EPA Vapor Intrusion Update     Former NAS Moffett FieldRestoration Advisory Board Meeting           May 10, 2012          ...
Vapor Intrusion Study Area – Moffett Field Area and MEW Area
Estimated Extent of Regional TCE Shallow GroundwaterPlume
Vapor IntrusionStudy Area –Moffett Field Area                     4
Sampling Status of “Unsampled” Buildings -Moffett Field Area - North of Highway 101 13 Currently Occupied Buildings       ...
Vapor IntrusionStudy Area –Navy & NASABuildings                  6
Sampling Status of Navy Buildings Navy Indoor Air Sampling Work Plan for Vapor Intrusion – May 2012  22 Buildings to Be Sa...
Building 10 Tunnel and Manhole Locations                                           8
EPA TCE Regional Screening Levels and MEW/Moffett FieldSite-specific Cleanup Levels for Chronic Exposure      EPA Regional...
For More Information - Websites NASA: environment.arc.nasa.gov/reports/vapor.html environment.arc.nasa.gov/maps/vapor.html...
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EPA Vapor Intrusion Update to Moffett RAB May 10, 2012

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EPA Vapor Intrusion Update to Moffett RAB May 10, 2012

  1. 1. EPA Vapor Intrusion Update Former NAS Moffett FieldRestoration Advisory Board Meeting May 10, 2012 Alana Lee EPA Region 9 Lee.Alana@epa.gov
  2. 2. Vapor Intrusion Study Area – Moffett Field Area and MEW Area
  3. 3. Estimated Extent of Regional TCE Shallow GroundwaterPlume
  4. 4. Vapor IntrusionStudy Area –Moffett Field Area 4
  5. 5. Sampling Status of “Unsampled” Buildings -Moffett Field Area - North of Highway 101 13 Currently Occupied Buildings 6 Currently Occupied Sampled by MEW Buildings Sampled by NASA – Nov 2011 23 569 N144 48 583A N212 146 583B 154 583C N213 503 596 N240 543 944 N245 554 T20G MEW Building –Specific Indoor Air Sampling Reports – Sept 13, 2011 5
  6. 6. Vapor IntrusionStudy Area –Navy & NASABuildings 6
  7. 7. Sampling Status of Navy Buildings Navy Indoor Air Sampling Work Plan for Vapor Intrusion – May 2012 22 Buildings to Be Sampled by Navy – May 2012 2 45 567 3 67 N210 10* 76 N239 12 107 N239A 13 126 N243 14 510 N243A 16 555 29 566 7
  8. 8. Building 10 Tunnel and Manhole Locations 8
  9. 9. EPA TCE Regional Screening Levels and MEW/Moffett FieldSite-specific Cleanup Levels for Chronic Exposure EPA Regional Screening Level MEW/Moffett Field (RSL) – December 2011 Cleanup Levels AIR Cancer Non- INDOOR AIR (mg/m3) (1x 10-6) cancer (mg/m3) Residential 0.4 2 1 (24-hr) Commercial 3 9 ------ (8-hr) Commercial 2 7 5 (10-hr) TAP WATER (mg/L) GROUNDWATER Residential 0.4 mg/L 3 mg/L 5 mg/L (MCL) 9
  10. 10. For More Information - Websites NASA: environment.arc.nasa.gov/reports/vapor.html environment.arc.nasa.gov/maps/vapor.htmlEPA: www.epa.gov/region9/moffettfield www.epa.gov/region9/mew www.epa.gov/oswer/vaporintrusion/For more information on TCE: http:/www.epa.gov/IRISand click on TCE link

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