High Resolution Site Characterization for Contaminated Site Remediation Oregon Brownfields Conference Andrew Punsoni Northwest Program Manager Cascade Technical Services
High Resolution Site Characterization for Contaminated Site
Remediation
Oregon Brownfields Conference
AndrewPunsoniNorthwestProgram
ManagerCascadeTechnicalServices
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What is HRSC ?
• Spatial structure of hydrogeologic variables controlling contamination distribution, transport, and fate is on the centimeter scale
• Remedies involving injection/extraction of fluids are controlled by the same variables at the same scales
Subsurfaceinves<ga<onappropriatetothescaleofheterogenei<esinthesubsurfacewhichcontrolcontaminantdistribu<on,transport,
andfate,attherequireddegreeofdetail
HRSC is not just “Direct Sensing”. It requires a suite of tools and approaches used in a strategic manner.
Industry Past
Tradi&onalSiteAssessment=‘Shoo&ngfromthehip’
Industry Evolution
HRSC=TargetedCharacteriza&on(andwelldesign)
HRSC Addresses Two Critical Issues • Sampling Scale and Data Averaging
– Measurements must be made at a scale that is meaningful with respect to the variability of the quantity being measured
• Coverage – Profiles and Transects – Horizontal spacing – Vertical spacing
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~2
5 c
m
mm-Scale Textural Changes Control DNAPL Migration Poulsen&Kueper,1992
DNAPLdistribu&oniscontrolledbycapillarypressuresthatvaryatthemmscale.Distribu&onisverycomplex.
KeyPoint
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ToolBox Technology Purpose
ElectricalConduc<vity(EC) DetermineRela<veGrainSizeIncludedwithMIPandHPTdata
MembraneInterfaceProbe(MIP)
VOCDelinea<on,
HydraulicProfilingTool(HPT) Rela<veHydraulicConduc<vity
MiHPT CombinedSystemWaterlooProfiler HydraulicConduc<vity&SamplingUVOST/TarGOST FuelLNAPLDelinea<on/MPG&
CreosoteMobiLab ISO17025Cer<fiedLabData
CoreDFN Migra<onPathwayDetermina<on
MiHPT–MembraneInterfaceHydraulicProfilingTool
• ProvidingtheWholePicture– Lithology:ElectricalConduc<vity(EC)
– VOCMass:MembraneInterfaceProbe(MIP)
– HydraulicConduc&vity:HydraulicProfilingTool(HPT)
• 3Tools–OneBoring
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WaterlooAPS™ Data Acquisition Configuration and Process
Notebook computer
Flow meter
Data acquisition electronics String potentiometer on drill rig/
Geoprobe® measures depth
Real-time Ik and water quality data
Pressure vacuum gauge
Reversible variable-speed peristaltic pump
or gas-drive pump Water quality sensor
Valve
Compressed nitrogen
Stainless steel pressure vessel with analyte-free
water
Pressure transducer
1/8” stainless steel tubing
Waterloo profiler tip with stainless steel screened inlet ports
Sample bottles with stainless steel holders
Onsite lab
Measures: § Specific conductance § pH § Dissolved O2 § Oxidation-reduction potential (ORP)
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UVOST Field Log
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Jet/KeroseneGasDieselOils
Jet/KeroseneGasDieselOils
Fully Accredited Onsite Laboratories
NELAPAccreditedNJ,NY
ISO17025Cer<fied
Ouronsitelaboratoriesarefullyaccreditedandprovidethesamehighqualitydatathatyourconven<onallaboratorydoes,butwith:
• Rapidturnaround
• Onsiteconvenience(nopackingandshipping)
• Lowercost
• Flexibility
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Core DFN Conceptualization of Source Zone and Plume Evolution in Fractured Sedimentary Rock
Transect Approach for Groundwater Contaminant Plumes
Flow DNAPL Layers
Solu
bilit
y
Profile SourceZone
SteveChapman–UniversityofGuelph
• Profiles– Closever<calspacingofsamplingpoints/measurementsatasingleloca<on
– Smallvolumeofsample/measurement
– Ver<calspacing?• Transects– Seriesofprofilesalongalineorientedatarightangletothedirec<onoftransport
– Horizontalspacing?• Notlongitudinalsec<onsOutside In Approach
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Thank You For Listening!
Andrew Punsoni Program Manager
925.768.8377 [email protected] Cascade Technical Services
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Have a Safe Day