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• 1111 K ,�o/N _TON BOI NAN , I NC® 0 �Z Consulting Engineers & Surveyors 2638 Shadow Lane, Suite 200•Chaska, MN 55318-1172 Phone(952)448-8838•Fax(952)448-8805 www.bolton menk.com August 5, 2013 City of Orono Attn: Melanie Curtis PO Box 66 Orono,MN 55323 RE: Conditional Use Permit Application 13-3624 3165 North Shore Drive Engineering Review#1 Dear Melanie: As requested,we have completed an engineering review of the Erosion and Sediment Control Plan and Certificate of Survey prepared by Gronberg&Associates,dat:d 7/30/13,and submitted for the above referenced project. We offer the following observations,co ents, and recommendations for your consideration: 1. The Applicant proposes to move more than 500 cy of m terial within the Shoreland Overlay District. Therefore,Conditional Use Permit approval by the City ouncil is required in addition to the staff- issued Land Alteration Permit. Also,since the Applica proposes to achieve proposed grades by importing fill,the City should consider the following: a. The City Engineer should be allowed to inspect any I ill being imported to the site prior to it being placed. b. The Applicant should confirm with the City Engine:r acceptable hours of truck hauling and provide documentation on the haul route to be used. Acceptable hours and haul route should be approved prior to the importing of any fill. c. The City Engineer should inspect roadways on haul i oute prior to and following completion of work to determine whether adverse impacts have oc urred.The applicant should be responsible for the repair to roadways for any adverse impacts. 2. Grading,filling,and excavating of less than 10 cy is pro•osed within 75 feet of the ordinary high water level of Lake Minnetonka,which requires staff review . d approval. A boulder wall is being removed in this area;therefore,a minimum amount of grading is equired to accommodate the grade change. The grading proposed in the 75' zone will not adversely affect adjacent or nearby property. 3. The proposed grading in the northeast corner of the site s oes not appear to match what is intended. The 936 contour does not connect with the edge of the s to and a depression is shown in the northeast corner. The grading should be revised to depict the swa e continuing along the north and east property line,flowing continuously to the 934 contour. 4. For areas where a 50 foot natural buffer to the ordinary p igh water level cannot be maintained,a double row of siltfence should be installed to ensure ad-•uate erosion and sediment control protection for Lake Minnetonka. The perimeter siltfence should b: inspected by the City prior to any land altering activities. 5. The proposed swale along the north property line will c•ncentrate runoff flow. Therefore,erosion control blanket and/or biologs should be installed in this area after grading is complete to provide adequate protection against erosion and transport of sed't ent until permanent vegetation is established.