Principal Scientist – Facility Assessment and Indoor ...

Principal Scientist – Facility Assessment and Indoor Environments Grounded in safety, quality, and ethics, our experts lead their fields with dedication and a vision for growth. This role focuses on environmental facility assessments and indoor air quality, including vapor intrusion and inhalation risk, and supports Stantec’s National Risk Assessment and Toxicology Practice. Your Opportunity Stantec is seeking a Principal Scientist to join our collaborative team of Environmental Scientists, Geologists, and Engineers across the US West. This is a high-impact, client-facing role supporting a dynamic and growing Environmental Services team. You will lead complex site characterization and exposure assessment projects with Federal and state oversight, focusing on environmental facility assessments and indoor air quality. Responsibilities Support multi-disciplinary environmental projects with a focus on vapor intrusion, exposure assessment, and inhalation risk. Serve as a senior technical advisor, providing strategic guidance on regulatory compliance and risk mitigation. Design site assessments to determine potential for air/vapor intrusion and interpret data against applicable federal, state, or local air quality and health risk standards (e.g., EPA or ASTM guidelines). Design vapor intrusion mitigation systems (e.g., sub-slab depressurization or venting systems) and provide technical specifications for construction retrofitting of mitigation systems. Evaluate excess cancer risk, hazard index, and cumulative risk using sub-slab and ambient air data and relevant models; demonstrate a strong background in multiple risk evaluation vectors. Prepare technical reports and regulatory submittals for environmental agencies and ensure projects comply with air quality regulations (e.g., CERCLA, RCRA, or state programs); communicate findings to clients, regulators, and stakeholders. Lead and/or participate in regulatory meetings to defend sub-slab and ambient air analytical data, risk modeling results, and technical reports. Stay current on vapor intrusion science, tools, remediation technologies, and regulatory guidelines; contribute to developing best practices or SOPs for Stantec. Support business development by building client relationships and identifying new project opportunities. Ensure projects are delivered on time, within scope and budget, and with high technical quality. Mentor junior staff and contribute to thought leadership within Stantec. Qualifications 15+ years of environmental consulting experience, including extensive work on complex site investigations and regulatory compliance. Proven experience managing projects under Federal and state regulatory frameworks, particularly in California, Texas, Washington, Michigan, and Oregon. Strong technical writing skills with experience preparing and reviewing high-quality reports that interpret field data and analytical results. Exceptional client communication and relationship-building skills. Prior experience supporting or leading technical teams in vapor intrusion, air quality, or toxicology. Must have a valid driver’s license (with REAL ID) and a good driving record. A medical physical and/or drug and alcohol screening may be required for some project assignments. Education: Bachelor’s degree (Master’s preferred) in Environmental Science, Engineering, Geology, Hydrogeology, or related field; 15+ years related experience. About Stantec Stantec is a global leader in sustainable engineering, architecture, and environmental consulting. We foster diverse perspectives and collaboration to solve critical issues in climate change, digital transformation, and infrastructure resilience. Additional Information Pay ranges and benefits are location-dependent and provided where required. This description is not a comprehensive listing of duties and responsibilities and may be updated as needed. Primary Location: United States | WA | Bellevue Travel: Yes Job Posting: 08/09/2025 EEO statement: Stantec is an equal opportunity employer. We prohibit discrimination on the basis of race, color, religion, sex, national origin, age, marital status, genetic information, disability, sexual orientation, gender identity or gender expression. Reasonable accommodations are available during the recruitment process. #J-18808-Ljbffr

Created: 2025-10-08