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EPA Vapor Intrusion Update


     Former NAS Moffett Field
Restoration Advisory Board Meeting

           May 10, 2012




            Alana Lee
          EPA Region 9
        Lee.Alana@epa.gov
Vapor Intrusion Study Area – Moffett Field Area and MEW Area
Estimated Extent of Regional TCE Shallow Groundwater
Plume
Vapor Intrusion
Study Area –

Moffett Field Area




                     4
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
Vapor Intrusion
Study Area –



Navy & NASA
Buildings




                  6
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
Building 10 Tunnel and Manhole Locations




                                           8
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
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

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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