04/14/2004 P&Z Packet - Laserfiche WebLink

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Oakwood View Page 3 April 7, 2004 City of Lino Lakes, Minnesota Other general comments regarding drainage are as follows: 1 The applicant has indicated that an NPDES Phase II permit has been forwarded to the MPCA. All requirements of the Permit shall be completed prior to engaging in grading activities. A Storm Water Pollution Prevention Plan (SWPPP) has been provided in accordance with NPDES requirements: The Plan must be signed by the applicant. 2. The storm drainage plan requires further information regarding emergency overflows and outlets. For example, the proposed pond at the northwest comer of the property does not show an outlet or overflow location on the grading plan. Existing topography suggests that at least some of the existing drainage for the Oakwood property flows to the west. Therefore, the impact of excess drainage to properties located adjacent to the Oakwood property (both east and west sides) must be investigated further. Ponds as labeled on the Hydro -Cad model do not appear to correspond to the ponds as shown on the grading plan, and must be clarified. 4. Stormwater routing at the south end of the property (Ponds 2 and 5) proposes the eventual routing of stormwater to the north to Woodridge Estates by way of a ditch along the east side of the property. It is not known for certain the condition or capacity of the ditch, and the potential impacts of the 100 year HWL beyond the Oakwood View property. It is recommended that this be investigated further. 5 Review and approval of the Rice Creek Watershed District (RCWD) is required. Per the previous review, the City received a copy of the Watershed's response to the developer's application, and a copy of a Conditional Approval Pending Receipt of Changes (CAPROC). The following conditions of note are required by RCWD as a result of the CAPROC: A. Geotechnical soil borings must be conducted and provided to determine depth to the water table and substrate materials. This is particularly needed to ascertain if the proposed rain gardens will function as infiltration basins. B. Vegetation specifications must be provided, including deep rooted native vegetation for proposed . rain gardens. A note must be provided on the grading plan providing for the establishment of vegetation, including incorporation of the City's seed specification as provided. C. Pond outlet details must be provided on the Grading Plan and provide skimming capability for up to the 1 -year event. D. The wetland boundaries must be field verified by RCWD staff. E. The 100 -year flood elevation and emergency overflow and location must be provided for each pond and wetland basin. This information is provided on some but not all basins on the grading plan. It also appears from the plan that some proposed low floor elevations do not meet the City's