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EPA Vapor Intrusion Update
Former NAS Moffett FieldRestoration Advisory Board Meeting
May 10, 2012
Alana Lee
EPA Region 9
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
23 569
48 583A
146 583B
154 583C
503 596
543 944
554
5
6 Currently OccupiedBuildings Sampled by NASA– Nov 2011
13 Currently Occupied BuildingsSampled by MEW
N144
N212
N213
N240
N245
T20G
MEW Building –Specific Indoor Air Sampling Reports – Sept 13, 2011
Vapor IntrusionStudy Area –
Navy & NASABuildings
6
Sampling Status of Navy Buildings
7
22 Buildings to Be Sampled by Navy – May 2012
Navy Indoor Air Sampling Work Plan for Vapor Intrusion – May 2012
2 45 567
3 67 N210
10* 76 N239
12 107 N239A
13 126 N243
14 510 N243A
16 555
29 566
Building 10 Tunnel and Manhole Locations
8
EPA TCE Regional Screening Levels and MEW/Moffett FieldSite-specific Cleanup Levels for Chronic Exposure
EPA Regional Screening Level(RSL) – December 2011
MEW/Moffett FieldCleanup Levels
AIR(mg/m3)
Cancer(1x 10-6)
Non-cancer
INDOOR AIR(mg/m3)
Residential(24-hr)
0.4 2 1
Commercial(8-hr)
3 9 ------
Commercial(10-hr)
2 7 5
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.htmlenvironment.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