Agenda - Council - 06/27/1989 - Laserfiche WebLink

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Hakanson Anderson Assoc., Inc. Engineers, Surveyoa & Landscape Architects June 21, 1989 Honorable Mayor & City Council City of Ramsey 15153 Nowthen Boulevard N.W. Ramsey, MN 55303 Re: Vacation of Easement on Lot 3, Block 5 Whispering Pines Estates Dear Councilmembers: In response to a request by Mr. and Mrs. Richard Jarson to vacate the city's drainage easement over Lot 3, Block 5, we have reviewed the drainage in the areas to research alternative solutions to the drainage. The surrounding area draining into Lot 3 is approximately 13 acres. The calculated volume of runoff for this area is 53,300 cubic feet, based on a 100 year storm event. One alternative to alleviate the drainage problem would be to excavate a drainage pond between Lot 3 and Lot 4. The pond would need to be excavated to a depth adequate to provide storage of the 100 year strom below the existing basement elevation. We estimate the basement elevation to be 879.0. To achieve the required ponding capacity, drainage easements on Lot 3 and Lot 4 would be necessary and relocation of the septic tank and drainfield for Lot 3 would be required. A second alternative solution would be to provide storm sewer pipe from Lot 3 to the wetland area adjacent to the property and west. This wetland area is a part of the proposed Northfork Development around Itasca Lake. The pipe required to discharge the 100 year event strom to the adjacent wetland area is approximately $50 feet of 18" storm sewer. As sho%m on the attached exhibit, 2 manholes and 2 - 18" flared end section are required for proper inlet and outlet hydraulics. Drainage easements for the sto_--m sewer would also be required. 2ZZ Monroe Street Anoka, Minnesota 55303 612/427-5860 Fax 612/427-3401 Eugene J. Hakanson, RE James M. Winter, LS. Lawrence G. Koshak, RF_ Peter R.