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This area is west of TH 47 and east of 149th Lane. The area in question is adjacent to the large DNR wetland <br />which abuts TH 47. The petition was initiated by the resident at Lot 3, Block 1, Ramsey Meadows 4th Addition <br />(5410 149th Lane NW). The homeowner contacted the City about water standing in the backyard. Review of <br />the grading plan indicates this area was part of the wetland mitigation plan prepared for the plat and is controlled <br />by the Wetland Conservation Act rules. There is a draintile that connects the backyard to the DNR wetland. <br />Stormwater from the wetland flowed into the back yard which is lower than the wetland. A drainage and utility <br />easement is recorded over the low area of the property. The DNR lists the normal water level of the wetland as <br />860.0. There is a retaining wall with steps in the backyard, with an elevation at the lowest step at approximately <br />860.1 The backyard slopes down from the steps so there will be water present when the wetland is at normal <br />elevation. <br />There is a pipe under TH47, which is the outlet for the wetland, and there is an outlet structure on the pipe that <br />controls the water elevation. The lowest point on the structure was approximately 2 1/2 feet above the normal water <br />elevation at the time the elevated water was occurring last summer. The structure was quickly modified to lower <br />the outflow elevation in an attempt to alleviate the high water concern. The overflow is now 0.8 feet above the <br />normal water elevation, but the structure can still be modified slightly to lower the invert to the approximate normal <br />water level of the wetland (860). <br />Funding Source: <br />The funding source for this improvement would be the Stormwater Utility Fund. It is estimated that this structure <br />modification would cost between $2,000 - $5,000, but staff would like to meet with local contractors to discuss all <br />options prior to making a final determination. <br />Staff Recommendation: <br />Staff recommends modifying the outlet structure to lower the wetland outfall elevation, placement of a flared end <br />section, and removal of vegetation around the outlet pipe. <br />Committee Action: <br />Motion to recommend to the City Council that staff seek quotes to modify the outlet structure to lower the outlet <br />elevation of the wetland. <br />Project Location Map <br />Ramsey Meadows 2nd Additon Plat <br />Resident Petition <br />Petition Map <br />Section 2 of Hakanson Anderson Report <br />Inbox <br />Tim Himmer <br />Len Linton (Originator) <br />Tim Himmer <br />Len Linton (Originator) <br />Tim Himmer <br />Len Linton (Originator) <br />Tim Himmer <br />Brian Olson <br />Kurt Ulrich <br />Form Started By: Len Linton <br />Attachments <br />Form Review <br />Reviewed By <br />Len Linton <br />Len Linton <br />Len Linton <br />Len Linton <br />Len Linton <br />Len Linton <br />Tim Himmer <br />MaryJo Warner <br />Kurt Ulrich <br />Final Approval Date: 05/11/2012 <br />Date <br />05/10/2012 03:01 PM <br />05/10/2012 04:08 PM <br />05/11/2012 08:35 AM <br />05/11/2012 09:51 AM <br />05/11/2012 11:03 AM <br />05/11/2012 11:08 AM <br />05/11/2012 11:28 AM <br />05/11/2012 11:29 AM <br />05/11/2012 11:55 AM <br />Started On: 05/09/2012 02:46 PM <br />