5.4. SR 05-02-2005 - Laserfiche WebLink

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East Elk River Elementary School/m 05-08 April 21, 2005 Page 3 . The pavement grades in the area of the service dock do not appear to provide positive drainage. Additionally, should the single storm sewer inlet become blocked, storm water will rise to an elevation of 33.0 to reach another inlet. Consideration should be given to adding an additional storm sewer inlet in this area. . The depression in the west parking area is shown to be 1.7 feet below the pavement. Does this area need to be depressed this much? If so, change the width of this depression to flatten the side slopes. Will this area be surrounded by concrete curb? If so, include a curb opening and spillway to direct drainage to the inlet. . The plan needs to include top of wall and bottom of wall elevations. for the retaining wall near the existing wetland on the east side of the project. . The plan needs to show NWL and HWL for the wetland area. C. Sheet C1.55 . The site is over one acre of disturbed. area and therefore, will require an NPD ES permit. It may be better for the School District site to apply for their own NPDES permit, rather than try to operate under the NPD ES permit for the River Park development, since beyond potentially rough grading of this site, it will be two separate contractors. Along with the NPDES permit and Storm Water Pollution Prevention Plan (SWPPP) needs to be prepared and signed by the contractor, owner, designer, and two executed copies provided to the City. The City has prepared a generic SWPPP which can be utilized by this project. . The pond slopes must be stabilized with erosion control blanket immediately following completion of the grading of these areas. . Due to the area of the project, temporary sedimentation basins are required and should be incorporated where appropriate. . The rock construction entrance is shown on a driveway connecting to a road that may not be existing at the time of construction. An alternate access point may need to be identified. D. Sheet C1.6 · Sanitaty sewer designs need to include proposed elevations. · The sanitary sewer and storm sewer on the site will be considered private, however the watennain will be considered public, since it includes hydrants for fire fighting purposes. Drainage and utility easements need to be provided around the site, encompassing the water system. . The eight-inch watermain connection shown in the south driveway should include an eight-inch valve. S:\PLANNlNG\Case Files \200S\CU 05-08 Anderson-] ohnson \04 21 05 engrs memo.doc