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Resol. 7490 <br /> Exhibit C BOLTON <br /> 2E LA24-000030 t1Suite LUU <br /> Chask <br /> & M E N K a, MN 55318-1172 <br /> Real People.Real Solutions. Ph: (952) 448-8838 <br /> Fax: (952) 448-8805 <br /> Bolton-Menk.com <br /> June 19,2024 <br /> City of Orono <br /> Attn:Adam Edwards <br /> 2750 Kelley Parkway <br /> Orono,MN 55356 <br /> RE: Preliminary Plat Application <br /> Honey Hill <br /> Engineering Review#2 <br /> Dear Adam: <br /> As requested,I have completed an engineering review of the Stormwater Management Plan and Master <br /> Grading Plan submitted for the above referenced project. Following are my comments for your <br /> consideration: <br /> 1. The applicant is proposing four infiltration basins to meet stormwater runoff management <br /> requirements. The following should be considered regarding the proposed system: <br /> a. Proposed infiltration basins provide 1.2' depth for Basin 1, 1.5' for Basins 2 and 3,and 3.0' <br /> for Basin 4. The NPDES permit requires a drawdown of surface water within 48 hours for <br /> infiltration basins.Based on site soils, a maximum depth of 0.8' is allowable to meet this <br /> requirement. Basins must be revised to provide the maximum allowable depth accordingly <br /> or the design should be revised to include draintile and be considered filtration. <br /> b. A minimum 8' wide access bench must be provided around all basins to allow for future <br /> maintenance. <br /> c. A minimum 1' separation should be provided between the surface overflows and top of <br /> adjacent berms. <br /> d. Proposed basins should be installed with street construction to ensure they are constructed <br /> as intended. <br /> e. Proposed basins should be vegetated with a native stormwater seed mix. <br /> 2. Consideration should be given to installing RCP for the 12"culvert proposed at approximately <br /> station 3+11 in lieu of CMP to provide a longer lifecycle material. <br /> If you have any questions or comments,please contact me to discuss. <br /> Sincerely, <br /> Bolton & Menk, Inc. <br /> 6-4 <br /> Robert E. Bean,Jr.,P.E. <br /> Senior Water Resources Project Manager <br /> H:\ORNO\_Surface Water Management\MS4 Administration\MCM-5\2_Site Plan Reviews\Honey Hill\Honey Hill_PrePlatReview-2 2024-06-19.docx <br /> Bolton&Menk is an equal opportunity employer. <br />