04-22-1998 Council Agenda - Laserfiche WebLink

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Memo son.,e,ve Project Name: GItendert Addition To: Kathy Glanzer, Scott Tangen From: Paul Heuer Re: Review of Drainage Plan/Calculations Client: Little Canada File No: 372 - 249\372 -gen Date: February 3, 1998 Remarks: Previously, we had required the developer to restrict surface water runoff to less than or equal to predevelopment conditions. We have reviewed the owner's drainage plan and drainage calculations and offer the following comments: The small pond proposed at the northwest comer of the development satisfies this requirement: postdevelopmont runoff during the 100 -year storm event is lees than Beal yeurerated by the predeveiopment area. The change in runoff to the southwest corner of the property is statistically insignificant. Therefore, we recommend approval of the drainage plan contingent on the following conditions. 1) tip rap be placed in accordance with city detail plates 2) permanent drainage and utility easements be dedicated and acquired by the owner. Easements for the ponding should encompass the 100 -year flood contour of 871.8. We recommend that the pond and pipe be City owned and maintained to ensure proper maintenance and operation in the future. if the owner is unable to acquire an easement from the adjacent property owner, then the drainage plan must be revised to show all ponding entirely within the Gilanderi Development. Revised plans must be submitted for further review. 3) to ensure that the outlet pipe flows freely, a small amount of excavation may be required within the County Road 82 right-of -way. This will require a permit and approval from Ramsey County. Regarding the contiguration of the proposed street to serve the new lots, a little history may be helpful. Council had decided in 1995 to ailow the streets In this neighborhood to be 18' wide where driveways exist and 12' wide where no driveways exist (with no curb and gutter on either section). This was seen to be a compromise with the desires of the neighborhood and was seen to be a good fit for the atmosphere of the neighborhood. While these street widths are substandard from an engineering standpoint, it would be consistent in this case to have the proposed street be 18' wide with no curb and gutter in front of the new lots. cc Dick Kimmes, Chuck Plows Bonntroo, Rosen, Ande 1k and Associates 2335 West Highway 38 • St. Paul, MN 55113 • Phone: 612.638 -4600 • Fax: 612.636 -1311 Page 8