BRACBRACPMO WESTPMO WESTFormer NAS Moffett FieldFormer NAS Moffett Field

Overview of Second Five-Year ReviewOverview of Second Five-Year ReviewOperable Unit (OU) 1Operable Unit (OU) 1

September 13, 2007

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WHAT IS A 5-YEAR REVIEW?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.)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.)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?WHEN IS A 5-YEAR REVIEW REQUIRED?

• Upon completion of remedial action, hazardous substances, pollutants, or contaminants remain aboveabove 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”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 BASEMAPFORMER NAS Moffett BASEMAP

FORMER NASMOFFETT FIELD

NASA AMESRESERCH CENTER

SITE 1 LANDFILL

SITE 2 FORMER LANDFILL

Feet

N

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OPERABLE UNIT 1OPERABLE 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 REMEDYOU1 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 LANDFILLOU1 - SITE 1 LANDFILL

N

US FISH ANDWILDLIFE SERVICE

US FISH ANDWILDLIFE SERVICE

STORMWATERRETENTION BASIN

SITE 1

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OU1 5-YEAR REVIEW SUMMARYOU1 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?