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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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    Chuck Dutill, PE
    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., 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 nationwide for over 35 years. Approximately 50% of his expert witness services have been for defendants and about 50% also for plaintiffs.

    He has issued more than 105 expert reports, been deposed approximately 30 to 35 times, and testified in court (including jury and non-jury trials) approximately 25 to 30 times. 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
    • Stormwater Management
    • Flooding
    • Drainage
    • Runoff
    • Sewer Systems
    • Sanitary Sewage
    • Wastewater Treatment
    • Septic Systems
    • Backups
    • Overflows
    • Surface Water
    • Groundwater
    • Hydrogeology
    • Erosion
    • Grading
    • Hydraulics
    • Floodplains
  • Piping Systems
  • Wells
  • Mold
  • Soils
  • Air Quality
  • Regulations
  • Combined Sewers
  • Detention
  • Maintenance
  • Inspections
  • Dams
  • Sinkholes
  • Hazardous Waste
  • Aquifers
  • Drinking Water
  • Hydraulic Fracturing
  • Health and Safety
  • Standard of Care
  • Toxicity
  • Contamination
  • Spills
  • Pollution
  • Remediation
  • Modeling
  • Storage
  • Sedimentation
  • Hydroplaning
  • Odors
  • Waste Management
  • Wetlands
  • Landfills
  • Water Quality
  • Monitoring
  • Storm Sewers
  • Infiltration/Inflow
  • 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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    Shlomo Orr, Ph.D., P.Eng
    Hydrology / Water Resources Consultant
    5900 W 25th Ave.
    Kennewick WA 99338
    USA
    phone: 509-736-3111
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    Shlomo Orr Hydrology Water Resources Expert PhotoPresident and CEO, Shlomo Orr, Ph.D., P.Eng, has over 33 years of extensive consulting, research, and project management experience in the field of Hydrogeology and Water Resources. He earned a PhD in Hydrology and Water Resources with a minor in Soil and Water Sciences, and BSc and MSc in Civil Engineering.

    Dr. Orr's background includes modeling, planning, and controlling complex subsurface flow and transport phenomena. He has a broad background in conceptual and computational-numerical modeling of fluid flow and solute transport in saturated and unsaturated porous and fractured formations, including stochastic models that account for uncertainties and provide the basis for risk assessment.

    Dr. Orr has taught undergraduate and graduate courses in Groundwater Hydrology, Hydraulic Engineering, and Geostatistics, and advised MS and PhD students (as an Assistant Professor in Civil Engineering, and thereafter). He also taught a course on fluid dynamics in heterogeneous heaps for the Society of Mining Engineering (SME). He has solved some of the most complex problems in his field; has innovated substantially, and has published his advanced works on modeling and optimization in top journals, while serving as a peer reviewer, himself. His toolbox spans from simple analytical models to most detailed, complex, numerical, stochastic 3D models, as well as advanced machine learning models. Dr. Orr has been a reviewer of major books and top journals in hydrology and water resources, and has served in a special committee of SPE (Society of Petroleum Engineers) on Advanced Analytics. He was advising top scientists at the University of Saskatchewan on approaches to Integrated Nuclear Environmental Research and Training (INERT), and he has been serving as a Technical Advisor for SoilVision Systems (an advanced geo-software company). He has done breakthrough modeling work and evaluations of risk assessment models for the NRC (Nuclear Regulatory Commission).

    Litigation Support - Dr. Orr provides expert witness services for cases involving Hydrology, Water Resources, and Environmental Risk. He served as an expert reviewer on advisory boards of the US Army, Air Force, and Navy, on environmental projects. On the other side of the fence, he has conducted major environmental permit applications/investigations for special complex mining operations.

    Dr. Orr's services are available to counsel representing plaintiff and defendant and include site review, written reports, depositions, and trial testimony as needed.

    Areas of Expertise:
  • Hydrogeology & Geohydrology
  • Groundwater Contamination
  • Subsurface Flow & Transport Modeling
  • Aquifer Remediation
  • Soils and vadose zone hydrology
  • Oil and Gas (multiphase flow)
  • Petroleum Hydrocarbons
  • NAPL and DNAPL
  • VOC transport
  • Acid Mine Drainage
  • Seepage
  • Drainage
  • Wellhead Protection
  • Soil Vapor Intrusion
  • Dewatering / Depressurization
  • Landfill Monitoring
  • Geostatistics and stochastic modeling
  • Monte Carlo Simulations
  • Risk-Assessment
  • Geothermal, Fracking, and Waste Injection


  • View Dr. Orr's Consulting Profile.
    6/26/2017 · Hydrology
    This report is the third (and final) report in a series that addresses issues related to hydrologic uncertainty assessment at decommissioning sites. Analyses in the first two reports in this series emphasized the application of relatively simplified models of subsurface flow and transport. Because of their relative computational speed, such simplified models are particularly attractive when the impact of uncertainty in flow and transport needs to be evaluated. These same simplifications, however, have the potential to provide unrepresentative estimates of dose and its uncertainty. Such misrepresentation may have important consequences for decisions based on the dose assessments. The significance of this concern was evaluated by comparing results from uncertainty assessments conducted on a test case using a simplified modeling approach and a more complex/ realistic modeling approach.

    5/9/2017 · Hydrology
    Flow in heaps and dumps is essentially a two-phase flow phenomenon, though for many applications it could be simplified as unsaturated flow. Unlike saturated flow (typical of groundwater flow) where permeability is independent of other hydraulic parameters, unsaturated flow permeability depends on the degree of saturation and/or on capillary pressure. Several recent field studies suggest that flows in heaps and dumps tend to concentrate in preferred pathways, bypassing much of the ore. Different preferential flow phenomena are triggered, promoted, and influenced by different heap structures, by pretreatment, by the composition of the leach solution, and by application rates and schedules. The structure of heaps and dumps is determined and affected by each and every stage of their construction - from blasting to crushing to conveying and stacking of the material.

    5/8/2017 · Hydrology
    In our 1st article (Orr, 2000), we investigated different flow and transport phenomena that could significantly reduce leaching recovery. The combination of such understanding with advanced flow and transport modeling establishes the link between cause and effect, thereby directing operators to optimal design and construction of new heaps. Modeling of flow and transport in heaps could also point to a unique change in application method or rate that would maximize leaching enhancement of an existing heap under existing situation and leaching history. The use of such a model is cost effective in that it can simulate multiple scenarios of alternative leaching enhancement methods. By simulating a large number of irrigation scenarios, such a model can point to optimal and/or most promising alternatives for a particular heap.

    2/8/2017 · Hydrology
    Despite remarkable new developments in stochastic hydrology and adaptations of advanced methods from operations research, stochastic control, and artificial intelligence, solutions of complex real-world problems in hydrogeology have been quite limited. The main reason is the ultimate reliance on first-principle models that lead to complex, distributed-parameter partial differential equations (PDE) on a given scale. While the addition of uncertainty, and hence, stochasticity or randomness has increased insight and highlighted important relationships between uncertainty, reliability, risk, and their effect on the cost function, it has also (a) introduced additional complexity that results in prohibitive computer power even for just a single uncertain/random parameter; and (b) led to the recognition in our inability to assess the full uncertainty even when including all uncertain parameters.

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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