04-15-2019 Planning Commission Packet

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Preliminary Plat Application LA19-000022 Willow Bay Sanctuary Page 2 treatment with this development in order to help meet their load reduction requirements. 4. Final Plans should include the following: a. Grading, Drainage, and Erosion Control Plan b. Street Construction Plan c. Landscape and Restoration Plan d. SWPPP meeting NPDES requirements 5. The applicant will be required to obtain Minnehaha Creek Watershed District(MCWD) approval and permitting. A copy of any approvals or permits required should be submitted prior to Final Plat approval. 6. The applicant will be required to obtain a General Construction Permit(NPDES)to discharge stormwater associated with construction activity since more than 1 acre will be disturbed. A copy of the permit should be submitted prior to any land disturbing activity. 7. The applicant will be required to submit a Maintenance Agreement for all stormwater management structures and facilities. The agreement should define maintenance responsibilities following completion of project, specify types and frequencies of inspection and maintenance activities, designate who will conduct inspection and maintenance activities, and outline reporting requirements. The agreement should list MCWD and the City of Orono as parties to the agreement. 8. Drainage and Utility Easements should be provided as follows: a. Over all stormwater management facilities used to meet regulatory requirements. b. Over all wetland and buffers. c. All swales and piping providing drainage for multiple properties. d. 5' along all side lot lines, unless adjacent to Development boundary. e. 10' along all front lot lines, rear lot lines, and adjacent to Development boundary. 9. A typical section should be provided for both the urban and rural portions of the proposed street. The rural section should provide a minimum 2' depth for the ditch per the City Standard Detail. The cul-de-sac must provide a minimum 40' radius of paved area. 10. More detail should be provided regarding the connections to Brown Road. If the curb and gutter from Brown Road are to direct runoff into the site, a spillway should be provided, and the Stormwater Management Plan should include this area. Road repair should be detailed and sequenced for connections to the sanitary sewer and watermain. 11. The sanitary sewer system proposed should be revised to remove the lift stations. A low- pressure system should be utilized, with each home having its own pump. 12. Service stubs should be indicated on the plan and installed with street and utility construction. 13. A fire hydrant should be added at the intersection with Brown Road. If you have any questions or comments,please contact me to discuss. Sincerely, Bolton &Menk, Inc. Robert E. Bean, Jr.,P.E. Water Resources Engineer CC: Adam Edwards, City of Orono H:\ORNO\C13117856\z_LA19-000022 Willow Bay Sanctuary\WillowBaySanctuary_PrePlatReview_2019-04-08.docx Bolton&Menk is an equal opportunity employer.