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Indoor Air Vapor Intrusion Database

Indoor Air Vapor Intrusion Database. Robert S. Truesdale Environment, Health, and Safety Division Research Triangle Park, North Carolina. IAVI Database Purpose.

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Indoor Air Vapor Intrusion Database

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  1. Indoor Air Vapor Intrusion Database Robert S. Truesdale Environment, Health, and Safety Division Research Triangle Park, North Carolina

  2. IAVI Database Purpose • Compile empirical observations collected from high-quality investigations across the nation to help ensure that draft VI screening criteria are not overly or under-protective • Compare and contrast attenuation factors based on indoor air measurements paired with groundwater, soil gas, or subslab measurements • Identify factors and conditions that significantly influence subsurface to indoor air vapor attenuation (including precluding factors)

  3. Design Requirements • Strict controls on additions/changes/modifications • Expandable and maintainable for the long-term • Easy transfer to other database programs • Efficient/effective data collection instrument(s)

  4. Design Requirements (cont.) • Cost-effective data transfer to regulators and researchers • Clear, effective data summaries • Contain information to evaluate data quality, representativeness, and completeness • Can contain all data needed to apply VI guidance at subject sites

  5. Design Process • Dr. Helen Dawson’s Region 8 VI database provided key data elements and base data • 2-day meeting in Region 8 with EPA researchers, EPA regulators, State regulators to establish content, data quality objectives, preliminary specifications • Analysis of EPA data standards for database design elements and structure (OSWER DED, STORET EDD, Region 2 MEDD) • New elements and tables added for VI-specific data • Draft database design reviewed by EPA/State team, selected experts • “Final” IAVI database design

  6. IAVIdb Design

  7. IAVIdb Design (cont.)

  8. IAVIdb Design – Key Tables

  9. Data Collection Instrument • IAVIdb website (http://iavi.rti.org) • Downloadable Microsoft Access database • Data entry forms to capture key information: • Data provider • Site conditions • Building characteristics • Attenuation factors • Media concentrations (indoor air, ambient air, groundwater, soil gas)

  10. Pilot Database • Initial data collection effort to test database design, data collection instrument, collect preliminary data • Data transferred from existing Region 8 VI database • Two-month collection effort: 6 respondents, 7 sites, and 42 buildings (21 residential, 8 commercial, 13 other)

  11. Pilot Database (cont.) • Site types: 4 chlorinated solvent sites, 2 petroleum sites, 1 landfill • Attenuation factors: groundwater (13), soil gas (15), and subslab (98) • Data received in a variety of formats (forms, other electronic, hardcopy) – manual entry required in many cases • Most data received just prior to contract end, precluding significant data analysis

  12. Conclusions – Pilot IAVI Database • Database design is suitable for intended purpose • Data entry forms designed for easy entry – pilot comments and experience suggest further improvements • Respondents are busy – data collection needs to allow for form entries, electronic submittals, and hard copy submittals (as a last resort)

  13. Conclusions (cont.) • Analysis is ongoing, but preliminary data received suggest that: • the current guidance appears protective • certain petroleum compounds may attenuate to a greater degree than chlorinated hydrocarbons • Indoor contaminant sources can confound indoor air results

  14. Preliminary Results(interpretation ongoing)

  15. Preliminary Results(interpretation ongoing)

  16. Next Steps • Existing data: • confirm data with respondents • document data quality information • review data / select valid attenuation factors • identify precluding factors • summarize results • Improve data entry forms (address expert comments, add user help features) • Develop specifications for electronic data submittals

  17. Next Steps (cont.) • Develop easy-to-use summary and more detailed data outputs for regulators, researchers, other stakeholders • Solicit additional data from EPA regulators and researchers • Consider ICR to expand data collection effort to other states and private parties

  18. For database, documentation, this presentation, go to: http://iavi.rti.org Please Visit!

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