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SEP 11 2000 16:33 FR BflRR ENGINEERING <br />BARR <br />952 832 2601 TO 92494616 <br />Barr Engineering Company <br />4700 West 77th Street • Minneapolis. MN 55435-4803 <br />Phone: 952-832-2600 • Fax: 952-832-2601 <br />P.02/03 <br />Minneapolis, MN • HIbbing. MN • Duluth. MN • Ann Arbor. Ml • Jefferson City. MO <br />September 11,2< <br />Mr. Paul Weinberger <br />City of Ofono <br />2750 Kelley Parkway <br />PO Box 66 <br />Crystal Bay, MN 55323 <br />Ro: Brenahell Homes Development Proposal <br />Dear Mr. Weinberger. <br />At the rcguest of Mr. Gary Welsh and other concerned citizens of Orono, Barr Engin^g Co^any <br />meeting- Based on our latest review, we continue to have concerns regarding the steep slopes and <br />wetland losses. <br />Stetp SlopRS and Erosion Concerns <br />approximately one-sixth of the house pad on Lot 3 Ue within areas defined as steep slo^ <br />stMper than 12%). The current plans have not altered the drainage to ensure <br />does not cause erosion in the south ravine and on the steep slopes leading to Wildhurst Trail. <br />removal of numerous large maple trees which are currently providing stability m the ravme. The <br />steep slopes on LoU 2 and 3 are currently protected from erosion by: <br />1 The full tree and shrub canopy which intercepts rainfall, maintains a more permeable soil <br />structure and wicks away moisture from within the soUs by evapotransptration. and <br />2. The natural surface roughness and small depressional areas in the upstreaoi dri^age area slows <br />any runoff that does occur so runoff within the ravine is spread out and maintained at lower <br />rates. <br />As the city staff recommended at our meeting on September 6,2000, a conservation easeroent^ould <br />Sian 20 percent. Constructing the pond within a flatter area would eliminate smaller trees and create <br />less of an erosion concern. <br />r