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Technical Memorandum <br />To:Michael Grochala, City of Lino Lakes <br />From:Jon Christensen, PE, WSB <br />Date:September 26, 2025 <br />Re:Intercommunity Water Supply <br />City of Lino Lakes and City of Centerville <br />The City of Lino Lakes and the City of Centerville have two interconnections between their water <br />distribution systems. These interconnections are normally closed, but they serve as a backup <br />water supply in emergency situations. In 2023, approximately 25 million gallons (MG) of water <br />flowed from the Lino Lakes distribution system to the Centerville distribution system. The cities <br />are evaluating options for compensation for this bulk intercommunity water supply. <br />One option is monetary reimbursementas detailed in the Interconnect Agreement.The <br />Interconnect Agreement, dated Jan. 9, 2019, Section 2. Charges, states: <br />WSBENG.COM <br />| <br />651.286.8450 <br />| <br />Anotheroptionthat was considered is for the City of Centerville to supply 25 MG of water to the <br />55101 <br />City of Lino Lakes. The Centerville system cannot serve the entirety of the Lino Lakes system due <br />| <br />to several constraints: <br />Inadequate production capacity to meet Lino Lakes max day demand. <br />Inadequate transmission watermains from Centerville to the western half of Lino Lakes <br />and Tower No. 1. <br />Differing water tower overflow elevations which would require fine-tunedpressure <br />ST. PAUL, MN <br />differential control at the interconnect flow control valve and in each system’sSCADA <br />| <br />control well pump set points. <br />An alternativeproposed by the City of Centerville is to use the Centerville water supply system to <br />serve the Watermark development in the City of Lino Lakeson a temporary basisuntil the 25 MG <br />SUITE 200 <br />is returned. This scenario would involve the following: <br />| <br />Assuming 600 occupied residential units would be served using about 225 gallons per <br />day (gpd), they would have a total average demand of 135,000 gpd. So it would take <br />about six months to consume or return 25 MG. The City of Centerville would need to <br />STREET <br />confirm that their water supply system can accommodate this additional average demand <br />TH <br />of 135,000 gpd and max day demand of 350,000 gpd. <br />Based on the relative hydraulic grade lines of the two water systems, pressures would <br />only differ by a couple pounds per square inch (psi) which would be imperceptible. <br />178 E 9 <br />24 <br /> <br />