At **APTIM** , we come to work each day knowing that we are making an impact on the world. Our work spans from safeguarding and maintaining critical infrastructure to helping communities recover from natural disasters, from empowering our armed forces and first responders to reducing carbon and energy use, and from making cities more resilient against the threats of climate change to restoring contaminated ecological systems. **Job Overview:** APTIM Federal Services is currently seeking a Sr. Level Hydrogeologist to support projects within our various federal programs. Primary responsibilities will include the planning, implementation, and interpretation of Geologic and Hydrologic investigations for environmental characterization and remediation including preparation of Conceptual Site Models as related to fate and transport of various constituents. Other responsibilities may include preparation of work plans, recommendation and implementation of remedial actions, and completion of final reports. The successful candidate will possess the ability to communicate clearly and confidently, both written and verbally, to all project team members including client representatives, government regulators, and APTIM colleagues alike. Strong people skills with a collaborative demeanor are a must. This position may be based out of our Concord, Irvine, or San Diego office locations. **What you can expect from APTIM:** + Work that is worthy of your time and talent + Respect and flexibility to live a full life at work and at home + Dogged determination to deliver for our clients and communities + A voice in making our company better + Investment into your personal and professional development **Key Responsibilities/Accountabilities:** + Characterize the geologic conditions, structural composition, hydrologic character, contaminant types and distribution to evaluate risks and provide input for the design of appropriate remedial measures. + Design and execute hydrologic testing to determine the hydrologic regime to define the character of groundwater aquifers, their capacity to produce water, their relative isolation and the fate and transport of contaminants (where present). + Utilize groundwater modelling software to construct models, define input parameters, execute, and interpret results to predict future contaminant transport and fate. + Design, perform and interpret tracer tests, tidal studies, single and multiple well pump tests, slug tests, passive flux, and packer testing. + Have solid familiarity with state and federal regulations applicable to environmental investigations. + Communicate field results and recommended course of action to Sr. management, client representatives and regulatory personnel. + Ensure conformance to applicable technical standards as well as company policies and procedures. + Serve as a mentor to junior and mid-level staff; work collaboratively in a team environment. + Always possess a "Safety First" work ethic. **Basic Qualifications:** + Bachelor's degree in Hydrogeology, Geology, or Engineering required. + 15+ years of experience in the environmental field. + Possess current registration as a Certified Hydrogeologist (CHG) in California. + Advanced proficiency with various modeling software including but not limited to Visual Modflow, GMS, Aqtesolv, and Groundwater Vistas required. + Possess 40-hour OSHA HAZWOPER training with current 8-hour refresher certificate preferred. + Must possess a valid driver's license with a clean driving record. + Core competency in Microsoft Office Products, including Word, Excel, and PowerPoint + Strong written and verbal communication skills **Who we are and what we do:** APTIM is a global industry leader headquartered in Baton Rouge, Louisiana. With more than 4,000 employees worldwide, APTIM specializes in critical infrastructure, technical and data solutions, program management, environmental services, resilience, as well as sustainability and energy solutions. Our dedicated people have the proven experience and expertise to provide integrated services and solutions to government agencies, commercial, industrial, and energy customers. APTIM is committed to accelerating the transition toward a clean and efficient energy economy, building a sustainable future for our communities and the natural world, and creating an inclusive equitable environment that celebrates the diversity of our people. Watch our video: Aptim Making a Difference Equal Opportunity Employer Minorities/Women/Protected Veterans/Disabled Applicants with a physical or mental disability who require a reasonable accommodation for any part of the application or hiring process may make their request known by e-mailing HRQuestions@cbifederalservices.com or calling 855.343.5600 for assistance. EOE/Vets/Disability