Mid-Level Hydrogeologist

GSI Environmental•Missoula, MT

About The Position

GSI Environmental is seeking a Mid-Level Hydrogeologist / Groundwater Modeler to join its growing mining team. The role focuses on applying hydrogeologic fundamentals, numerical modeling, and data analysis to complex mine-water problems in collaboration with hydrogeologists, engineers, geochemists, and permitting specialists on projects in the U.S. and internationally. The successful candidate will develop conceptual hydrogeologic models; build, calibrate, and apply numerical groundwater-flow and contaminant-transport models; evaluate mine dewatering, seepage, groundwater impacts, and closure conditions; and communicate model results through technical reports and client-ready presentations. The role also supports hydrogeologic field programs, project coordination, and integration of modeling into mine planning, permitting, operations, and closure evaluations.

Requirements

B.S. or higher in hydrogeology, geology, hydrology, civil/environmental engineering, water resources, or a related field.
Approximately 4 to 10 years of relevant professional experience.
Demonstrated experience developing or supporting numerical groundwater models using MODFLOW, MODFLOW-USG, MODFLOW 6, Groundwater Vistas, or similar tools.
Strong understanding of groundwater-flow principles, hydrostratigraphy, conceptual site models, model calibration, sensitivity analysis, and water budgets.
Experience analyzing hydrogeologic datasets and preparing technically defensible reports, figures, and presentations.
Strong data-management skills and proficiency with Microsoft Excel.
Experience with GIS.
Excellent organizational, verbal, and written communication skills.
Ability to manage multiple tasks, work independently, and collaborate effectively with multidisciplinary teams.
Valid driver’s license and ability to travel domestically for fieldwork and project meetings.

Nice To Haves

M.S. degree.
Relevant professional experience in environmental consulting, mining hydrogeology, or groundwater modeling.

Responsibilities

Develop and refine conceptual hydrogeologic models using geologic, hydraulic, groundwater-level, pumping, recharge, climate, and water-quality data.
Build, calibrate, document, and apply numerical groundwater-flow models using MODFLOW-family codes and common preprocessing and postprocessing platforms.
Perform predictive simulations for open-pit and underground mine dewatering, depressurization, pit inflow, seepage, groundwater drawdown, recovery, closure, and long-term water-management scenarios.
Support contaminant-transport and groundwater-quality evaluations.
Perform model calibration, sensitivity and uncertainty analyses, water-budget evaluations, and scenario comparisons; support parameter estimation using PEST or similar tools.
Develop and maintain efficient model workflows using Python/FloPy, R, GIS, databases, and other data-management or visualization tools.
Support hydrogeologic field programs, including drilling, monitoring-well installation, aquifer testing, packer testing, groundwater monitoring, and data collection.
Interpret aquifer-test and monitoring data and integrate results into project conceptual models and numerical-model inputs.
Prepare technical memoranda, modeling reports, figures, tables, proposals, and presentations with limited senior-staff oversight.
Coordinate with geochemists, hydrologists, and permitting specialists to integrate groundwater modeling into mine planning, permitting, operations, and closure evaluations.
Communicate modeling assumptions, limitations, uncertainty, and results to project managers, clients, and regulators.
Support project management, including scope development, budgeting, schedule tracking, and coordination with internal staff and subcontractors.