Moffett Restoration Advisory Board EPA Vapor Intrusion Update

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Moffett Restoration Advisory Board EPA Vapor Intrusion Update

  1. 1. EPA Vapor Intrusion Update Former NAS Moffett FieldRestoration Advisory Board Meeting July 14, 2011 Alana Lee EPA Region 9
  2. 2. Estimated Extent of Regional TCE Shallow GroundwaterPlume
  3. 3. Vapor Intrusion Study Area – Moffett Field Area and MEW Area
  4. 4. MEW Area – Sampled and UnsampledCommercial Buildings 40 Sampled Buildings 32 Unsampled Buildings 4
  5. 5. Sampled Buildings – Moffett Field Area N Residential Area21 Commercial and 14 Residential Buildings 5
  6. 6. Currently Occupied Buildings to Be Sampled by MEWMoffett Field Area 12 Buildings 23 569 48 583C 146 583A 503 583B 543 596 554 944 6
  7. 7. Currently Occupied Buildings to Be Sampledby NASA in Moffett Field Area 7 Buildings N144 N245 N212 N248 N213 T20G N240 8
  8. 8. Sampling of Unsampled Buildings – MEW and Moffett Field Area EPA October 8 Letter to Parties (MEW, Navy, NASA) ( , y, ) Draft Site-wide Indoor Air Sampling and Analysis Work Plan – December 2010 Access, Building Walk-throughs, HVAC evaluations – Feb - June 2011 Final Work Plan & EPA Conditional Approval – June - July 2011 Sampling – July - September 2011 10
  9. 9. Implementation of Vapor Intrusion Remedy- Process• Sampling to Determine Response Action Tier Draft Work Plan by Sept 29, 2011• EPA St t Statement of W k – W k Requirements t f Work Work R i t Discussions with MEW, Navy, and NASA to conduct the work – nearing completion• Continued community involvement activities y 11
  10. 10. For More Informationwww.epa.gov/region9/mewwww.epa.gov/region9/moffettfield Alana Lee EPA Region 9 Superfund Division 415.972.3141 Lee.Alana@epa.gov

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