 96 phelps 97 phelps 98 phelps 99 phelps 00 wac96 wac 97 wac 98 wac 99 wac 00
.
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Mercury in Ambient Air near Waccamaw MDN Site
Total and Speciated Hg Air Monitoring
- TGM up to 300 ng/m3 –5 min Avg
- TGM Annual Avg 2.3 ng/m3
- TGM Background < 2 ng/m3
- RGM up to 300 pg/m3 – 2 hr Avg
- RGM background < 2 pg/m3
Air with Met Data Argued Chlor-Alkali Plant Main Contributor, Leading to Plant Closing in 1999
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Total Gaseous Mercury Measured at Riegelwood Flynn Site in 1999
Riegelwood Flynn, March - June 1999
0
40
80
120
160
200
240
280
320
360
Date
TG
M (
5-m
inu
te a
ve
rag
e, n
g/m
3)
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Riegelwood Ballpark, TGM vs. Wind Direction, 1999
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Observed Relationships between Reactive Gaseous Mercury, Elemental
Mercury, & Meteorology
Variable Reactive Gaseous Mercury (RGM)
Elemental Mercury (Hg0)
Time of Day Elevated readings primarily in daylight hours
No clear pattern; high levels in day and night
Humidity Inverse proportional trend; RGM suppressed by high humidity conditions.
No clear pattern; high and low levels across all humidity levels
Temperature None None
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Comparison of Hg Deposition & Eastern NC Regional Emissions
Comparison of Deposition Rate and Regional Emissions
0
500
1000
1500
2000
2500
3000
Calendar Year
Hg A
nnua
l Em
issi
ons,
lb/yr
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
Wet
Dep
ositi
on, n
g/m
2
Hg Emissions 2716 1285 497 460 679
NC08 18811 17362 12193 9083 10213
NC42 10027 7907 10829 6097 7777
1998 1999 2000 2001 2002
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Mecklenburg / Charlotte Ambient Mercury Study in 2002-2003
EPA NATA Study Predicted Mecklenburg County Atmospheric Mercury Levels in Top 5% of US Counties
Charlotte Surrounded by Mercury Emission Sources: Electric Utilities, Medical Waste Incinerator, Large Industrial Boilers
Given No Prior Data, DAQ Initiated Ambient Air Mercury Monitoring Study for TGM, RGM, Hg0
Setup 4 Sites around Charlotte
- One Near Downtown
- Other 3 in Suburbia Completed Data Collection – Reported in 2004
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1996 US Estimated County Median Ambient Mercury Concentrations
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1996 Estimated County Median Ambient Mercury Concentrations
– NC Counties
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Location and Size of NC Electric Utility Plants
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Summary & Conclusions NC has / had relatively high Hg,
well above US average, in terms of:- Emissions into ambient air- Measurements in specific ambient airsheds- Modeling in specific ambient airsheds- Wet deposition levels- Fish of selected species- People who eat selected fish species NC data suggests high humidity could reduce
ambient RGM, while promoting wet deposition
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Future Plans Finalize Charlotte Area Ambient
Mercury Monitoring Study Report Consider Arrangements for New Hg
Study in Piedmont, including: - MDN Site(s) for wet deposition, - Ambient Air Hg and Meteorological Monitoring- Assessing Relationship Between Hg Emissions, Wet Deposition, Meteorology, & Ambient Air Levels