Design-Assist Construction of the Dry Creek Wastewater Treatment Plant Expansion Project - Packages A and B

The City of Roseville is soliciting a design‑assist construction contractor to deliver Packages A and B of the Dry Creek Wastewater Treatment Plant Expansion. Package A rehabilitates and upgrades Aeration Basins 300 and 400 to restore secondary treatment capacity, while Package B upgrades Aeration Basins 500‑800, associated blowers, pumps, controls, and adds RAS chlorination, hydrocyclone, and external carbon feed systems. The contractor will work collaboratively with the City’s Environmental Utilities staff and the design consultant (Hazen & Sawyer) under a competitive‑negotiation process, providing construction services and continuing design development through the design‑assist model. Mandatory pre‑bid conference and job walk are required. Proposals are due Oct 8, 2026. • Scope includes demolition, civil/structural work, mechanical, electrical, and instrumentation upgrades for two plant packages. • Design‑assist model: contractor contributes constructability input while the design consultant completes 100 % design. • Project funded by the South Placer Wastewater Authority; anticipated to increase secondary treatment capacity for the region. • Required compliance with prevailing‑wage rules and California contractor registration. • Delivery of sealed hard‑copy or electronic proposals to City Clerk; mandatory pre‑bid attendance on Sep 8, 2026.