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Los Alamos National Laboratory - Pajarito - Tritium

January 1, 2014 - 12:00pm


US Department of Energy Groundwater Database
Groundwater Master Report

Installation Name, State: Los Alamos National Laboratory, NM
Responsible DOE Office: National Nuclear Security Administration
Plume Name: Pajarito - Tritium
Remediation Contractor: Los Alamos National Security, LLC
PBS Number: 30
Report Last Updated: 2014




Halogenated VOCs/SVOCs Present? No
Fuel Present? No
Metals Present? No
Isotopes Present? No
Explosives Present? No
Other Contaminants? No
Tritium Present? Yes   Activity (pCi/l): 100
Nitrates Present? Yes   Concentration (ppb):  1-3
Sulfates Present? No



Conduit Flow? Yes Depth (feet): 500
Multiple Units Affected? Yes Avg Velocity (feet/year): 40


Plume Information

Source: Controlled Area of Plume (acres):  
Plume Status: Plume static or shrinking in size    


Remedial Approach

Remedy Name Status Start Date End Date


Groundwater Use / Exit Strategy

Potable? Yes Does an Exit Strategy Exist?  
Sole Source Aquifer?  yes Basis for Exit Strategy: Target Concentration


Environmental Indicators (EIs)

Groundwater Migration Under Control? Yes 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: Other
Regulatory Position on Groundwater Use Same as Site? Yes



Trace to low concentrations of nitrate and tritium are present in perched-intermediate groundwater (~500 ft bgs) and in the deep
aquifer (~800 ft bgs). Concentrations are not expected to drive active remediation, but long-term monitoring is expected to ensure no unacceptable
change in condition.