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- Z335 West Highway 3G • St. Paul, MN 55113 � " � <br /> Bonestroo <br /> � Rosene Office: 651-G36-4G00 • Fax: G51-G3G-1311 �"°°° <br /> � Anderlil<& www.bonestroo.com <br /> Associ�tes <br /> Engineers&Architects '����8���, <br /> s��' o � zoo� <br /> September 6, 2005 ��r� �F C1hOfV(} <br /> Mr. Michael Gaffron <br /> Planning Director <br /> City of Orono <br /> Post Office Box 66 <br /> Crystal Bay, Minnesota 55323 <br /> Re: 3500 Watertown Road Subdivision <br /> Filti�TO, Q00?39-OSOQO-0 <br /> Plat No. OS-3152 . <br /> Dear Mike, <br /> We have reviewed t11e plans dated 8-17-OS for the proposed 6-lot subdivision located at 3500 <br /> Watertown Road. The proposed improvements include grading, roadway construction and stonli <br /> sewer improvements to serve the site. We have the following comments with regards to enguleering <br /> matters: <br /> • The proposed grading plan shows areas on Lots 2, 3, and 4, Block 2 where slopes are as <br /> stee�as 1:1.The grading plan should be revised so that proposed slopes do not exceed 3:1. <br /> • The grading plans show proposed retaining walls up to 10-feet in height within the right-of- <br /> way and on 3 of the 61ots. We reconuliend that the plans be revised so the walls are shown <br /> outside of the right-of-way. All walls that exceed 4-feet in height require a separate <br /> engineered design and detail subnuttal for review and approval. <br /> • The plans should be revised to minimize wetland impacts; this may require acquiring <br /> additional property to the west to revise the road alignment.At a niinullum,the plans should <br /> identify the location of the necessary wetland impact mitigation. <br /> • Final grading plans should incorporate sonle type of best nzanagement practice to treat the <br /> storm water that is not routed to the proposed poud. ' <br /> � Storm sewer design (plan and profile views) and calculations should be submitted for <br /> review and approval. <br /> • The plans should pr.ovide drainage aiid utility easements over the proposed ston2i sewer, <br /> pond and existing wetland. In addition, the plans should identify an access from the <br /> roadway to the pond for maintenance purposes along with the.necessary access easement. <br /> • The �lans indicate grading will be necessary onto the adjacent property,to the west to <br /> construct the road;this will require temporary construction easeiiZents from the neighboring <br /> property owner. <br /> ,:.• The proposed intersection of Mackulnon Road and Watertown Road may present sigllt <br /> distauce-issues.A sigtit distance analysis of this proposed i.ntersection should be submitted <br /> for review. <br /> • The drainage and ponding calculation submitted are being reviewed by our Water aud <br /> Natural Resources Group; coniments will be forwarded to you under separate cover. <br /> St. Paul, St. Cloud, Rochester, MN • Milwaukee, WI • Chicago, IL <br /> AFf(rmative Action/Equal Opportunity Emp�oyer and Employee Owned <br />