2026-02-26 WS & CC Packet - Laserfiche WebLink

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0 U z W m W 0 00 00 00 ('4 0 0 N W W W W W W Technical Memorandum To: Michael Grochala, City of Lino Lakes From: Jon Christensen, PE, WSB Date: September 26, 2025 Re: Intercommunity Water Supply City of Lino Lakes and City of Centerville The City of Lino Lakes and the City of Centerville have two interconnections between their water distribution systems. These interconnections are normally closed, but they serve as a backup water supply in emergency situations. In 2023, approximately 25 million gallons (MG) of water flowed from the Lino Lakes distribution system to the Centerville distribution system. The cities are evaluating options for compensation for this bulk intercommunity water supply. One option is monetary reimbursement as detailed in the Interconnect Agreement. The Interconnect Agreement, dated Jan. 9, 2019, Section 2. Charges, states: The single two-way meter installed on the interconnect shall be read at the end of each calendar quarter. The city receiving tlte. geatest net flow shall reimburse the other city in the forTn of water which may be used within twelve months. In the event that that city does not have water capacity to provide the reimbursement in the form of water, they shall instead reimburse the providing city for the vA)st of such water at a rate of 80 `o of the provid'ng city's residential water rate at the urns, of billing. Payments shrill he made on car before the 20th duty of the month fallowing the end of the quarter. Another option that was considered is for the City of Centerville to supply 25 MG of water to the City of Lino Lakes. The Centerville system cannot serve the entirety of the Lino Lakes system due to several constraints: Inadequate production capacity to meet Lino Lakes max day demand. Inadequate transmission watermains from Centerville to the western half of Lino Lakes and Tower No. 1. Differing water tower overflow elevations which would require fine-tuned pressure differential control at the interconnect flow control valve and in each system's SCADA control well pump set points. An alternative proposed by the City of Centerville is to use the Centerville water supply system to serve the Watermark development in the City of Lino Lakes on a temporary basis until the 25 MG is returned. This scenario would involve the following: • Assuming 600 occupied residential units would be served using about 225 gallons per day (gpd), they would have a total average demand of 135,000 gpd. So it would take about six months to consume or return 25 MG. The City of Centerville would need to confirm that their water supply system can accommodate this additional average demand of 135,000 gpd and max day demand of 350,000 gpd. • Based on the relative hydraulic grade lines of the two water systems, pressures would only differ by a couple pounds per square inch (psi) which would be imperceptible. 13