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Township, and the south and west sides being fed by Vadnais Heights. Numerous system layout alternatives are possible should the City decide to proceed with separate water service areas from more than one source. Evaluation of these numerous alternatives was not included in the scope of this feasibility study; which looked at potential for a centralized water distribution system within Gem Lake with water provided by a single source. 4.1 Future Water System Construction Phasing By necessity, new distribution system piping will need to be constructed in the vicinity of connections to other City's first and then expanded away from the connection. Based on this, the most likely phasing scenario is to construct watermain in the eastern side of the City and expand west. Localized water quality concerns, either known or that may arise in the future, at locations within the City may drive phasing priorities of where the new water mains are constructed. Future Water System Estimated.: Costs The proposed pipe routes primarily go through already existing roads and developments. Cost estimates were developed for installation of the proposed water distribution systems. These cost estimates include conceptual level estimates for construction of the proposed systems, including removals and restorations, e.g. pavement removal and repair, required for watermain installation. These costs are conceptual, order -of -magnitude estimates. Estimated costs are considered Class 4 Feasibility Estimates as defined by AACE cost estimate classification system, with an expected accuracy range of -30% to + 50% based on project definition (up to 15% complete design) level analysis. 5.1 Connection to White Beer Lak Mj The estimated cost for a water distrib system within Gem Lake with source water provided by White Bear Lake is summlTed in Table 7. A more detailed cost estimate is provided in Appendix I. Tab pi ' o "0111,11111114VAIVNhite Bear Lake Connected Distribution System Percentage New Watermain Opinion • • • i ost ; i $5,009,997.17 Remove Existing Watermain $129,918.00 New Service Lines and Connections $1.078,125.00 Hydrants and Gate Valve Assemblies $578,000.00 New Interconnections and Metering Stations (2) $174,400.00 _ Subtotal $6,970,440.17 Contingency 25% $1,742,610.04 $8,713,050.21 _ Subtotal Engineering 20% _ $1,742,610.04 Total (Including Contingency and Engineering, $10,456,660.25 Note: Estimated costs are Class 4 Feasibility Estimates as defined by RACE cost estimate classification system, with an expected accuracy range of -30% to + 50% based on project definition (up to 15% complete design) level analysis. FEASIBILITY STUDY UPDATE City of Gem Lake, MN Page 10