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Annual Conference

Dive Into Discovery

GANJ Annual Conference 2024

Advances in Applied Hydrogeology of the Newark Basin: Evolving Conceptual Site Models, Characterization Techniques & Remediation to Meet 21st-Century Challenges.

GANJ 2024 will bring together a special combination of research and consulting industry professionals (including several whose work is integral to the NJDEP groundwater guidance) for a 2-day exploration of current and emerging trends in the applied hydrogeology of the Newark Basin. The event will take place at the Stony Brook‐Millstone Watershed Institute, in Pennington, Mercer County, NJ. Day 1 will consist of 9 lectures spanning subject matter ranging from fundamental scientific principles critical to CSM development; evolving CSMs and investigative practices; evaluation of the “weathered bedrock” zone; and remediation case studies, including one dealing with PFAS. Activities on Day 2 will include hydrogeologic field demonstrations at a radial wellfield in the Passaic Formation, installed on the site in the 1960s to support research by USGS to aid understanding of the apparent strike-parallel anisotropy of rocks then referred to as the Brunswick Formation. We expect this will be an excellent learning event for people from a wide range of backgrounds there will be ample opportunity throughout both days for interactions with presenters.


October 18, 2024: 8:00 AM – 5:40 PM

Day 1 – Platform Presentations

Location – The Watershed Institute,
31 Titus Mill Rd., Pennington, NJ 08534 

Registration Breakfast

Opening Remarks – Jim Peterson, PG, LSRP

Session 1Keynote: Jessica R. Meyer, PhD – Using Existing DNAPL Contamination as a Tracer to Elucidate Aquitard Characteristics in a Layered Sandstone Aquifer System

Session 2 – Andrew Michalski, PhD, PG – Choice of Conceptual Groundwater Flow Model as a Critical Issue for Characterization and Remediation of Contaminated Bedrock Sites in the Newark Basin

Session 3 – Pierre Lacombe – Hydrogeologic Framework at a Contamination Site based on Geologic, Offloading, and Weathering Strata Augmented with Water-quality and Water-level Data and Concepts

Break – (15 min)

Session 4 – Thomas D. Gillespie, PG – Hydrostructural Geology: Examining the Anisotropy Assumption for Solute Distribution in Bedrock Aquifers

Session 5 – Gregory C. Herman, PhD – NJGS Bulletin 77 Summary of Fractured-Bedrock Aquifer Borehole Research in the Eastern Half of the Newark basin 

Lunch – (1 hour)

Session 6 – Rich Britton, PG, LSRP – Utility of the LMAS Model to Resolve Responsibility for Off-Site Groundwater Contamination in Bedrock

Session 7 – Paul Trudell – Vertical Delineation of the Weathered Bedrock Geological and Hydrogeological Unit in Central New Jersey

Break – (15 min)

Session 8 – Bob Bond, PG – Application of Environmental Sequence Stratigraphy to Sedimentary Bedrock Aquifers with Commingled and Co-located VOC and PFAS Plumes

Session 9 – Grace Chen, PE – Remediating Contaminated Bedrock Aquifer using In Situ Bioremediation Technology

Closing Thoughts – Jim Peterson, PG, LSRP

Business Meeting – Moderator, Jim Peterson, PG, LSRP

October 19, 2024: 8:30 AM – 5:00 PM

Day 2 – Field Demonstrations

Location – The Watershed Institute, Pond House, 261 Wargo Rd., Pennington, NJ 08534

Registration – Welcome                           

Field Demonstrations – Concurrent Sessions 1-5   

Breakout Session 1     Timothy Hull, PG, LSRP – Multi-parameter Geophysical Logging               

Breakout Session 2     Lee Slater, PhD – Cross-Borehole Electrical Resistivity Tomography Survey      

Breakout Session 3     Pierre LaCombe & Alex Fiore, PhD – USGS Naval Air Warfare Center Fractured Bedrock Research Findings and Rock Core Review               

Breakout Session 4     Valerie Holliday, PG – Review of Core and Geophysical Logs from a Central NJ DNAPL Site  

Breakout Session 5     Sean Kinney, PhD – Review of ongoing Research by Rutgers / LDOE Geological Core Laboratory Repository Scientists     


Field Demonstrations – Concurrent Sessions 6-8   

Breakout Session 6     Jim Peterson, PG, LSRP – Correlation of Geophysical Logs – A Crucial and Underutilized Geological Skill

Breakout Session 7     John Dougherty – 3-D Visualization of Hydrogeologic Models using Leapfrog

Breakout Session 8     Andrew Michalski PhD, PG & Tim Hull, PG LSRP – Pumping-stressed Hydraulic Monitoring (well interference) and Single Packer Hydraulic Monitoring

Take-Home Messages & Conclusion – Panel Discussion, Q&A              

Session Descriptions
Speaker Bios

Senior Hydrogeologist, Langan


Over 35 years in environmental remediation, specializing in fractured bedrock aquifers.

BOB BOND, PG is a consulting senior hydrogeologist with Langan.  He has over 35 years of environmental assessment and remediation experience and holds a B.S. Degree in Geology from Allegheny College and an M.S. Degree in Geology from Lehigh University.  Bob’s practice focuses on the hydrogeologic assessment and remediation of fractured bedrock aquifers.  He has designed, implemented, and managed numerous hydrogeologic and remedial investigations using his background in geochemistry and structural geology to model the fate and transport of contaminants. Bob has taught university short courses and regularly presents on environmental forensics, fate & transport, emerging contaminants 1,4-dioxane & PFAS, and fractured bedrock assessments. 


Groundwater Remediation Specialist


Expert in hydrogeology with extensive experience in complex environmental projects.

RICHARD BRITTON, PG, LSRP has a bachelor’s and master’s degree from Rutgers University.  He specializes in ground water investigations, remediation projects, and characterizing migration of contaminants in complex geological environments. Mr. Britton has special expertise in the hydrogeology of fractured sedimentary bedrock.  In addition, Mr. Britton works with attorneys as an expert on matters of liability, cost allocation, and the appropriateness of remedial actions; and has prepared expert reports for litigation on these issues.

Senior Environmental Engineer, CDM Smith


Focuses on remedial design and in situ treatment technologies for contaminated sites.

GRACE CHEN, PE is a Professional Engineer and senior engineer at CDM Smith with a master’s degree in environmental engineering from the University of Connecticut. Grace has extensive experience in developing conceptual site models, conducting feasibility studies, bench and pilot scale treatability studies, and remedial design to address contaminated soil and groundwater, especially using in situ treatment technologies.


Geologist and Hydrogeologist, CDM Smith

John N. Dougherty

Experienced in using advanced site characterization tools for groundwater contamination assessments.

JOHN N. DOUGHERTY is a Professional Geologist, Associate, and senior hydrogeologist at CDM Smith with a Bachelors in Geosciences from Penn State University. John has extensive experience applying a range of site characterization tools and drilling methods to the hydrogeologic characterization of groundwater contamination sites and is leading the application of ESS at CDM Smith. John uses gINT, Leapfrog, and Open Ground software to manage borehole data, to support real time decision making in the field, and to generate boring logs and cross sections. John was on the team that developed the Interstate Technology and Regulatory Council “Characterization and Remediation in Fractured Rock” guidance and was an instructor in the online training program from 2018 through 2022 when it was retired.

Alex Fiore (1)

Hydrologist, USGS New Jersey Water Science Center

Alex R.

Specializes in aquifer characterization and groundwater modeling, with a focus on contaminant dynamics.

Alex R. Fiore is a hydrologist with the USGS New Jersey Water Science Center specializing in aquifer characterization, groundwater-surface water interaction, and groundwater modeling. He has contributed groundwater hydrology expertise in a variety of applications, including assessments of contaminant transport in fractured rock and karst aquifers, hydrogeologic controls on landslide initiation, and saltwater intrusion into coastal aquifers. He has a M.S. and B.S. in Geological Sciences from Rutgers University-New Brunswick.

Principal Geologist, Gilmore & Associates

Thomas D. Gillespie

Provides geological consulting with a focus on water resources and environmental risk management.

THOMAS D. GILLESPIE, PG, Principal Geologist (Gilmore & Associates) – Tom is a licensed professional geologist providing risk reduction consultation to geo-resource-based businesses with expertise in water resource management, mining, oil & gas exploration, engineering geology, environmental risk management & investigation, and geologic hazard assessment & mitigation.  Tom served two consecutive six-year terms as a Gubernatorial appointee on the Pennsylvania State Registration Board for Professional Engineers, Land Surveyors and Geologists and served two terms as President of that Board. He represented Pennsylvania on the National Association of State Boards of Geology for 12 years and remains a member at large as a subject matter expert in structural geology, hydrogeology and engineering geology. He is a qualified expert witness in groundwater and contaminant fate and transport in all levels of the court system and has provided institutional expert consultation to government agencies, including appointment to the Department of the Army’s Technical Assistance Team. In addition to his role as Principal Geologist at Gilmore & Associates, Inc., Tom has been an adjunct professor of geology since 1988 and instructs continuing education courses for various organizations.  His research over the past ten years has been on groundwater flow through fractured media and has instructed numerous courses on his methods and models.

GANJ Headshots - Herman


Gregory C. Herman

Dedicated to studying Appalachian geology, impact tectonics, and regional neotectonics.

GREGORY C. HERMAN, PhD is a professional geologist that mapped and researched Appalachian geology for over three decades with the New Jersey Geological Survey. He’s now the staff geologist for Trap Rock Industries, LLC and continues to independently research impact tectonics, regional neotectonics, and geoarchaeological sites. His publications and blogs are on the web at


Principal Scientist, GeoLogos, LLC

Valerie Holliday

Brings over 35 years in geology and hydrogeology, providing expert litigation support.

VALERIE HOLLIDAY, PG was raised in Hunterdon County NJ, and received both BS and MS in Geology from Lehigh University, in Bethlehem PA. She is a Pennsylvania-licensed Professional Geologist with over 35 years of experience in geology/hydrogeology and environmental consulting. Her career has taken her from research in Florida Bay to oil exploration in New Mexico and California, and then to investigations of oil, gasoline, solvents and other contaminants at sites located across the U.S., particularly in New Jersey. For the last 19 years she has been the Principal Scientist at GeoLogos, LLC, where she provides technical and expert litigation support services to environmental consultants and their clients.

Professional Geologist, Site Remediation Specialist


Leads field investigations and manages data for complex environmental remediation projects.

TIMOTHY HULL is a Professional Geologist and NJ Licensed Site Remediation Professional with 20 years of experience implementing multi-media field investigations, managing large volumes of complex data, and developing concise summaries and graphics that support remediation decision making. Currently serving as Field Team Leader for complex RCRA Corrective Action and CERCLA (Superfund) projects, Tim also has expertise in oversight of drilling, remediation, surveying and geophysics subcontractors; coordination with adjacent site owners pursuant to access agreements; and preparation of quarterly progress reports. A graduate of Bates College, Tim received his training in borehole geophysics from the NGWA and equipment manufacturers.

Pierre Lacombe

Retired USGS


Focused on New Jersey’s hydrogeologic framework and community impacts during his career.

PIERRE LACOMBE retired from the U.S. Geological Survey in 2017.  During his 40-year career as a geologist, he investigated and published extensively on groundwater supply issues of New Jersey. Pierre spent much of his time investigating the hydrogeologic framework of the Newark Basin and the impact of the hydrogeologic framework of the flow of recalcitrant contaminants.  During his retirement he continues field investigations of the local geology and its impact and influence on NJ communities.


Postdoctoral Research Scientist


Investigates interactions between the Earth’s solid and climatic systems, leading projects in geologic core analysis.

SEAN KINNEY, PhD is a postdoctoral research scientist at Columbia University and a visiting research scientist at Rutgers University. He is broadly interested in how the solid Earth and climate interact to shape environments we observe on the Earth through time. He is actively engaged in extensive fieldwork across in both Eastern North America and the Southwest USA, leads several projects at the Rutgers Geological Core Repository, and is a leading proponent of three proposed scientific drilling projects in North America.

Assistant Professor
University of Iowa

Jessica R.

Specializes in groundwater flow systems and contaminant transport in heterogeneous geologic materials.

Jessica R. Meyer is an Assistant Professor in the Earth and Environmental Sciences Department and affiliated faculty in IIHR Hydroscience & Engineering at the University of Iowa. Dr. Meyer’s research focuses on improving techniques for characterization, conceptualization, and modeling of groundwater flow systems in heterogeneous geologic materials like glacial sediments and fractured bedrock. These flow system studies typically support collaborative efforts focused on a range of hydrogeologic problems. Dr. Meyer’s current studies are focused on developing quantitative methods for delineating hydrostratigraphic units to improve predictions of groundwater flow and contaminant transport, characterizing pesticide storage and attenuation in low permeability materials underlying intensively cultivated land, and quantifying water and solute exchange between groundwater and surface water to improve our understanding of element and nutrient cycling and attenuation of complex contaminant mixtures. 



Andrew Michalski

Specializes in Newark Basin’s hydrogeology and contamination with over 40 years of experience.

ANDREW MICHALSKI, PhD, CGWP, PG has investigated numerous contaminated bedrock sites in the Newark Basin over the last 40+ years. He authored seminal papers on the hydrogeology of the Newark Basin and practical characterization methods for fractured bedrock sites. His conceptualization of bedrock as a Leaky Multiunit Aquifer System (LMAS) has become the default conceptual groundwater flow model for contaminated sites within New Jersey’s portion of the Newark Basin.  As semi-retired groundwater consultant, he shares his expertise by assisting other consultants in characterization of contaminated bedrock sites.

James Peterson

Princeton Geoscience

James L. Peterson

Has 35 years of experience in environmental geology, with a focus on education and site remediation.

JAMES L. PETERSON, PG, LSRP is a PA and NY Professional Geologist and NJ Licensed Site Remediation Professional with 35 years of experience as an environmental consultant providing contaminated site investigation, remediation, and project management services. Jim has extensive experience applying geological characterization to site remediation. He is a past Chairman and Programming Chair for the Association of Environmental and Engineering Geologists (AEG) NY–PA Chapter; the current (2024) President of the Geological Association of New Jersey (GANJ); a past member of the Technical Sounding Board for the LSRPA; and is a supporting instructor for the “Groundwater in Fractured Bedrock” continuing education class at Rutgers University.  A graduate of Colorado State University, Jim worked at two leading consulting firms, gaining diverse project experience before founding Princeton Geoscience, Inc. in 2000.  Over the past 15 years, he and his team at Princeton Geoscience have developed a specialty practice, offering a range of Decision Support Services (DSS) to LSRPs and other consulting industry colleagues, to aid them in guiding their projects to successful outcomes. Princeton Geoscience DSS that are frequently employed to the advantage of consulting-industry clients include borehole geophysical logging services, specialized rock structure and matrix diffusion characterization, complex geologic site evaluation and geogenic contaminant characterization. In addition, Mr. Peterson has designed and developed prototypes for several devices employed to advance subsurface site characterization. He was recently awarded United States Patent US11860070B1 for his invention, “Volatile Organic Chemical Solid Sample Collection, Processing and Measurement Apparatus and Method”.

Geophysics Professor, Rutgers


Internationally recognized for his contributions to hydrogeophysics and educational leadership.

LEE SLATER, PhD, Distinguished Professor and Henry Rutgers Professor in Geophysics at Rutgers University Newark, is an internationally recognized expert in near surface geophysics and hydrogeophysics. He has published extensively, including 175 papers in peer reviewed international journals of hydrogeology and geophysics. Lee has served as principal investigator on multiple research and technology demonstration projects funded by the US Department of Defense, US Department of Energy, US Department of Agriculture, US National Parks Service and National Science Foundation. He has also served in prominent leadership roles in the academic geophysical community, including Chair of the Near Surface Geophysics Focus Group of the American Geophysical Union (AGU), Chair of the AGU Hydrogeophysics Technical Committee and President of the Environmental and Engineering Geophysical Society (EEGS). Lee currently serves as Associate Editor of Water Resources Research (WRR) and he recently coauthored a new advanced-level text on the resistivity and induced polarization methods applied to studies of the near surface Earth. His 16 PhD graduates have mostly gone onto academic/government research lab positions and are now making their own contributions to advancing research in hydrogeophysics.  Lee was the recipient of the 2013 Harold B. Mooney award of the Society of Exploration Geophysicists (SEG). In 2018 Lee was elected Fellow of the American Geophysical Union (AGU), with the citation: “for visionary experimentation in near surface geophysics that has advanced understanding of subsurface hydrogeological and biogeochemical processes”.

Trudell (1)

Project Hydrogeologist, WSP USA Solutions


Experienced in managing environmental projects specializing in fractured bedrock hydrogeology in the Northeast.

Paul Trudell is a Project Hydrogeologist at WSP USA Solutions, with 8 years of experience in the environmental consulting and engineering industry. He earned a BASc and MASc in Water Resources Engineering from the University of Guelph.  From his hands-on field experience and technical roles on RCRA, CERCLA, and FUSRAP site investigation projects, Mr. Trudell has developed a specialization in fractured bedrock hydrogeology. Mr. Trudell is based in New York State where he works on projects throughout the northeast region, specializing in fractured rock hydrogeology and contaminant fate and transport.


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