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City of Arden Hills City Council Meeting for March12, 2018 P:\Planning\Planning Cases\2017\PC 17-029 - 3685 New Brighton Road Preliminary and Final Plat and Easement Vacation\Memos_Reports_17-029 Page 4 of 13 event a larger area of land was needed by the City for staging and completing a reconstruction of the lift station, the City would be able to obtain a temporary construction easement from the property owner at that time. The development plans include a retaining wall located on the west side of the lift station and within the proposed public easement. The retaining wall would be approximately 40 linear feet with a maximum height of four feet. The applicant has proposed constructing a retaining wall in this location to accommodate the access driveway on Lot 1. The retaining wall would not be constructed on top of the 8-inch underground sanitary sewer line within the easement and is not expected to impact the operation of the lift station. The draft Development Agreement includes a provision that the developer and/or subsequent property owners would be responsible for the construction and maintenance of this retaining wall. Staff also requested that the City Attorney include a provision in the draft Development Agreement on the use of the lift station paved area during construction. The developer would not be permitted to park vehicles, store materials, or use this paved area in any way during construction of the two new dwellings. Stormwater Management Stormwater Management Plan The City’s Subdivision Ordinance requires that stormwater management plans comply with Rule C – Stormwater Management Plans for the Rice Creek Watershed District Rules. In order to address stormwater management on the site, two rate control basins would be constructed on Lot 1 adjacent to the large wetland area on the western side of the property. Lot 1 and Lot 2 would be graded to direct stormwater runoff from these properties to the two basins. Both City and Rice Creek Watershed District (RCWD) staff reviewed the stormwater management plan for compliance with Rule C. The following design requirements must be satisfied as part of Rule C of the RCWD rules: • Peak Stormwater Runoff Control: the applicant is required to provide peak rate control for the 2, 10, and 100-year 24-hour rainfall events beyond the existing condition peak runoff by reducing the peak rate to 80 percent or less of the existing condition (Rule C.7). RCWD determined that the submitted information indicates the project would meet the peak runoff control requirements. • Water Quality: the applicant is exempt from the water quality treatment requirements (Rule C.2.g). • Volume Control: the applicant is exempt from the volume control requirements (Rule C.2.g).