09-28-2005 Council Agenda - Laserfiche WebLink

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drainage and utility easement be provided on each side lot line in order to allow sufficient room to construct a drainage swale centered on the property line to convey runoff between lots. The wall directly adjacent to the lot line on Lot 11 will require that the drainage swale be constructed entirely on Lot 12 to ensure against erosion of the retaining wall. Therefore, a ten -foot drainage and utility easement should be provided along the west lot line of Lot 12 in this area to allow for adequate width to provide a drainage swale between the two homes given the wall location on Lot 11. 8. We have had several discussions with the Developer and their Engineer in regards to this development. One of the main contentions of the meetings was the retaining wall that is currently proposed on the south side of Preserve Court from approximately station 11 +50 to 13 +50. The Developer was proposing a wall that was approximately 10 to 12 feet high and would have been supporting the City street and utilities behind it. The City did not want a wall supporting their infrastructure and felt that the wall was a significant deviation from the preliminary grading plan. At a meeting with the Developer on September 1, 2005 it was discussed that a wall of limited height, a maximum of 4 feet, would probably be allowed, but final approval would need to be granted by the City Council. The Developer revised his final plans and submitted them with a 4 -foot wall in this area. With a possible resolution to the size of the wall, the plan was reviewed in further detail as to the implications of the wall construction and the ability to construct and maintain the wall and the public infrastructure on the bottom side of the wall. There is approximately 10 feet of boulevard within City right -of -way from the back of the curb to the adjacent property line. The wall is 6 feet from the back of the curb leaving approximately 4 feet between the property line and the wall. A storm sewer flared end is proposed for drainage of a low point at the bottom of the wall. Once completed the responsibility of maintaining the storm sewer will revert to the City. With only 4 feet of right -of -way at the bottom of the wall, no equipment or even a pickup could access the inlet and all maintenance would need to be done from the top of the wall over the guardrail. It is our recommendation that the Developer be required to obtain a minimum of an 11 foot easement from the east end of the wall to the inlet from adjacent property owners to allow a 15 foot access width to the storm sewer inlet at the bottom of the wall. 9. The City Building Inspector noted that in accordance with Minnesota State Building Code 1303.1600 the minimum soil frost protection is 3.5 -feet for building sites. The protection must extend laterally as well as horizontally. Therefore, retaining walls must be at least 42- inches away from the foundation of any home to provide for this protection unless a licensed Engineer provides a signed plan detailing an alternative. It appears that some walls are within the minimum 42- inches. The walls must be revised or signed drawings provided prior to final grading plan approval. 10. The Developer should review the ground floor and lowest floor shown for the building pad on Lot 4. As currently shown, the driveway would be at 11.8% and retaining walls are necessary on three sides to support the lot due to the high elevations. Utility Plan 1. The storm structures on Preserve Trail should be moved back to the radius point and an additional structure added at the radius point of Preserve Court to move the storm line under the curb and away from the retaining wall to the east of Preserve Trail. 2. The storm sewer outlet from the street into the east pond discharges above the normal water level. The outlet should be extended to allow discharge at the normal water