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REQUEST FOR COUNCIL ACTION Date: 4/21/2025 Item No.: 10.d. Department Approval City Manager Approval Item Description: Adopt Resolution Awarding Construction Contract for 2025 Sanitary Sewer Lining Project #25-06 1 2 Background 3 The majority of the City’s sanitary sewer mains were constructed in the late 1950’s and 4 early 1960’s, utilizing clay tile and reinforced concrete pipe. Over time the joints have failed, 5 allowing root intrusion. The pipe material is also susceptible to cracking and construction 6 damage. The City began the sewer lining program in 2006 to rehabilitate the sewer mains 7 and extend the life of our sanitary sewers by 50 years or more. Lining technology installs a 8 new resin pipe inside the original clay tile sewer main without digging up city streets, which 9 results in minimal disruption to residents during construction. The liner pipe is inserted into 10 the main through existing manholes and cured in place with a heat process. Each segment 11 is typically completed in one working day. Service line connections are reopened using a 12 robotic cutter and remote cameras. During the process, existing flows are bypassed using 13 pumps. This type of rehabilitation prevents groundwater from entering the sanitary system, 14 so it can be credited toward the Metropolitan Council Environmental Services 15 inflow/infiltration surcharge. 16 17 Staff identified lining for approximately 5.4 miles in areas observed as having root intrusion 18 or infiltration problems and having sewer pipe ratings of 3 or less (on a scale of 1-5, 5 being 19 in the best condition). On December 2, 2024, Council approved a design contract with 20 Bolton & Menk, Inc., to design and provide cost estimates to perform this work. The 21 decision in hiring a design consultant was driven by the technical complexity of the project, 22 particularly regarding the need to bypass larger flows under major highways, railroads and 23 other high-volume traffic areas. Engaging a qualified consultant for design helped the City 24 mitigate potential risks associated with the bypass operation, ensure clear guidance is 25 given to contractors in the plans and specifications to obtain equitable bids, reduce project 26 delays, and ensure a cost-effective and efficient Cured-in-Place Pipe (CIPP) lining project. 27 28 The 2025 Sanitary Sewer Lining Project identified lining for approximately 2 miles in areas 29 observed as having root intrusion or infiltration problems and having sewer pipe ratings of 3 30 or less (on a scale of 1-5, 5 being in the best condition). Completion of 2 miles of sanitary 31 sewer pipe of the 5.4 miles originally identified was based on available budget for 2025. On Page 1 of 2 Qbhf!99!pg!216