case studies from doe closure sites: emphasis on reduction ... · 2 office of closure support...
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Case Studies fromDOE Closure Sites:
Emphasis on Reduction of Risk andRequirements for Long Term
Monitoring in Site Closure Design
Carol A. Eddy-Dilek and Brian B. Looney
Savanna River Technology Center
April 20, 2004
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Office of Closure Support (EM-23)
qTechnical assistance from nationallyrecognized experts
q Focus is support to site with acceleratedclosure schedules
qRocky Flats and Ohio (Ashtabula,Columbus, Mound, Fernald) in 2006
q Parts of Oak Ridge Reservation in 2008q Sites are currently developing
Stewardship Plans
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Intelligent Closure Design
qDesign of Remedial and Closuresystems can significantly impact longterm monitoring requirements
q Low-energy hydraulic controls can beused to contain and focus residualcontamination and optimize monitoringrequirements
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Ashtabula Closure Project (ACP)
qRMI Extrusion Plant operated for DOEqRMI processed uranium between 1962
and 1968q Primary function was extrusion of
metallic uraniumq Extensive Contamination of Surface
Soilsq Localized U and solvent contamination
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ACP Regulatory framework
q Cleanup of radioactive contamination (TCE, Tc-99) isbeing conducted under Decommissioning Plan
§ DP initially approved by NRC
§ Now under regulatory authority of Ohio Department ofHealth (ODH)
q TCE contamination
§ Waste Management Unit (WMU)
§ Estimated 1.3 acre groundwater plume
§ Ohio Environmental Protection Agency (OEPA) regulatoryauthority
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Current Clean-up Levels
Total Uranium 30 pCi/g
Tc-99 65 pCi/g
TCE 5 ug/L
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Hydrogeology
qVery low permeability glacial sedimentsqUpper till has thin sand and silt lenses
in the predominately clayey materialqResidual contaminants present in clayey
material
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Closure Strategy
q Excavate source termqResidual contamination in groundwater
expected to exceed regulatory levelsq Install gravity induced pumping system
to pull back contaminated groundwaterfor treatment
qAmendments could be added to highpermeability backfilled material
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Map view of Possible Closure System
cree
k
Pond
s (p
oten
tial
mon
itorin
g or
com
plia
nce
poin
t)
GeoDrain
excavated source and line(s)backfill w/ coarse fill or treatment bed
hill
horizontal wells or drains if needed
treatment bed or system as needed
amendments if neededto remaining soil &
groundwater
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excavation
initial water level
constant operatingwater level-- free
draining or controlledmanually
Treatment Options
in situ usingamendments in
backfillor
ex situ using waterfrom drain orpumped well
Possible Configuration of Closure System
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Advantages of Proposed Design
qHydraulic control of residual plumeqCollection of contaminated groundwater
focused to one collection pointqAmendments could be used to further
stabilize contaminationqHigh permeability fills would improve
gradients
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Monitoring Design
q Initially monitor groundwater toestablish contaminant trends
qGroundwater at discharge point couldbe collected/monitored/treated
qMonitoring options include§ Periodic analysis of water samples§ Sensor at outfall location to measure
trigger levels§ Sorbent/integrated sampling system for
periodic analysis
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East Tennessee Technology Park
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East Tennessee Technology Park
qTwo thousand acres potentiallyimpacted by site activities
q Zone 1: Area outside operationalfences where most disposal activitiesoccurred
qCOC’s include VOC’s, heavy metals,radionuclides, PCB’s
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Zone Map ofthe EastTennesseeTechnologyPark
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Graded Approach
q Site developed graded approach for sitecharacterization, remediation, andclosure
q Four classes of soil unitsqDeveloped criteria for classificationqDeveloped strategy for characterizationqBlair Quarry chosen as pilot area for
approach
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Soil Unit Classification
qClass 1 Soil Unit§ is, or was, impacted (potentially influenced
by contamination)§ the SU has moderate to high potential for
COC concentrations to exceed RLs; and§ insufficient evidence for no-action
qClass 2 Soil Unit.§ SU is, or was, impacted;§ there is low to moderate potential for COC
concentrations to exceed RLs; and§ insufficient evidence for no-action decision.
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Soil Unit Classification
qClass 3 Soil Unit§ the unit is, or was, impacted§ there is no or very low potential for COC
concentrations to exceed RLs; and§ there is insufficient for no-action decision.
q Class 4 Soil Unit/Non-impacted.§ no evident anthropogenic impacts will be
designated as Class 4/Non-impacted.
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Graded Approach
qAnticipated that only units found toClass 1 will require consideration forlong term monitoring.
qUse of graded approach limits greatlyareas to be monitored and focusesactivities on areas with higher risk.
qMovement of areas from Class 1 toClass 2 may be allowed based onresults of characterization studies.
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Conclusions
qDesign of remedial and closure systemscan significantly impact long termmonitoring requirements
q Experience is that closure sites resistinnovations relative to baseline asclosure dates approach.