1. Former NAS Moffett Field
Overview of Second Five-Year Review Operable Unit (OU) 1
September 13, 2007

2. 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

3. 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

4. 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

5. 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, [effective date of Superfund Amendments and Reauthorization Act (SARA)]

6. 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

7. FORMER NAS Moffett BASEMAP
MOFFETT FIELD
NASA AMES
RESERCH CENTER
SITE 1 LANDFILL
SITE 2 FORMER LANDFILL
Feet N

8. 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

9. 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

10. OU1 - SITE 1 LANDFILL N SITE 1 US FISH AND WILDLIFE SERVICE STORMWATER
RETENTION BASIN
SITE 1

11. OU1 5-YEAR REVIEW SUMMARY
“Draft Operable Unit 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

12. Questions?