Agenda - Council - 02/12/2002 - Laserfiche WebLink

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! I I I I I I I I I I I I I I I I of Lots 9, I0, l l, 12, 22, and 23 of Block 4 as well as lots 18, I9 and 20 of Block 5 are unacceptab[y flat. The minimum slope needs to be no flatter than one percent. Anoka County highway policy states that the discharge of stormwater to the county highway ditch along CSAH 5 should be no greater that predevelopment conditions. Special attention should be directed to the runoff from townhouse units 22 thru .35 of Block 5 to make sure that they comply with Anoka County policy. The plan also proposes steep grades along the sedimentation pond and wetland in the southeast portion of the development. Max/mum grades adjacent to water bodies are six horizontal to one vertical. Some of the slopes are nearly twice this steep. Retaining walls or special landscape measures should be considered to reducing these slopes or minimizing the erosion potential of these areas. During the Planning CommiSsion public hearing held in June 2001-, a resident was concerned with the location of the northwest drainage pond. The Planning Commission, 'as a condition for approval, instructed the developer to work with the resident at finding other solutions in regards to the location of the northwest drainage pond. The pond proposed is the same shape and location as was considered previously. The sedimentation pond located on portions of Lots I2, 13, and 14, Block 3 is problematic from several perspectives. Tlxe required grading will result in steep backyard slopes that will exceed the maximum allowed slopes. This grading will require the removal of trees to accommodate the sedimentation pond. Finally, a portion of the pond is proposed to be located on land which is to be dedicated as parkland. Staff'would suggest that the developer discuss with the City the possibility of relocating this pond to an akernative location to the south and east. Staff understands that the developer will be meeting with the Lower Rum River Watershed in the near future to discuss the possibility of decreasing the size of the drainage ponds. Utilities and Water Usa,oct The development will be served by municipal water and sanitary sewer. Sanitary sewer is available on the southern 13order of the site and watermain is available along CSAH 5. A preliminary utilky plan has been submitted for review. The plan is generally acceptable. Detailed construction plans will need to be submitted and reviewed by the City Engineering Department. The developer will need to pay the standard trunk charges associated with these utilkies. A utility p[an has been submitted and is generally acceptable with the following comments; Watermain on cul-de-sacs may be reduced from eight inch pipe' to six inch' pipe; 2) The apartment building should be looped between Dysprosium Street and the eastern most townhouse waterrnain. This will provide two sources of flow to the apartment building; 3) An eight inch waterline should be extended between Lot 6 and 7 of Block 5 to provide future service to Fluorine Street. Tree Preservation Plan: Royal Oaks Realty and City Staff have met and agreed to a tree preservation plan. The steps and requirements of the tree preservation plan will be detailed -219-