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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
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
BUILDING STRONG®
Former OPHA Location
3
Study Area
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
BUILDING STRONG®
What is vapor
intrusion?
5
BUILDING STRONG®
Study Focus Areas
Three Buildings:
► Building 546 (MEPS)
► Building 593
(Navy Lodge)
► Building 685
(Office Building)
6
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
BUILDING STRONG®
Sample Types
8
BUILDING STRONG®9
 Compare OPHA Data
 Isolate OPHA concerns from regional influence
Regional Bay Area
Air Quality Monitoring
District Stations
Study Area
BUILDING STRONG®
Building 546 (MEPS)
10
BUILDING STRONG®
Building 593 (Navy Lodge)
11
BUILDING STRONG®
Building 685 (office building)
12
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
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)
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
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
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
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
BUILDING STRONG®19
Wind Roses
Day Night

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

  • 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. 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. BUILDING STRONG® Former OPHA Location 3 Study Area
  • 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. BUILDING STRONG® What is vapor intrusion? 5
  • 6. BUILDING STRONG® Study Focus Areas Three Buildings: ► Building 546 (MEPS) ► Building 593 (Navy Lodge) ► Building 685 (Office Building) 6
  • 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
  • 9. BUILDING STRONG®9  Compare OPHA Data  Isolate OPHA concerns from regional influence Regional Bay Area Air Quality Monitoring District Stations Study Area
  • 12. BUILDING STRONG® Building 685 (office building) 12
  • 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. 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. 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. 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. 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. 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