EPA Vapor Intrusion Update

Former NAS Moffett FieldFormer NAS Moffett FieldRestoration Advisory Board Meeting

September 8, 2011

Alana LeeEPA R i 9EPA Region 9

Lee.Alana@epa.gov

Vapor Intrusion Study Area – Moffett Field Area and MEW Area

Estimated Extent of Regional TCE Shallow Groundwater Plume

Sampling Status of “Unsampled” Buildings -Moffett Field Area - North of Highway 101

12 Currently Occupied Buildings To Be Sampled by

12 Currently Occupied Buildings Sampled by MEW July 2011

23 569

Buildings To Be Sampled by NASA – Sept/October 2011

Sampled by MEW – July 2011

N14423 56948 583C

146 583A

N144

N212146 583A503 583B543 596

N213

N240543 596554 944

N245

T20G

5

T20GBuilding –Specific Indoor Air Sampling Reports – Sept 13, 2011

Implementation of Vapor Intrusion Remedy - Progress and Schedule

• EPA Statement of Work – Remedial Design & Remedial Action Work Requirements & Schedule - August 2011Action Work Requirements & Schedule August 2011includes Building-specific and Site-wide Work Plans,Sampling, Long-term Operations, Monitoring, and Maintenance Institutional Controls ReportingMaintenance, Institutional Controls, Reporting

• Amended Consent Decree to DOJ – Sept 2011p• Amended 106 Order - Sept 2011

Sit id S li W k Pl t D t i R• Site-wide Sampling Work Plan to Determine Response Action Tier - Sept 29, 2011

6

• Upcoming Sampling and reporting – Sept 2011 on

For More Information - Websites

NASA: environment arc nasa gov/reports/vapor htmlenvironment.arc.nasa.gov/reports/vapor.html environment.arc.nasa.gov/maps/vapor.html

EPA: www.epa.gov/region9/mewwww.epa.gov/region9/mewwww.epa.gov/region9/moffettfieldwww.epa.gov/oswer/vaporintrusion/ p g p