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Bonestroo Z335 West Highway 3G • St. Paul, MN 55113 <br /> Rosene Office: G51-G3G-4G00 ■ Fax: G51-63G-1311 <br /> - Anderlil<& www.bonestroo.com <br /> Associ�tes <br /> Engineers&Architects <br /> Apri17,2005 <br /> Ms.Janice Gundlach <br /> Planner °��`' <br /> City of Orono ,,9� �'������, <br /> Post Office Box 66 �'i � �" <br /> Crystal Bay,MN 55323 �'/r�',�� ���aS <br /> Re: 1146 Wildhurst Trail �i� <br /> File No. 139-OS-000 p�� <br /> Plat No.OS-3100 <br /> Dear Janice: <br /> We have reviewed the site plans for the proposed improvements to 1146 Wildhurst Trail.The site improvements include <br /> the removal of an existing house and boat house,the construction of a new house and detached garage along with the <br /> associated site grading.We have the following comments with regards to engineering matters: <br /> • There is an existing city owned sanitary force main located along the north side of the boat liouse.Removal of <br /> the boat house and the associated site grading to restore the slope could impact the existing sanitary sewer.The <br /> sewer should be shown on the plans and a note included with the plans stating that this sewer must be protected <br /> during any construction activities.A city public works official should be on site when any removal or grading <br /> activity occurs near this sanitary sewer. <br /> • The city should verify that a drainage and utility easement exists over the sanitary sewer.If one does not exist <br /> the applicant should provide an easeinent 20-feet wide centered over the sewer. <br /> • The grading plan shows proposed swales between the house and the side lot lines.Construction of the swale <br /> along the east lot line is proposed within a 5-foot wide corridor between the proposed retaining walls and the <br /> east lot line.It will be di�cult if not impossible to construct this swale within the 5-foot corridor provided.We <br /> recommend that at least 10-feet be provided for swale construction.A revised grading plan showing at least a <br /> 10-foot wide clear area in tbe side yards for swale construction should be submitted for review and approval. <br /> • A drainage area map and drainage calculations should be provided with the revised grading plan.The drainage <br /> calculations should include computations that verify the proposed swales will contain runoff on the suUject <br /> property for stonns up to and including the 100-year storm event. <br /> • The rPtaining wall shown lake ward frozn Yl�e ll�rme appreaches ?Q-fePt in height.All retaining walls that exr_eed <br /> 4-feet in height require a separate engineered design and detail submittal. <br /> • Erosion control measures should be instalied, inspected and approved by the city prior to any work on site. <br /> If you 1�ave any questions please call me at(G51)604-4863. <br /> Yours very truly, <br /> BON�STROO,ROSENE,ANDERLIK&ASSOCIAT�S,fNC. <br /> ___-----"' <br /> ��7'� ; <br /> Tom Kellogg <br /> Cc: Greg Gappa,City of Orono <br /> • St. Paul, St. Cloud, Rochester, Willmar, MN • Milwaul<ee, WI • Chicago, IL <br /> Affirmative Action/Equal Opportunity Employer and Emplayee Owned <br />