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

The City of Roseville is seeking a qualified contractor to provide design‑assist construction services for the expansion of the Dry Creek Wastewater Treatment Plant (DCWWTP) – Packages A and B. Package A focuses on rehabilitating Aeration Basins 300 and 400; Package B includes upgrades to Aeration Basins 500‑800, blower systems, RAS chlorination, hydrocyclone, and external carbon feed. The contractor will work under a design‑assist model, collaborating with the design consultant (Hazen and Sawyer) and city staff to advance the design to 100 % while performing construction. The scope covers demolition, civil/structural work, mechanical, electrical, instrumentation, and commissioning. Proposals must be submitted by Oct 8, 2026, and attendance at the mandatory pre‑bid conference Sep 8, 2026 is required. • Design‑assist construction for two packages (A = Aeration Basin rehab; B = Aeration Basin upgrades & ancillary systems) • Expected to restore secondary treatment capacity and accommodate future growth • Contractor must coordinate closely with city utilities staff and the design consultant • Includes demolition, concrete work, installation of mixers, pumps, blowers, electrical & control systems, and commissioning • Prevailing‑wage project; must be registered to do business in California • Mandatory pre‑bid conference & job walk on Sep 8, 2026 at the plant site • Proposal due Oct 8, 2026 (sealed hard copy or email)