HydroGeoLogica, Inc. was formed by Anita Johnson in Golden, Colorado in 2006, to provide consulting services in the hydrogeologic sciences. In 2010, Pam Rohal joined HydroGeoLogica, bringing expertise in geochemistry including geochemical characterization and water quality modeling for mining applications. Brent Johnson joined the HydroGeoLogica team in 2015, bringing his extensive experience in aqueous geochemistry and his innovative approaches to managing water quality issues.  Liane George joined us in 2017, along with her solid surface water, groundwater, and water balance modeling expertise.  The newest addition, Erik Guldbech, who joined in mid-2017, brings further geochemistry expertise and has background in GIS analyses.

In addition to our core experts, HydroGeoLogica maintains a network of specialized, associate experts so we can build a focused team to address your mine water and waste issues.


anita johnson

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Anita Johnson is a hydrogeologist with 25 years of professional experience in environmental consulting and mine water management. She is the owner of HydroGeoLogica, Inc, and has worked in Europe, North America, Central and South America, and Asia. 

Anita develops site-specific water balances for industrial, environmental, and mining applications using either visual dynamic systems (GoldSim) or spreadsheets.  She is experienced in the design and implementation of surface water and groundwater investigations and development of water management systems for a variety of sites, primarily mine related. She has extensive experience in aquifer testing design, implementation and analysis, and provides peer review on these subjects.  View Resume


brent johnson

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Brent Johnson has 23 years of professional experience in hydrology, geochemistry, water quality prediction and management. He conducts hydrologic and geochemical studies for all phases of projects including feasibility, permitting, baseline studies, water use optimization, reclamation, and source control.  

Brent is familiar with Equator Principals, the International Cyanide Code, and ICMM’s water guidelines.  He has expertise in hydrogeologic characterization, saturated and unsaturated groundwater flow modeling, seepage modeling for dams and cover/liner systems and he has extensive experience in aqueous geo-chemistry, ARD and metals chemistry, and developing innovative approaches to managing water quality issues.  

Mr. Johnson has worked extensively at sites around the world including Asia, Africa, North and South America, and Europe, from tropical to northern latitude conditions, and he is fluent in English and Spanish. View Resume


pam rohal

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Pamela Rohal is a geochemist with 18 years of experience providing geochemical and hydrogeological technical support, primarily to the mining and environmental industry.

Much of Pam's early project work dealt with mine site remediation projects focused on characterization and treatment of acid rock drainage impacts.

Over the last seven years, her focus has been on geochemical characterization/modeling and evaluating water quality impacts in support of mine permitting and operations; specifically, mine waste geochemical characterization, geochemical modeling of pit lake water quality and mine facility water quality seepage analyses.

In the United States, she has completed projects in Alaska, Arizona, Colorado, Idaho, Michigan, Montana, Nevada, and Wyoming and she has also worked on international projects in Chile, DRC (Africa), Guatemala, Honduras, Indonesia, and Australia.  View Resume


liane george

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Liane George has 12 years of experience in the fields of geology, surface water hydrology, and hydrogeology.  She is both a registered Professional Engineer (Colorado) and Professional Geologist (Utah).

She is a specialist in hydrologic modeling using a variety of computer modeling programs including HEC-HMS for surface water event flow analysis, FEFLOW for groundwater aquifer pore pressure models and GoldSim for water balance and financial analysis modeling. She is an expert in developing site-wide water balances and facility-specific water balances for the mining industry, including tailings storage facilities, leach pads, storage ponds, mills, pit lakes, dewatering/pumping wells, and predictive climate and runoff modeling.  She has taught GoldSim short courses both internally and for clients.  She is an expert FEFLOW user with respect to evaluation of dewatering options for large open pit mines, supporting geotechnical and slope stability analyses.

Her field related experience includes well testing, installation, stream water testing, drill rigs supervision, logging core and geological mapping.  She has worked on projects in the United States, and overseas in Japan, Morocco, and Peru. View Resume


erik guldbech

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Erik Guldbech graduated from Colorado School of Mines in May of 2017 with his Master’s degree in Environmental Geochemistry. Erik received his Bachelor’s degree from Rutgers in Geological Sciences and a graduate certificate from Penn State in Geographic Information Systems. His experience includes geochemical reaction modeling with Geochemist’s Workbench and PhreeqC, unsaturated and saturated groundwater flow modeling, geographic spatial analysis, and cartography. He is familiar with mine site water balances, seepage modeling for dams, cover/liner modeling, and surface water hydrology.

Erik has completed projects in Nevada, Utah and Arizona. His field experience includes water quality testing, well testing, geological mapping, and core logging. He is currently working towards PG and PE certification.

Prior to entering the environmental consulting industry, Erik received a Bachelor’s of Fine Art in 3D animation and worked on film and television sets as a lighting technician. View Resume


mary ellen wickham

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Mary Ellen Wickham is a geoscientist with 17 years of experience in water resources planning, conservation, and hydrogeology.  Her career began in the desert southwest, preserving groundwater resources while developing conservation programs and water policy, and working in regulatory compliance.    Additionally, Mary Ellen has worked on various environmental investigations for water and energy projects, including hydrogeologic characterization, carbon sequestration, coal, and geothermal.  She has been an integral team member in both the public and private sectors providing extensive administrative and technical support. View Resume