Laserfiche WebLink
� • 2335 Highway 36 W <br /> St. Paul,MN 55113 <br /> Tel 651-636�+600 <br /> Fax 651-636-1311 <br /> www.bonestroo.com <br /> February 4, 2011 �Bonestroo <br /> Melanie Curtis <br /> Planning and Zoning Coordinator <br /> City of Orono <br /> Post Office Box 66 <br /> Crystal Bay, MN 55323 <br /> Re: 3095 North Shore Drive <br /> File No. 000139-11000-1 <br /> File No. 2011-00005 <br /> Dear Melanie: <br /> We have reviewed the plans for the proposed new home construction at 3095 North Shore Drive. <br /> The plans are dated 1-27-1i. We have the following comments with regards to engineering <br /> matters: <br /> • The sanitary sewer main and service line should be shown on the plans. <br /> • We typically recommend that swales maintain at least a 2% slope to facilitate minor <br /> variations in final grading. The proposed swale on the lake side of the home is closer to <br /> a 1%grade. If this must remain at this flatter grade, we recommended draintile be <br /> placed within this swale. <br /> • The grading and drainage plan relies on grading up to the southwest lot line. This <br /> appears to contain a significant amount of trees that may be impacted by the grading. <br /> These trees should be shown on the grading plan to better understand the impacts to <br /> trees on both sides of the lot line. <br /> • Additional survey information should be required to establish more detailed drainage <br /> patterns along the lot lines. The current plan does not contain enough information to <br /> determine if the proposed drainage is managed on-site. The plans must show existing <br /> contours at least 50 feet on to the surrounding properties. <br /> • The retaining wall at the lakeshore seems to be unnecessary and should be eliminated. <br /> • The existing low point west of the existing home site should be evaluated by the <br /> Minnehaha Creek Watershed District to determine if it is a wetland. <br /> • Stormwater calculations dealing with runoff volumes and ponding elevations for the area <br /> southwest of the proposed home must be submitted. Ideally, an overland emergency <br /> overFlow would be constructed within the properly. The current and proposed overFlow <br /> is south across the property line and it is unclear whether this would cause water <br /> damage to the home at 3105 North Shore Drive. If the low area is to remain without an <br /> emergency overtlow within the property, we recommend designing the piped outlet to <br /> accommodate a 100-year back to back storm event. The critical storm sewer design <br />