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1 1 � , <br /> � • = BOLTON 8� M �N K , I NC� <br /> . Consulting Engineers 8c Surveyors <br /> '� 2638 Shadow Lane,Suite 200•Chaska, MN 5531&1172 <br /> Phone(952)448-8838•Fax(952)448-8805 <br /> www.bolton-menk.com <br /> December 2,2015 <br /> City of Orono <br /> Attn: Adam Edwards <br /> 2750 Kelley Parkway <br /> Orono,MN 55356 <br /> RE: Application 2015-01451 <br /> Spring Hill Golf Club Practice Facility <br /> Engineering Review#1 <br /> Dear Adam: <br /> As requested,we have completed an engineering review of the documents submitted for the above <br /> referenced project. We offer the following comments for your consideration: <br /> 1.1. Drainage calculations and corresponding drainage azea map must be submitted to verify stormwater <br /> management system sizing. <br /> 1.2. Perimeter erosion control measures should be installed by the Contractor and inspected by the City <br /> prior to any work. Contractor must provide minimum 24 hour notice prior to inspection. <br /> 1.3. The applicant should consider using manufactured inlet protection devices in lieu of the proposed rock <br /> sediment traps. Rock sediment traps are more difficult to maintain and can block flow when clogged. <br /> 1.4. Siltfence or biologs should be installed upstream on the south side of the proposed basin after rough <br /> grading of basin is complete to prevent sedimentation of area. Siltfence or biologs could be removed <br /> after upstream area is permanently stabilized. <br /> 1.5. The storm sewer inlet to the basin should be revised to be located at or above the high water level to <br /> ensure the PVC pipe end does not float due to being submerged during rain events. <br /> 1.6. The infiltration media should be revised to consist of a minimum 70%granular material to reduce <br /> chance of clogging due to organic material. <br /> 1.7. The applicant may be required to obtain Minnehaha Creek Watershed District(MCWD)approval and <br /> permitting for their Erosion Control and Stormwater Management Rules. A copy of any approvals or <br /> pern►its required should be submitted prior to final approval. <br /> 1.8. The applicant may be required to obtain Hennepin County approval and permitting for work within <br /> County Right-of-Way. A copy of any approvals or permits required should be submitted prior to final <br /> approval. <br /> 1.9. The applicant will be required to submit a Maintenance Agreement for all stormwater management <br /> structures and facilities. The ageement should define maintenance responsibilities following <br /> completion of project, specify types and frequencies of inspection and maintenance activities,and <br /> designate who will conduct inspection and maintenance activities. <br /> Please let me know if you have any questions or need additional information. <br /> Sincerely, <br /> BOLTON&MENK,INC. <br /> S8C4��J�{J"�i i`�CA.v� <br /> 1/ <br /> Robert E.Bean,Jr.,P.E. <br /> Water Resources Engineer <br />