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£. ■ MEMORANDUM 10901 Red Circle OrWe, Suite 200, Minnetonka. MN 55343-9301 952.912.2600 800.734 6757 952 912 2601 FAX TO:City of Long Lake Michelle Morse and Marv Wurzer FROM: DATE: RE: Daniel R. Boxrud, PE March 13,2003 Alternative Trunk Water System Design SEH No. A-LONGL0003.00 Background At the February 4, 2003 City Council Workshop, we discussed the need for the City of Long Lake to construct additional elevated water storage to provide better fire fiow. This recommendation was based on the results of our study as reported in our September 2000 “Replacement of Sanitary Sewer and Water Facilities in Proposed Trunk Highway 12 Corridor Report on Feasibility.” We suggested that the cost to construct a new 400,000 gallon elevated tank including pilings, overhead expenses and removal of the existing water tower along Willow Drive would be upwards of $965,000. Other trunk water main improvements, including interconnects with Orono, would also be needed in the future. The City Council suggested that we explore alternative means of meeting the City ’s fire flow demand. If an alternative could be designed that avoided the need to construct additional elevated storage, the existing 200,000 gallon water tower along Willow Drive could be rehabilitated instead of replaced. During the discussion it was recognized that the water system interconnects with the City of Orono as recommended in the study should be explored for immediate attention. They will ultimately be needed whether the city constructs a new elevated tank or rehabilitates the existing one. If the city rehabilitates the existing water tower, the interconnections will be critical when the tower is out of service during rehabilitation. Analysis Subsequent to the February 4 City Council meeting, we have explored alternative means of bolstering the available fire flow without construction of a new elevated tank. Alternatives considered must be balanced against the exposure to risk. We have arrived at a reasonable alternative. This memorandum will provide a complete overview of short term and long term water system improvement needs, not just those discussed at the February 4 workshop. Like the 2000 study, it is proposed to meet the fire flow demand by considering the Long Lake and Orono systems as one merged system during a fire. This is the only way either city can Shorii ton Hendrickson Inc • Your Trusted Resource • Equaj Opporiundy Empiofer iiituiiuMiWiiniii ...................................... .