CCP 07-28-2003 - Laserfiche WebLink

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. . . URS Thresher Square 700 Third Street South Minneapolis. MN 554J5 Phone: (612) 370-0700 Fax: (6J2) 370-13783 To: Aaron Parrish/Arden Copy: Hills Tom Moore/Arden Hills File: Jim Perron/Arden Hills Nick Landwer/URS 37951-005 From: Gregory Brown, PE Arden Hills City Engineer Date: July 28, 2003 Subject: Karth Lake Pumping Station Based upon the July 21, 2003 Council W orksession, the City Engineer is proceeding with final design and advertisement for bids for the proposed Karth Lake pumping station. The following is a brief summary of the proposed improvements, estimated project cost and schedule: Proposed Improvements The system would include one submersible pump mounted in a floating pump raft with fish screens (approximately 6' X 6' ) that would be anchored in the lake when pumping is desired. The floating pump raft would be connected with power cord and a discharge hose to a small utility vault located on shore in an accessable location (ie buried along a trail). The utility box would include a connection to a permanent buried forcemain (approx. 4" diameter) and permanent electrical power source (underground) to operate the pump. A small surface mounted control panel would also be located at the utility box to provide basic on/off operation for the pump. The buried forcemain will traverse Cummings Park and connect to existing storm sewer piping in Cummings Park Drive and ultimately flow to Valentine Lake. The attached exhibits illustrate the forcemain alignment and water route to Valentine Lake. . The buried electrical will traverse Cummings Park underground and be connected to a power source in the new shelter building or an existing power pole or underground vault. When in operation, City maintenance personnel will check on the pumping system daily and if alarms are registered similar to a lift station. The pumps will be turned off when the desired lake elevation has been achieved as determined by monitoring of the lake gage. The drawdown will be slow and likely drop the lake only 1-2" per day depending on weather conditions. Once the desired drawdown is complete City maintenance personnel will remove the pump raft and disconnect the power cord and discharge hose from the utility box and place the equipment in storage leaving only the small control panel and utility vault in place on site. ClDocuments and SettingslPangS\Local Settingslremporary brternet FileslOLK271C<>unciJ Agenda Item 7 A Memo 7.28--03.doc