03-24-2003 Council Packet - Laserfiche WebLink

Home Browse Search

Allcmativc Trunk Water System Design March 13.2003 Page 3 Boulevard. This will allow more water to cross between cities at the existing interconnect at Willow Drive than the 8*inch Orom. water main extension previously contemplated. This allows for some down sizing of interconnects with Long Lake. Orono has also completed 8” water main construction in the vicinity of Brown Road and West Wayzata Boulevard, creating an opportunity to interconnect the systems just west of Virginia Avenue. This interconnection would not require a jacking of West Wayzata Boulevard so it is a more economical interconnection. This interconnection effectively replaces the interconnection previously considered across West Wayzata Boulevard at West Industrial Boulevard. Orono would still consider a crossing of West Wayzata Boulevard westerly of West Industrial Boulevard. It would be looped to the west so as to better serve Orono’s properties south of West Wayzata Boulevard. The water main on the north side of West Wayzata Boulevard in Orono has been prone to failures due to corrosion and could be abandoned with the water system improvements now proposed. The second interconnect would occur across West Wayzata Boulevard near Brimhall Avenue as previously proposed. This interconnection could be reduced from a 12” interconnection to an 8- inch water main in the current analysis. With two proposed interconnections plus the existing interconnect at Willow, there would be three water main interconnections with Orono. During the course of these discussions on interconnects, the City of Wayzata approached Long Lake about possibly creating an interconnection at the very easterly end of Long Lake. An existing 6-inch water service has previously been extended through Green Glen Park across the Luce Line Trail to the daycare center along West Wayzata Boulevard. If that 6-inch water main was extended as a 6-inch water main to the new Wayzata Public Works Garage site, it could deliver 600 gpm to Wayzata when Long Lake’s water main system is under stress during peak summer periods, or up to 850 gpm when the system is at full strength. Alternatively, an 8-inch water main extension from the 6-inch water main would deliver 800 -1,050 gpm under the same conditions. Because Wayzata ’s elevated storage is at a significantly lower elevation, it is not practical to expect the Wayzata water system to be able to feed Long Lake. If this interconnection is to be pursued, a discussion v'ith the daycare center will be needed regarding ownership and construction issues. The remainder of the trunk water main system within Long Lake is already under construction except for the 12-inch trunk water main connection from the Glenmoor Lane/lleather Lane intersection westerly to the 12-inch water main crossing to Stoneridge Colony. The crossing of the highw'ay/railroad corridor is in the current Phase 1 Utility contract, but the easterly extension from that point to the Glenmoor area was deleted from the Phase 1 Utility contract due to the high cost of the railroad license. This water main should be scheduled for construction as soon as the railroad is relocated to the south and MnDOT comes into ownership of the current rail corridor. Then Long Lake should be able to install this water main with a simple MnDOT permit. Comparison to Original Design A comparison of the components of the previous and current water system alternatives follows. All estimated costs of the recommended improvements include overhead expenses. i