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y � <br /> 11-3534 <br /> April 12,2012 <br /> Page 2 of 3 <br /> PRELIMINARY PLAT REVIEW-UPDATE <br /> This item was tabled on November 21, 2011 pending receipt and review of a Conservation Design and <br /> Master Plan, and pending confirmation of Minnehaha Creek Watershed District approval regarding <br /> wetland fill impacts and mitigation. <br /> A revised Preliminary Plat Survey and Road Design have been submitted, as well as drainage calculations <br /> and a drainage area map. Additionally, a Conservation Design Report has been submitted including a <br /> Conservation Design Master Plan detailing specific natural resources to be protected and protective <br /> measures proposed to be implemented. Comments from the City Engineer(Stantec dated 11/21/11 and <br /> Bolton & Menk dated 4/11/12) have been received. <br /> Conservation Design Report ' <br /> Please review Exhibit C. The Conservation Design Report discusses characteristics of the property and <br /> the subdivision design considerations that have resulted in the proposed layout. The report reviews <br /> natural resources of the site; note that a tree inventory was completed and appears on the preliminary <br /> plat drawings. <br /> The Conservation Design Master Plan addresses specific actions that have been taken or will be <br /> implemented to protect identified resources, including maintenance of existing drainage patterns; tree <br /> .preservation; wetland protection; and view protection. Information about these protective measures <br /> will be provided to lot buyers about the protective measures required for the property. A conservation <br /> easement is planned to protect the trees along the north boundary. <br /> Wetland Impacts&Mitigation <br /> Wetland Flowage and Conservation Easements and Buffer Covenants will be required. The need for <br /> wetland mitigation is expected to be eliminated by reducing the road shoulder width as it passes <br /> between the two wetlands near Willow Drive and by adding low retaining walls(less than 4' in height)to <br /> the road design for this stretch. Applicants will be pursuing a deminimus exemption for this fill. City <br /> Engineer will be asked to review whether guard rail or other barrier is needed as the walls are less than <br /> 4'from the curb. <br /> The City Engineer has noted that Wetland C (west side, north of driveway) has not been classified on the <br /> City Wetland Classification Map and will need to have a MNRAM classification to determine the <br /> appropriate buffer width. Other wetland recommendations are included in the 11/21/11 Engineer <br /> comments. Wetland buffer mitigation will be required where warranted. <br /> City Engineer Comments <br /> The City Engineer has identified a small number of items to be addressed prior to final plat approval. <br /> See Exhibits D and F. <br /> Additional Notes <br /> - The lot layout and lot standards have not changed since the November review. <br /> - The road design has changed slightly by adding surmountable swale concrete curbing to direct <br /> runoff to the culverts and ponding areas. The earlier plan showed a rural section (no curbing) with <br /> wide ditches. The curbing also reduces the grading required next to the road which allows for <br /> increased tree and wetland preservation. ' <br /> - As noted in November, a trail easement along Willow Drive should be granted for potential future <br />