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^ i Bonestroo <br />BOElm Rosene <br />Anderlik & <br />Associates <br />( /!•». t • '‘f <br />rt • <br />' . »*|^» I » f*» <br />V1«* I V i<v^ <• f t <br />V • ii.vt * I ! n»^t t‘l <br />« . r- wi if I ##■* ''T <br />»'*l^ .%f% 17 <br />11 •» h| '*1 <br />V I ( r*V»i f »• A <br />ffcv.'.^nj A VlA’C“3 <br />lr\”* * .'-‘#“'>1 <br />'ju f«j <br />I' »w-i o Pt <br />' iiour^ A 'A <br />in*v A Mi.tvtkM' <br />Mj't A Pf <br />V*i'.ir » Pf <br />!r»i Ik Iriu PI <br />h»**H^* tt Ai'-jAfurfi AiA <br />Kif>^i NU'ltiP/ Pp <br />V<M4f K f<u l-l <br />P-.V ; ^pAr |'» <br />W A »C ^ <br />Tr^ v.*-* f| <br />C l<iiM nt. <br />9 MjMikJ >»f <br />rc <br />p A/v/-^UJ*! f# <br />ffcti i*r <br />M.*.n A S:ti <br />Cjiy W PI <br />O.Ki.N I ^rv^PfriKi 1*1 <br />A.ijr» ffYl kr^^<?r <br />V^i'i *1 PI <br />*•* V , || V I' /••« f*| <br />I i*** m 1*1 <br />I f*| <br />(*.ii« I: »'ivii!»► <br />^ f»Xkl ft/sjr* l‘f <br />1C I'C <br />I f*f <br />VuiVWM |» t <br />Vi C? v^» »*f <br />( »M* r% A f ,« <br />I rt ' M <br />IU'U»M Vl ( ktiifi <br />» t *u,nf'jnn <br />M <br />Engineers & Architects <br />August 4, 1993 <br />Ms. Jeanne A. Mabusth, <br />Building and Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, Minnesota 55323 <br />Re: Bill Cornelius Drainage <br />File No. 139-1841 <br />Dear Jeanne, <br />We have reviewed the drainage for the proposed loop driveway construction submitted <br />by Stephen Longman Construction for the Cornelius property on the east side of <br />Tonkawa Road. The driveway is proposed to be constructed along the alignment of an <br />existing access that encroaches into the shoreline setback. If the alignment is approved <br />by the City Council, we recommend that it be constructed to direct the surface runoff to <br />the southerly side of the driveway. To accomplish this drainage, we recommend that the <br />driveway be superelevated with a 3 percent cross slope along the shoreline setback. A <br />four inch, shoe formed, integral bituminous berm curb should be constructed along the <br />southerly side of the driveway. At the low point in the driveway, a small bituminous <br />spillway should be constn:.cted to minimize erosion. A small detention area should be <br />reserved here to collect the site drainage. A 12 inch culvert with aprons should be <br />constructed under the driveway for an outlet to the west. We recommend a small <br />wooden ba.ffle weir with class 1 riprap be constructed at the upstream end of the culvert. <br />The baffle weir will trap floatable debris before reaching the culvert. The debris will <br />need to be removed regularly for the baffle weir to function properly. The existing <br />culvert should b.*? extended beyond tlie proposed fill to outlet into the detention area. <br />Silt fence should be installed along the shoreline for erosion control. The entire <br />disturbed area should be seeded or sodded. <br />We have reviewed possibility of constructing the driveway further south of the proposed <br />location. Tliis alignment requires .significant tree loss and excavation. We would not <br />recommend this alignment from an engineering standpoint. <br />We recommend that the driveway alignment be shifted as far south as possible. If the <br />most westerly 16 inch Maple must be saved, the alignment shift should begin <br />immediately past the tree. The driveway wiU need to be raised 2 to 3 feet at the low