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 Apunsoni@Cascade-env.com Cascade Technical Services

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Have a Safe Day