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<br />13 March 2009 <br /> <br />To: <br /> <br />Dallas Larson, City Administrator <br />Paul Pa1zer, Public Works DirectorlBuilding Official ~ <br /> <br />From: <br /> <br />Re: Lift Station # I retrofit <br />+++++++++++++++++++++++++++++++1 I , : 1+++++++++++++++++++++++++++ <br />Over the past year, the city has spent more than $8,000.00 on call-outs, service calls and <br />rebuilding the pumps at lift station #1. In the past two months we have had 7 service <br />calls to unclog the pumps of minimal material at a cost of $350.00 per call. The <br />problems exist in both pumps and are continuing despite our best efforts to solve the <br />problem without replacing the pumps. <br /> <br />Attached I have quotes to replace the grinder pumps with similar grinder pumps and also <br />replace them with standard pumps with vortexing impellers. These pumps have the <br />impeller on the top and allow large solids to past underneath without ever coming in <br />contact with the impeller. From discussion with vendors and other cities, I believe the <br />vortex impeller pumps are the best long term solution along with modifying the lift <br />station to a three phase electric system utilizing variable frequency drive (VFD) phase <br />converters. Based upon the quotes provide, I recommend the Council approve the quote <br />from North Star Pump Service for $14,717.00 to change out the pumps and electrical <br />system at lift station #1 as stated in their proposal. North Star Pump believes they can <br />change out the pumps without by-pass hauling, but if that becomes impossible, an <br />additional hourly cost to pump down and haul the effluent to a downstream manhole may <br />become necessary. <br />