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<br />Heritage Maples <br />September 26, 2005 <br /> <br />Page 3 <br /> <br />. The driveways for Building 1 - 4 have been moved to off of Yankton Street. <br /> <br />. Sidewalks are now shown on the plan along the west side of Yankton Street, along <br />the south side of the service road, and the internal portion of Private Street A. <br /> <br />. All sidewalk pedestrian ramps must be constructed in accordance with MnDOT <br />Detail 7036F. The precast panel should be red in color. Panels to be submitted for <br />approval prior to installation. <br /> <br />. There are a number of locations where catch basins fall in pedestrian ramps. All of <br />these need to be revised and the catch basins moved to different location. <br /> <br />. The area west of lots 46 & 47 is too flat. <br /> <br />. A retaining wall will most likely be needed along the west plat line at the rear of lots <br />5 thru 10. <br /> <br />. Show the details of the frontage road connections to the east and west. <br /> <br />. The intersection of the easterly Private Street A should intersect the frontage road at <br />more of a right angle. <br /> <br />. All storm sewer is expected to be maintained privately. <br /> <br />. The SW pond is shown to outlet near an 892 contour, the NWL is shown as 888.5 or <br />3.5 below the outlet elevation; how does this work? <br /> <br />. Show driveway elevations for lots 37 through 48. <br /> <br />. Revise pond contours to provide the following: <br />4: 1 maximum pond slopes <br />10: 1 aquatic bench at NWL <br />10-foot wide access around the ponds with a maximum cross slope of <br />2% 1 foot above the NWL. <br />Top of berm surrounding the pond 1 foot above the HWL <br /> <br />. Add a rip rap swale from the driveway near lot 36 to the pond. <br /> <br />. The wetland is being used as a detention pond, the HWL in existing calculations is <br />889.45,the proposed condition calculations shows the HWL to be 890.0 or about <br />0.69 Ac. Ft of storage. What will be the effects of this raise in high water elevation? <br /> <br />. A MnDot permit will be needed for ditch grading and culvert installation. Will <br />MnDot accept increasing the 100 yr. Discharge fro 1.79 CFS to 5.07 CFS? <br /> <br />. FES 113 is shown to outlet to the pond at 893.1 but the NWL is 889.0. Lower this <br />outlet to the NWL to avoid erosion problems. <br /> <br />S:\PLANNING\Case Files\200s\P 05-16 Heritage Maples\09 26 05 engr's memo.doc <br />