Reports from City Personnel — 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: August 28, 2025 ON-GOING PROJECTS REVERSE OSMOSIS WATER TREATMENT PLANT DESIGN – CLINT WIENEN The fill placement was completed to preload the site and Terracon gave their approval to commence with the building/structure construction on August 18th. The alternate trail route has also been paved. Construction is expected to pick back up after Labor Day. HIGHWAY 6 CONCEPT AND COST ESTIMATE – JAMES WATTERS Coordination with franchise utilities in the right-of-way remains ongoing. MSA is still pursuing responses from utility coordinators who missed the June 16th due date for Preliminary work plans. Work with the DOT Right-of-Way staff has been ongoing regarding the fit of the design within existing right- of-way. Several small adjustments have been made to ditch slopes and sidewalk near the “Hawk Wash” property on the southeast corner of US6 and Croell Avenue. MSA is preparing an operations analysis for the Croell Ave and Kimberlite St intersections with US 6 (Marengo Rd) after receiving feedback on crash history of the Croell Ave intersection during public engagement period. Turning movement counts were collected at these intersections during the second week of August and a report of findings and recommendations is expected to be ready in September. SYSTEMWIDE SANITARY SEWER MODEL – ERIC THOMPSON Flow meters in the sanitary system have been collecting data throughout the summer. One meter was moved to a new location in a larger pipe further downstream. The prior meter was not recording adequate sanitary flows to support calibration. Currently, MSA is waiting for more dry weather flow days, as it has been a rainy summer. Once adequate dry weather days are recorded (spanning Sunday – Saturday), MSA will remove the flow meters and being calibration of the sanitary system model in PCSWMM. PROJECT UPDATE Page 1 of 5