Former NAS Moffett Field

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Former NAS Moffett Field
Overview of Second Five-Year ReviewOperable Unit
(OU) 1
September 13, 2007
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WHAT IS A 5-YEAR REVIEW?

• Evaluation of in-place remedy to verify that it
  remains protective of human health and the
  environment
• Requirement under Comprehensive Environmental
  Response, Compensation, and Liability Act
  (CERCLA)
• Navy policy is consistent with EPA guidance

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WHAT IS A 5-YEAR REVIEW? (cont.)

• 5-Year Review report includes the following
• Protectiveness determination
• Documentation of any deficiencies identified
  during the review
• Recommendations for specific actions to ensure
  that a remedy will be or will continue to be
  protective
• 5-Year Review process integrates decision
  document information and operational data of
  actions at the site
• Evaluates implementation and performance of
  selected remedy

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WHAT IS A 5-YEAR REVIEW? (cont.)

• Per EPA guidance, the six components of the
  5-Year Review process are
• Community involvement and notification
• Document review
• Data review and analysis
• Site inspection
• Interviews
• Protectiveness determination

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WHEN IS A 5-YEAR REVIEW REQUIRED?

• Upon completion of remedial action, hazardous
  substances, pollutants, or contaminants remain
  above levels that allow for unlimited use and
  unrestricted exposure
• Any Record of Decision signed on or after
  October 17, 1986 effective date of Superfund
  Amendments and Reauthorization Act (SARA)

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5-YEAR REVIEW TRIGGER

• Selected remedy will not allow for unlimited use
  and unrestricted exposure
• Remedial action construction
• Initiation of construction triggers the 5-Year
  Review clock
• No remedial action construction (e.g., monitored
  natural
• attenuation, institutional controls)
• Record of Decision date is trigger
• First 5-Year Review completed within five years
• First OU1 5-Year Review in 2002
• Subsequent 5-Year reviews completed no later than
  five years after previous 5-Year Review reports

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FORMER NAS Moffett BASEMAP
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OPERABLE UNIT 1

• OU1 consists of Installation Restoration (IR)
  Site 1 Runway Landfill and former IR Site 2 Golf
  Course Landfill
• Record of Decision signed in August 1997
• In 1997, approximately 23,000 cubic yards of
  refuse from Site 2 was excavated and consolidated
  with Site 1
• No further action at Site 2 three years of
  groundwater monitoring completed

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OU1 REMEDY

• Major components of OU1 remedy include
• 12 acre, 2-foot thick, multi-layer, engineered
  cap
• Groundwater/surface water monitoring (12 wells, 2
  piezometers, 2 trench wells)
• Landfill gas monitoring (4 wells, 19 gas vents,
  21 perimeter locations)
• Institutional controls fencing and cap
  disturbance restrictions
• Inspection/maintenance of vegetative cover, cap,
  monitoring components, pump appurtenances, and
  institutional controls

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OU1 - SITE 1 LANDFILL
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OU1 5-YEAR REVIEW SUMMARY

• Draft Operable Unit 1 2007 Five-Year Review
  Report
• July 30, 2007
• Supporting information
• Groundwater monitoring results
• Landfill gas monitoring results
• Maintenance activities
• Site inspections
• Conclusion
• OU1 remedy remains effective and protective of
  human health and the environment

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• Questions?