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<br /> <br />~ <br />EN HILLS <br /> <br />May 6, 2009 <br /> <br />Wayne Hardison <br />Director of Environmental Services <br />Presbyterian Homes and Services <br />2845 Hamline Avenue <br />Roseville, MN 55:1.:1.3 <br /> <br />Dear Mr. Hardison; <br /> <br />In July, 2008, the City of Arden Hills and Presbyterian Homes signed an Agreement <br />relating to the maintenance and repair of the chopper pumps installed in 2005 at Lift <br />Statjon #7. Generally, the Agreement required the City to pay for normal maintenance <br />and repairs of the chopper pumps. Presbyterian Homes was to pay for abnofmal <br />maintenance and repairs; and was to pay for replacements of the chopper pumps if the <br />repair and maintenance cost exceeded 50% of the maintenance cost. <br /> <br />Since July, 2008, the City has continued to experience abnormal costs associated with <br />the chopper pumps at Lift Station #7. The Hft station and the chopper pumps have <br />continued to require more maintenance than the City's other lift stations. Both of the <br />chopper pumps are in need of seal replacement for the motors, and both need new <br />cutting units. <br /> <br />The repair cost is estimated to be $1:1.,900 for each pump, or a total of $23,800 for both. <br />The cost of a new chopper pump is estimated to be $18,6001 or a total of $37,200 for <br />two. The City has determined that, because the repair cost exceeds 50% of the <br />replacement cost, and because these repairs are being required after only three years of <br />service, the pumps need to be replaced. <br /> <br />The City's Consulting Engineer has indicated that it would be more cost-effective to <br />replace the existing chopper pumps with two 10 horsepower submersible pumps, in <br />conjunction with the installation of an inline grinder. The inline grinder would process <br />the objectionable material discharged from Presbyterian Homes prior to the material <br />reaching the pumps. The estimated cost for each 10 horse power submersible pump is <br />$9/300, or a total of $18/600 for both. The estimated cost of the in-line grinder is <br />$27,000. <br /> <br />City of Arden Hills . 1245 West Highway 96 . Arden Hills, MN . 55112-5743 <br />Phone 651.792.7800 . Fax 651..634.5137 . www.ci.arden-hills.mn.us <br />