Agenda - Council - 02/28/1995 - Laserfiche WebLink

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The wetland in the southern portion of the plat has been delineated and it appears that construction oSthe road in that area can occur without disturbing the wetland. The City Engineer has requested that copies of the delineation worksheet be submitted to the City. Afl outlet is also proposed onto Hwy. 4/47. In exchange for this outlet, Mn/DOT may require closing one of the accesses on the west side of Hwy. 4/47 in the same vicinity. It is Staff's understanding that the developer has initiated an access permit application at Mn/DOT. Ti~e drainage plan submitted provides outlets for an existing pond and a natural low depression on th~ eastern boundary of the plat which currently have no outlet. The drainage from this area will ultimately discharge to Protected Wetland 4/659, which was provided with an outlet to the Rum RiVer as a part of the Amber Ridge development. Calculations have been submitted which show thht a 10 year storm would create a four inch bounce on Wetland//659 and a ten inch bounce from a i00 year storm. The bounce would disipate from discharge through the outlet over a period of tWo to three days. The developer needs to supply the City with a Tree Preservation and Planting Plan as an addendum to:the Grading Plan. The Planning Commission conducted a public hearing regarding the proposed plat on February 7, 195. There were comments submitted that objected to the closing of one of the accesses on the w~st side of//47 and concern was expressed that the development would intensify existing ~inage problems in the area. It was noted that several properties south of 150th Lane N.W. have back yards which have portions below the ordinary high water of Wetland #659. While the existing drainage system should control the elevation of the wetland at an elevation of 956.3, a review of water levels taken at the outflow in June of 1994 after a heavy rainfall shows that no w~ter was moving at a water elevation of 0.2 inches higher than the outflow elevation. This would su~ggest that sediment may have accumulated in this storm line from the recent home construction. The existing line has been scheduled for cleaning to remedy this problem. ~th regard to Mn/DOT's anticipated decision to require abandoning the access onto #47 from 152nd on the west side of 4/47, it really should result in a safer traffic area than if it were left open b~ause of the proximity to 153rd and the limited sight distance as a result of a knoll in the road. Recommendation: City Staff and the Planning Commission recommend preliminary plat approval. Council Action: Motion to: Grant preliminary plat approval to Willow Ridge contingent upon compliance with the City Staff Review Letter and resolving site access with Mn/DOT. Review Checklist: CC: City Engineer Parks & Utilities Supervisor 2/28/95 I I I I I I I I I I I I ! I I I I I I