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Vapor Intrusion: EPA HQ: Update & Status Federal Remediation Technologies Roundtable 2009 Meeting November 10, 2009 Helen Dawson, Ph.D. Office of Superfund Remediation and Technology Innovation 1 1 Recent EPA Products National Forum

  1. Vapor Intrusion: EPA HQ: Update & Status Federal Remediation Technologies Roundtable 2009 Meeting November 10, 2009 Helen Dawson, Ph.D. Office of Superfund Remediation and Technology Innovation 1 1

  2. Recent EPA Products National Forum on Vapor Intrusion  Held January 2009 in Philadelphia  http://www.epa.gov/osp/hstl/stlworkshops.htm  Engineering Issue: Indoor Air Vapor Intrusion  Mitigation Approaches (EPA/600/R-08/115) http://www.epa.gov/ORD/NRMRL/pubs/600r08115/600r081  15.pdf Operational and Functional Determination and the  Transfer of Fund Lead Vapor Intrusion Mitigation Systems to the State http://www.epa.gov/superfund/cleanup/postconstruction/op  erate.htm 2 2

  3. VI Products in Development Vapor Intrusion Database  Background Levels of Contaminant Vapors  Conceptual Site Model  Draft TCE Toxicity Values for Risk Assessment  and the Vapor Intrusion Pathway Policy for Vapor Intrusion in Non-Residential  Settings Vapor Intrusion FAQs  Vapor Intrusion Roadmap  OIG Recommendations  3 3

  4. Vapor Intrusion Database Draft spreadsheet database of paired  observations: groundwater-, soil gas-, subslab-, and crawlspace-to-indoor air EPA VIF Reviewed  External Peer Review - Summer 2009  Regional Review Fall - 2009  Public Release - Spring 2010 (March?)  4 4

  5. Background Levels of Contaminant Vapors Compilation of background indoor air  concentrations in residential buildings for consideration when interpreting vapor intrusion data. VIF Review - Winter 2008/2009  External Peer Review - Summer 2009  Regional Review - Fall 2009  Public Release - Spring 2010 (March?)  5 5

  6. Conceptual Site Model Theoretical overview of vapor intrusion  processes and pathways under various scenarios VIF Review - Winter 2008/2009  External Peer Review - Summer 2009  Regional Review - Fall 2009  Public Release Spring - 2010 (March?)  6 6

  7. Draft TCE Toxicity Values for Risk Assessment and the Vapor Intrusion Pathway Primarily focused on California EPA and New York  State Dept of Health Signed 1/15/2009, withdrawn later  Cancer tox values in Regional Screening Level Tables (RSL)  Non-cancer values planned for inclusion in RSL  Planned re-issue without VI component  Breaking News: Draft TCE Reassessment released  Nov. 3 Cancer SSL: 0.6 ug/m3 (IUR 4E-06 per ug/m3)  Non-Cancer: 5 ug/m3 (RfC of 5 ug/m3)  7 7

  8. Policy for VI in Non- Residential Settings Provide guidance to EPA personnel in  determining when to address potential vapor intrusion (investigations) in non- residential settings Completed DoD & OSHA review  OSWER AA Signature – Spring 2010 (?)  8 8

  9. Vapor Intrusion FAQs Regional & HQ workgroup developed  VI FAQs to support RPMs Approximately 55 FAQs  Internal Review (OGC, targeted RPMs) –  June 2009 Regional Review – Fall 2009  9 9

  10. Vapor Intrusion Roadmap Document to affirm the applicable  portions of the 2002 VI Guidance along with technical updates and complimentary OSWER VI products 10 10

  11. OIG VI Investigation Interviewed HQ & Regional Offices  Program strategy, inventories, technical  Draft Report to EPA - July 2009  EPA Response - October 2009  Recommendation # 1 by Summer 2010  Recommendation # 2 by Fall 2012  11 11

  12. Vapor Intrusion Workgroups Vapor Intrusion Forum  Regional & HQ participants  (multi-disciplinary) VI Enforcement Workgroup  Regional & HQ Participants  ORCR Vapor Intrusion Workgroup  Regional & HQ participants (multi-disciplinary)  12 12

  13. EPA HQ Contact Helen Dawson  dawson.helen@epa.gov (703) 603-8833 Dave Bartenfelder  bartenfelder.david@epa.gov (703) 603-9047 Henry Schuver  schuver.henry@epa.gov (703) 308-8656 13 13

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