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,, � � <br /> �� . <br /> PC Exhibit L <br /> 2335 Highway 36 W <br /> St.Paul,MN 55113 <br /> � Te1651-636-4600 <br /> Fax651-636-1311 <br /> . www.bonesvoo.com <br /> �Bonestroo <br /> ]une 1, 2010 <br /> , Ms. Evelyn Turner <br /> Planner <br /> City of Orono <br /> Post Office Box 66 <br /> Crystal Bay, MN 55323 � <br /> Re: 2525 Shadywood Road (Woodhill Senior Cottages) <br /> File No. 000139-10000-1 - <br /> Plat No. 10-3471 <br /> Dear Evelyn: <br /> We have reviewed the plans for the proposed Senior Cottages, located at 2525 Shadywood Road, <br /> dated May 19, 2010. The plans include constructing a multi-unit building and detached garage, <br /> along with associated grading and utilities. We have the following comments with regards to <br /> engineering matters <br /> Grading/Drainage/Erosion Control/Wetlands <br /> • An engineered design and details should be provided for all retaining walls greater than 4 <br /> feet in height, or for tiered walls whose horizontal separation is less than two times the <br /> height of the wall. . <br /> • Plans should be submitted to the Minnehaha Creek Watershed District for review and � <br /> approval. • � <br /> • Provide an interim grading plan for the area where the future building is to be <br /> constructed. To the extent possible,this area should be graded such that runoff is <br /> directed to the filtration basins. <br /> • A current and approved wetland delineation should be submitted. Wetland buffers must <br /> be shown on the plans along with their required easements. <br /> • See attached comments from Phil Elkin regarding the storm water review. <br /> • The outlet control structure should be 5'diameter. <br /> • All turt areas should be seeded within 7 days of rough grading. This should be changed <br /> on the SWPPP. <br /> • Inlet protection and a concrete washout area should be shown and labeled on the plans. <br /> • It appears the Receiving Waters table on the SWPPP is incorrect. It should be updated <br /> to include Lake Minnetonka and the wetland. <br /> • The following note should be added in the Site Sequencing Notes on the SWPPP: <br /> , o The normal wetted perimeter of any temporary or permanent drainage ditch or <br /> swale that drains water from any portion of the construction site, or diverts <br /> water around the site, must be stabilized within 200 lineal feet from the property <br /> edge, or from the point of discharge into any surtace water. Stabilization of the <br /> • Iast 200 lineal feet must be complefed within 24 hours after connecting to a <br /> surface water. <br /> • This project will disturb more than 100 CY of material triggering Orono's erosion control � <br /> ordinance. City code requires that an erosion control financial security be submitted in <br />