Wessler provided full-time construction contract management (CCM) and resident project representative (RPR) services for the Warsaw Wastewater Treatment Plant (WWTP) Expansion project. As the CCM, Wessler provided continued coordination with the contractor and the operations staff for all planning and execution on new system start-ups, as well as tie-ins when modifying existing process equipment and appurtenances. As part of these efforts, Wessler provided monthly reviews of critical path method (CPM) schedules to ensure the project continued on schedule and assisted the owner in all change management issues that occurred during the project.
The purpose of the project was to expand the WWTP to 6.0 million-gallons-per-day (MGD) design average flow and 18 MGD design peak flow. With a vision for the long-term and potential for ultimate expansion to a 12 MGD capacity on the current site, the City team elected to convert to anaerobic processes in order to minimize energy consumption and reduce sludge production over the life of the facility. The project included new grit removal, new circular primary clarifiers, a new 3 stage anaerobic selector tank, conversion of the Carrousel oxidation ditch to separate mixers and diffused aeration, a new secondary clarifier and replacement of existing clarifier equipment, a new chemical feed building for back-up phosphorus removal, and expansion of the UV system. Solids handling improvements included conversion of the aerobic digesters to waste activated sludge (WAS), digested sludge and septage holding tanks, new anaerobic digester complex, new volute dewatering press, new plant-wide supervisory control and data acquisition (SCADA) system, and a new five-bay parking garage.
Provisions also were made for a future co-generation system to add a gas conditioning system and engine-generators for utilizing digester gas to produce electricity.
