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LN K Real People. Real Solutions. October 5, 2016 City of Orono Attn: Mike Gaffron 2750 Kelley Parkway Orono, MN 55356 RE: Final Plat Application 16-3860 Kintyre Preserve Engineering Review #2 Dear Mike: 2638 Shadow Lane Suite 200 Chaska, MN 55318-1172 Ph: 19521448-8838 Fax: (9521448-8805 Bolton-Menk.com As requested, we have completed an engineering review of the documents submitted for the above referenced project. We offer the following observations, comments, and recommendations for your consideration: Council Exhibit D I. 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. 2. The Engineer's Estimate indicates proposed improvements will cost $325,628.00. Therefore, a Letter of Credit totaling 150% of proposed improvement costs ($488,442.00) should be submitted prior to any land disturbing activities. 3. The minimum escrow of $10,000 should be submitted prior to any land disturbing activities to provide for erosion control and engineering oversight. 4. Clear drive lanes must be maintained on existing Kintyre Lane 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 Plan prior to any work. 5. Record drawings must be submitted upon completion of the project. If the proposed permanent pond is to be used as a temporary sediment basin during construction, as -built survey shots on pond must be obtained after construction sediment is removed and side slopes re -dressed. 6. Horizontal curves for streets with a design speed of 30 mph must provide a minimum 275' radius. The curve located at approximately station 5+00 does not meet the minimum requirement. The Plat should either be revised or a variance would be required. 7. The new driveway to Lot 5 should be installed at the same time Kintyre Lane is constructed, and the existing driveway should be removed. The new driveway location should be indicated on the plans. 8. Removal items not depicted on the other plans should be noted for demolition on the Site Plan. These items include the construction access driveway and the portion of driveway removed that use to serve Lot 5. 9. The grading necessary to remove the existing driveway to Lot 5 should be indicated on the Grading Plan. Any existing culvert present should be removed, and the drainage way should be restored to pre -development conditions. 10. Notes detailing procedure and schedule for connection of new street to existing Kintyre Lane should be included with plan. Bituminous pavement should be saw -cut for clean match lines. Enough existing curb and gutter should be removed to install 15' radii to the new alignment. Final extent of H:\0RN0\C13109539\15-3763_200 Stubbs Bay Asad\Final Plat\Reviem\Kin ymPmse a PinelPlaS 2016-10.05.doc Bolton $ Menk is an