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• = BOL_TON 8� M � N K , I NC� <br /> . Consulting Engineers & Surveyors <br /> • " 2638 Shadow Lane, Suite 200•Chaska, MN 55318-1172 <br /> Phone(952)448-8838• Fax(952)448-8805 <br /> www.bolton-menk.com <br /> March 6, 2012 <br /> City of Orono <br /> Attn: Melanie Curtis <br /> PO Box 66 <br /> Orono, Mn 55323 <br /> RE: Zoning Application 2011-01062 <br /> Minor Land Alteration and Retaining Wall <br /> 680 Minnetonka Highlands Lane <br /> Dear Melanie: <br /> As requested, we have reviewed the submittal package for the proposed grading and retaining wall <br /> installation at 680 Minnetonka Highlands Lane. The Building Permit Survey is dated February 24, 2012 <br /> and the Retaining Wall Plan is dated February 23, 2012. Based on our review, we offer the following <br /> comments for your consideration: <br /> L This project will disturb more than 100 cubic yards of material. Therefore, a Storm Water <br /> Pollution Prevention Plan (SWPPP) must be submitted for review in accordance with Sec. 79 of <br /> the City Code. The minimum$2,000 sediment and erosion control financial security should also <br /> be required of the owner for this permit. <br /> 2. Retaining wall layout and proposed grading differs between the Building Permit Survey and <br /> Retaining Wall Plan. Revise the layout and grading so that plans are consistent with each other. <br /> 3. Provide top of wall and bottom of wall elevations and dimensions on the retaining wall in key <br /> locations (i.e. grade changes, alignment changes). <br /> 4. Provide proposed grading elevations at key locations on the Building Permit Survey. <br /> 5. Revise the proposed driveway layout to include only one driveway approach(per City Code <br /> Section 18-136). <br /> 6. The proposed driveway appears to have a slope of 12°Io. Consider revising the driveway slope to <br /> under 10% when reconfiguring the driveway layout. <br /> 7. Include Hardcover Zoning (setback from OHWL) on the Building Permit Survey and revise <br /> Hardcover Calculations to correspond with appropriate zones. <br /> 8. The total for Proposed Hardcover Calculations should read"Proposed Hardcover"not "Existing <br /> Hardcover". <br /> 9. The applicant will be required to obtain a Minnehaha Creek Watershed District permit for erosion <br /> control. A copy of the permit should be submitted to the City after MCWD approval. <br /> 10. The proposed deck will require a separate Building Permit Application and corresponding plans. <br /> Please contact me if you have any questions or need additional information. <br /> Sincerely, <br /> BOLTON&MENK, INC. <br /> �� � �� <br /> David P. Martini <br /> Principal Engineer <br />