The City of Tumwater ("City") is soliciting qualified consultants who can provide complete engineering design, permitting, and construction support services required to extend the City's sanitary sewer line east along Trosper Road. A. Project Description The City proposes to extend City sewer 5,000± feet west along Trosper Road, 1,400± feet north along Joppa Street and numerous yet to be determined stubs, laterals, manholes, and cleanouts along the alignment of the extensions. This area is considered a high priority for septic conversion as Percival Creek is identified as a hot spot for fecal coliform and total nitrogen in the Deschutes River, Percival Creek, Black Lake Ditch TMDL (2018), and the Budd Inlet TMDL (2022). By extending the sewer within this corridor, numerous properties will be able to connect to the City sewer and improve surface and groundwater quality in the Percival Creek subbasin, the highest priority basin within the City. The City has secured funding through the Washington State Department of Ecology’s State Revolving Fund (SRF) loan program. No federal funds are expected for this project. B. Design Scope The City is seeking a qualified consultant to develop a full Plans, Specifications&Estimate (PS&E) packet, and to provide to be determined bidding and construction support services for the Trosper Road Sewer Extension project. All aspects of this project will be managed by the consultant. Final design deliverables need to be ready for construction in summer 2027. All permits must be completed prior to construction. TheCity may ask during the scope and fee negotiations that the work be separated out by phase. Consultants shall understand that the Scope of Work may change due to funding or other unforeseen circumstances. At a minimum, the City is expecting the following items to be included in the scope of services: Data Collection & Design • Survey, Topographic, and Extension Alignment Features • Hydraulic Sewer Basin Analysis as needed for pipe sizing / service basin • Geotechnical and Environmental Analysis/Report for identified critical areas/high groundwater along the alignment.
