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Zach Maassen, PE, PMP is a Water/Wastewater Engineer at HDR, focusing on project delivery and municipal infrastructure design in Montana since October 2023. Previously, Zach served as Chief Operating Officer at FAIR Environmental and F12 Centrifuge Service, overseeing operations and strategic growth initiatives. With experience as General Manager at HD Energy Services LLC, Zach led business development in several industries, while at BOS Solutions, Zach managed engineering and field operations, ensuring safety and data analysis on numerous projects. Earlier roles involved environmental compliance, project management, and engineering functions at various companies, including Water & Environmental Technologies. Zach holds a Bachelor's Degree in Environmental Engineering from Montana Technological University.