EPA Vapor Intrusion Update to Moffett RAB May 10, 2012
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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.
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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
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
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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
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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)
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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