Presented by: Mike Hamdan
South Coast Air Quality Management District
Diamond Bar, CA
Presented at:
The Tribal Air Monitoring Training , Pechanga Reservation, CA
South Coast AQMD
South Coast AQMD
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South Coast Basin:
4-county region
10,000 sq. miles
16½ million residents
Hundreds of thousands ofdiesel vehicles
11,000,000 gasoline vehicles
Combined Ports of Long Beach andLos Angeles = nation's largest cargo gateway
Science & Technology AdvancementScience & Technology Advancement
Atmospheric MeasurementsAtmospheric Measurements
Air Monitoring NetworkAir Monitoring Network
Special MonitoringSpecial Monitoring
Instruments Configuration
Zero AirGenerator
Ozone
ESC Data Logger(8832)
Video ChartRecorder(Chessell)Generator
InstrumentManifold
Multi-GasCalibrator
Minute Polling
Database
Sampling Probe
Ozone Standards
Transfer standards (different levels)– a transportabledevice or apparatus that is capable of accuratelyproducing or assaying ozone concentrations. Thesetypes of instruments undergo a certification process.
Primary standards – a device capable of assaying ozoneconcentrations by UV photometry in accordance withthe Code of Federal Regulations, part 50, Appendix D(40CFR50).
Certification/Verification
Calibration - establishes a correction factor to adjust orcorrect the output of an instrument. This isdetermined through a comparison between aninstrument and SRP at varying levels of ozone.
Certification - establishes traceability of a transferstandard to the SRP. The certification of an instrumentrequires the results of six calibrations to meetrequirements established by U.S. EPA.
Continued.
Verification - establishes comparability of a primarystandard to the SRP. The verification of an instrumentrequires the results of one calibration to meetrequirements established by U.S. EPA; however, theoutput of the instrument is not to be corrected basedupon the results of the calibration.
O3 standards certification andverifications
Primary O3 standard is compared with R9 SRP(standard reference photometer) annually.
O3 field standards (Transfer Standards)are certifiedevery 3 months using verified primary standard.
Flow standards are certified against NIST standardsannually.
Station Instrument verification &Calibration
Daily zero and span except for Tuesday.
Weekly zero and precision check (every Tuesday)
O3 instrument multi-point calibration every 6 monthsor as needed. (as is then final)
Gas calibrator (flow controller & O3 generator)certification every 6 months (as is then final).
Data Validation Levels
3 data validation levels.
Level I is done by the station operator. Review chesselldata, complet field data sheets, note zero and spanvalues that are exceeding the control limits, documentproblem with the instruments, document any unusualevents at or near the site.
Level II & III data validation
Level II and III are done by office staff.
Review data in time series plots.
Backfill missing data from back up system.
Comparison of current data with historical data.
Compare Ozone concentration to meteorology and toozone reading from nearby sites.
Assign data flags due to fires, construction.
Data Screening
Review data that exceeds historical data max. from thesite.
Determine if consecutive equal data values are valid.
Check if data falls outside the calibrated range.
Check for blocks of missing data.
Check for consistency of data with season and time ofday.
Data Invalidation
If pc/span values are outside +/- 7 %.
Not enough data points to calculate valid hourlyaverage.
Station temperatures are not within 20-30 Deg. C.
Data produced during calibration, audit, andmaintenance that are not flag by the data logger withproper invalid flag.
Contact Information
Mike Hamdan
South Coast Air Quality Management District
Office: (909) 396-2267
Cell: (909) 967-492315