McClure worked with the City in the completion of the infrastructure related negotiations with both Cargill and the OTF industry. The aggressive timeline for start-up of production required a concerted design effort and a strong working relationship with Iowa DNR. McClure completed a Facility Plan to determine the improvements necessary to convey and provide treatment of the wastewater generated at the Ag-Park, as well as future wastewater loads generated in the City over a 20-year design period.

McClure developed a phased approach to converting the plant to activated sludge. By the end of Phase 3, the plant had been comprehensively upgraded and expanded to meet new TN effluent limits. Major work items included:

• Designed for Max Month Flow of 15 MGD and 27,000 lb/day BOD
• Three (3) Vertical Loop Reactor (VLR) aeration basins in MLE configuration
• Three (3) Blower buildings with centrifugal and Turbo blowers
• New Headworks Building with mechanical screening, vortex grit removal,
• and grit washing
• Two (2) 90-ft diameter Primary Clarifiers
• Four (4) 100-ft diameter Final Clarifiers
• Two (2) Anaerobic digesters with sludge mixing and heating
• Four (4) Aerobic digesters for WAS treatment
• UV Disinfection and Effluent Pump Station

McClure also worked closely with the City and Cargill in negotiating the financial structure and wastewater service agreements instrumental in financing over $20 million of improvements. Detailed design was completed and the project was bid on schedule and under the original estimates established during project planning.
In 2021, the City authorized McClure to begin designing a new Category III rated certified laboratory and administrative building at the existing wastewater treatment plant site, as well as odor control improvements on-site and at the Ag-Park Chemical Feed building. This phase of work was completed in 2025, completing the series of approximately 15 years of modernization and capacity improvements to the treatment plant.