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Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-Dimensional
Conceptual Site Models (3DCSM) in Complex Geology
Authors: Joshua Orris, Antea Group USA and Jason Ruf, S2C2—HRSC Specialists
Session: A5
Group: #1
INTRODUCTION APPROACH
RESULTS AND
CONCLUSIONS
Typical Challenges:
1. Traditional investigation and data collection methodologies = inadequate data density, data quality and data interpolation
2. Low data density and data quality deficiencies lead to improper field geologic and hydrogeologic applied methods
3. Deficient data often leads to creating technical data gaps resulting in repeated investigations and incomplete investigations during initial
stages of a site’s lifecycle.
4. Incomplete and inaccurate site investigations often result in an inaccurate Conceptual Site Model (CSM), flawed environmental system
interpolations of geologic/hydrogeologic, microbiological-biochemistry
systems and remediation strategies.
Case Study:
Former specialty chemical manufacturing facility located in South Carolina
entered into an Administrative Consent Order in 1986. A Record of Decision
(ROD) was established in 1993 that had been amended over the next 23 years
that included a number of remedial strategies: Excavation, soil vapor
extraction (SVE), groundwater pump and treat (P&T) and In-situ Chemical
Oxidation (ISCO).
Primary Contaminants of Concern:
1,1-Dichloroethene, 1,4 Dioxane and Tetrahydrofuran with imposed
Remediation Action Levels (RALs) established as the Minimum Contaminant
Levels (MCLs)
Lifecycle Reserve Costs at Existing Strategy
The approved ROD, Remediation technology solutions implemented and approved Sampling and Analysis Plan have been operational in
perpetuity with a monetized liability estimated at $30 million in reserve
Geology:
 0-30 ft bgs. Saprolite
 0-85 ft bgs. Weathered Granite Gneiss
 Bedrock is fractured with primary fracture orientation
275 degrees with artesian springs in low lying areas
HRSC Investigation and 3-Dimensional Data Visualization CSM:
 In 2021, historical site investments with investigations and remediation data were migrated into an Geographic Information
System (GIS) and EarthSoft’s EQuIS database and exported for visualization using C Tech’s Mining Visualization Software
(MVS)
 Limited geophysical and hydrogeologic pumping test data were used to generate a geologic model
 A voluntary High Resolution Site Characterization (HRSC) investigation was completed to verify any presence of residual
source area contamination and vertically profile the presence of downgradient contaminants of concern adjacent to a stream
traversing across the site to aid in understanding the shallow hydrogeology in association with contaminant mass flux
 Passive Diffusion Bags (PDBs) were deployed to vertically profile groundwater P&T recovery wells down to 90 ft bgs.
 Surface water gauges were installed in the stream traversing the site
 Down-well monitoring data loggers were installed across the groundwater monitoring and recovery well networks
 Over 12-months the 3DCSM was enhanced with a limited suite of updated geophysics and results of the HRSC that
concluded the following:
1. Identified technical data gaps in the geologic and hydrogeological systems, resulting in an enhanced contaminant mass
flux validation
2. Identified remediation system design deficiencies
3. Provided a collaborative medium for Stakeholder engagement with Data-Driven strategy considerations
Remediation Strategy Evolution:
• P&T System and ISCO 24-month (May 2024) shut down for Hydraulic Study
• Microbial bench scale treatability study that yielded positive results for an emerging innovative technology
• Field pilot testing for the emerging innovative technology
• Updated Sensitive Receptor Survey
• Pathway Assessment Report (PAR) as an
initial phase toward updating the site’s Risk
Assessment
• Risk Assessment Update
• Monitoring Well Network Optimization
• Remove and close select
monitoring wells from SAP
• Installation of downgradient
bedrock monitoring wells for Point
of Compliance monitoring
Leveraging Technology— HRSC and historical groundwater data used as inputs to develop a comprehensive 3D CSM created
significant economic savings:
 Validated historical investments
 Enhanced understanding of Geologic/
Hydrogeologic system relationships
 Closed Technical data gaps
 Validated remediation design
deficiencies in relation to primary zone
of contaminant flux
 Foundational support for the temporary
24 month shutdown of the P&T and ISCO
systems (+$300k/year savings in O&M)
 Validated historical investments
HRSC with a 3D CSM enabled a “Best-In-Class”
solution for enhancing insights into the complex surface water bedrock systems to
modernize remediation exit strategies based upon current site conditions. The voluntary
investments implemented leverage Technology and Innovation to facilitate regulatory
stakeholder data-driven collaboration to reduce lifecycles driving long-term, cost savings.
Economic Return on Leveraging Technology and Innovation
 NPL ROD Lifecycle Cost—estimated $15M
through 2021 ($30M lifecycle projection)
 Voluntary Investments—$1.4M 2021 through
2024
 Lifecycle reduction estimated at 15+ years.
 Lifecycle Cost to Closure estimated $6M with
successful change in remediation exits strategy,
ROD amendment-update
 ROI: $15M Lifecycle Cost savings with a $1.4 -
$1.8M voluntary investment to evolve site to
modern Best Available Technology with a
foundation of data-driven strategy Exit Strategy
Development Decisions
HRSC—MiHPT
HRSC—MiHPT Log
Connect with Josh Orris:
Environmental Liability Reserve Cost Modeling
MIP—PID 3DResponse
Cross-Section of MiHPT XSD Results
Evolving Lifecycles
HRSC and 3DCSM
Complex Geology

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Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-Dimensional Conceptual Site Models in Complex Geology - Josh Orris FINAL.pdf

  • 1. Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-Dimensional Conceptual Site Models (3DCSM) in Complex Geology Authors: Joshua Orris, Antea Group USA and Jason Ruf, S2C2—HRSC Specialists Session: A5 Group: #1 INTRODUCTION APPROACH RESULTS AND CONCLUSIONS Typical Challenges: 1. Traditional investigation and data collection methodologies = inadequate data density, data quality and data interpolation 2. Low data density and data quality deficiencies lead to improper field geologic and hydrogeologic applied methods 3. Deficient data often leads to creating technical data gaps resulting in repeated investigations and incomplete investigations during initial stages of a site’s lifecycle. 4. Incomplete and inaccurate site investigations often result in an inaccurate Conceptual Site Model (CSM), flawed environmental system interpolations of geologic/hydrogeologic, microbiological-biochemistry systems and remediation strategies. Case Study: Former specialty chemical manufacturing facility located in South Carolina entered into an Administrative Consent Order in 1986. A Record of Decision (ROD) was established in 1993 that had been amended over the next 23 years that included a number of remedial strategies: Excavation, soil vapor extraction (SVE), groundwater pump and treat (P&T) and In-situ Chemical Oxidation (ISCO). Primary Contaminants of Concern: 1,1-Dichloroethene, 1,4 Dioxane and Tetrahydrofuran with imposed Remediation Action Levels (RALs) established as the Minimum Contaminant Levels (MCLs) Lifecycle Reserve Costs at Existing Strategy The approved ROD, Remediation technology solutions implemented and approved Sampling and Analysis Plan have been operational in perpetuity with a monetized liability estimated at $30 million in reserve Geology:  0-30 ft bgs. Saprolite  0-85 ft bgs. Weathered Granite Gneiss  Bedrock is fractured with primary fracture orientation 275 degrees with artesian springs in low lying areas HRSC Investigation and 3-Dimensional Data Visualization CSM:  In 2021, historical site investments with investigations and remediation data were migrated into an Geographic Information System (GIS) and EarthSoft’s EQuIS database and exported for visualization using C Tech’s Mining Visualization Software (MVS)  Limited geophysical and hydrogeologic pumping test data were used to generate a geologic model  A voluntary High Resolution Site Characterization (HRSC) investigation was completed to verify any presence of residual source area contamination and vertically profile the presence of downgradient contaminants of concern adjacent to a stream traversing across the site to aid in understanding the shallow hydrogeology in association with contaminant mass flux  Passive Diffusion Bags (PDBs) were deployed to vertically profile groundwater P&T recovery wells down to 90 ft bgs.  Surface water gauges were installed in the stream traversing the site  Down-well monitoring data loggers were installed across the groundwater monitoring and recovery well networks  Over 12-months the 3DCSM was enhanced with a limited suite of updated geophysics and results of the HRSC that concluded the following: 1. Identified technical data gaps in the geologic and hydrogeological systems, resulting in an enhanced contaminant mass flux validation 2. Identified remediation system design deficiencies 3. Provided a collaborative medium for Stakeholder engagement with Data-Driven strategy considerations Remediation Strategy Evolution: • P&T System and ISCO 24-month (May 2024) shut down for Hydraulic Study • Microbial bench scale treatability study that yielded positive results for an emerging innovative technology • Field pilot testing for the emerging innovative technology • Updated Sensitive Receptor Survey • Pathway Assessment Report (PAR) as an initial phase toward updating the site’s Risk Assessment • Risk Assessment Update • Monitoring Well Network Optimization • Remove and close select monitoring wells from SAP • Installation of downgradient bedrock monitoring wells for Point of Compliance monitoring Leveraging Technology— HRSC and historical groundwater data used as inputs to develop a comprehensive 3D CSM created significant economic savings:  Validated historical investments  Enhanced understanding of Geologic/ Hydrogeologic system relationships  Closed Technical data gaps  Validated remediation design deficiencies in relation to primary zone of contaminant flux  Foundational support for the temporary 24 month shutdown of the P&T and ISCO systems (+$300k/year savings in O&M)  Validated historical investments HRSC with a 3D CSM enabled a “Best-In-Class” solution for enhancing insights into the complex surface water bedrock systems to modernize remediation exit strategies based upon current site conditions. The voluntary investments implemented leverage Technology and Innovation to facilitate regulatory stakeholder data-driven collaboration to reduce lifecycles driving long-term, cost savings. Economic Return on Leveraging Technology and Innovation  NPL ROD Lifecycle Cost—estimated $15M through 2021 ($30M lifecycle projection)  Voluntary Investments—$1.4M 2021 through 2024  Lifecycle reduction estimated at 15+ years.  Lifecycle Cost to Closure estimated $6M with successful change in remediation exits strategy, ROD amendment-update  ROI: $15M Lifecycle Cost savings with a $1.4 - $1.8M voluntary investment to evolve site to modern Best Available Technology with a foundation of data-driven strategy Exit Strategy Development Decisions HRSC—MiHPT HRSC—MiHPT Log Connect with Josh Orris: Environmental Liability Reserve Cost Modeling MIP—PID 3DResponse Cross-Section of MiHPT XSD Results Evolving Lifecycles HRSC and 3DCSM Complex Geology