At BES, we value our customers and partners; Portlanders' sense of connection to their waterways; conscientious stewardship of our watersheds, wastewater and stormwater infrastructure, and financial resources; a diverse, collaborative, healthy, and engaged workforce; leadership among our employees and in our City and community; equity in our workplace, business practices, and service delivery; clear communication and transparency; innovative, sustainable, and resilient solutions. The City of Portland Bureau of Environmental Services (BES) Operations & Maintenance Group (O&MG) A core aspect of the Bureau of Environmental Services' work is in operating and maintaining facilities, this work includes maintaining facilities at two large, complex wastewater treatment plants, 98 pump stations located throughout the city as well as associated ancillary facilities.