Moffett Landfill Five-Year Review

transcript

BRACBRACPMO WESTPMO WEST

Former NAS Moffett FieldFormer NAS Moffett FieldFormer NAS Moffett Field

Site 22 First FiveSite 22 First Five--Year ReviewYear Review

Wilson DoctorNavy Project Manager

March 13, 2008RAB Meeting

Presentation OverviewPresentation OverviewPresentation Overview

• Five-Year Review

• Site 22– Background– Remedy

What is a FiveWhat is a FiveWhat is a Five---Year Review?Year Review?Year Review?

• Evaluation of in-place remedy to verify that it remainsprotective of human health and the environment

• Requirement under Comprehensive Environmental Response,Compensation, and Liability Act (CERCLA)

• Navy policy is consistent with EPA guidance

What is a FiveWhat is a FiveWhat is a Five---Year Review? (cont.)Year Review? (cont.)Year Review? (cont.)

• Five-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

• Five-Year Review process integrates decision document information andoperational data of actions at the site

• Evaluates implementation and performance of selected remedy

What is a FiveWhat is a FiveWhat is a Five---Year Review? (cont.)Year Review? (cont.)Year Review? (cont.)

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

When is a FiveWhen is a FiveWhen is a Five---Year Review Required?Year Review Required?Year Review Required?

• Upon completion of remedial action, hazardous substances,pollutants, or contaminants remain aboveabove levels that allowfor unlimited use and unrestricted exposure

• Any Record of Decision signed on or after October 17, 1986[effective date of Superfund Amendments andReauthorization Act (SARA)]

FiveFiveFive---Year Review Year Review Year Review “““TriggerTriggerTrigger”””

• Selected remedy will not allow for unlimited use and unrestrictedexposure

• Remedial action construction– Initiation of construction triggers the Five-Year Review clock

• No remedial action construction (e.g., monitored naturalattenuation, institutional controls)

– Record of Decision date is trigger

• First Five-Year Review completed within five years

• Subsequent Five-Year reviews completed no later than five years after previous Five-Year Review reports

Site 22Site 22Site 22

Site 22 BackgroundSite 22 BackgroundSite 22 Background

• Landfill operated from 1950 through 1967

• Approximately 90,000 cubic yards domestic waste

• Approximately 10 acres

• Final Record of Decision June 2002

• Landfill cover construction 2003

Site 22 RemedySite 22 RemedySite 22 Remedy

Major components of the Site 22 remedy include:

• Multi-layer, engineered cover– Layers of soil, gravel, cement, and cobblestone

• Groundwater monitoring (10 wells)

• Landfill gas monitoring (Four perimeter wells, 15 surface locations, 13 perimeter locations)

• Maintain cover integrity

• Institutional controls

Site 22 ConstructionSite 22 ConstructionSite 22 Construction

Site 22 Ongoing ActivitiesSite 22 Ongoing ActivitiesSite 22 Ongoing Activities

• Quarterly methane monitoring

• Quarterly groundwater monitoring

• Regular maintenance

• Quarterly landfill inspections

• Annual Reports

• Land surveying

Site 22 FiveSite 22 FiveSite 22 Five---Year Review ReportYear Review ReportYear Review Report

• Draft Five-Year Review Report Nov. 7, 2007

• Final Five-Year Review Report Feb. 11, 2008

• EPA concurrence March 4, 2008

• Next Five-Year Review Report 2013

FiveFiveFive---Year Review IssuesYear Review IssuesYear Review Issues

• No constituents above screening levels with exception of:– Chloroform in groundwater– Methane in landfill gas

• Memorandum of Agreement/Institutional Controls

FiveFiveFive---Year Review RecommendationsYear Review RecommendationsYear Review Recommendations

• Continue groundwater and landfill gas monitoring

• Complete Memorandum of Agreement– August 2008

Site 22 FiveSite 22 FiveSite 22 Five---Year Review ReportYear Review ReportYear Review Report

Protectiveness Statement

• Site 22 landfill cover remedy protects human health and the environment

• Implement institutional controls

Questions?Questions?Questions?

Moffett Landfill Five-Year Review

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