Professional Staff Resumes

Dale T. Littlejohn, CAPM

Dale T. Littlejohn

Gilbert J. Van Deventer


Dale Teague Littlejohn, PG, CAPM
Senior Geologist / Project Manager

Employment History:

Education and Relevant Credentials:


Mr. Littlejohn has 30 years of professional experience in the environmental and petroleum industries. He specializes in the risk-based characterization and fate & transport modeling of contaminants through the vadose zone soil, and groundwater. He is also experienced in environmental compliance, property transfer, oil field damage assessments, and remediation. He possesses significant experience associated with the assessment of underground storage tank (UST) sites, natural gas gathering, compression, and treatment facilities, and crude oil production, transmissions systems, and refining facilities

Once the gas gathering systems were acquired, Mr. Littlejohn conducted Phase III site assessments and based-risk assessments on the facilities identified as requiring further corrective actions. The results of the risk assessments were used to justify limited remedial actions, establishment of institutional controls, and regulatory closure.



Gilbert J. Van Deventer, PG, REM

Senior Project Manager / Hydrogeologist / Partner


Sr. Project Manager/Partner: Trident Environmental, 2001 - present

Sr. Project Manager: TRW Inc.–Environmental Services Unit, 1999 – 2001 (acquired by Trident)

Project Manager: BDM International, Inc., 1996-1998 (acquired by TRW)

Project Manager: Geoscience Consultants, Ltd., 1994-1996 (acquired by BDM)

Project Manager: CURA, Inc., 1991-1994

Environmental Consultant (self-employed), 1990-1991

Hydrologist: USGS-Water Resources Division, 1988-1989

Senior Geophysical Technician: Century Geophysical Corporation, 1980-1988


B. S., Geology, University of Michigan, Ann Arbor, 1979

Other Environmental Science and Groundwater Hydrology course work (Graduate Level):

Kennedy-Western University, WY (1999-2001)

Oklahoma State University, Stillwater, OK (1990)

Wright State University, Dayton, OH (1989-90)

Other Relevant Credentials:

Registered Environmental Manager, NREP (REM No. 5238)

State of Texas Board of Professional Geoscientist (PG No. 3678)

LPST Corrective Action Project Manager

40-Hour OSHA Health and Safety Training for Hazardous Waste Operations, 1979

OSHA HAZWOPER Refresher Training (current certifications)

Confined Space Entry (Supervisor) Training

Radioactive Materials and Radiation Safety Training

Hydrogen Sulfide Safety Training

First Aid/CPR/BBP Certification

Contact Information:

Gilbert J. Van Deventer, PG, REM
PO Box 12177
Odessa, Texas 79768-2177
Phone: 432.638.8740
Fax: 413.403.9968


Mr. Van Deventer has over 30 years of experience in the environmental services industry. He is currently a partner and senior project manager with Trident Environmental serving various petroleum industry clients. He has broad experience in the numerous facets of environmental business and specializes in characterization and remediation of subsurface groundwater and soil contamination. Mr. Van Deventer is proficient in performing fate & transport modeling of contaminants through the vadose zone soil and groundwater for application to risk-based corrective actions. He also possesses significant experience with environmental compliance audits, property transfer assessments, hazardous waste management, underground storage tank (UST) assessments, and planning, designing, and implementing site characterization and remediation projects. Mr. Van Deventer has a comprehensive knowledge of federal, state, and local regulations and permitting requirements, including RCRA, CERCLA, SARA, CWA, CAA, OPA, TSCA, SPCC, and NPDES.

Other Technical Experience

Environmental Site Remediation

Other Technical Experience