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• � BOLTON 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 August 6, 20]4 City of Orono Attn: Christine Mattson 2750 Kelley Parkway Orono, MN 55356 RE: Building Permit Application 2014-00747 3320 Navarre Lane Engineering Review#1 Dear Christine, 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: • Certificate of Survey prepared by Engineering Design&Surveying, dated 7/8/14 � Building Plans We offer the following observations, comments, and recommendations for your consideration: 1. Erosion and sediment control Best Management Practices (BMPs) should be installed down gradient from the proposed work. Siltfence should be indicated on the plan in the green areas, and rock check bags should be indicated at the proposed driveway. 2. Erosion and sediment control BMPs should be installed and inspected by the City prior to any land disturbing activities. The Contractor must provide a minimum 24 hour notice prior to inspection. 3. Additional grading detail (i.e. spot elevations, proposed contours, stairs) should be shown on the plan to adequately indicate proposed drainage patterns. To ensure runoff is not directed onto adjacent properties, swales along the side lot lines should be indicated to route runoff toward Navane Lane. Retaining wall may be necessary in some locations to accommodate the swales. 4. Driveway slopes are recommended not to exceed 10%maximum slopes. The applicant should consider revising proposed house/garage elevations to reduce the driveway slope from 12.6% to the recommended maximum. 5. A financial security of$2,000 from the Applicant is recommended for erosion control and engineering oversight. The financial security is intended to provide protection in the event that it becomes necessary for the City to install or maintain erosion and sediment control within the project area and covers the cost of vegetation re-establishment if the applicant is unable to follow through with the conditions of approval. 6. The applicant will be required to obtain Minnehaha Creek Watershed District(MCWD) approval and permitting far their Erosion Control Rule. A copy of any approvals or permits required should be submitted prior to any work. DESIGNING FOR A BETTER TOMORROW Bolton&Menk is an equal opportunity employer