08/13/2003 P&Z Packet - Laserfiche WebLink

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• • Planning & Zoning Board Marshan Lake Industrial Park August 13, 2003 Grading and Drainage. A grading and drainage plan has been submitted for review by the City. The existing drainage flows north to Anoka County Ditch No. 10, which runs along the northern property line of the proposed plat. An existing private drainage ditch runs northerly through the property into the County Ditch Ten. The private ditch will be diverted into a proposed storm sewer to accommodate site grading. The new storm sewer will be routed through on -site infiltration basins and/or holding ponds and ultimately into County Ditch Ten. The County ditch will be preserved in its existing condition. The City Engineer has completed a review of the Grading and Drainage Plan. His comments, dated August 8, 2003, are attached. Utilities. The subdivision is proposed to be serviced with public sanitary sewer and water utilities. The sanitary sewer service will be provided by the existing trunk sanitary sewer main that runs along the west side of the site, parallel to I -35W. The sanitary sewer laterals will be extended through the site and out to Lake Drive. Sanitary sewer will need to be extended to the north property line adjacent to Lake Drive. A twelve -inch water main is proposed to be extended from the existing trunk water main along I35W to Lake Drive. The water main will need to be extended to both the north and south property lines adjacent to Lake Drive. The City Engineer has completed a review of the Utility Plan. His comments, dated August 8, 2003, are attached. Drainage and Utility Easements. Drainage and utility easements are required. Drainage and utility easements at least ten (10) feet wide shall be provided on all exterior lot lines, and centered on common rear and side lot lines. These drainage and utility easements should be shown on the preliminary plat. Drainage and utility easements are proposed around the existing wetlands as well as around the proposed ponding areas. A 100 -foot wide drainage and utility easement covers the entirety of Anoka County Ditch Ten. A utility easement will need to be provided for the sanitary sewer and water mains extending across Lot 3, with size and width to be determined by the City Engineer. Floodplain. The portion of the site which bounds County Ditch Number 10 lies within a Flood Plain Zone A. This affected portion of the ditch runs generally east -west across the northern portion of the property. Zone A represents areas of 100 year flood where base flood elevations have not been determined. The City's Floodplain Management Ordinance requires that all principle structures be located no lower than one foot above the regulatory flood protection elevation. The remainder of the project is locate in Zone C, a non -flood plain area, and no impacts to the flood plain are proposed as a result of the project. Wetlands. The project site contains 1.5 acres of wetland, comprising two wetlands: one on Lot 3 and one on Lot 4. No filling or alterations of the wetlands are proposed as part of the project.