Walnut Creek Primary Clarifier-Flow Equalization Basin Rehab RFQS 6100 CLMA047. Walnut Creek Wastewater Treatment Plant (WWTP) is permitted to treat and discharge an average daily flow of 75 million gallons per day (MGD) and a 2-hour peak flow of 165 MGD. Treated plant effluent is discharged into the Colorado River. A portion is used for non-potable water (NPW) on the plant site and supplies much of the City's growing Water Reclamation Initiative (WRI) program. Primary Treatment Complex No. 1 is original to the 1977 construction, and Primary Treatment Complex No. 2 was added in the late 1980s. The purpose of this project is to rehabilitate and make improvements to the Primary Treatment Complexes (PTC) at Walnut Creek WWTP. Each Primary Treatment Complex consists of two trains of primary clarifiers and in-line flow equalization basins (FEBs). Raw wastewater flows through the primary clarifiers, then continues to the in-line FEBs. Settled wastewater is pumped to secondary treatment, and primary sludge is pumped to Hornsby Bend Biosolids Management Plant. Most of the mechanical and other components in PTC No. 1 and No. 2 are beyond their useful life. PTC1 and PTC2 each has two (2) trains, consisting of a primary clarifier and an FEB. Each primary clarifier has one (1) mechanism, and each FEB has two (2) mechanisms, for a total of four (4) primary clarifier mechanisms and eight (8) FEB mechanisms. The primary clarifiers and FEBs are located in underground structures with limited access. There are skylights located above each clarifier drive for maintenance access and there is pedestrian access at either end of each PTC. Work may require use of large cranes and modification to roof structures. *The list of planholders and/or interested bidders is not being tracked by the stakeholders involved with this project. If you are an interested contractor and wish to be listed as a bidder, please notify our editorial staff at addtobidlist@constructconnect.com.
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