02-07-2022 Council Work Session Packet

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space per unit and said number of spaces can continue until such time as the City Council considers a need for additional parking spaces has been demonstrated. In addition to the City ordinance, PUD Resolution No. 14-21 requires 50% of the parking stalls to be underground. The 72 unit senior building requires 72 parking spaces with at least 36 underground. Sheet C3, Site Plan indicates 62 surface stalls, 2 handicap surface stalls, 72 interior (underground) and 9 detached garage stalls for a total of 145 parking spaces. Parking requirements are met. Grading Plan and Stormwater Management Per the Stormwater Management Plan prepared by Carlson McCain dated December 10 2021, the drainage boundary being considered is 113.810 acres, which includes all drainage from the overall NorthPointe development. Drainage areas affected by the proposed construction include the stormwater pond 300P located in the northern portion of the site, the stormwater pond 200P just outside the west-northwest property boundary (Pond 200P), Catchment 33S and 12S to Wetland 1P, which also receives stormwater from the outlets of Ponds 200P and 300P, and Catchment 11S to Ditch 3P, which is the receiving body for Wetland 1P. The proposed site will only affect drainage to these areas. The majority of the site flows to Ponds 200P and 300P. The remaining stormwater drains between Ponds 200P and 300P to Wetland 1P or to Ditch 3P. All stormwater, ultimately flows to Ditch 3P. The proposed construction will maintain the drainage areas provided in the overall NorthPointe master development plan to the maximum extent possible. The proposed apartment lot will meet the overall stormwater treatment requirements from the MPCA Construction Stormwater Permit. Adequate water quality treatment and rate control is provided by the existing regional ponds, wetlands, and ditches. All storm sewers have been sized to accommodate a 10-year storm at a minimum. The proposed development will not have an adverse impact on the existing stormwater infrastructure originally planned for the development of the site. The City Engineer and RCWD have reviewed the stormwater management plan. Public Utilities The new independent senior housing building will be municipally served by an 8" PVC sanitary sewer and an 8" DIP watermain located along Chestnut Street. Tree Preservation and Mitigation Standards Per the January 4, 2022 Environmental Board staff report: The Tree Inventory identifies 55 trees of which 22 will be preserved and 33 will be removed. Of the 33 removals, 27 trees are in Basic Use Area and non -environmentally sensitive areas. These removals will not require mitigation trees. The other 6 removals are in Basic Use Area and Natural Resource Protected Area. Three (3) of these trees are undesirable, due to being in poor condition or being an invasive species and do