Groundwater Modeler / Hydrogeologist

True Environmental

About The Position

Matrix New World Engineering, part of True Environmental and its partner firms, is seeking a Groundwater Modeler / Hydrogeologist for its Arizona Water Services group. The position is full-time and based in Phoenix, Arizona, with flexibility to work from the Phoenix office or remotely. The role participates in groundwater flow and contaminant transport modeling and supports hydrogeologic investigations for water resources and environmental consulting projects, under the direction of senior technical staff. The successful candidate will build, calibrate, and apply numerical groundwater flow and solute transport models; perform sensitivity, uncertainty, and predictive analyses; and compile and manage spatial and subsurface data for Conceptual Site Model development. The role also supports regulatory permitting, water-supply applications, managed aquifer recharge and aquifer storage and recovery projects, aquifer testing, technical deliverables, and project management activities. Matrix's Arizona offices work across groundwater flow and transport modeling, water resources, water system engineering, permitting, environmental assessment and remediation, site characterization, drilling programs, and GIS. Full company benefits are offered, with details to be provided during interviews.

Requirements

Bachelor's degree in Geology, Hydrology, Environmental Science, or a related field.
Three years of experience with a master's degree or six years with a bachelor's degree in groundwater modeling, hydrogeology, water resources, or environmental consulting.
Hands-on proficiency with numerical groundwater flow and transport modeling software, including MODFLOW, MODPATH, and MT3D.
Proficiency in GIS, including ArcGIS Pro, and post-processing methods such as Fortran, Python, Grapher, or Surfer.
Groundwater modeling experience and familiarity with groundwater challenges and regulations in Arizona and the arid Southwestern United States.
Strong technical writing and communication skills, including experience preparing technical reports and deliverables.
Ability to prioritize tasks and work efficiently on multiple projects independently and as part of a project team.
Strong attention to detail and organizational skills for managing model files and datasets.

Nice To Haves

Master's degree.
Familiarity with parameter estimation tools such as Parameter Estimation (PEST).
Advanced data processing skills using Python, R, FORTRAN, or script-based programs and dataset management tools.
Experience interpreting complex geologic and hydrogeologic data to develop Conceptual Site Models.
Prior experience supporting field characterization programs, such as well installation, logging, or pumping tests.
Familiarity with pre-processing applications such as Groundwater Vistas.

Responsibilities

Build, calibrate, and apply numerical groundwater flow and solute transport models under the direction of senior technical staff.
Perform sensitivity, uncertainty, and predictive analyses for water resource and remediation modeling projects.
Compile, evaluate, and manage spatial and subsurface datasets, including geologic, hydrogeologic, and water quality data, to support Conceptual Site Model development.
Assist with technical project work supporting regulatory frameworks, including ADEQ permitting programs such as Aquifer Protection Permit and AZPDES permit applications.
Assist with ADWR Assured and Adequate Water Supply applications, including aquifer impact analysis.
Assist with hydrogeologic characterization for managed aquifer recharge sites and aquifer storage and recovery wells, including projected groundwater mounding.
Assist with data collection, aquifer testing analysis, and data interpretation.
Draft technical reports, memos, figures, and technical appendices for project deliverables.
Support Project Managers with cost estimation, proposal preparation, and task management.