05-25-1999 Council Agenda - Laserfiche WebLink

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The Honorable Chairman and Planning Commission March 8, 1999 Page Three • No calculations have been submitted for the storm drainage pond proposed in Outlot A. Prior to final approval of the plat, the storm drainage calculations will need to be submitted, reviewed, and approved. • The construction of the sanitary sewer and water facilities along Twin Lake Boulevard will require some removal of a portion of the paved surface. We would recommend that wherever a portion of the paved surface is disrupted it should be removed to centerline and the entire eastbound lane be repaved to provide constant ridability of Twin Lake Boulevard. • The sanitary sewer and water main cross under the existing ditch flowing through Outlot A and Lot 12 Block 2. It appears from the detail provided on the plan that the new culvert proposed at the crossing will actually be set above the flow line of the ditch. The drawing indicates the elevation of the top of the ice in February 1999 at 872.5 the invert of the culvert is proposed at 873.0. This means that the culvert is at least a half -a -foot above the flowline of the ditch and potentially substantially more. The contours indicate that it could be as much as 3 feet above the flow line of the ditch. The developer should provide additional information to indicate that backing up of the ditch to this elevation will not cause any potential damage up stream. • Easements are shown on the preliminary plat for the sanitary sewer and water main crossing Lot 12 Block 2. Additional easements will also be needed for the existing ditch flowing through Lot 11 and 12 Block 2 and the proposed storm drainage pond as it impacts Lot 2 Block 1. • Street lighting should be provided with the development of this plat. It should be developer installed under Group 5 of NSP. • There was some discussion with City staff that there are several street names which start with "Twin Lake" in the area. Perhaps the street name in this development should be changed to avoid further confusion in the area. • Lot 12 Block 2 has very minimal back yard from the house pad to the high water level of 875.0. It appears that the distance could be less than 20 feet. An attempt should be made to give this lot as large of back yard area as possible. • The plat should provide easement below the high water level of 875.0 to ensure that garden sheds and other miscellaneous backyard improvements are not placed in an area that will be periodically flooded. • The natural drainage in the rear yards of Lot 1 and 2 Block 1 would be to the south causing Lot 1 to flow across Lot 2. Additional easement should be provided on the plat to accommodate this natural flow. • The proposed grading between Lots 1 and 2 and 9 and 10 Block 2 should be adjusted slightly to ensure that the sideyard drainage remains within the prescribed drainage and utility easements. • It appears from where the proposed sanitary sewer ends that Lot 1 Block 2 sanitary sewer service will cut the corner of Lot 2 Block 2. Consideration should be given to extending the sanitary sewer slightly to eliminate this or provide necessary easements for the sanitary sewer service cutting the corner of Lot 2 Block 2. Page 87 ipany s o. /proj. /806330110240./330- 0308.march99 C