09-28-2005 Additions - Laserfiche WebLink

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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 level of the pond to prevent erosion problems. The orientation of the outlet should be towards the middle of the pond not towards a pond bank to minimize erosion. As shown it appears that this storm sewer line is outside of the drainage and utility easements being provided. The finished ground elevation should be shown in the profile view of the plans and a drainage and utility easement be granted over the pipe. The width of the easement should be a minimum of twice the maximum depth of the pipe and be centered over the pipe. 3. There is an existing sanitary sewer line along the west side of Lot 1 that is approximately 11 feet deep. The plat is currently providing a 20 -foot drainage and utility easement on the west side of Lot 1. The sanitary sewer is not centered within the easement currently being granted; therefore additional easement width should be provided to allow for maintenance. Given the 11 -foot depth of the sewer it is our recommendation that the easement be extended to the east a minimum of 11 feet from centerline of the pipe. - 5 -