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Hydrogeology / Geohydrology Expert Witnesses

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Randy D. Horsak, PE
Environmental Forensics Expert
PO Box 941735
Houston TX 77094
USA
phone: 281-752-6700
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Randy D. Horsak, PE is a scientist and registered Professional Engineer with more than 40 years of experience in all phases of Environmental Science and Engineering. President of 3TM Consulting, LLC, Mr. Horsak provides consulting in the areas of environmental engineering, geology and hydrogeology, ecology, land use, human and ecological risk assessment, and remediation and decontamination.

Litigation Support - Mr. Horsak supports attorneys for both Plaintiff and Defense. His clients include industrial and commercial companies, attorneys, land owners and realtors, toxicologists and medical doctors, and other consultants.

Environmental Projects Including:
  • Air Pollution
  • Ambient Air Quality Testing
  • Noise
  • Soil and Sediment
  • Groundwater and Surface Water
  • Water Treatment and Purification
  • Contaminated Dust
  • Ecosystems
  • Sites and Facilities
    • Abandoned Sites
    • Hazardous Waste Management Facilities
    • Refineries and Chemical Plants
    • Fossil and Nuclear Power Plants
    • Geothermal Energy Plants
  • Manufacturing and Commercial Facilities
  • Pipelines
  • Power Transmission Lines
  • Oil and Gas Exploration and Production
  • Public and Private Properties
  • View Mr. Horsak's Consulting Profile.
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    David Wilshaw, MS, PG
    President
    P.O. Box 783547
    Winter Garden FL 34778
    USA
    phone: 407-342-7737
    David Wilshaw, MS, PG has over 33 years of experience in Engineering Geology, Geotechnics, Hydrogeology and Geoenvironmental assessments. Established in 2012, his company Britannia Solutions LLC has continuously provided Sinkhole Neutral Evaluation and expert geological opinions to insurance carriers, private individuals, corporations and their respective legal advisers. Mr. Wilshaw offers services as a professional geologist and expert witness with respect to disputed sinkhole insurance claims and many other specialized areas of engineering geology, specifically Slope Failures, Underground Mining Subsidence and the Adequacy of Ground Investigations in relation to claims under construction contracts.

    David Wilshaw has been a Florida DFS-certified Neutral Evaluator under §627.7074 Florida Statutes since 2011. He is licensed as a Professional Geologist in Florida, Pennsylvania and Tennessee and is registered as a Chartered Geologist and Fellow of the Geological Society in the United Kingdom. He has been Adjunct Professor of Earth Science since 2015. In the last 8 years, he has been the statutory Professional Geologist under s.627.707 Florida Statutes for over 850 cause of subsidence investigations related to sinkhole loss claims across Florida, from the Panhandle to the Florida Keys.

    Litigation Services Include:
    • Testifying Expert at Deposition over 120 times.
    • Testifying Expert at Trial over 30 times.
    • Neutral Evaluation of over 135 Disputed Sinkhole Insurance Claims in accordance with Section 627.7074 Florida Statutes
    • Peer review and expert opinion to defense and plaintiff attorneys on over 2,000 disputed claims for sinkhole loss
    View Consulting Profile.
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    James A. Jacobs, PG, CHG, CPG
    229 Tewksbury Ave.
    Point Richmond California 94801
    USA
    phone: 510-590-1098
    fax: 510-232-2823
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    James A. Jacobs, PG, CHG, CPG, has over 30 years of experience as a Geologist / Hydrogeologist and licensed contractor focused on answering geologic, environmental impairment, and forensic questions. He is a certified hydrogeologist in California and Washington and a Professional Geologist in California and several other states.

    A Fulbright Senior Scholar with 4 awards in environmental engineering and science, his projects relate to collecting, describing, and analyzing Soil, Rock, Groundwater, Vapor, and Stormwater samples, summarizing the data and creating useful technical information and cost recovery statements for decision makers or settlements. His other projects relate to peer review and contractor evaluation projects.

    Mr. Jacobs has provided litigation services in the investigation and analysis of cases involving contamination by hydrocarbon and solvent spills and leaks, erosion, flooding, and related issues. He has provided testimony assisting with many settlement conferences. Mr. Jacobs is qualified to testify in municipal, state, and Federal courts.

    Litigation Support and Expert Witness:
    • Perform litigation and technical support for various environmental and engineering cases from evaluating remediation history to well damage to erosion control
    • Estimate reasonable and necessary remedial costs for settlement conferences
    • Serve as an objective peer reviewer
    • Expert witness testimony on environmental cases
    Since 2002, Mr. Jacobs has been an elected director of two public agencies, a local sewer district, and a community services district. As such he is interested in I&I issues and sewer gas and volatile contaminant vapor intrusion into indoor air spaces via ineffective vapor seals on fixtures or dry P-traps in buildings. He performs cost allocations for environmental litigation, and also provides oil and gas production verification.

    View James Jacobs' Consulting Profile.
    James A. Jacobs, et. al (eds.)
    Put together by a team of scientists, engineers, regulators, and lawyers, the Chromium(VI) Handbook consolidates the latest literature on this topic. The broad scope of this book fills the need for a comprehensive resource on chromium(VI), improving the knowledge of this contaminant at a time when the extent and degree of the problem is still being assessed. It addresses naturally occurring and anthropogenic sources, geology and geochemistry, toxicity, treatment, regulatory issues and legal cases, and recommendations.
    James A. Jacobs, et al
    Provides the tools needed to analyze and solve acid drainage problem. Featuring contributions from leading experts in science and engineering, this book explores the complex biogeochemistry of acid mine drainage, rock drainage, and acid sulfate soils. It describes how to predict, prevent, and remediate the environmental impact of acid drainage and the oxidation of sulfides, offering the latest sampling and analytical methods. Moreover, readers will discover new approaches for recovering valuable resources from acid mine drainage, including bioleaching.
    James A. Jacobs, et al
    The definitive guide to petroleum hydrocarbon fuel spill and leak causes, prevention, response, and cost recovery.It highlights the complex nature of petroleum hydrocarbon fuel extraction methods, the unintended consequences when disasters occur, spill behavior, and environmental impact mitigation. This practical resource discusses engineering techniques; long-term biological and environmental effects; dealing with insurance claims, litigation, and legislation in overlapping jurisdictions; and much more.
    James A. Jacobs, et. al (eds.)
    Written by an expert team of scientists, engineers, and toxicologists, MTBE: Effects on Soil and Ground-Water Resources provides complete in-depth coverage of the assessment and potential remediation strategies of methyl tertiary-butyl ether (MTBE).
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    Environmental Advisors
    30445 Northwestern Highway, Suite 260
    Farmington Hills MI 48334
    USA
    phone: 248-932-0228
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    Dragun Corporation is an industry leader in Environmental Regulatory Issues and Consulting for clients across North America and internationally. From manufacturing and real estate to chemical companies and livestock agriculture and municipalities.At Dragun, science, engineering, and decades of expertise converge through in-depth critical analysis, conceptualized approaches, and technical application. The result is an environmental site assessment, remediation, compliance assessment, or expert services support that helps clients in diverse industries.

    Litigation Support - Dragun Corporation has built its litigation services on a foundation of critical analysis and forensic science that thoughtfully considers each aspect of the environmental issue. They review the existing data, collect new data when necessary, challenge interpretations, and ask the questions no one else has.

    With more than 100 litigation support projects completed, Dragun is ready to assist you. They are experts in site characterization, assessment, remediation, regulatory compliance, and risk-based closures.

    Areas of Expertise:
    • Environmental Engineering
    • Environmental Remediation
    • Chemical Fate and Transport
  • Environmental Isotopes
  • Geology
  • Hydrogeology
  • Michael Sklash Hydrogeology Expert PhotoMichael Sklash, PhD, PEng, Senior Hydrogeologist at Dragun Corporation, has over 40 years of experience in solving complex Groundwater Problems. Dr. Sklash uses a wide range of tools including environmental isotope tracing, high resolution site characterization, and groundwater modeling to develop robust conceptual site models for site remediation, and litigation purposes.

    Dr. Sklash's research from the 1970s through the 1990s led him to become world renown in his field of Isotope Hydrogeology. It is now a keystone in the understanding of how groundwater interacts with streams, and his publications are frequently termed “bench mark.” During his academic days, Dr. Sklash was a visiting scientist in many places around the world, including: New Zealand, Australia, England, China, India, and Africa. He was a consultant to the USEPA and Atomic Energy Canada Limited, among others.

    Dr. Sklash uses his skills to untangle complex, and often confusing, groundwater problems and put them in “order” so a remedial plan becomes obvious or a Court can see the way. He has led the technical team on many of Dragun’s most challenging projects, including: the groundwater nexus issue in a wetlands dispute that went to the U.S. Supreme Court (Rapanos); avoiding expensive remediation at a complex TCE-impacted site in Michigan acquired by the Norwegian global aluminum manufacturing company Norsk Hydro; and recently successfully challenging the remediation plan of the US Army Corps of Engineers at a Cold War legacy site in Kansas. Mike has also helped many attorneys, local entrepreneurs, and municipalities with their environmental problems.

    Expertise: Groundwater modeling, environmental isotope tracing, and other techniques required to characterize a site so that the best remedial option can be implemented.

    Matthew Schroeder Environmental Engineering Expert PhotoMatthew C. Schroeder, MS, PE, Senior Environmental Engineer at Dragun is a registered Professional Engineer in six states. Mr. Schroeder has over 20 years of experience in environmental remediation at industrial sites, municipal and industrial landfills, and former military operations, and environmental compliance for industrial, municipal, and commercial clients. He has managed projects in over thirty states and provinces in the United States and Canada.

    Mr. Schroeder's training at one of the finest engineering universities in the United States formed the basis for his uncompromising, thorough, and thoughtful approach to projects. His “no stone unturned” philosophy to each and every project is expected of environmental engineers, but not always delivered. Mr. Schroeder's experience includes time spent performing field investigations, inspecting landfills, and observing both simple and complex tank removals and site remediation efforts. Over the last two decades, he has developed a unique ability to integrate complex soil and groundwater data to perform feasibility studies and design and implement remediation. Matt has extensive experience in assessment and remediation of chemicals associated with vapor intrusion (TCE, PERC, etc...). He also has designed groundwater remediation to address PFAS. Matt has published in international, scientific, and legal journals.

    With a keen eye toward detail and a customer-centric focus, Mr. Schroeder has won the admiration and appreciation of several long-term clients. He has assisted them with site closures, solved their environmental permitting and planning issues, counseled them on delisting petitions, represented them in regulatory negotiations and in court, and provided soil and groundwater remediation solutions.

    Expertise: Soil and groundwater remediation, closure of above ground and underground storage tanks, groundwater modeling, environmental compliance, vapor intrusion evaluation, preparation of feasibility studies.

    Jeffrey Bolin Hazardous Waste Expert PhotoJeffrey A. Bolin, MS, CHMM, Sr. Vice President of Technical Operations at Dragun, has a Masters of Science in Hazardous Waste Management and is a Certified Hazardous Waste Manager. His clients have sought his expertise and advice on sites across the United States, Canada, South America, and Europe.

    Mr. Bolin's hands-on experience and education, specific to the environmental sciences provide him with a solid perspective on environmental issues. His equanimity complements his Masters of Science degree in hazardous waste management. As a Certified Hazardous Materials Manager (CHMM), he is knowledgeable in Environmental Regulations and has successfully assisted clients during negotiation with the United States Environmental Protection Agency (USEPA) and state regulatory agencies.

    Mr. Bolin's experience traverses the modern environmental compliance field. As the laws and regulations were being developed and implemented, he spent time collecting hazardous waste samples for the Resource Conservation and Recovery Act, water samples for the Clean Water Act, and PCB samples for the Toxic Substance Control Act. His assessment of commercial industrial properties across North America pre-date the environmental due diligence framework. It was Mr. Bolin's insightful approach to environmental due diligence that earned him recognition as an “Elite” provider of services by a real estate publication.

    Mr. Bolin is routinely asked to share his knowledge by teaching other professionals at seminars, and he was previously a an adjunct professor. He has also published articles in a number of trade journals on environmental due diligence, vapor intrusion, conceptual site models, and more.

    Expertise: Management of site investigations, environmental due diligence, environmental compliance, remedial investigation, and remediation, merger & acquisitions, divestitures, and assessment of current and future environmental liability.

    View Dragun Corporation's Consulting Profile.
    7/11/2018
    "Michigan Environmental Experts Teach Malaysian Petrochemical Company"
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    Chuck Dutill, PE, DFE
    Expert Witness | Principal Consultant
    1240 West Chester Pike, Suite 213
    West Chester PA 19382
    USA
    phone: 610-701-5650
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    For over 35 years, Chuck Dutill, P.E., D.F.E., has been performing Hydrology and Environmental Engineering nationwide. He has focused on wastewater, stormwater, flooding, sewers, septic systems, groundwater, drainage, runoff, hydrology, hydraulics, backups, drinking water, and air quality.

    Litigation Support - Mr. Dutill has spent approximately 25% of his professional time providing expert witness services for over 35 years. Approximately 50% of his expert witness services have been for defendants and about 50% for plaintiffs.

    He has issued 115 to 120 expert reports, been deposed approximately 35 to 40 times, and testified in federal and state court (including jury and non-jury trials) approximately 25 to 30 times. Forensic cases have occurred in more than 30 states. As indicated in feedback from attorneys on expert witness cases, some of his strengths include understandable guidance, responsiveness, timeliness, communication, effective report writing, strong testimony (including on cross), efficiency, organization, and assistance with framing case issues.

    Expertise:
    • Hydrology
    • Flooding
    • Wastewater Treatment
    • Septic Systems
    • Sewer Systems
    • Sanitary Sewage
    • Groundwater
    • Stormwater Management
    • Drainage
    • Runoff
    • Water Mains
    • Backups
    • Mold
    • Wells
    • Hydrogeology
    • Storm Sewers
    • Hydraulics
    • Erosion
    • Drinking Water
    • Air Quality
    • Water Quality
    • Detention
    • Maintenance
    • Construction
    • Operations
    • Design
    • Inspections
    • Floodplains
    • Contamination
    • Toxicity
    • Hazardous Waste
    • Spills
    • Grading
    • Remediation
    • Pollution
    • Sinkholes
    • Health and Safety
    • Pumping
    • Modeling
    • Odors
    • Soils
    • Dams
    • Regulations
    • Combined Sewers
    • Overflows
    • Aquifers
    • Water Distribution
    • Water Treatment
    • Hydraulic Fracturing
    • Standard of Care
    • Sedimentation
    • Hydroplaning
    • Wetlands
    • Landfills
    • Monitoring
    • Infiltration/Inflow
    • Metering
    CV Available Upon Request

    View Mr. Dutill's Consulting Profile.
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    Lorne G. Everett, PhD, DSc
    3700 State Street. Suite 350
    Santa Barbara CA 93105
    USA
    phone: 805-880-9301 (Direct) or 805-880-9300 (Office)
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    Lorne Everett Associates Expert Photo


    Lorne G. Everett, PhD, DSc, CGW, PH, PH-GW, BCES, HON.D.WRE, FASCE, FAWRA, FASTM, is an Environmental Consultant with over 40 years of experience in site characterization and remediation of Soils and Groundwater.

    Background - Dr. Everett served as the Chief Scientist at Haley & Aldrich, Shaw Environmental, ARCADIS, and Metcalf & Eddy Inc. He is a retired Professional Researcher (Level VII) in the Bren School of Environmental Science & Management at the University of California at Santa Barbara (UCSB) and Past Director of the Vadose Zone Monitoring Laboratory at UCSB. The University of California describes full professor Level VII as “reserved for scholars of great distinction.”

    Dr. Everett is an internationally recognized expert who has conducted extensive research on Subsurface Characterization and Remediation. He is Chairman of the ASTM Task Committee on Groundwater and Vadose Zone Monitoring. He also chaired the Remediation Session of the First USSR/USA Conference on Environmental Hydrogeology (Leningrad, 1990).

    Dr. Everett has received numerous awards, published over 150 technical papers and reports, holds several patents, developed 11 national ASTM Vadose Zone Monitoring standards and authored and edited over 10 books including: Vadose Zone Monitoring for Hazardous Waste Sites, and Subsurface Migration of Hazardous Waste. His book entitled, Groundwater Monitoring was endorsed by the Environmental Protection Agency (EPA) as establishing “the state-of-the-art used by industry today” and was recommended by the World Health Organization for all developing countries.

    Dr. Everett on Vapor Intrusion


    Litigation Support - Dr. Everett is an expert witness with an established track record in over 80 court cases involving over $2 billion dollars. He provides expert witness services for Toxic Tort Cases, when one or more parties allege health effects and/or property damage from chemicals released to the environment by another party, and Allocation Cases, in which two or more parties disagree over who caused a release to the environment and how much money each party should contribute toward to the cleanup.

    Areas of Expertise:
    • Vapor Intrusion
    • Class Action Lawsuit
    • Personal Injury
  • Toxic Tort
  • Remediation Cost Allocation
  • Property Devaluation
  • View Lorne Everett's Consulting Profile.
    8/3/2017 · Environment
    Starting in the 1940s, the synthetic chemical 1,2,3-TCP or 1,2,3-trichloropropane, was an ingredient in certain soil fumigants that were widely used on farms in California and other states. 1,2,3-TCP is a highly toxic chemical classified as a human carcinogen.

    Lorne G. Everett, PhD, et al
    This compilation of selected technical papers, contains peer-reviewed papers that were presented at a symposium sponsored by ASTM International Committee D18 on Soil and Rock and Subcommittee on Groundwater and Vadose Zone Investigations.
    Lorne G. Everett, PhD, et al
    The book covers subsurface water exchange between the land and sea as well as groundwater discharge to the seas. It also provides a review of experimental methods and numerical modeling that can be used for the evaluation of specific discharge data and the effect of groundwater on the salt balance of seas and oceans.
    Lorne G. Everett, PhD, et al
    This publication provides an international perspective on one of the most complex issues in hydrology: field and laboratory measurement of low permeability and dual porosity materials. Eleven peer-reviewed papers, written by an international group of experts, focus on the development of techniques to evaluate hydraulic conductivity and remediation of fine grained and dual porosity geologic materials.
    Lorne G. Everett, PhD, et al
    Compiled by experienced practitioners, this guide covers topics such as basic principles of vadose zone hydrology and prevalent monitoring techniques. Case studies present actual field experiences for the benefit of the reader. The Handbook provides practitioners with the information they need to fully understand the principles, advantages, and limitations of the monitoring techniques that are available.
    Lorne G. Everett, PhD
    This handbook contains specific information on the application of a widely accepted groundwater monitoring methodology, which has been applied to coal and oil shale development sites.
    Lorne G. Everett, PhD
    Guidelines and Methodology for Developing and Implementing a Groundwater Quality Monitoring Program
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    Rudolph P. Frizzi, PE, GE, D.GE
    Geotechnical Engineering Consultant
    555 Montgomery Street, Suite 1300
    San Francisco CA USA
    phone: 201-398-4613
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    Rudolph P. Frizzi, PE, GE, D.GE is a Civil Engineer with over 25 years of extensive practical Foundation and Geotechnical Engineering experience. Mr. Frizzi has extensive project management experience throughout the United States and internationally, with particular emphasis on:
    • Foundation Design and Construction in Urban Areas
    • Large Scale Land and Waterfront Public and Private Development Projects
    Mr. Frizzi has obtained extensive field, office supervision, and project management experience including soil and rock sampling and in-situ testing; monitoring pre , during, and post-construction with state-of-the-art geotechnical instrumentation; nondestructive testing; aqueous and sub-aqueous inspections and investigations; and heavy construction which has contributed to his practical approach to geotechnical problem solving.

    In addition to his "engineer of record" experience, Mr. Frizzi has provided expert geotechnical consultation and trial testimony on over 50 excavation and foundation litigation cases throughout the United States and internationally. His services are available to attorneys for Plaintiff and Defense.

    Areas of Forensic Expertise:
    • Foundations for Stadiums, Arenas, High-Rise Structures in Urban Areas
    • Embankment and Dam Stability
    • Large-scale Land and Waterfront / Marine Structures and Development
    • Shallow and Deep Foundation Systems
    • Soft and Hard Rock Treatment
    • Earthwork
    • Ground Improvement of Waste Fills
    • Temporary and Permanent Lateral Support Systems for Deep Excavations
    • Geotechnical Instrumentation and Vibration Monitoring
    • Construction Dewatering
    View Rudolph Frizzi's Consulting Profile.
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    Sean Wilson, MS, PG, CEG
    664 W. Broadway
    Glendale CA 91204
    USA
    phone: (818) 539-8408
    fax: (818) 543-4565
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    Sean Wilson, MS, PG, CEG, has over 23 years of experience in performing Geologic and Geotechnical Forensic Engineering investigations. Mr. Wilson currently serves as a Senior Professional Geologist at Shannon & Wilson, Inc. He holds a professional engineering geologist license in California and a professional geologist license in Utah.

    Mr. Wilson has broad experience in numerous industries. He has completed or project managed over a 1,000 forensic evaluations of distressed properties in California, Utah and Oregon for insurance carriers. For the construction industry, Mr. Wilson's work in residential/commercial/public works development projects include trench and drilling exploration, down-hole logging, geotechnical laboratory testing, slope stability analysis, fault trench logging, foundation and keyway observations, fill control, mass grading monitoring. He has also provided planning and environmental impact reports for several cities and counties throughout California.

    Litigation Support - Mr. Wilson provides consultation services to attorneys, judges, arbitrators, insurance companies, and others in the evaluation and remediation of soil related distress to structures, earth movement, seismicity, and other matters related to adverse soil, geologic, or hydrologic conditions. His services are available to counsel representing both Plaintiff and Defendant.

    Areas of Expertise:
    • Forensic Investigations
    • Damage Causation Evaluations
    • Geologic and Geotechnical Investigations
    • Landslide Investigations and Mitigation
    • Geologic Hazard Assessments
    • Environmental Impact Report (EIR) Preparation
    • Environmental Planning
    • Observation and Monitoring of Engineered Grading and Construction Projects