Groundwater Modeler (3953)

Navarro Research and Engineering is recruiting a Groundwater Modeler (3953) in Las Vegas, NV.

Navarro Research & Engineering is an award-winning federal contractor dedicated to partnering with clients to advance clean energy and deliver effective solutions for complex challenges in the nuclear and environmental fields. Joining Navarro means being a part of an exceptional team committed to quality and safety while also looking for innovative strategies to create value for the client's success. Headquartered in Oak Ridge, Tennessee, Navarro has active programs in place across the nation for DOE/NNSA, NASA, and the Department of Defense.

Position Summary

Navarro is seeking a Groundwater Modeler with EarthVision experience to support groundwater modeling activities for the Nevada National Security Site (NNSS). This full-time, long-term position will be based in Navarro's Las Vegas, Nevada office and will support technical modeling, data evaluation, and visualization efforts associated with groundwater systems at NNSS.

The Groundwater Modeler will develop and apply MODFLOW-based groundwater models, integrate hydrogeologic and geologic datasets, and support technical analyses used to evaluate groundwater flow conditions, radionuclide contaminant transport, model performance, and site-specific environmental decision-making. The role requires strong technical judgment, attention to quality, and the ability to communicate modeling assumptions, methods, and results clearly to technical and project stakeholders.

Responsibilities

• Develop, maintain, calibrate, and document groundwater flow and contaminant transport models for NNSS using the MODFLOW suite of tools.
• Use EarthVision to develop, visualize, and interpret geologic and hydrogeologic data, including stratigraphic surfaces, model layers, and conceptual site model elements.
• Compile, review, and evaluate groundwater, geologic, hydrologic, hydraulic, contaminant concentration, and site characterization data to support model development, calibration, and refinement.
• Prepare model input files, boundary conditions, hydraulic parameters, stress packages, calibration targets, model outputs, and supporting technical documentation.
• Evaluate model results, perform sensitivity checks, assess uncertainty, and support interpretation of groundwater flow conditions and site-specific hydrogeologic behavior.
• Generate maps, figures, cross sections, tables, model visualizations, and technical summaries to support project deliverables and client communications.
• Coordinate with hydrogeologists, geologists, engineers, environmental scientists, project managers, and client representatives to align modeling activities with project objectives, schedules, and quality requirements.
• Apply appropriate quality assurance, configuration control, data management, and technical review practices for modeling files, datasets, calculations, and deliverables.
• Support technical reports, presentations, work planning, and project meetings related to groundwater modeling and environmental support activities at NNSS.