Matrix New World Engineering, a part of True Environmental and its partner firms, is seeking a Groundwater Modeler to join our team in Phoenix, AZ. The position will be a part-time position for up to 25 hours per week, with flexibility to work in our Phoenix office or remotely. Matrix is an equal opportunity employer.

Our Arizona Water Services group focuses on hydrogeological and environmental consulting with offices in Phoenix and Prescott, and remote staff located in North and South America. The ideal candidate will participate in groundwater flow and contaminant transport modeling and support hydrogeologic investigations for water resources and environmental consulting projects.

As a Groundwater Modeler, you will support the team by assisting with numerical groundwater model development, data analysis, and technical reporting, gaining hands-on experience in groundwater flow modeling.

• Assist in building, calibrating, and running numerical groundwater flow and transport models using the Modular Finite-Difference Flow Model (MODFLOW), Model Transport in 3 Dimensional (MT3D) and Finite Element Subsurface Flow System (FEFLOW) suites of software or similar platforms
• Support collection, organization, and quality assurance/quality control (QA/QC) of large hydrogeologic datasets such as water levels, aquifer parameters, pumping rates, etc.
• Help prepare model input datasets, grid construction, and boundary condition assignments under senior staff guidance
• Assist with pre-processing of model inputs and post-processing/visualization of model outputs using tools such as Groundwater Vistas processing applications and Groundwater Modeling Systems (GMS) or ModelMuse graphical user interfaces and Geographic Information Systems (ArcGIS Pro)
• Assist with sensitivity analyses and predictive scenario runs
• Support preparation of technical memoranda, model reports, and figures documenting modeling methods and results
• Participate in literature review and data acquisition of site geology, hydrogeology, and regulatory framework considerations
• Collaborate with project teams on groundwater resources projects
• Ensure all work is performed in accordance with project quality assurance and safety protocols

• Education: Working on Bachelor’s or Master’s degree in Hydrogeology, Geology, Civil/Environmental Engineering, or a closely related field

• Academic Experience: Coursework in groundwater hydrology, hydrogeology, fluid mechanics, or numerical methods
• Hydrogeologic Experience: Familiarity with groundwater modeling concepts such as Darcy’s Law and the Theis non-equilibrium equation
• Modeling Experience: Basic exposure to modeling software such as Modular Finite-Difference Flow Model (MODFLOW) suites of software, Groundwater Vistas processing applications or other graphical user interfaces through coursework or self-study
• Support Software: Proficiency in Microsoft Office Suite; experience with data processing applications such as Python, R, or Matrix Laboratory (MATLAB)

• Master’s degree in Hydrogeology, Geology, or Environmental/Civil Engineering
• Previous experience with MODFLOW-family of codes or commercial groundwater modeling graphical user interfaces (GUIs) such as Groundwater Modeling Systems (GMS), Groundwater Vistas and ModelMuse
• Experience with ArcGIS software for spatial data management and figure preparation
• Prior internship or research experience at an environmental consulting firm or regulatory agency
• Ability to work effectively both independently and as part of a multidisciplinary project team
• Strong attention to detail and organizational skills for managing model files and datasets
• Excellent oral and written communication skills