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Grading <br /> The existing site area will be re-graded to shape in the proposed roadways, building pads, common area <br /> and all required stormwater management storage. The site will be graded to match elevations at the site <br /> perimeter and to capture site drainage as able. The elevation changes necessary to provide drainage <br /> within the site and to maintain maximum walkway and driveway slopes, does mean there will be <br /> situations where some private walkway connections to homes will require private steps. The steps will be <br /> provided by means of 7"maximum height risers with railings when more than 1 step is needed. <br /> Sanitary Sewer and Watermain <br /> The proposed development will connect to the existing public sanitary sewer aligned along the south <br /> property boundary of the site. One new connection to an existing sewer sanitary manhole is proposed to <br /> service the entire development. <br /> The development will obtain water service via connection to an existing watermain stub provided to the <br /> site from Kelley Parkway and via an existing watermain stub provided from Willow Drive along the east <br /> plat boundary. <br /> The development will extend public utilities within the development under the private roadway. The <br /> public utilities will be contained within an outlot that will be fully covered by public drainage and utility <br /> easement. <br /> Stormwater Management <br /> The development site falls within the Minnehaha Creek Watershed Management Organization (MCWD) <br /> boundary and will be subject to stormwater management regulations of the MCWD and the City of <br /> Orono. <br /> The site abuts an existing regional stormwater management pond. The pond has been previously <br /> designed to accommodate some of the stormwater management requirements for the development site. <br /> The pond was been designed to provide rate control and water quality for development of the proposed <br /> site at an 85% impervious surface coverage. Since the existing pond was constructed, stormwater <br /> management regulations have been updated to also require a stormwater volume control component. The <br /> proposed development does propose a much lower amount of impervious surface at 59%, so the existing <br /> stormwater pond does have the rate control and water quality capacity for the development as proposed. <br /> A stormwater management plan is proposed for the site to provide volume control of stormwater runoff <br /> from most of the sites impervious surface via filtration. A primary filtration basin captures the private <br /> roadway and driveway runoff from the site prior to discharging to the existing pond. Two shallow <br /> filtration swales are also proposed along Kelly Parkway to filter roof top and sidewalk runoff on the north <br /> side of the site. The stormwater management plan provides the required treatment to address MCWD and <br /> City regulations and is consistent with the design approach of the recently constructed Orono Senior <br /> Housing project west of the Orono Crossing site. <br /> Wetlands <br /> No wetland area has been identified on the development site. <br /> Preliminary Development Request January 20, 2021 <br /> ORONO CROSSSINGS Page 5 of 6 <br />