CAMD PROGRAM UPDATE
NACAA/EPA Ambient Air Monitoring Steering CommitteeClean Air Markets Division, OAP
June 21-22 2007
Topic Summary
• CASTNET Network Status
• Multi-pollutant Contract
• Modified denuder and filter pack
• Ozone monitoring upgrade
• NADP passive ammonia monitoring
• Mercury monitoring
Network Site Status
CASTNET budget in the near future
• 25% Reduction in FY08 EPA CASTNET budget
• Translates to 8-10 sites shutting down
• Continuing reduction at NPS– Anticipate shutting down 8
sites over 5 years• Impact on Funding to NADP
– Reduce Site Audit Program– Eliminate support for 10 sites
• For 2008, 86 → ~69 sites– 45 EPA sites– 24 NPS sites
• Facing 280K per yr Ozone QA cost– Conversion may be delayed
200920092008200820072007
?
Multi-Pollutant Instrument Contract
• Initiated a performance-based instrument procurement contract for 3.4 Million to identify a high resolution, multi-pollutant instrument to replace current CASTNET technology
• Contractor must meet specific performance goals specified in the contract
- RFP issued – March 8th
- Proposals due – April 20th
- Technical Evaluation Panel (TEP) – convened and currently writing the report
- Award Date – July 1st (up to two contractors)
• Contract Breakdown (July 2007- July 2012):
- Initial Demonstration Period (30 days)
- Development Period (12 months)
- Final Demonstration Period (30 days)
- Option to Purchase, Deploy and Operate Additional Instruments (remaining 2 years)
Contract Breakdown
• Base Period (2 months)– 2 instruments delivered within 90 days of award– 30 day demonstration period– Must meet 75% of contract performance goals
• Option Period I (12 months)– 12 month development period
• Continued evaluation of progress toward contract performance goals
• Option Period II (2 months)– 30 day demonstration period
• Administered by a third-party (i.e., ETV Program)• Must meet all of the contract performance goals
• Option Period III-IV (Remaining 2 Option years 2009-12)– Exercise option to procure and deploy additional instruments– Exercise option to operate instruments
Anticipated award of contract is July 2007
Modifying the CASTNET Filterpack
Teflon Particulates
• SO42-
• NO3-
• NH4+
• Ca2+, Na+, Mg2+
• Cl-
Gaseous
• HNO3
• SO2
Nylon
Gaseous
• SO2
Whatman
Airflo
w
Filterpack Strengths: Long-term Consistent Record
p-SO42-
Total NO3- (p-NO3
- + HNO3)
Base Cations
Cost
Potential Improvements: Temporal Resolution (daily)
Add Ammonia (NH3)
p-NO3-/HNO3 Uncertain*
Ammonium (p-NH4+) Bias*
*chemistry on Teflon filter
Concurrently exploring a more traditional alternativeto online multi-pollutant analyzers
Met One Instruments SASS: Ambient Chemical Speciation Sampler
Canister
Currently the predominant sampler in the Speciated Trends Network (STN) The STN samplers collect 24-hour every 3rd day.
The SASS can be easily modified to collect sequential daily samples. The sampling method can also be modified to incorporate desired improvements.
Inlet
Denuder (1)
Denuder (2)
Modified SASS Canister
Filter (Particulate)
Acid Impregnated Filter
Denuder (1) analyzed for SO2 & HNO3
Denuder (2) analyzed for NH3
Nylon Filter analyzed for particulate: SO4
2-, NO3-, NH4
+, Cl-, K+, Na+, Mg2+, and Ca2+
Ammonium from the Nylon Filter
Rectifies p-NO3-/HNO3
Ammonia (NH3) = yes Removes Ammonium (p-NH4
+) bias24-hour samples
Rural CASTNET Ozone Monitoring
QA Requirement 40 CFR Part 58
EPA CASTNET
SLAMS OAQPS Recommendation
National Standard at EPA Regional Office vs In House Primary Standard 1/year
1/year 1/year Maintain current practice
In House Standard vs Traveling Field Standard 1/3-months
2/3-months 2/3-months Maintain current practice
Traveling Standard Calibrates Field Sampler’s zero air and O3 span gas source 1/3-months
1/6 months 1/3-months Convert to1/3-months schedule to
calibrate field sampler.
Precision & Level 1 Check 1/2-weeks
1/2-weeks Converting to
1/2-days Daily
1/2-weeks meets criteria; however more frequent checks encouraged.
Accuracy Check 1/year 1/2-year 1/year
Accuracy Check Convert to 1/year
Multipoint calibration 1/6-months 1/6-months 1/6-months Maintain current practice
Annual NPAP Audit 20 % of network per Year Not Performed
20% of network per Year
Join NPAP
Ozone Monitoring Upgrades
57 EPA CASTNET Ozone Analyzers
• 37 units need replacement
• 15 units on order
40 CFR Part 58, Ozone Monitoring Requirements by O3 season 2008?
AIRNow and AQS by O3 season 2008?
Current models are no longer supported by the manufacturer
Ozone Monitor Upgrades
Proposed NADP Passive Ammonia Network
• Purpose: To determine actual costs of network, sampling variability and other considerations
• Bi-Weekly measurements
• Core network of 10 EPA-sponsored sites– Triplicate Radiello devices + field blank– Collocated with denuder or continuous
ammonia monitoring– Ongoing evaluation of data will be used to
determine if frequency of field blanks and replicates may be reduced
– $7700 per site
• QAPP & SOPs to be prepared
• Total program cost $225K over two years
• Additional sites may be added at $5k/site
Denuder
Filter
Radiello
Ogawa
From Gay and Kenski
• Best accuracy compared to denuder measurements
• Best reproducibility
• Lowest detection limits
Radiello Measures, January 2, 2007
0.00
0.50
1.00
1.50
2.00
2.50
Bondville Athens Cincinnati Indianapolis Mayville
ppb A
mm
onia
R1
R2
R3
From Gay and Kenski
Radiellos had very promising results
Triplicate measurements
State Station Name NTNCASTNET Denuder Cont. Other
Exp. Conc. Sponsor
CO Fort Collins X Med NPS
IL Bondville X X X X Alpha Med LADCO/ISWS
IL Detroit Med LADCO/ISWS
IL Mayville ? X High LADCO/ISWS
KS AQS #20-1225-0006 X Med KDHE
NC Clinton Crops X XTEI 17C Alpha High NCSU/EPA/NCDENR
NC Jamesville XTEI 17C Alpha Med NCSU/EPA/NCDENR
NCLenoir Community College
TEI 17C Alpha Low NCSU/EPA/NCDENR
NY Connecticut Hill X X X Med Cornell/IES
ON Egbert ** X X X Alpha Med EC
SCCongaree NP, Cape Romain, or Longcreek X ? SCDHEC
OKStilwell (Cherokee Nation) X X X Med
Proposed passive ammonia sites