04-16-2012 Planning Commission Packet

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� , PC Exhibit F � . = BO!_TON � M �N K , .I NC� . , Consulting Engineers &�Sunreyors '� 2638 Shadow Lane,Suite 200•Chaska, MN 55318-1172 . Phone(952)448-8838• Fax(952)448-8805 www.bolton-menk.com April 11,2012 City of Orono Attn: Mike Gaffron . PO Box 66 Orono,MN 55323 RE: Preliminary Plat Application 11-3534 Arthur J.Nelson Estate Dear Mr. Gaffron: As requested,we reviewed the Preliminary Plat submittal package for the above referenced project. Our current review is based on the following submittal items: • Certificate of Survey and Preliminary Plat prepared by Gronberg&Associates;dated 3/21/2012 • Conservation Design Report prepared by Svoboda Ecological Resources; dated 3/23/2012 � Drainage Calculations prepared by Gronberg&Associates;dated 3/13/2012 � Drainage Area Maps prepared by Gronberg&Associates;dated 3/21/2012 We offer the following observations,comments,and recommendations for your consideration: l. The applicant will be required to obtain Minnehaha Creek Watershed District(MCWD) approval of any stormwater management,erosion control,and wetland mitigation required by the district. A copy of any approvals required should be submitted prior to Final Plat approval. 2. Conservation and Flowage Easements are required over the delineated wetlands and buffers. 3. Per the Conservation Design Report, a Conservation Easement is required over the trees along the north property line. 4. Septic reports indicating suitable primary and alternate sites for on-site sewage treatment systems , must be submitted for review and approval. 5. Proposed well locations should be shown on the Final Plans. Wells must be setback 3 feet minimum from structures and 50 feet minimum from septic systems. 6. The existing barn should be removed prior to Final Plat approval. 7. A MNRAM Assessment for Wetland C must be submitted in order to apply the appropriate classification and resulting buffer width. 8. A Vegetative Management and Landscape Plan for the buffers must be submitted prior to Final Plat approval. This Plan should include methods for controlling buckthorn,reed canary grass,thistle,turf grass and other invasive species within the buffer,methods for establishing native vegetation in the buffer for azeas of existing turf grass,and species proposed to be seeded or planted. 9.� Plans designed by a structural engineer must be submitted for review and approval for any retaining walls 4 feet or greater in height prior to Final Plat approval.