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About Us

Established in 1998, Lexington Geoscience provides a variety of environmental consulting services regarding investigation and management of contaminated soil and groundwater.  The principal staff includes David M. Henry and Diane K. Henry, both California Professional Geologists.  A summary of thier experience is provided below.

David M. Henry, PG


Mr. David Henry, a Principle with Lexington Geoscience, has over 38 years of diversified experience including 10 years in oil and gas exploration and 28 years conducting and managing site investigations, remediation, and litigation support for properties with environmental issues.  Mr. Henry is a California Professional Geologist (No. 4525).  He holds a Bachelor of Science Degree in geology from California State University Long Beach and a Master of Science Degree in geology from the University of Wisconsin, Madison.


He has conducted and managed site investigations and remediation at numerous commercial and industrial facilities, manufactured gas facilities, oil fields, retail gasoline outlets and fuel terminals, and an oil refinery.  Contaminates at the various sites have included: chlorinated volatile organic compounds; fuels, fuel additives, lubricants, cutting oils, crude oil, solvents; metals, acids/bases, polynuclear aromatic hydrocarbons, and phthalate plasticizers. Remediation projects included: vapor extraction, free product recovery, in situ and ex situ bioremediation, groundwater recovery and vacuum assisted pumping, neutralization of acid sludges and caustic wastes; and metal fixation/stabilization.


He has implemented and managed several oil field remediation projects in Southern California including the reuse of all oily soil on site.  The remediated oil field sites have been redeveloped as both commercial residential properties. 


Mr. Henry has provided expert witness technical support to legal counsel for variety of environmental issues related to contamination and standards of practice; conducted detailed forensic investigations related to releases of hazardous materials; provided deposition testimony and directed the preparation of computer simulations and trial exhibits.  He provided assistance to the court (judge) on environmental concerns and potential costs of those impacts during a bankruptcy settlement.

Diane K Henry, PG, CHG

Ms. Diane Henry, a Principle with Lexington Geoscience, has over 35 years of diversified experience in conducting and managing geological-related investigations including 25 years of experience with environmental issues. She has managed and conducted a variety of multidisciplinary projects including environmental site assessments; soil and groundwater contamination assessments; remedial investigation and feasibility studies (RI/FS); remedial system design, construction, operation and monitoring; hydrogeology and contaminant transport modeling; risk assessments; and environmental impact reports. These were conducted for Department of Defense, industry, and property development clients. She has also provided consulting for these issues in support of litigation.


These projects include those conducted in accordance with RCRA, CERCLA, as well as under the oversight of regulatory agencies such as the Regional Water Quality Control Boards (RWQCBs), the Department of Toxic Substances Control (DTSC), South Coast Air Quality Management District (SCAQMD), and country health and fire departments. For clients with multiple facilities, she has helped in identifying pertinent issues and prioritizing response actions to most effectively utilize company assets while addressing the issues of concern to regulatory authorities.


Ms. Henry is a California Professional Geologist (No. 4342), and Certified Hydrogeologist (No. 303).  She holds a Bachelor of Science Degree in geology from California State University Long Beach and a Master of Science Degree in geology from the University of Wisconsin, Madison.

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