Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
SlideShare a Scribd company logo

EPA Vapor Intrusion Update to Moffett RAB May 10, 2012

•
•

The document summarizes an EPA presentation on vapor intrusion from a regional TCE plume into buildings at Moffett Field and the former NAS Moffett Field in California. It provides details on the estimated extent of the TCE plume in groundwater, the status of indoor air sampling at buildings in the study area, and EPA and site-specific screening levels for TCE in indoor air and groundwater. Contact information and websites are also provided for more information.

1 of 10
Download to read offline

1

EPA Vapor Intrusion Update Former NAS Moffett Field Restoration Advisory Board Meeting May 10, 2012 Alana Lee EPA Region 9 Lee.Alana@epa.gov

2

Vapor Intrusion Study Area – Moffett Field Area and MEW Area

3

Estimated Extent of Regional TCE Shallow Groundwater Plume

4

Vapor Intrusion Study Area – Moffett Field Area 4

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

Vapor Intrusion Study Area – Navy & NASA Buildings 6

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

Building 10 Tunnel and Manhole Locations 8

9

EPA TCE Regional Screening Levels and MEW/Moffett Field Site-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

For More Information - Websites NASA: environment.arc.nasa.gov/reports/vapor.html environment.arc.nasa.gov/maps/vapor.html EPA: www.epa.gov/region9/moffettfield www.epa.gov/region9/mew www.epa.gov/oswer/vaporintrusion/ For more information on TCE: http:/www.epa.gov/IRIS and click on TCE link

More Related Content

EPA Vapor Intrusion Update to Moffett RAB May 10, 2012

  • 1. EPA Vapor Intrusion Update Former NAS Moffett Field Restoration Advisory Board Meeting May 10, 2012 Alana Lee EPA Region 9 Lee.Alana@epa.gov
  • 2. Vapor Intrusion Study Area – Moffett Field Area and MEW Area
  • 3. Estimated Extent of Regional TCE Shallow Groundwater Plume
  • 4. Vapor Intrusion Study Area – Moffett Field Area 4
  • 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. Vapor Intrusion Study Area – Navy & NASA Buildings 6
  • 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. Building 10 Tunnel and Manhole Locations 8
  • 9. EPA TCE Regional Screening Levels and MEW/Moffett Field Site-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. For More Information - Websites NASA: environment.arc.nasa.gov/reports/vapor.html environment.arc.nasa.gov/maps/vapor.html EPA: www.epa.gov/region9/moffettfield www.epa.gov/region9/mew www.epa.gov/oswer/vaporintrusion/ For more information on TCE: http:/www.epa.gov/IRIS and click on TCE link