BlueScape Air Modeling for Non-Modelers: What's Up with the New Ambient Standards Webinar 10-12-10

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

-

- 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

-

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

,

- 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)

[email protected]

www.bluesca einc.com

The Webinar resentation will be osted on

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BlueScape Air Modeling for Non-Modelers: What's Up with the New Ambient Standards Webinar 10-12-10

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