Agenda - Planning Commission - 11/04/2010

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Sketch Plan and Site Plan Review -Cross of Hope Addition October 28, 2010 Page 3 of 6 Landscaping Plan: The following comments are offered regarding the October 4, 2010 Landscaping Plan prepared by Steve Erban: • The landscaping plan must identify both scientific and common name of proposed plantings, size, quantity and root stock. A minimum of one (1) tree per every 1,000 square feet of building addition is required. • Required size is two and a half (2.5) inch diameter for deciduous trees, six (6) feet for coniferous trees, and twenty-four (24) inches (height or width, whichever is applicable for the -species) for shrubs. • Planting depth shall be such that the 1st set of primary roots is at finished grade. • A minimum of six (6) inches of topsoil that meets Mn/DOT's Premium Topsoil Borrow specification must be installed over all disturbed areas not devoted to buildings, off-street parking, driveways, sidewalks, patios or other such improvements. If amending onsite topsoil, documentation must be supplied to the City certifying that the amended material meets this specification prior to installation. • All landscaping required due to the building expansion shall include an in -ground irrigation system. Please submit a revised landscaping plan that incorporates that above concerns. Tree Preservation: The proposed addition will require some tree removal to facilitate both the building addition and the relocation of the driveway accessing the site. Additional information is required regarding 'Area E' and the area at the north end of the pond/rain garden (it appears that excavation will be necessary within the dripline of the existing trees in this area and thus, should be included in the tree preservation. plan). A revised plan is necessary and should indicate the size and condition of the trees being removed and tree save fencing must be shown on the plan and installed prior to any earthwork begins. Engineering Review Reviewer: Tim Himmel., City Engineer tlt immetfa ei ramsev. tin. us 763-433-9893 Grading and Drainage: The building floor elevation should be set to be above the adjacent grade of the public streets while meeting ADA accessibility guidelines. Culverts should be added for the new driveway access locations to allow drainage patterns to be maintained. Is the entire impervious area proposed to sheet flow directly into the pond/rain garden; the proposed medians may create barriers to runoff and create locations for standing water? There appears to be considerable impervious area draining west to east across the site and storm sewer should be considered. The pretreatment rip -rap area will become an area that collects debris, sediment, etc., and must be adequately maintained. A maintenance agreement will be- required for this rain garden/ponding area to ensure that it receives timely maintenance and continues to perform to its intended design. The proposed rain garden/ponding area must be designed to limit discharge from the site to 75% of the pre-existing condition; the information provided only accounted for %" of runoff over the new impervious area. Please review and provide the appropriate information on a revised design taking this into account. An overflow location and elevation should be noted on the plans, along with proposed contours that show Where the drainage will go when it exits the ponding area, and how you intend to "divert runoff" from the area to the southeast. 18