Agenda - Planning Commission - 07/07/2011

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Review File: Stoney River Sketch Plan and Site Plan Review June 30, 2011 Page 7 of 10 • Please add labels to sheets L2.1 and L2.2 indicating which symbols represent Autumn Blaze Maple and Prairiefire Crabapple. • Note #10 on sheets L2.1 and L2.2 references a McDonald's site, revise to state Stoney River. • Add planting details for deciduous and coniferous trees and shrubs. The detail must, at a minimum, indicate the following: o Planting depth shall be such that the first set of primary roots is at final grade. o Remove twine, wiring, ropes and burlap from top and sides of root ball. o At time of planting, only prune out dead or damaged branches. All necessary pruning cuts shall be made just outside of branch collar area. o Remove all tags and labels. o Wood chip mulch shall not be piled against the trunk of trees. • A two (2) year maintenance guarantee is required on all landscaping after initial acceptance by the City. Please add this to the notes section of sheets L2.1 and L2.2. Bufferyard: As outlined in City Code, a buffer yard twenty (20) feet wide, containing an additional twenty percent (20%) of plantings, would be required along the northern property line. However, the nearest adjacent structure is approximately 250 feet to the north of the proposed common property line and there are a number of existing trees within this space. It is Staffs opinion that the existing tree cover and considerable space meet the intent of the buffer yard requirement. Civil Engineering Review Reviewer: Tim Himmer, City Engineer thimmerfaici. ramsev.mn. us 763-433-9893 Grading and Drainage: The following comments are offered regarding the June 7, 2011 Grading and Utility Plans prepared by Landform: • Please make sure that all items shown on the various plan sheets are either clearly noted on the plans or are referenced in the legend. • The B612 concrete curb detail should be amended to include base material extending to 1' beyond the back of curb. There are other City standard details that should also be included, and we can forward those to you for incorporation into the plans. • The pedestrian ramp details have recently been modified at the state level, and the plans should be revised to include the most recent Mn/DOT approved detail and design. • All retaining walls greater than 4' in height must be structural designed and certified by a registered engineer. • We are continuing to evaluate the submitted stormwater plan and associated calculations so additional comments may be forthcoming, but there are some items that cause some immediate concern and/or clarification. • Please clarify the ultimate discharge points for the proposed storm sewer system. Three underground vaults are proposed but there is no conventional system in place to account for final discharge; is all water supposed to be infiltrated and never reach the surface? What would occur under a significant rainfall event or during frozen soil conditions? • Please provide the pre and post development rate of runoff calculations for this development. • A maintenance agreement will be required for the proposed storm sewer system outlining the expectations and requirements for the underground vault proposal. This document must be approved and recorded against the property at the time of platting.