Reports from City Personnel — M.9 - Engineer's Report

PROJECT UPDATE  A Review of MSA Projects in Your Community City of Tiffin, IA CLIENT LIAISON: Andrew Inhelder, PE Office: 319.364.4773 Cell: 515.802.0906 [email protected] DATE: June 26, 2025 ON-GOING PROJECTS REVERSE OSMOSIS WATER TREATMENT PLANT DESIGN – CLINT WIENEN Tricon's sub Neuzil and Sons began work on site June 23. Neuzil began coring out for the alternate trail, and stripping topsoil for the proposed RO and Clearwell Buildings in preparation for settlement plate installation. Settlement plates are scheduled to be installed June 27th. MSA is currently in the process of shop drawing review for Tricon submittals. HIGHWAY 6 CONCEPT AND COST ESTIMATE – JAMES WATTERS Coordination with franchise utilities in the right-of-way remains ongoing. MSA is pursuing responses from utility coordinators who missed the June 16th due date for Preliminary work plans. Coordination on the addition of a right-turn-lane for the Grove Park development at 443 Marengo Road is in progress. Contact has been made with the developer and a meeting with the Iowa DOT regarding design requirements and documentation was held Wednesday morning. SYSTEMWIDE SANITARY SEWER MODEL – ERIC THOMPSON Flow meters in the sanitary system have been collecting data consistently, and there are at least 3 weeks of recorded dry weather flow and potentially several viable wet weather events: May 19th (0.75"), May 20th (1.34"), June 3rd (0.46"), and June 16-June 18 (0.35" total). These will be used for model calibration, as well as any additional storm events recorded while the meters are installed. All the available plans have been referenced to populate the GIS pipe network with missing inverts. Some key locations are still missing inverts, specifically pipes in close proximity to the treatment plant. MSA is reviewing if there are any as- built plans for this area currently. If not, a survey crew will be mobilized to obtain these remaining inverts. Some structures have noticeable elevation changes between pipe segments. These locations will likely also require a field survey, to ensure the SWMM model is built with the best available information. PROJECT UPDATE Page 1 of 4