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r>rm <br />‘0/ <br />mi <br />PSE <br />,V^.v' <br />if I Bonestroo <br />MLM Rosene <br />•55 Anderlik& <br />^1 Associates <br />Engineers & Architects <br />Ofto G. Bonwwxx PE <br />Robert W toiene. PE * <br />Joseph C Andcrt*. PE <br />Marvm L. Sorvaii. PE. <br />Richard E Turner. PE <br />Oenn R Coo*l PE <br />Thomas E No^i PE <br />Robert G ScnunchL PE <br />Susan M. Ebedm. C PA. <br />•Seniof ConsuHant <br />Howard A SantorU PE <br />Ktfitn A Gordoa P5. <br />Rooert R PWterte. PE. <br />Richard W Foster. PE. <br />David O ijoskota PE <br />Roocn C Russek. aja <br />Jerry A. Boudon. P£. <br />Mark A Hanson. PE <br />Mchad T Raucmanrt PE. <br />TM K. F«W. PE <br />Thomas R AnOenon. A i A <br />Donald C Bu/gsfOL PE <br />Thomas E Angui PE. <br />Gary F. Rylandcr. PE <br />Ismael Mamncz- PE <br />Mchae P Rau. PE <br />Agnes M. Ring. AiC P <br />Thomas W Peterson. PE <br />Michael C Lynch. PE <br />James R Mivmd. PE <br />Jerry 0 Permch PE <br />Kenrseth P Anderson. PE <br />Mark R RbRs. PE <br />Mark A Seip. PE <br />Cary W Monert. PE <br />Daniel J. Edgertca PE <br />PhUp i Casv^. PE <br />Mark O VMaka PE. <br />Miles a Jensen, PE. <br />L Ph«p Gravel ML PE. <br />ICaren L W«emefi. PE. <br />F Todd Foster. PE. <br />Keen R vapa PE <br />Shawn D Gusahca PE <br />Ceclio Okvief. PE. <br />Charles A Enckson <br />Leo M Pavi^y <br />Harlan M Olson <br />James F Engetsardt <br />A V <br />May 8, 1992 .. •• •. »■ .1 <br />p : 5| <br />fc.-. ■ <br />Ms. Jeanne A. Mabusth <br />BuDding & Zoning Administrator <br />City of Orono <br />Box 66 <br />Crystal Bay, MN 55323 <br />19'ii <br />- - * <br />Re: Camp Teko Property <br />Conditional Use Permit Appl. #1733 <br />Our File No. 139-1733 <br />Dear Jeanne: <br />We have reviewed the application and supporting documents submitted for a conditional use <br />permit on the Camp Teko property. There are several significant engineering issues related <br />to the constructability of the improvements. <br />Directly to the north of the existing steps and proposed start of the nprap is a ditch block. <br />The ditch block directs the runoff into a PVC culvert which outlets m the ditc <br />approximately 200 feet to the south, the culvert exists with little or no cover and will create <br />a problem when constructing the proposed ditch. Also, the pathway leading from the mam <br />trail to the existing steps crosses the ditch at grade and is in poor condition. T^e existing <br />culvert should be removed and a portion should be salvaged to be reinstalled at the <br />proposed ditch grade. The culvert could be used at the ditch block and at the pathway. <br />TOs wav the pathwav could be buUt up above the ditch bottom and impriwed with gravel. <br />The proposed Class II riprap may not be suitable for the high velocities expected along the <br />ditch bottom. Also, the 6" average size is too easily displaced by the numer^ pedestnans <br />in the area. We recommend Class III riprap which has a 9" average size, m filter fabnc <br />should be a non-woven fabric in accordance with Mn/DOT specification 3733, type 1 . <br />The area identified as the last 120 feet of drainage ditch is of the greatest concern. The <br />main trail and ditch are confined in a very small corridor between a large oak tree, a picnic <br />canopy and the steep bank to the west. If this trail is to be used for any purpose other than <br />pedestrian traffic, it should be widened, realigned, and improved. It appears as though it <br />iT presently used for vehicle access to the lake. The steep bank to the <br />approximate slope of 1:1 (horizontal to vertical). The minimum acceptable slope, with fabnc <br />and riprap, b 3:1. To construct this slope, the trail must be removed, or the bank must be <br />excavated significantly, resulting in the loss of several of the large oak trees m the area. <br />■ Jij