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Oak Ridge Reservation - Bear Creek Valley

January 1, 2009 - 12:00pm


US Department of Energy Groundwater Database
Groundwater Master Report

InstallationName, State: Oak Ridge Reservation
Responsible DOE Office: Office of Science
Plume Name: Bear Creek Valley
Remediation Contractor: Bechtel Jacobs Company, LLC
Report Last Updated: 2009



Halogenated VOCs/SVOCs Present?: Yes


VOC Name Concentration (ppb) Regulatory Driver Cleanup Requirement
DCE 10000 No  
PCE 15000 No  
TCE 5000 No  


Metal Name Metal Concentration (ppb) Regulatory Driver Cleanup Requirement
Cd   No  


Isotope Name Isotope Activity (pCi/l) Regulatory Driver Cleanup Requirement
Tc 1000 No  
U 1000 No  


Fuel Present? No
Metals Present? Yes
Isotopes Present? Yes
Explosives Present? Yes
Other Contaminants? No
Tritium Present? No
Nitrates Present? Yes
Sulfates Present? No
Concentration: 40000000 (ppb)



Conduit Flow? Yes Depth (feet): 0
Mulitple Units Affected? Yes Avg Velocity (feet/year): 100


Plume Information

Source: Controlled Area of Plume (acres): 500
Plume Status: Plume expanding but not expected to
migrate offsite


Remedial Approach

Remedy Name Status Start Date End Date
monitored natural attenuation Proposed 2015 2100
reactive barrier Confirmed 2000 2006
source control Confirmed 2000 2020


Groundwater Use / Exit Strategy

Potable? Yes Does an Exit Strategy Exist? No
Sole Source Aquifer?  No Basis for Exit Strategy: No Response


Environmental Indicators (EIs)

Groundwater Migration Under Control? No Current Human Exposure Acceptable? Yes
Confirmed by Lead Regulator? Yes Confirmed by Lead Regulator? Yes



Decision Document? Assessment Ongoing Lead Regulatory Agency: Federal
Date Approved:   Regulatory Driver: RCRA
Regulatory Position on Groundwater Use Same as Site? No



The reactive barrier did not perform as expected. Majority of contaminants already released from source. Source control likely to have minimal impact. VOCs associated with DNAPLs in fractured shale occur to depths of at least 500 ft. Additional characterization and monitoring data required to evaluate MNA. Long-term fate of buried U metal as additional sources of U contamination uncertain. Long-term O&M costs and needs for reactive barriers uncertain. TI Waiver (for VOCs) or Groundwater Reclassification Petition.