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CASTNET Progress Report

CASTNET Progress Report. November, 2005 Larry Kertcher, US EPA Office of Atmospheric Programs (OAP). Expanding the capabilities of CASTNET. Establish an assessment program to determine the feasibility of implementing next generation (hourly measurements) monitoring systems at CASTNET sites

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CASTNET Progress Report

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  1. CASTNET Progress Report November, 2005 Larry Kertcher, US EPA Office of Atmospheric Programs (OAP)

  2. Expanding the capabilities of CASTNET • Establish an assessment program to determine the feasibility of implementing next generation (hourly measurements) monitoring systems at CASTNET sites • Add advanced instrumentation to 30-40 sites • Use multi-pollutant monitors to save on cost • SO2, HNO3, HNO2, O3, NH3, • SO4, NO3, NH4, Base cations • NOy • Hourly resolution • Real-time availability of data • Implement in 3-Phase approach • Prototype • Pilot • Full deployment

  3. Next Generation Instrument Selected for Additional Testing (2 systems operating in MD) • MARGA (Monitoring Instrument for Aerosols and Gases) • -- Developed by ECN (Energy Research Center for the Netherlands) and APPLIKON, BV

  4. Criteria for Next Generation Instruments • Detection Limit < 0.1 ug/m3 for all species • 1 hour measurements of major nitrogen and sulfur species • Consumable liquids < 10 gallons/week (IC based instruments) • Non-hazardous waste liquids or by-products • Reasonably sized (fit within existing CASTNET shelter) • Internal, automated quality assurance checks • Sampling height between 4 and 10 m • Remote data availability • Data available within 24 hours of sampling • 7 day unattended operation • Relative percent difference from standard methods < 20% • Does not require specialized instrument training of field technician

  5. Program Schedule Phase I: Setup and installation June-July 2005 • Two MARGAs at Beltsville, MD installed and operating • One MARGA at Converse Station, CA installed, but not operating • Intensive study August – September 2005 Phase II: Long-term evaluation of reliability and operating performance • Jan – May 2006 Field Operations, adjustment, evaluation • June – July 2006 Intensive Study • Aug – Sept 2006 Begin Phase II, increase # sites

  6. Recent MARGA Precision Results (raw data) There appears to be a persistent bias (~15%) for particle phase ions Plans for testing the SJAC efficiency over the next two months Precision results for the two MARGA systems operating in Beltsville, MD

  7. Lessons Learned • Good: 90 % availability of data (hourly) 48 hrs. to WEB posting (Data & Maps) Met detection limits 90% availability of data (hourly) Operates 7 days continuously Consumables last over a week • Bad: Many glitches setting up Lost power, AC, storms Mactec inadequately staffed study Operator may need to receive significant training Precision of MARGAS did not meet goal QA efficiency did not function properly (diagnostics)

  8. Phase III (2006-2007) Pilot Program (Actual locations to be determined) • Contingent on successful Phase II • Pilot program of up to 10 sites • Install 5-7 additional sites for routine monitoring and operation • Actual site locations based on: • Providing regional-scale coverage • Collocation with IMPROVE • Location of two new sites • Consultation with National Park Service, RPOs, states and tribes • Filter pack measurements will continue for establishing instrument baselines and bias

  9. Phase IV (2007-2009) (Actual locations to be determined) • Full implementation at 30-40 enhanced sites • Actual site locations based on: • Providing national coverage • Collocation with IMPROVE • Consultation with National Park Service, RPOs, states and tribes • Data available through AQS and CASTNET web site • Decommissioning of old technology is contingent on alternative modeling techniques • Encourage partners to join the network

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