Agenda - Council - 08/08/2006 - Laserfiche WebLink

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Preliminary Plat: Amber Ridge 2nd Addition June 29, 2006 Revised August 3, 2006 2of4 Public Streets and Access to Lots: The preliminary plat proposes to extend the Argon Street cul -de -sac to proyide public access to the lots. City Code restricts the length of dead -end streets to 600 feet. Argon Street cul -de -sac is currently about 830 feet in length. On Monday, July 10, 2006, the Ramsey Board of Adjustment approved a variance to the maximum cul -de -sac length. Traffic Analysis: The traffic generation for a single family residence is 10 vehicle trips per day. Therefore, this development is anticipated to generate a total of 50 trips per day. Traffic from this development is anticipated to primarily utilize the TH 47 corridor. There is a study of this corridor, as recent as May of 2005, analyzing the level of service on TH 47 at the intersections including Alpine Drive, Sunwood Drive CSAH 5, and. CR 116. All of the above intersections, excepting the intersection at CR 116, performed at acceptable levels. This study included traffic anticipated to be generated from the Estates of Silver Oaks development, which will add an additional 92 single family homes. The CR 116 intersection has approaches which experience level of service F with current traffic volumes. A highway improvement project is currently underway which will add a dedicated right turn lane for the westbound leg of this intersection. The City is also participating in a joint study with the City of Anoka and Anoka County to address the necessary long term improvements for the TH 47 corridor. Noise Mitigation: MnDOT has indicated that residential land use may not be compatible with highway impacts, notably potential noise complaints. MnDOT. policy prohibits the expenditure of highway funds for noise mitigation measures. The plat lies adjacent to T.H #47. A six foot wood screening wall has been constructed adjacent to the east right of way of TH 47 along the length of this proposed subdivision. Drainage and Grading Plan: A preliminary grading plan has been prepared by LSJ Engineering Inc. In general, the extended segment of Argon Street and the front halves of the five additional residences are proposed to drain to the existing sedimentation pond located on Outlot A of the Amber Ridge subdivision. The rear portions of the lots within the proposed subdivision drain to two flared end drains which are connected to the storm sewer system which drains Argon Street. One of these drains is located on the common line between lots 1 and 2; and the second drain is located 70 feet south of common lot line between lots 3 and 4. The proposed grading plan is generally acceptable subject to the following comments: • The invert elevation of the storm sewer pipes to be installed should be labeled on the plan. • Drainage and utility easements should be shown on the plan. The easements should be of sufficient width to cover drainage swales. • Spot elevations should be placed at lot corners and at centerline swales at property lines (between lots 2 and 3; and lots 3 and 4). • Overland grades must be a minimum of 1%. Lots which have grades flatter than 2% will require a certificate of grading prior to the issuance of an occupancy peuiiit. A table needs to be added to the plan specifying the house type, minimum floor elevation, lowest opening elevation, street centerline grade, and back yard and front yard elevations. —191—