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In BOLTON 69071MENK <br />Real People. Real Solutions. <br />Resol. No. <br />Exhibit B <br />LA18-000072 <br />September 20, 2018 <br />City of Orono <br />Attn: Melanie Curtis <br />2750 Kelley Parkway <br />Orono, MN 55356 <br />RE: Preliminary Plat Application LA18-000072 <br />2709 Walters Port Lane <br />Engineering Review#1 <br />Dear Melanie: <br />As requested, 1 have completed an engineering review of the documents s ibmitted for the above <br />referenced project. We offer the following observations, comments, and recommendations for your <br />consideration: <br />1. The applicant will be required to obtain Minnehaha Creek Watershed District(MCWD) <br />approval and permitting. A copy of any approvals or permits required should be submitted <br />prior to Final Plat approval. <br />2. The applicant will be required to obtain a General Consiruction Permit(NPDES)to discharge <br />stormwater associated with construction activity since more than 1 acre will be disturbed. A <br />copy of the coverage letter sho ld be submitted prior to any land disturbing activity. <br />3. Final Plans should include a Stormwater Pollution Prevention Plan meeting NPDES <br />requirements. <br />4. Insufficient data has been provided to review grading and erosion control. Existing contours <br />should indicate condition prior to any grading. Proposed spot elevations and contours should <br />be provided to adequately define grading and drainage after completion of improvements. <br />Perimeter erosion control measures should be indicated down gradient from all proposed work. <br />Where disturbance is proposed within 50' of the wetland or Lake Minnetonka, redundant <br />measures must be installed. Redundant measures must be installed a minimum 5' apart. <br />5. Perimeter erosion control measures should be installed by the Contractor and inspected by the <br />City prior to any work. A minim i n 24 hour notice must be provided prior to inspection. <br />6. Drainage and Utility Easements should be provided as follows: <br />a. Over all wetland buffers. <br />b. All swales and piping providing drainage for multiple properties. <br />c. 5' along all side lot lines. <br />d. 10' along all front lot lines. <br />7. Proposed improvements will significantly increase the amount of runoff directed toward the <br />structure at 2707 Walters Port Lane. Inlets, pipes, and swales should be provided as necessary <br />to restrict runoff directed toward the structure to that of existing conditions. <br />8. The common driveway shared by 2715 Pence Lane should be maintained as necessary to <br />provide an acceptable driving surface at all times. Currently, the portion of the driveway <br />between the culvert and the connection to 2715 Pence Lane is unacceptable. Class 5 aggregate <br />should be placed as necessary to provide an adequate driving surface. The aggregate should be <br />H:AORNOVC131154II6\-LA18-000072_2709 Wal[ers PorCLanc\2709WaI[ersPortlane_PrePlatRevicw-1 201fl-09-20.docx <br />Bp1Ypn&Menk is an eq al cpportunity employe.