bluescape air modeling for non-modelers: what's up with the new ambient standards webinar 10-12-10
TRANSCRIPT
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8/8/2019 BlueScape Air Modeling for Non-Modelers: What's Up with the New Ambient Standards Webinar 10-12-10
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Air Modeling for Non-Modelers:Whats Up with the New Ambient Standards?
James A. WestbrookOctober 12, 2010
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Agenda: New Ambient Standards Compliance with ambient standards
w
Strategies to pass the standards:
Challenges you may face
Quick refinement techniques to consider More advanced techniques
Exam le for the 1-hour NO2 standard
Conclusions
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BlueScape, Inc.
20 years experience
ore t an mo e ng pro ects
National Experience with AERMOD,, o er mo e s
Solve tough air quality modeling issues:- vo mo e ng requ remen s
- Develop meteorological data and monitoring data
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- Agency negotiations and protocols
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What is Air Quality Modeling Used For? Compliance with criteria pollutant ambient
standards
Permits, minor source NSR, PSD major source Environmental Impact Reports (EIRs)
Human Health and Ecological Risk
Assessments Accidental chemical spills
Long-range visibility impacts
Toxic tort litigation
AERMOD is the re ulator workhorse
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Typical Air Quality Modeling Study
Need a Project
Triggered by exceeding emissions significance
levels Modeling against significant impact levels (SILs), or
e u s an ar
Hourly meteorological data and terrain data
,
- Project impacts +
- Other facilit sources +
- Nearby facilities +
- Monitored background concentrations
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Primary National
*
PollutantAveraging
PeriodValue
(g/m3)**
PM10 24-hour 150PM2.5 24-hour 35
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NO2 Annual 100
SO2 1-hour 196
SO2 24-hour 367
CO 1-hour 10,000
CO 8-hour 40,000
* Partial List** Equiv. units; state agencies may have different standards
See: www.arb.ca.gov/research/aaqs/aaqs2.pdf for standards
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New Ambient Standards
EPA has released three policy memos:*
New NO2, 1-hour average, 100 ppb or 188 g/m3
New SO2, 1-hour average, 75 ppb or 196 g/m3
Justify PM10 as a surrogate for PM2.5 or model-. ,
EPAs unfinished business
, ,
Background monitoring data availability
Secondary PM2.5 formation, condensibles
www.epa.gov/region7/air/nsr/nsrmemos/appwno2.pdf
www.epa.gov/region7/air/nsr/nsrmemos/appwso2.pdf
htt ://bit.l /9NeHnh
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New Air Modeling Challenges
om ust on sources
- Relatively high NO2 emissions
- PM10=PM2.5
Short engine or vehicle stacks, mean highermpac s
Low significance levels require full modeling ro ec n nex - years
- Due diligence modeling
- trateg c es gn process- Stay close on EPA / state agency developments
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Quick Fix Modelin Strate ies to Pass
Pro ect desi n chan es
Emission limitations-
- Limit hours of operation
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- Voluntary control technology installation
Increase gas flow rate and temperature
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Advanced Strategies to Pass
PVMRM, OLM and ARM for NO2, as limitedby ozone
Source Test for in-stack NO2/NOx ratios Modify the PM2.5 fraction in PM10, if relevant
Review / adjust meteorological data
Spatial / temporal modeling- Show project does not cause or contribute tosignificant impacts
- Monitoring at Point of Maximum Impact
y
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Modeling Example
Large gas-fired boiler and emergencydiesel en ine
Baseline, all NOx = NO2; high max. 1-.
Refinements:-
b) PVMRM with hourly ozone data, in-stackNO2/NOx = 0.2
c) Source test for in-stack NO2/NOx ratio
d) Stack height increase, reduce emissions
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Baseline 1-hour NO2 Run
13Impact = 1,132 + 88 = 1,220 g/m3 = FAIL!!
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Modeling Refinements
14Impact = 78 + 88 = 166 g/m3 = PASS!!
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Model Run Summary
Baseline H8H Pull the Stops
Max. 1-Hour Av . 1 132 /m3 636 /m3 78.3 /m3NOx Concentration
w/background88 g/m3
1,220 g/m3 724 g/m3 166 g/m3
Form of Result H1H H8H H8H
PVMRM Used? No No Yes
In-Stack NO2 Ratio -- 0.20 0.10
En ine Stack Hei ht 12 feet 12 feet 25 feet
% of Max HourEngine Emission Rate
100% 100% 50%
15Advanced refinements were needed to pass .
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Conclusions
New NO2, SO2 and PM2.5 ambient standards willcause new challenges
xpec u con rm a comp ca e u mpac
modeling may be required
Conduct modelin due dili ence earl to troubleshootproblems
Hire an expert modeling consultant- Experience with the latest tools and guidance
- Experience passing the standards using advanced
- Interact with state agencies, come with a strategy
- Stay on top of developing EPA and state guidance
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Next Webinar
s epor ng rogram n :
Are You Ready?
- What do I need to do to prepare?
- Key reporting timelines
- What are the roles and responsibilities?
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- EPA software preview, reporting needs and data gap-filling
- Alternative calculation methodologies
htt s://www2. otomeetin .com/re ister/836647746
Tuesday, December 7, 9 AM
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Contact with Questions
James A. Westbrook, President
BlueScape, Inc.858-774-2009 (cell)
www.bluesca einc.com
The Webinar resentation will be osted on
Slideshare and Scribd (search for BlueScape)