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Bonestroo Z335 West Highway 3G ■ St.Paul, MN 55113 <br /> .� Rosene Office:651-63G-4600 • Fax: GS1-636-1311 <br /> Anderlil<& www.bonestroo.cbm <br /> Associ�tes <br /> Engineers&Architects <br /> April 7,2005 <br /> Ms.Janice Gundlach <br /> Planner ���°n y <br /> C1Ly OFOCO110 �� D��ags'!t� <br /> Post Office]3ox 66 �' � �'� <br /> Crystal Bay,MI�f 55323 �/J' �� <br /> _. _ _ _ . _ _. __ _ ._ .� � __ <br /> d <br /> Re: 1146 Wildhurst Trail �� ��'� � <br /> i'ile No. 139-OS-000 �V� <br /> Plal No.OS-3100 <br /> Dear Janice: <br /> We have reviewed the site plans forthe 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 conunents with regards to engineering matters: <br /> • There is an existing city owned sanitary force main located along the north side of the boat house.Removal of <br /> the boat house and the associated site grading to restore tl�e 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 o�cial should be on site when any removal or grading <br /> activity occurs near this sanitary sewer. <br /> • The city should verify tliat a drainage and utility easement exists over the sanitary sewer.If one does not exist <br /> the applicant should provide an easement 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.[t will be difficult 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 the side yards for swale construction should be submitted for review and approval. <br /> • A drainage area map and drainage calculations shouid be provided with the revised grading plan.The drainage <br /> calculations should include computations that verify the proposed swales wili contain runoff on the subject <br /> property for stonns up to and including the 100-year storm event. <br /> • ThP r?tainir.g wall shown lake ward fronl thP home appreaches 1 Q-feet in height.All retaining walls tl�at exr_eed <br /> 4-feet in height require a separate engineered design and detail submittal. <br /> • Erosion control tneasures should Ue installed, inspected and approved by the city prior to any�vork on site. <br /> If you have any questions please call me at(651)604-4863. <br /> Yours very truly, <br /> BON�STROO,ROSEN�,ANDE1tL[K&ASSOCIATES,INC. <br /> __------- <br /> ��� � <br /> Tom Kellogg <br /> Cc: Greg Gappa,City of Orono <br /> ■ St. Paul, St. Cloud, Rochester, Willmai`, MN ■ Mifwaul<ee, WI • Chicago, IL <br /> Affirma[ive Action/Equal Opportunity Employer and Empioyee Owned <br />