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11.111111% .4ISSO(I .UT .ES <br />Memo <br />TO: Honorable Mayor and City Council Members <br />FROM: Lee Elfering, City Engineer <br />DATE: April 9, 2008 <br />RE: Pioneer Park Irrigation System Improvements <br />TAR UOMH <br />Irrigation system breaks have been occurring in the Pioneer Park irrigation system due <br />to water - hammer within the system. In discussions with manufacturers and irrigation <br />Contractors the cause of the water - hammer has been attributed to the instantaneous <br />high pressure that is put on the system every time the well pump turns on at the <br />beginning of the irrigation cycle. To alleviate this problem we have requested quotes for <br />the installation of a Variable Frequency Drive (VFD) and transducer. The VFD allows <br />the start-up and shut -down of the pump to be done gradually over a specified amount of <br />time to minimize any water hammer within the system and the transducer will monitor <br />the pressure within the system to ensure constant pressure within the system during the <br />irrigation cycle regardless of the amount of water required by the zone that is running. <br />Two Contractors were asked to supply quotes for the work and only one was received. <br />The quote received was from Connelly Industrial Electronics, Inc. and was for $4,707.52 <br />plus any shipping and sales tax on the equipment. The quote was within the anticipated <br />cost for the improvements and money was allocated in the 2008 Park budget to <br />complete this work. <br />Based on the quote we received, we would recommend authorizing award of the project <br />to Connelly Industrial Electronics, Inc. If you have any questions please call me at 763- <br />780 -0450 ext. 13. <br />10062 Flanders Court NE — Blaine, MN 55449 — Ph: (763) 780 -0450 Fax (763) 780 -0452 <br />Memo - 040908 -CC (Pioneer Irrigation) <br />07 <br />