Opening of Qualifications - WWTP CSO Tank RFQ Guaranteed Savings Contract Proj No. 121-071-A - Kokosing Ind.

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EVAN SVI LLE WATER AND SEWER UTILITY West Wastewater Treatment Plant Storage Basin Evansville, IN The project, part of EWSU's CSO Long -Term Control Program, increased the influent screening capacity and provided storage to excess wet weather flow. This project was procured using Indiana's Guaranteed Saving Contracting. Kokosing Industrial came on board at approximately the 60% design point and worked with the Design team through final design. Storage Basin: The 6 MG concrete storage tank was 260-ft x 192- ft x 35-ft deep and was designed without columns within the basin. Key collaboration points with the Engineer included selecting the shape of the walls of the concrete tank and the design of the pile foundation system that satisfied the design requirements while allowing for most efficient construction methods. The work included effluent piping to return flow to the main plant influent pipe and a dewatering pump station for draining the lower portion of the basin. Screening Facility: A new 100-mgd screening facility was , constructed upstream of the existing screening facility, over and around the existing influent pipe. The 66" RCP pipe, which received flow from 42" and 66" interceptors, was over 80 years old, +20-ft deep, and constructed on wooded piles through the new facility location area. Four, 33-mgd bar screens with washers and compactors provided the screening The facility also included a side -spill weir gate that controlled flow to the Storage Basin. Through the construction of the structure, the interceptors were \� plugged and bypass pumping used to transfer flows to the existing screening facility to create a safe working environment and protect the plant influent. The start of construction was aided by the use of a Limited Notice to Proceed, which allowed Kokosing to negotiate for, enter into a lease, and prepare the ground of the adjacent property used for trailers, parking and staging. This approach saved the project approximately three (3) months and allowed Kokosing to begin work promptly upon receipt of the NTP.