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US Army Corps of Engineers BUILDING STRONG® Air Sampling at the Former Orion Park Housing Area

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US Army Corps of Engineers BUILDING STRONG® Air Sampling at the Former Orion Park Housing Area

  1. 1. US Army Corps of Engineers BUILDING STRONG® Air Sampling at the Former Orion Park Housing Area Josh Van Bogaert, P.E. Louisville District May 9, 2013
  2. 2. BUILDING STRONG® Orion Park Housing Area (OPHA) Presentation Overview  Reason for Study  Planning and Execution ►General planning info ►Sample types and locations ►Regional data  Draft Final Report and Results  Summary 2
  3. 3. BUILDING STRONG® Former OPHA Location 3 Study Area
  4. 4. BUILDING STRONG® Reason for Study  Trichloroethylene (TCE) in shallow (0-40’ bgs) groundwater beneath the former OPHA  EPA requested Army investigation of indoor air quality  3 Buildings 4 Study Area
  5. 5. BUILDING STRONG® What is vapor intrusion? 5
  6. 6. BUILDING STRONG® Study Focus Areas Three Buildings: ► Building 546 (MEPS) ► Building 593 (Navy Lodge) ► Building 685 (Office Building) 6
  7. 7. BUILDING STRONG® Planning & Execution  Work Plans based on EPA work plans and developed in close collaboration with EPA using best industry practices  Sampling and analysis performed by USACE in accordance with EPA-approved work plans ► 6 compounds selected for analysis ► All sample and alternate locations planned with EPA, 63d Army Reserve, and building managers ► Results compared to EPA Region 9 risk-based screening levels (SLs)  Sampling conducted February 26-27 (Tues-Wed), 2013 7
  8. 8. BUILDING STRONG® Sample Types 8
  9. 9. BUILDING STRONG®9  Compare OPHA Data  Isolate OPHA concerns from regional influence Regional Bay Area Air Quality Monitoring District Stations Study Area
  10. 10. BUILDING STRONG® Building 546 (MEPS) 10
  11. 11. BUILDING STRONG® Building 593 (Navy Lodge) 11
  12. 12. BUILDING STRONG® Building 685 (office building) 12
  13. 13. BUILDING STRONG® Results Indoor & Outdoor Air Exceedances 13 Note: All results in µg/m3  Benzene exceeded residential SL ► 3 of 3 outdoor air samples ► 9 of 10 indoor air samples
  14. 14. BUILDING STRONG®14 Results Sub-Slab Soil Gas Levels Note: All results in µg/m3  Benzene exceeded residential SL in: ► 2 of 9 sub-slab soil gas samples - Buildings 593 (Navy Lodge) and 685 (office building)  Benzene exceeded non-residential SL in: ► 1 of 9 sub-slab soil gas samples - Building 593 (Navy Lodge)  TCE exceeded residential SL in: ► 2 of 9 sub-slab soil gas samples - Building 546 (MEPS)
  15. 15. BUILDING STRONG® Relative to Regional Ambient Air Levels Note: 1. BAAQMD data (Redwood City and San Jose) are for 2012 outdoor air. 2. ND = non-detect 15
  16. 16. BUILDING STRONG® Summary  No exceedances of applicable EPA SLs  Indoor and outdoor air ► No TCE exceedances of SLs in indoor air ► Benzene indoor air results less than non-residential SL ► Benzene results are less than the average regional outdoor air level ► Benzene exceedances are likely due to ambient outdoor presence  Sub-slab soil gas ► Benzene and TCE present above SLs ► No impact to indoor air observed 16
  17. 17. BUILDING STRONG® Next Steps  Receive and respond to EPA comments on Draft Final Report  Finalize the Report  Ensure conditions remain protective of human health 17
  18. 18. BUILDING STRONG® Questions?  Contact EPA for Draft Final Report  Final Report will be online at: www.epa.gov/region9/mew  Hard copy will be available at the Information Repository: Mountain View Public Library 585 Franklin Street Mountain View, CA 94041 (650) 903-6337  Questions for the Army: Kristina Curley US Army Environmental Command - Public Affairs Kristina.curley@us.army.mil 18
  19. 19. BUILDING STRONG®19 Wind Roses Day Night

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