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NCs 2638 Shadow Lane, Suite 200 • Chaska, MN 55318-1172 Phone (952) 448-8838 • Fax (952) 448-8805 www.bolton-menk.com September 30, 2016 City of Orono Attn: Mike Gaffron 2750 Kelley Parkway Orono, MN 55356 RE: Final Plat Application 16-3867 Tanager Estates Engineering Review #1 Dear Mike: As requested, we have completed an engineering review of the documents submitted for the above referenced project. We offer the following comments for your consideration: General Council Exhibit G 1.1. Stormwater management for the proposed site meets City requirements. Proposed peak runoff rates will be restricted to less than existing peak runoff rates, and volume control will be provided in accordance with NPDES requirements. 1.2. A final estimated cost of proposed improvements, matching approved plans, must be submitted in order to determine the total Letter of Credit (LOC) amount. The LOC must be written to 150% of cost of improvements and submitted prior to any land disturbing activities. Estimated costs should include grading, erosion control, utilities, street construction, vegetation management, buffer establishment, temporary stabilization, and final stabilization. 1.3. The minimum escrow of $10,000 should be submitted prior to any land disturbing activities to provide for erosion control and engineering oversight. 1.4. Retaining walls are proposed to be just under 4' in height. However, if wall heights are increased in field to over 4' in height to match unknown site conditions, walls must be analyzed by a licensed Professional Engineer, and an approval letter of wall design and construction must be provided. 1.5. Due to close proximity to the road, fence should be provided along the proposed retaining walls to provide some measure of safety for pedestrian traffic. 1.6. Clear drive lanes must be maintained on Heritage Drive during construction. The Contractor will have to exercise care during mobilization of equipment to not block traffic, and parking for construction workers should be restricted to on-site only. The Contractor should submit a Traffic Control Pian prior to any work. Plan must account for all items listed in Condition 8 of the Preliminary Plat approval resolution in order to define acceptable construction activity and traffic control on Heritage Lane. 1.7. A Final Landscape Plan should be submitted as part of the Final Plat process. The plan should indicate various items with a legend and hatching to ensure areas of management and revegetation are adequately accounted for. The plan should include the following within the area of proposed improvements: a. Tree preservation and removal limits, including tree protection fencing b. Tree replacement locations and species schedule c. Invasive species removal d. Wetland buffer establishment e. Vegetation establishment for disturbed areas 1.8. The Lot Declarations should take into account the following items: