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Geology Expert Witnesses

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David Wilshaw, MS, PG
P.O. Box 783547
Winter Garden FL 34778
phone: 407-342-7737
David Wilshaw, MS, PG has over 31 years of experience in Engineering Geology, Geotechnics and Geo-environmental assessments. Established Britannia Solutions, LLC to provide Sinkhole Neutral Evaluation and expert litigation support service to insurance carriers, policyholders and their respective legal advisers. Mr. Wilshaw offers his services as an expert witness not only with respect to disputed sinkhole insurance claims but also in many other specialized areas of forensic engineering geology, especially 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 and Tennessee and is registered as a Chartered Geologist and Fellow of the Geological Society in the United Kingdom. He is an Adjunct Professor of Earth Science. In the last 8 years, he has been Professional Geologist of Record for over 850 cause of subsidence investigations, carried out in accordance with Florida’s sinkhole insurance statutes, in relation to sinkhole loss claims across Florida, ranging from the Panhandle to the Florida Keys.

Litigation Services Include:
  • Testifying Expert at Deposition over 100 times.
  • Testifying Expert at Trial over 20 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 for over 1,000 cause of subsidence reports relating to claims for sinkhole loss
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James A. Jacobs, PG, CHG, CPG
229 Tewksbury Ave.
Point Richmond California 94801
phone: 510-590-1098
fax: 510-232-2823
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.

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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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Stephen R. Henshaw, PG, President & CEO
Jeff Carnahan, LPG, Vice President & CTO
602 N. Capitol Avenue
Indianapolis IN 46204
phone: 866-888-7911
EnviroForensics® is the leading Environmental Engineering company in the country addressing environmental liabilities and finding funding by locating and bringing to your defense old insurance policies. EnviroForensics® has pioneered and perfected the utilization of Comprehensive General Liability insurance policies as a resource to pay for the high costs associated with Soil and Groundwater Investigations, Remediations, and Legal Defense.

Litigation Support –EnviroForensics®' tenured team of experts, ranging from defense attorneys to plaintiff attorneys, have served the legal community on over 100 matters. They investigate and provide defensible data to lawyers who must meet the demands and requirements of litigation and settlement, insurance claims coverage, and governmental regulations.

EnviroForensics® provides environmental assessment and due diligence services for commercial and residential developers, property management companies, real estate investment trusts, brownfield developers, financial institutions, law firms, and governmental agencies.

EnviroForensics® has provided testifying and non-testifying expertise on the following issues:
  • Geology
  • Geochemistry
  • Soil and Groundwater Investigations
  • Environmental Risk Assessments
  • Environmental Engineering
  • Vapor Intrusion
  • Environmental Impact Studies
  • Clean Water Act Violations
  • Stephen Henshaw Environmental Forensics Expert PhotoStephen R. Henshaw, PG, President, CEO, serves as client manager and technical manager on numerous high profile and complex projects involving soil and groundwater quality impacts, permitting, and hazardous waste handling and management practices. He provides technical direction and supervises a staff of geologists, engineers, hydrogeologists, and scientists on projects associated with site characterization, remedial design, remedial implementation, waste-to-energy, system operation, facility management, document management, and litigation support.

    Mr. Henshaw has over 30 years of experience, specializing in asset management, legal and forensic support, regulatory compliance, soil and groundwater investigations, waste-to-energy, planning and permitting, and the design and operation of remediation systems, human health and ecological risk assessments, and insurance coverage of long tail liabilities. He has experience in a variety of geological settings including alluvial deposits, fractured bedrock, glacial outwash, wetlands, and landslides.

    Mr. Henshaw’s expertise includes a strong knowledge of industrial operations, past and current industry practices and procedures, fate and transport of chemicals in soil, soil gas and groundwater, and regulatory compliance and permitting. He has worked as a testifying expert on behalf of innocent landowners and facility operators at several sites impacted by past industrial activities and continues to provide technical and litigation support on RCRA and CERCLA cost recovery matters.

    Jeff Carnahan Environmental Forensics Expert PhotoJeff Carnahan, LPG, VP, CTO, is a Licensed Professional Geologist (LPG) with over 18 years of environmental consulting and remediation experience. Mr. Carnahan's expertise has focused on the investigation and interpretation of subsurface releases of hazardous substances for the purpose of evaluating and controlling the risk and cost implications to his clients.

    While managing sites ranging in size from retail gas stations and dry cleaners to large manufacturing facilities, Mr. Carnahan has amassed extensive experience working with releases of chlorinated solvents within voluntary and enforcement cleanup programs for various State agencies and the U.S. EPA.

    Throughout his career, Mr. Carnahan has provided technical support to the legal community regarding the cause, origin, transport, and potential cost of environmental releases. Additionally, Mr. Carnahan has over 14 years of experience in the investigation and mitigation of vapor intrusion issues and leads the EnviroForensics®' team of full-time VI experts. His distinctive expertise, experience, and forensic talents make Mr. Carnahan a valued strategic partner for his clients on environmental contamination and liability issues.

    View EnviroForensics'® Consulting Profile.
    10/12/2016 · Environment
    Vapor Intrusion (VI) has become a routinely addressed environmental exposure issue within the past few years. Especially at sites where a spill of Tetrachloroethene (PERC) or Trichloroethylene (TCE) has occurred. Many state environmental agencies have provided guidance on dealing with VI issues, and now the US EPA has recently finalized their guidance for use at federal sites. In prior years, however, assessment of the VI exposure pathway was often excluded from a site's investigation and remediation process. Since VI was not really on the regulator's radar, many sites achieved closure without VI having been evaluated. As VI has become a routine part of environmental investigations, regulatory agencies are now beginning to reassess closed sites to see if VI exposure issues have been inadvertently missed. Very recently, it has been reported that the Indiana Department of Environmental Management (IDEM) has joined other states in reopening closed sites that warrant further assessment for VI risk.

    8/17/2016 · Geology
    The question is often posed, "How much will it cost to clean up contamination at a drycleaner?" Invariably the answer is, it depends. Factors that come into play include, but are not limited to, the concentration of VOCs present in the subsurface, whether or not the groundwater is impacted, the depth to groundwater, how far the contamination has spread, whether the cleanup will be focused on residential or commercial land use, and the type of geology and stratigraphy underlying the site. This article focuses on how clayey soils affect cleanup considerations.

    6/21/2016 · Environment
    The fundamental, hard-fast goals of a subsurface remediation project are to stop any current human or ecological exposure; and to avoid any potential future human or ecological exposure. Here are some of the basic concepts and economic considerations used to determine effective site cleanup strategies to attain regulatory closure at contaminated sites.

    5/5/2016 · Environment
    Selecting an environmental consultant can be a daunting task and for small business owners that do not have day-to-day exposure with soil and groundwater contamination it's very difficult to know the difference between consultants. This article is meant to shed light on the differences between environmental consultants and to present the different methods for selecting an environmental consultant. It's my goal to show people that selecting the right consultant for your situation is a very important decision and should not be taken lightly. If a business person doesn't know that there are differences between environmental consultants, countless hours and dollars may be wasted, projects could drag on and site closure could be a distant glimmer.

    3/1/2016 · Environment
    Vapor Intrusion, or VI, occurs when contamination beneath the ground emits toxic vapors that can travel through the soil and enter the interior spaces of houses and buildings. The types of contamination most commonly associated with VI concerns are industrial solvents like chlorinated volatile organic compounds (CVOCs), and petroleum products like gasoline. The Environmental Protection Agency just released final guidance on vapor intrusion issues, which regulates how inhalation exposures from VI are assessed and controlled.

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    David L. Mitchell
    P.O. Box 70
    Dayton TX 77535
    phone: 936-257-1633
    fax: 936-258-4237
    David MitchellGEO Associates provides litigation support services and expert witness testimony for civil and criminal investigations and insurance industry cases (both plaintiff and defendant) that involve Groundwater Pollution and Data Analysis, Forensic Geology and Geophysics, Hydrology Modeling, and Forensic Meteorology including Weather Event Re-Construction and Force Majeure cases. GEO Associates can assist attorneys and insurance claim professionals in obtaining, analyzing, modeling, and interpreting the correct geophysical/geological and meteorological data for their case.

    GEO Associates uses the latest approved Regulatory EPA and USGS numerical modeling software to map the concentration levels and transport of air and groundwater pollutants. GEO Associates numerical modeling expertise, combined with their advanced knowledge of meteorological, geophysical and geological data gathering and processing, provides strong support to the attorney and client for cases involving Air Pollution, Reduced Visibility, Severe Storms, Groundwater Contamination, Flooding, Wind Damage and Hazardous Material Spills and Releases to Air and/or Water, which result in accidents, contamination of aquifers, toxic air, property damage, personal injury and death.

    Services Include:
  • Forensic Geology
  • Industrial Groundwater Pollution
  • Toxic Tort Strategy
  • Environmental Surface and Groundwater Pollution
  • Mapping of Surface and Groundwater Contamination
  • Forensic Hydrology
  • Groundwater Computer Modeling
  • Aquifer Systems Analysis
  • Hazardous Spill Releases
  • Geological and Geophysical Data Acquisition, Processing and Analysis
  • Geological and Geophysical Mapping of Reservoirs
  • Observational Field Programs
  • Reflection and Refraction Seismology
  • Forensic Seismology
  • Seismic Investigations
  • Oil and Gas Operations and Operator Performance
  • Marine and Land Seismic Operations
  • Value Analysis of Proprietary Geophysical and Geological Data
  • 2D and 3D Reflection Seismology Modeling and Analysis
  • Fluid Dynamics and Reservoir Analysis
  • Toxic Fluid Migration
  • Class Action and Force Majeure Cases
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    Scott Friesen, PE
    Senior Consultant
    Contact Rush Porter, Director of Business Development
    8330 Juniper Creek Lane
    San Diego CA 92126
    phone: 858-587-2874
    fax: 858-587-6749
    Scott Friesen Energy Engineering Expert PhotoScott Friesen, PE, is a licensed Professional Engineer in California, Florida, Arizona, Hawaii, Mississippi and two Canadian provinces (Alberta and Manitoba), and is LEED Accredited (CaGBC) and certified as an Energy Manager. Scott has more than 14 years of experience in Design and Construction of HVAC, Plumbing and Building Energy Conservation, System Design, Construction and Forensic Analysis. He has also performed commissioning, energy audits and was involved in marketing and business development.

    Scott's responsibilities at Ivey include design and forensic analysis of HVAC, plumbing, fire protection and energy management systems. He performs site inspections, testing, research, product analysis, cost estimating and is responsible for writing reports and testifying in depositions, hearings and trials.

    Scott is a member of Association of Professional Engineers, Geologist, Geophysicists of Alberta (APEGGA), American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE), Association of Energy Engineers (AEE) and Canadian Green Building Council (CaGBC).

    Experience (partial listing):
    • Approximately 75 HVAC, fire protection and plumbing design projects
    • Approximately six design error and omission expert engagements
    • Approximately 20 residential construction defect expert engagements
    • Approximately 16 commercial construction defect expert engagements
    • 10 LEED design projects
    • 8 HVAC and plumbing commissioning projects
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    Lorne G. Everett, PhD, DSc
    3700 State Street. Suite 350
    Santa Barbara CA 93105
    phone: 805-880-9301 (Direct) or 805-880-9300 (Office)

    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.
    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
    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.