RFP 23-019 Langdon WWTP new EQ Tank Construction and existing EQ Tank Rehabilitation. - RFP 23-019 Langdon WWTP new EQ Tank Construction and existing EQ Tank Rehabilitation.

The County is seeking proposals to provide engineering services to construct a new Equalization (EQ) concrete tank and to repair an existing EQ concrete tank at the Langdon Wastewater Treatment Plant.

The Plant consists of two Sequencing Batch Reactors and one Moving Bed Biofilm Reactor. The Plant is licensed to treat an average daily flow of 5,300 m3/day and discharges to Weed Lake.

The EQ tank was constructed in 2009 with a design capacity of approximately 640 cubic meters. In July 2023, the County hired CIMA+ to conduct a Conditions Assessment of the tank. The findings were the structural integrity of the tank (concrete, rebar, etc.) has deteriorated to where the lifespan is expected to be less than 5 years.

The proposal is for Professional Services for site investigation, detailed design, project planning, and construction administration. The intent of the project is to provide the most cost-effective design parameters to construct a new EQ Tank and repair the existing EQ Tank.
Completing this project in a timely fashion is critical for the continued undisrupted operation of the plant. The County is anticipating that the award and execution of a professional services contract would in place before the end of 2023. The proponent is to provide expected timelines to complete the tender specifications package for the following stages along with the estimated duration of construction to substantial completion.