laser induced fluorescence and isvs
TRANSCRIPT
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Laser‐Induced Fluorescence (LIF)and
Integrated Site VisualizationsTM (ISV)
Direct Sensing Technologyfor
Identification and Delineation ofLight Non‐Aqueous Phase Liquids (LNAPL)
at Hydrocarbon Release Sites
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Today’s Presenters:
Ed CreadenDirector, Corporate MarketingWCEC / Matrix [email protected]
Jim RolleISVTM Program ManagerWCEC / Matrix [email protected]
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Basic principles of LIF technology & operationDeploymentOutputLNAPL delineationInterferences & limitationsData analysisLNAPL Conceptual Site Model (LCSM)Case studies & ISV examples
What we will discuss:
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Laser‐Induced Fluorescence (LIF)Developed by Dakota Technologies, Inc., Fargo, ND
UVOST®
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TarGOST®
Both technologies employ lasers for excitation of polycyclic aromatic hydrocarbons (PAHs) present in NAPL.
This presentation focuses primarily on the UVOST® technology.
Tar‐specific Green Optical Screening Tool
Detects coal tars/creosotes containing moderate to heavy PAH
concentrations.
Ultra‐Violet Optical Screening Tool
Detects fuels/oils containing low to moderate PAH concentrations.
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UVOST® Features
LIF excitation of PAHs present in LNAPL
Direct‐sensing of mobile and residual LNAPL
Real‐time data, logs response vs. depth
Direct‐push delivery (CPT or push probe)
Rapid assessment (200 to 500 ft./day)
Greater cost‐effectiveness than traditional LNAPL assessment strategies
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Because PAHs such as naphthalene, perylene and anthracene predictably fluoresce at varying wavelengths and decay times when exposed to UV light, useful information regarding the presence and composition of LNAPL is available in the fluorescent response.
UVOST® Technology Description
NaphthaleneC10H8
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UVOST® Technology Description
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Conductivity Wires
Return FiberLaser Launch Fiber
Sapphire Window
Parabolic Mirror
Conductivity Dipole
Shock‐ProtectedOpticalCompartment(SPOC)
Shock‐resistant and water‐tight SPOC is advanced with direct‐push equipment.
UVOST® and computer provide real‐time data logging during assessment.
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UVOST® Deployment
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WCEC and Matrix advance the UVOST® tooling using direct‐push technology from a variety of delivery platforms.
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UVOST® Deployment
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Truck‐mounted and tracked probing units are commonly used to deploy the UVOST®.
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UVOST® Deployment
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WCEC and Matrix are often required to deploy UVOST® under complex site access scenarios.
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UVOST® Output
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The OST translates the fluorescence emission into a multi‐wavelength waveform.
3D illustration of diesel’s fluorescenceemission – wavelength/time matrix (WTM)
Diesel’s multi‐wavelengthwaveform
OST
Dakota Technologies
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UVOST® Output
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Jet fuel / kerosene
Dakota Technologies
Gasoline
Diesels
Oils
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UVOST® Output
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Real‐time logs displayresponse vs. depth
Waveform calloutson demand
Electrical conductivitysimultaneously loggedwith each UVOST® probe for lithology assessment
Representative UVOST® log
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Contamination Phases
1) Vapor Phase2) Adsorbed Phase3) Dissolved Phase (aqueous phase liquid)4) Non‐aqueous Phase Liquid (NAPL)
a) Mobileb) Residual
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Hydrocarbon contamination exists in four phases in the subsurface:
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Contamination Phases
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Contamination Phases
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Contamination Phases
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Contamination Phases
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1) Soil Boring Investigation2) Monitoring Well Network3) Vapor Survey4) Membrane Interface Probe (MIP)
Each of these is responsive to all four phases of contamination, resulting in poor delineation of the LNAPL source body.
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NAPL Assessment Tools
Standard LNAPL Assessment Methods:
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UVOST® Application
The UVOST® responds only to LNAPL, supporting the development of an accurate LCSM for risk assessment and remediation purposes.
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LNAPL Source Identification with UVOST®
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Diagram of conceptual field application of UVOST® technology
LIF‐01 LIF‐02 LIF‐03
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LIF‐01 LIF‐02 LIF‐03
Simplified UVOST® log
Diagram of conceptual field application of UVOST® technology
Simplified UVOST® log
LNAPL Source Identification with UVOST®
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LIF‐01 LIF‐02 LIF‐03
Diagram of conceptual field application of UVOST® technology
Simplified UVOST® log
LNAPL Source Identification with UVOST®
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LIF‐01 LIF‐02 LIF‐03
Simplified UVOST® log
Diagram of conceptual field application of UVOST® technology
Simplified UVOST® log
LNAPL Source Identification with UVOST®
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Simplified UVOST® log
Diagram of conceptual field application of UVOST® technologyLNAPL Source Identification with UVOST®
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UVOST® assessments collect environmental measurements at the appropriate scale of the heterogeneities which control contaminant distribution, transport and fate.
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High Resolution Data with UVOST®
Subsurface heterogeneities occur at scales that areoften too small for conventional investigationstrategies and technologies to adequatelycharacterize.
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Data density determines how clearly you will ‘see’ the picture and how accurate your LCSM will be.
UVOST® Data Density
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Data density determines how clearly you will ‘see’ the picture and how accurate your LCSM will be.
UVOST® Data Density
Greater degrees of accuracy in an LNAPL assessment support more effective and efficient remediation.
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Data density determines how clearly you will ‘see’ the picture and how accurate your LCSM will be.
UVOST® Data Density
Greater degrees of accuracy in an LNAPL assessment support more effective and efficient remediation.
But only up to a limit!We can assist our clients to develop appropriate UVOST® sampling plans for maximum cost‐effectiveness.
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UVOST® Detects:GasolineDieselJet fuel (kerosene)Motor oilHydraulic fluidsCutting fluids
UVOST® Applications & Limitations
Note: Tar‐specific Green Optical Screening Tool (TarGOST®) is used for the detection of coal tars, creosotes, heavy crudes, tank bottoms, etc.
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UVOST® Applications & LimitationsUVOST® Does Not Detect:
PCBsChlorinated HydrocarbonsDissolved phase PAHs
Note: Tar‐specific Green Optical Screening Tool (TarGOST®) is used for the detection of coal tars, creosotes, heavy crudes, tank bottoms, etc.
UVOST® Detects:GasolineDieselJet fuel (kerosene)Motor oilHydraulic fluidsCutting fluids
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UVOST® Applications & LimitationsUVOST® False Positives:
Organic matter
Sea shells
Calcite
Calcareous sands
Peat
Shorter lifetimes
“Odd” appearance Dakota Technologies
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Key Take‐Aways
LIF responds only to NAPL – Effectively differentiates NAPL from other phases of
contamination
High data density – Accurate delineation of NAPL body
Development of robust LCSM
Cost‐effective, real‐time data
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UVOST® Data Analysis & LCSM Development
WCEC provides Integrated Site Visualization (ISVTM) services to deliver a 3D representation of the site conceptual model.
Use of 3D visualization tools allows complex information to be easily evaluated and understood by both technical and non‐technical interested parties.
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High resolution GIS imagery and traditional basemap features, such as CAD drawings, topographic maps, or aerial photographs, may be combined to represent the ground surface in three dimensions, with the photographs or maps precisely placed on the topographic surface.
UVOST® Data Analysis & LCSM Development
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LIF and electrical conductivity (EC) data greatly enhance the accuracy and usefulness of the model.
UVOST® Data Analysis & LCSM Development
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Contaminant chemistry data are depicted along with lithology and stratigraphy data for a more complete understanding of subsurface contaminant fate and transport.
UVOST® Data Analysis & LCSM Development
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3D images of the extent and magnitude of the contaminant plume are used to determine volumetric parameters.
UVOST® Data Analysis & LCSM Development
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Deliverables include static images, digital animations, and dynamic 3D files with an interactive viewer.
Our ISVTM deliverables prevent misconceptions that often result when using two dimensional plots to represent the three‐dimensional subsurface environment.
UVOST® Data Analysis & LCSM Development
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UVOST® ISV™ Animations
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UVOST® ISV™ Animations
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UVOST ® Investigation Case StudyLegacy petroleum release site in downtown Polson, Montana, initial investigation in early 1990s
13 facilities with releases and individual PRP ownership
Large undefined LNAPL plume, LNAPL present in various monitoring wells across the site
Complex lithology consisting of fine‐grained, varved lakebed sediments
Sensitive surface water receptor (Flathead Lake)
Various regulatory agencies including MTDEQ, City of Polson, Lake County, CSKT Tribe & USEPA
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UVOST ® Investigation Case Study
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UVOST ® Investigation Case Study
Investigation included 138 UVOST® borings completed over 10 day period
Geospatial data points recorded for each boring using sub‐decimeter GPS equipment
Daily uploads of UVOST® response and GPS data conducted using WCEC’s Real Time Data Transmission (RTDT) service
WCEC UVOST® analyst provided daily 2D LNAPL isoconcentration maps as a tool to guide the investigation
Depth of borings was correlated to high and low pool lake elevations
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UVOST ® Investigation Case Study
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UVOST ® Investigation Case Study
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UVOST ® Investigation Case Study
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UVOST ® Investigation Case Study
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UVOST ® Investigation Case Study
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UVOST ® Investigation Case Study
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UVOST ® Investigation Case Study
Investigation successfully delineated horizontal and vertical extent of LNAPL plume allowing for targeted LNAPL recovery
Completed in 10 field days with total cost of under $100,000
Previous investigations totaled over $1M and were not successful in delineating plume
Greatly advanced the CSM through collection of detailed LNAPL distribution and geophysical data (EC)
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Thank you! Questions?
UVOST® Services:Jim DzubayLIF Services [email protected]
ISVTM Services:Jim RolleISVTM Program [email protected]
www.wcec.comwww.matrixenv.com