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Elk River <br /> Municipal Utilities <br /> 13069 Orono Parkway phone: 763.441.2020 <br /> Elk River, MN 55330 Fax:763.441.8099 <br /> April 28, 2004 <br /> To: Elk River Municipal Utilities Commission <br /> Jerry Takle <br /> James Tralle <br /> John Dietz <br /> From: Bryan Adams <br /> Subject: Aquifer Storage and Recovery <br /> Attached is a proposal for Engineering Services for phase 1 A Aquifer Storage and <br /> Recovery Testing Plan and Permitting. Correspondence describes in detail the entire <br /> program and range of possible costs. <br /> The concept behind Aquifer Storage and Recovery (ASR) is to treat water during off <br /> peak (Oct. thru March) when we have treatment capacity and inject it back into the <br /> aquifer(storage). During periods of high demand (summer months), this treated water <br /> can be pulled back out of the aquifer (recovery), re-chlorinated and pumped into the <br /> distribution system. The benefit is not building a water treatment facility at an <br /> approximate cost of$1,000,000 for a 1000 gpm plant. The downside is we must pump <br /> this water twice and chlorinate it twice at an additional cost of approximately <br /> $140/million gallons or $9,800 for 7,000,000 gallons/year. Additional $9,800/year to <br /> save a $1,000,000 plant investment is a substantial savings. <br /> The other risk is this technology has been done in other states but never in Minnesota. It <br /> could ultimately cost us $250,000 in testing and engineering fees to see if this technology <br /> will work. It does make sense to phase into this project. If started in 2004, it would be a <br /> non budget expense. Is this type of project of interest to this commission? <br />