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• � BO L-TON 8� M � N K , I NC� . Consulting Engineers & Surveyors " 2638 Shadow Lane, Suite 200•Chaska, MN 55318-1172 Phone(952)448-8838• Fax(952)448-8805 www.bolton-menk.com November I1, 2013 City of Orono Attn: Melanie Curtis PO Box 66 Orono, MN 55323 RE: Variance Application 13-3642 2690 Caroline Avenue Engineering Review#1 Dear Melanie: As requested, we have completed an engineering review of the documents submitted for the above referenced project. Our current review is based on the following submittal items: • Variance Application; dated 10/23/13 • Hardcover Calculation Worksheet prepared by Kemper&Associates, Inc., dated 10/30/13 • Practical Difficulties Documentation Form, dated 10/23/13 • Endorsement from 2696 Caroline Avenue, dated 10/26/13 • Endorsement from 2691 Caroline Avenue, dated 10/29/13 • Correspondence from 2691 Caroline Avenue, dated 10/29/13 • Proposed Site &Grading Plan prepared by Kemper&Associates, dated 10/30/2013 • Architectural Site Plan prepared by Sharratt Design & Co. LLC, dated 10/25/2013 We offer the following observations, comments, and recommendations for your consideration: 1. The resident of 2691 Caroline Avenue has expressed concern that drainage along his property line is not negatively impacted by proposed improvements. Therefore, additional contouring, spot elevations, arrows, and notes should be added along the northwest property line near the proposed driveway to ensure that stormwater runoff is directed toward the lake and not onto the adjacent property. 2. The slope on the north side of the proposed patio appears to be greater than 3:1. The plan should be revised to adjust grades or add retaining wall as necessary to reduce slopes to less than 3:1. 3. The plans are unclear what is proposed for retaining walls. The Grading Plan should be revised to provide more detail for all proposed retaining wall work. Provide top of wall and bottom of wall elevations and dimensions on the retaining wall in key locations (i.e. grade changes, alignment changes). Walls four feet or greater in height must be designed by a licensed Professional Engineer. Multi-level walls spaced less than double the height of the bottom wall apart shall be considered one wall, and the height shall be determined from the base of the bottom wall to the top of the upper wall. 4. Perimeter siltfence should be installed down gradient from all land disturbing activities. The siltfence should be inspected and approved by the City prior to any work. 5. Ditch checks or additional siltfence should be installed in the proposed swales along the property line until permanent vegetation is established to limit erosion.