Hydrogeologist & Groundwater Modeler — Ownership Eligible

GSI Environmental Inc.; Missoula, Helena (MT, MT); Remote; USD 80,000 - 110,000; Full time

Benefits offered by this job

Ownership stake

Competitive compensation + bonuses

Remote work flexibility

Conference opportunities

Collaborative culture

Job summary

GSI Environmental Inc. is seeking a Mid-Level Hydrogeologist / Groundwater Modeler to join our growing mining team in Missoula, MT. You will apply strong hydrogeologic fundamentals, numerical modeling, and data analysis to complex mine water problems, collaborating with experienced GSI hydrogeologists, engineers, geochemists, and permitting specialists on projects throughout the U.S.

and internationally. This position emphasizes groundwater modeling, developing conceptual models, calibrating

Qualifications

• Bachelor's degree or higher in hydrogeology, geology, hydrology, civil/environmental engineering, water resources, or related field; MS preferred.
• Approximately 4 to 10 years of relevant professional experience, preferably in environmental consulting, mining hydrogeology, or groundwater modeling.
• Experience with 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; GIS experience expected.
• Excellent organizational, verbal, and written communication skills.
• Ability to manage multiple tasks, work independently, and collaborate with multidisciplinary teams.
• Valid driver’s license and ability to travel domestically for fieldwork and project meetings.

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 pre/post-processing 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 analyses, 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 needed to constrain conceptual and numerical models.
• 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 activities, including scope development, budgeting, schedule tracking, and coordination with internal staff and subcontractors.

Skills

Hydrogeology

Groundwater modeling

Data analysis

Report writing

Education

Bachelor's degree or higher

MS degree preferred

Tools

MODFLOW

Groundwater Vistas

Python/FloPy

GIS

Excel

Job description

GSI Environmental Inc. is seeking a Mid-Level Hydrogeologist / Groundwater Modeler to join our growing mining team in Missoula, MT. You will apply strong hydrogeologic fundamentals, numerical modeling, and data analysis to complex mine water problems, collaborating with experienced GSI hydrogeologists, engineers, geochemists, and permitting specialists on projects throughout the U.S.

and internationally. This position emphasizes groundwater modeling, developing conceptual models, calibrating