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

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Presentation to the Moffett Restoration Advisory Board, May 9, 2013, by Josh Van Bogaert, U.S. Army Corps of Engineers

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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 EngineersBUILDING STRONG®Air Sampling at theFormer Orion Park Housing AreaJosh Van Bogaert, P.E.Louisville DistrictMay 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 Summary2
  3. 3. BUILDING STRONG®Former OPHA Location3Study Area
  4. 4. BUILDING STRONG®Reason for Study Trichloroethylene (TCE) inshallow (0-40’ bgs)groundwater beneath theformer OPHA EPA requested Armyinvestigation of indoor airquality 3 Buildings4Study Area
  5. 5. BUILDING STRONG®What is vaporintrusion?5
  6. 6. BUILDING STRONG®Study Focus AreasThree 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 inclose collaboration with EPA using best industrypractices Sampling and analysis performed by USACE inaccordance with EPA-approved work plans► 6 compounds selected for analysis► All sample and alternate locations planned with EPA, 63d ArmyReserve, and building managers► Results compared to EPA Region 9 risk-based screening levels(SLs) Sampling conducted February 26-27 (Tues-Wed), 20137
  8. 8. BUILDING STRONG®Sample Types8
  9. 9. BUILDING STRONG®9 Compare OPHA Data Isolate OPHA concerns from regional influenceRegional Bay AreaAir Quality MonitoringDistrict StationsStudy 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®ResultsIndoor & Outdoor Air Exceedances13Note: 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®14ResultsSub-Slab Soil Gas LevelsNote: 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 LevelsNote:1. BAAQMD data (Redwood City and San Jose) are for2012 outdoor air.2. ND = non-detect15
  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 airlevel► Benzene exceedances are likely due to ambient outdoorpresence Sub-slab soil gas► Benzene and TCE present above SLs► No impact to indoor air observed16
  17. 17. BUILDING STRONG®Next Steps Receive and respond to EPA comments on Draft FinalReport Finalize the Report Ensure conditions remain protective of human health17
  18. 18. BUILDING STRONG®Questions? Contact EPA for Draft Final Report Final Report will be online Hard copy will be available at the Information Repository:Mountain View Public Library585 Franklin StreetMountain View, CA 94041(650) 903-6337 Questions for the Army:Kristina CurleyUS Army Environmental Command - Public
  19. 19. BUILDING STRONG®19Wind RosesDay Night