Sanitary Sewer and Misc WWTP Improvements Project

The City of Douglas is seeking bids for a comprehensive sanitary sewer and wastewater treatment plant (WWTP) improvement project. The scope includes replacing gravity sewer lines, upgrading interceptor mains, installing new manholes, resurfacing alleys, replacing concrete catwalks, installing water monitoring equipment, electrical integration, biosolids dredging, fence replacement, and HDPE floating air laterals replacement. Approximately 630 LF of 8‑inch PVC pipe and 1,250 LF of 36‑inch PVC pipe will be installed, with additional ancillary works such as bypass pumping, asphalt and concrete repairs, and site grading. • Replace 8‑inch SDR PVC sewer pipe in Washington ½ Alley (Richards St to Cody St) with new manholes and services. • Install 36‑inch SDR PVC interceptor main from Smylie Rd to the WWTP, including new manholes, surface improvements, seeding, and mulching. • Upgrade WWTP infrastructure: concrete catwalks, water monitoring/SCADA equipment, biosolids dredging, fence and gate replacement, HDPE air laterals, and diffuser sleeves. • Provide site improvements (asphalt, concrete repair, grading, seeding) and ensure bypass pumping capability of 1,000 gpm. • Deliver complete design, construction, and commissioning documentation for the entire scope.