GL&S is a small, dynamic firm of consulting geologists, groundwater hydrologists, and scientists with extensive expertise in balancing development with the preservation and protection of our natural resources.

We provide services to the Oil & Gas Industry, Real Estate Construction and development Companies, and Government Agencies.

We bring over 80 years of combined experience in geotechnical, hydrogeological and environmental consulting to bear on your  project. This experience includes strong relationships with  regulators at local, State and Federal levels.

As a small business, GL&S is extremely responsive to your needs and can offer low overhead and reasonable fees.

We have developed strong, functional relationships with several small businesses to provide multi-disciplinary, cost-effective expertise and resources, when required.

About our team

DONALD R. GANSER, P.G. (Rest in peace)

Founding Member

Chief Executive Officer

Principal Hydrogeologist

Don passed away June 22, 2015. He will always be remembered as an outstanding professional, as a loving father and good friend, and as someone who knew how to balance his professional responsibilities with enjoying life.

With all the sadness that his departure has inflicted in his family, friends and colleagues, it is a relief for all of us to know that he lived a rewarding life and left a mark in all of us.

In 2007, Mr. Don Ganser founded Don Ganser and Associates. Don had over 35 years of professional experience in geotechnical and environmental consulting. He marketed, managed, and/or performed geotechnical, ground-water and environmental geological studies for industrial facilities, dams, mines, power plants, railroads, airports and a variety of hazardous waste sites throughout the continental United States and Caribbean. Don holds a Bachelor of Science, in Geology, from the University of Illinois at Champaign-Urbana; and had completed Graduate Studies in Hydrogeology, Groundwater Modeling, Coal and Oil Shale Geology, at the Colorado School of Mines. He was a registered Professional Geologist in the State of Wyoming. His expertise ranged from initial evaluation of ground-water resource potential through investigation and final production well design as well as mine dewatering and impact assessment. His environmental experience includes Phase I and II Environmental Site Assessments, CERCLA and RCRA site characterization and remedial investigations, groundwater modeling, feasibility studies, remedial design and implementation for industry and government, in addition to, permitting, regulatory compliance and consultation to potentially responsible parties concerning contaminated sites throughout the United States. 

In March, 2010, Don Ganser and Carlos Lujan founded Ganser Lujan & Associates, LLC (GL&A) to provide cost-effective expert Environmental, Geology and/or Groundwater Services to industries and government agencies in Colorado, in the U.S., and internationally. During that time, Joel Sobol continued to work closely with Don in most of GL&A projects, as he did for more than 10 years.

In March 2016, Joel Sobol joined the Company as a Member and the name of the company was changed to Ganser Lujan & Sobol, LLC (GL&S).

Carlos A. Lujan, Ph.D.

Managing Director

Dr. Luján has over 28 years of professional experience in the field of groundwater hydrology, and environmental sciences. Dr. Luján has conducted and/or managed assessment and remediation projects for the Oil & Gas and Petroleum industry in the United States and in Central America, as well as groundwater flow numerical modeling for environmental impact studies. Recently, he has been working as a consultant to the Colorado Oil & Gas Conservation Commission assisting with the regulatory review of E&P activities. Dr. Luján holds a M.Sc. and a Ph.D. degree in Groundwater Hydrology, Civil Engineering Department from Colorado State University. He received his Bachelor of Science in Civil Engineering, with a Major in Water Resources at the Andrés Bello University, Venezuela.

He is currently working as a consultant to the COGCC assisting with the regulatory review of spill/release reports, and pit closure, remediation, and reclamation Work Plans related to E&P activities. His expertise ranges from evaluation of groundwater resources, groundwater modeling, site characterization and remediation of midstream and downstream facilities, as well as regulatory compliance to the Colorado Oil & Gas Conservation Commission (COGCC) Environmental Rules.

joelJoel Sobol

Technical Director

As a hydrogeologist and environmental scientist, Mr. Sobol has been involved in the development, evaluation, and remediation of ground water resources for over 35 years. His experience includes hydrogeologic assessment and site characterization, evaluation of ground water availability and supply, dewatering analysis, litigation support for cases with hydrologic and hydrogeologic impacts, and mining related feasibility and acid mine drainage studies. His background is primarily technical and includes a broad range of groundwater, surface water, vadose zone, geochemistry and statistical experience. As part of this background, he has considerable experience in conducting hydrologic studies to characterize the physical and chemical nature of groundwater and surface water systems both in the natural and disturbed environments. These types of studies often require evaluation of sites with complex geologic conditions and scenarios requiring a multi-disciplined approach using hydrology, geochemistry, and statistics.

His modeling capabilities include analytical, numerical flow (MODFLOW), transport modeling (MT3D), and surface water runoff (HEC-HMS) and flood plain (HEC-RAS) modeling. Mr. Sobol also has extensive field experience that includes borehole logging, well installation, aquifer and slug testing, and extensive aquifer and slug test analysis in a wide range of geologic media. In addition, Mr. Sobol has considerable experience in soil, surface and ground water sampling and interpreting borehole geophysical logs.

Mr. Sobol’s background in geochemistry includes conducting research for the mining industry on the physical, geochemical, and biological processes that control the fate and distribution of trace metals in acid drainage environments such as open-pit mine lakes. Mr. Sobol has B.Sc. in Geology and Geophysics from the University of Connecticut and a M.Sc. from the Colorado School of Mines in Environmental Science and Engineering.