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Approved Regional Method (ARM) Demonstration

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  1. Approved Regional Method (ARM) Demonstration Puget Sound Clean Air Agency Mike Gilroy, Erik Saganic

  2. Overview • Definition of the ARM • Sites and Instruments that may apply • ARM Tools • Preliminary Results

  3. What is the “ARM”? • The Approved Regional Method • EPA established in 40 CFR 58, Appendix C, Section 2.4 • Defined in CFR as “Approved regional method (ARM) means a continuous PM2.5 method that has been approved specifically within a State or local air monitoring network for purposes of comparison to the NAAQS and to meet other monitoring objectives. ”

  4. Pertinent Information (Source: 40 CFR 58, Appendix C, Section 2.4) • Applications can be accepted as of 09/28/06 to EPA-ORD. • Must meet Class III FEM guidelines. However, if low levels are typical, may approve large bias. • 30% collocation of “required FRM/FEM/ARM sites” rounded up with 1 in 6 collocated frequency • ≥ 7.5% of sites for the comparison requires a collocated candidate ARM for Coefficient of Variation (CV) calculations.

  5. Pertinent Information (Source: 40 CFR 58, Appendix C, Section 2.4) • Data can be recalculated in non-linear fashion • Details must be included in Agency QAPP and ARM application to ORD. • Section “2.4.2.4 The ARM must be capable of providing for flow audits, unless by its inherent measurement principle, measured flow is not required.” • Need: 1-2 FRMs and 1-2 candidate monitors for each ARM. Validate periodically with changing aerosols and instrument performance.

  6. Pertinent Information (Source: 40 CFR 58, Appendix C, Section 2.4) • Yearly assessments • Network assessments every 5 years • Data Duration: 1 year (seasons) • ≥ 90 sample sets required • ≥ 20 per season required • Up to 2 CBSA/CSA & 1 Rural or MSA, 1 of each in areas already approved • If WA DoE already accepted, than can go straight to Region X office for approval • External audits are required as an FEM.

  7. Our Objectives • Collect 1-year of precision collocated data for all perspective ARM samplers • To package all our applicable data for analysis • Determine if the data meets regulations • To compile all the necessary QAPP’s • Submit the data package for approval if all the data meets regulations

  8. PSCAA Sites with Recent FRM Data • Snohomish County (Possibly non-attainment): • Marysville (Wood Smoke Aerosol) • Darrington (Wood Smoke Aerosol) • Lynnwood (Wood Smoke Aerosol) – Analysis no longer on-going • Pierce County (Will be non-attainment): • South Tacoma (Wood Smoke Aerosol) • King County (Attainment): • Lake Forest Park (Wood Smoke Aerosol) • Seattle – Duwamish (Industrial Aerosol)

  9. Other Recent FRM Data Available in Washington • Clark County • Vancouver – (Urban Residential Aerosol – Wood smoke) • Data good only through 2004 • King County • Seattle – Beacon Hill (Urban Residential Aerosol) • Okanogan • Twisp – Rural site (Wood smoke/Forest fire Aerosol?) • Data good only through 2004 • Spokane County • Spokane – Ferry Street (Aerosol type - Industrial?) • Yakima County • Yakima (Aerosol type – Industrial/Agricultural?) • Data good only through 2004

  10. Sites in WA since 2004 with FRM data that does not meet ARM requirements • Benton County • Kennewick (Discontinued after 2005, ran only 1/6 sampling) • Spokane County • Spokane – Monroe Street (Discontinued after 2005, ran only 1/6 sampling)

  11. PSCAA Potential Candidate ARMs by Site • Darrington • Nephelometer (ongoing) • Lake Forest Park • Nephelometer (ongoing) • TEOM (ongoing) • Lynnwood • Nephelometer (Old Data) • FDMS-TEOM (Old Data) • TEOM (Old Data) • Marysville • Nephelometer (ongoing) • TEOM (ongoing) • Seattle – Duwamish • Nephelometer (ongoing) • FDMS-TEOM (after a year of data completion) • TEOM (older data) • South Tacoma • Nephelometer (ongoing) • TEOM (ongoing)

  12. Other WA Potential Candidate ARMs by Site • Beacon Hill • Nephelometer (ongoing) • TEOM (ongoing) • Spokane – Ferry Street • Nephelometer (ongoing) • TEOM (ongoing) • Vancouver • TEOM (2004 only) • Yakima • Nephelometer (2004 only) • Twisp • Nephelometer (2004 only)

  13. Tools for the ARM • Templates are available that contain all the details necessary to apply for the application • Excel file with calculations built in • Word Document to describe the sites, methods, descriptions, QA procedures, etc.

  14. Example of Excel Summary Tab – Marysville Nephelometer

  15. Will any instruments be approved? • Preliminary correlations indicate yes. • However, as aerosols change overtime, there may be difficulty for surrogate analyzers (like the nephelometer). • There is a 30% collocated FRM requirement in the network that would monitor this issue.

  16. Word Document Example

  17. Summary • In Washington state, we have a few analyzers that we will aim to achieve ARM status: • Nephelometer • TEOM • TEOM-FDMS • Preliminary analysis indicates the data fits the criteria, but we are at the mercy of EPA-ORD • Evolving aerosols are still of some concern and sites may loose ARM status

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