Senior Hydrogeologist

Ensafe • San Diego, CA

119d • $75 - $165

About The Position

EnSafe is seeking a part-time Senior Hydrogeologist to join our team of environmental professionals working on complex and rewarding projects across the country based out of any of EnSafe's offices listed: San Diego, CA. EnSafe is an employee-owned global environmental consulting and engineering firm. We strive to provide cutting-edge, creative solutions for our clients. EnSafe specializes in custom solutions in Environmental Management and Planning, Civil Design Engineering, Environmental Restoration, Natural & Water Resources, Health & Safety, and Technology, with offices operating within the U.S.

Requirements

• Bachelor's or Master's degree in Hydrology, Hydrogeology, Geology, Engineering, or a closely related field.
• CHG highly preferred.
• 15-20 years of professional experience, preferably in environmental consulting.
• Professional Geologist or Engineer licensure (by exam).
• Strong background in hydrogeologic site characterization, groundwater flow and transport modeling and analysis, and environmental remediation/remedy optimization.
• Proficiency with regulatory programs including CERCLA, RCRA, and state-specific programs.
• Demonstrated ability to lead projects and teams, manage multiple priorities, mentor/supervise employees, and communicate effectively with diverse audiences.
• Advanced skills in data analysis, report writing, and preparation of maps, tables, charts, and figures.
• Experience using hydrogeologic modeling tools, including but not limited to MODFLOW, MT3D codes, VISTAS, EVS, etc.
• Excellent verbal and written communication skills.
• Current 40-hour HAZWOPER certification.

Responsibilities

• Designing, directing, and executing complex site investigations, including the planning and implementation of drilling, geophysical logging, aquifer testing, sampling of various media, and installation of monitoring and recovery wells.
• Leading project teams in developing conceptual site models and conducting contaminant fate and transport evaluations.
• Managing and overseeing field activities, ensuring health and safety compliance, subcontractor coordination, and efficient scheduling.
• Interpreting hydrogeologic data and synthesizing field and analytical results to support reporting, risk assessments, remedial design, and regulatory decision-making.
• Practical use of advanced groundwater models to support site characterization and remediation/optimization strategies.
• Writing and reviewing technical reports, work plans, sampling plans, and standard operating procedures (SOPs).
• Serving as a technical advisor, mentoring junior staff, performing quality control reviews, and helping the next generation of hydrogeologists grow.
• Interfacing with clients and regulatory agencies as a subject matter expert, providing strategic guidance, presenting findings, and supporting negotiations.
• Performing optimization of passive and active remedial alternatives, including LTM.
• Building, calibrating, and validating analytical and numerical soil, groundwater, surface water, sediment, and indoor air (attenuation) modeling.
• Providing litigation support for discovery, affidavits, deposition, and trial.
• Performing sequence stratigraphy evaluations and reporting.
• Performing statistical evaluations, background studies, and associated reporting.
• Travel up to approximately 30% may be required, including occasional overnight trips.

Benefits

• Employee-owned company
• Opportunities for continuous learning and professional growth
• Focus on high ethical and safety standards

What This Job Offers

• Job Type: Part-time
• Career Level: Senior
• Industry: Professional, Scientific, and Technical Services
• Education Level: Master's degree