04/22/1996 Council Packet - Laserfiche WebLink

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E Feasibility Report for Marshan Lake Condominiums, dated September 12, 1995, and is not included in this report. Please refer to Figure C in Appendix A of this report for proposed sanitary sewer, improvements. B. Watermain Water service can be provided to the study area by utilizing the existing 12 -inch trunk lines from the north at Apollo Drive and 4th Avenue, from the south at Elm Street and 4th Avenue, and by extending the existing 12 -inch line at Forsham Drive north to the new roadway alignment. Eight -inch lines will "loop" these existing trunk lines together to provide water service to these areas. A 12 -inch stub will also be extended to the northeast at the southern end of the I -35W crossing to serve areas east of STH49 and north of the Shores of Marshan Lake subdivision. Fire hydrants will be provided along these lines. The area affected by these improvements is zoned Public Semi-public and Light Industrial, therefore four -inch and six-inch service stubs will be provided as part of these improvements. The proposed watermain improvements are shown on Figure D in Appendix A. C. Storm Sewer The proposed storm drainage system consists of constructing 12 -inch to 48 -inch reinforced concrete pipe to convey stormwater runoff from the proposed roadway and adjacent properties to proposed regional ponds. The northerly storm drainage system will outlet into a proposed pond which will indirectly drain into County Ditch No. 10. The southerly storm drainage system will also outlet into a proposed pond which will also indirectly drain into County Ditch No. 10. The City's Surface Water Management Plan did not include data for this area and required determination during a Capital Improvement Project Study. City staff authorized OSM to study this area for surface water management requirements. This study is presented in Appendix D. The storm drain systems are designed for 10 -year, 24-hour rainfall events. Ponds and storm drain outlets are designed for 100 -year, 24-hour rainfall events. The proposed storm drainage systems are shown on Figure E in Appendix A. OSM Project No. 5666.00 Page 2