06-09-2003 Council Packet - Laserfiche WebLink

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M3-2889 AprU 18,2003 Page? Capacity and design of this pond were previously deemed acceptable by MnDOT, the Minnehaha Creek Watershed District and the City for development of this site for Office use under the PUD No. 2 approvals. Revised drainage calculations are required from the developer to confirm there are no drainage issues if the current proposal goes forward. The City Engineer has requested that a drainage area map and storm sewer calculations be provided by the applicants, as well as evidence that the downstream storm sewer has the capacity to serve the proposed use. Potential runoff impacts to the adjoining property to the immediate west should be addressed. Additional comments regarding engineering issues are listed in the City Engineer’s comments attached as Exhibit D. Tonography Impacts Lot 1 is significantly higher than the adjacent parcels on either side, with its high point near the northeast comer. The land slopes to the northeast, southeast and southwest from this point. Existing grade level rises 28' from the southeast comer of Lot 1 to the high point at the rear. The existing home in Sugar Woods directly behind Lot 1 is at or slightly above the highest elevation on Lot 1. Proposed walkout floor elevation for the Northeast Building is 1012 ’ or about 12 ’ below the high point of the hill. First story floor elevation will be about 2 ’ below the crest of the hill, but due to the northeasterly slope, the 48 ’ wide north facade of NE Building will expose 2 levels of windows and a roof system to residential properties to the north and east. Both NE and SE buildings will expose 2 levels and a partial half story to the Senior Housing building to the east. The result is visually a 270 ’ long fa9ade located 35’ from the east lot line and about 90 ’ from the senior housing end units. The grade at the walkout level of NE and SE will be about 8 ’ above the grade level adjacent to the Senior Housing building. At the south end of SE building, a retaining wall up to 6’ high will be needed along the north side of the service drive, due to the grade needed to gain access to the site from the Senior Housing Highway 12 access. As viewed from Highway 12, the south end of the property will include a grassy slope, the ser\’ice road, the retaining wall, and the 48 ’ w ide 2-level facade with windows. Note that the City Engineer has indicated the grade of the access road at the southeast and northwest ends of the site exceeds 12% and should be revised to not exceed 8%. This may have some impacts on the parking lot grades, which should be reduced to not exceed 4% (as submitted, parking lot grades are 0% - 5%). The parking area west of the NE and SE buildings will be two rows of 9 ’x20 ’ stalls, on either side of a 24 ’ center aisle, at an elevation approximately 8 ’ higher than the welding shop parking lot to the west. Applicants should be asked to describe what their intent is for the existing retaining walls on the adjacent site, since a handicap ramp is proposed to parallel the west side of the parking lot up to the West building.