The City of Eureka Engineering Department, hereinafter collectively referred to as “City,” is requesting proposals from experienced engineering consultants to provide Construction Management Services during construction of the Elk River Wastewater Treatment Plant (ERWWTP) Wet Weather Improvements Project. The selected consultant will perform services during construction of the project, which is expected to run June 2025 – October 2026. The project requires a new Trickling Filter wet well and pump station to be constructed to handle the peak wet weather flow for 24 Million Gallons per Day (MGD), including three new pumps with Variable Frequency Drives. To accommodate peak wet weather flow of 24 MGD through secondary treatment requires upgrading the return secondary solids pumps to handle increased flows. For two secondary clarifiers, the return secondary solids pumps will be increased to a capacity of 7,500 Gallons per Minute (GPM) with both clarifiers and all four pumps in service A 8 MGD lined equalization basin, will provide storage of excess primary treated flows during peak wet weather events. This requires a primary effluent transfer station with a capacity of 5,600 GPM (8 MGD), an equalization basin Lift Station with a capacity of 5,600 GPM (8 MGD), and yard piping ranging in size between 14 and 20- inch diameters to transfer the excess flow to the equalization basin and back to secondary treatment.
