About Us At Onterris, we build careers grounded in purpose, responsibility and real-world impact. “For Planet and Progress” is our north star that guides everything we do. We believe environmental responsibility and human progress are interconnected, interwoven and international. Our scientists, engineers, field teams, consultants and professionals collaborate across disciplines and geographies, guiding industries and governments, ensuring that communities and environments thrive. When you join us, you’re not just forging a career, you’re joining a movement. A movement for better thinking, smarter solutions and lasting impact. Together, we will advance our way of life and protect the integrity of our environment every step of the way. A Day in the Life As a Client Project Manager - Stack, you’ll be responsible for guiding and supporting our team in delivering high-quality service for the stack testing group. This role brings together technical know-how, collaborative leadership, and client engagement to promote compliance, reliability, and strong day-to-day operations. The compensation range for this role is $119k to $155k. To thrive in this role, you’ll be comfortable taking ownership of the following responsibilities: Following established testing methods, procedures, and processes to help support consistent and reliable source testing Assessing client goals, regulatory requirements, and relevant data to craft technical proposals, test plans, and technical reports Managing all technical, financial, and administrative aspects of stationary source testing programs, and projects Determining, overseeing, coordinating, and adjusting project timelines Allocating and directing resources to ensure satisfaction of project goals, timelines, and technical requirements Your Expertise and Skills These requirements reflect the knowledge, skills and abilities that help you do your best work here. 5+ years minimum of stack testing experience and QI credentials Capacity for overnight and local travel for multi-weekday projects up to 75% of the time or more Extensive knowledge in applicable Federal, State and Local regulations Experience managing client relationships and overseeing client projects, including budgeting, and managing project costs High School diploma or equivalent Capability to pass background checks and initial and random drug screening Valid driver’s license Ability to obtain a DOT medical certification and OSHA Respiratory Protection Medical Evaluation Work Environment and Physical Requirements The physical and environmental requirements below reflect what’s typically needed to perform the essential functions of this role safely and effectively. We may provide reasonable accommodations to qualified individuals with disabilities, consistent with applicable law, to support performance of the essential functions. Ability to work in outdoor industrial settings, including climbing to and working on elevated platforms (50ft - 300ft) in accordance with OSHA/ANSI and other applicable safety standards Must be able to exert moderate physical effort, including lifting heavy materials up to 50 pounds Often works outdoors and may be exposed to hot and cold environments and extreme weather conditions, including sunlit, rainy and windy conditions Sitting, standing, and walking #LI-KJ1 Onterris is a leading global environmental solutions company partnering with organizations to solve complex challenges where environmental pressures, regulatory expectations and operational risks intersect. Guided by our mission to advance the way of life without compromising the integrity of our environment, we believe environmental responsibility and human progress are fundamentally connected. Our scientists, engineers, field teams and consultants apply systems thinking that unites science, data and practical expertise to deliver solutions that strengthen our clients’ resilience, mitigate risk and protect the air, water and soil that sustain communities, while uncovering responsible paths forward for planet and progress. For more information, visit www.onterris.com. We are an equal opportunity employer and encourage applications from people of all backgrounds. We acknowledge that these experiences and perspectives help to enrich our teams and contribute to our ongoing success. We are committed to providing access and reasonable accommodation in our employment for all applicants. For US residents, click here to learn more. At Onterris, we take on complex challenges with purpose and momentum, alongside teams that lead with integrity, deliver together, and invest in your growth. "Working with inspiring coworkers and clients across the globe over the past five years has been incredibly rewarding. Their passion motivates me to improve our client experience and work that I deliver." - Erin Peck, Emissions Services “There are not many places where a toxicologist can be boots-on-the-ground at an environmental emergency one day and deep in a human health risk assessment or litigation the next, but this company is one of them, and honestly, that breadth is what makes me love the work. We are a team of scientists with a broad range of talents and experiences who genuinely take the mission to heart, because protecting people and communities from chemical hazards is not abstract here; it is exactly why we show up every day. The culture reflects that shared commitment in the best way: collaborative, rigorous, and truly motivated by the impact we make together.” - Andre Richardson, Consulting “I knew my position here would be more than just a job. Every day is a new, exciting challenge to solve, and I get to go home knowing that the work I am doing is having a positive impact on the world.” - J Esteves, R&D

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